java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:37:58,989 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:37:58,991 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:37:59,003 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:37:59,004 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:37:59,005 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:37:59,006 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:37:59,008 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:37:59,009 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:37:59,010 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:37:59,011 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:37:59,012 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:37:59,013 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:37:59,014 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:37:59,015 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:37:59,016 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:37:59,017 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:37:59,022 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:37:59,024 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:37:59,026 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:37:59,027 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:37:59,031 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:37:59,035 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:37:59,035 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:37:59,037 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:37:59,038 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:37:59,039 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:37:59,040 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:37:59,041 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:37:59,046 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:37:59,046 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:37:59,049 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:37:59,054 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:37:59,083 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:37:59,083 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:37:59,084 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:37:59,084 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:37:59,084 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:37:59,085 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:37:59,085 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:37:59,085 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:37:59,086 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:37:59,086 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:37:59,086 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:37:59,086 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:37:59,086 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:37:59,086 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:37:59,087 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:37:59,087 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:37:59,089 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:37:59,089 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:37:59,089 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:37:59,089 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:37:59,090 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:37:59,090 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:37:59,090 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:37:59,090 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:37:59,090 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:37:59,091 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:37:59,091 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:37:59,091 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:37:59,091 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:37:59,092 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:37:59,092 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:37:59,092 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:37:59,092 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:37:59,092 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:37:59,093 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:37:59,093 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:37:59,147 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:37:59,161 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:37:59,166 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:37:59,168 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:37:59,169 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:37:59,170 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-10-24 12:37:59,239 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c5945bc9f/b4b7df7671e146ffaee57ef7086be4fd/FLAGacf81a384 [2018-10-24 12:37:59,714 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:37:59,715 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-10-24 12:37:59,720 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c5945bc9f/b4b7df7671e146ffaee57ef7086be4fd/FLAGacf81a384 [2018-10-24 12:37:59,735 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c5945bc9f/b4b7df7671e146ffaee57ef7086be4fd [2018-10-24 12:37:59,746 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:37:59,747 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:37:59,748 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:37:59,748 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:37:59,752 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:37:59,753 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:37:59" (1/1) ... [2018-10-24 12:37:59,756 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@500e87a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:37:59, skipping insertion in model container [2018-10-24 12:37:59,756 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:37:59" (1/1) ... [2018-10-24 12:37:59,766 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:37:59,785 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:37:59,958 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:37:59,965 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:37:59,986 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:38:00,005 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:38:00,005 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00 WrapperNode [2018-10-24 12:38:00,006 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:38:00,007 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:38:00,007 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:38:00,007 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:38:00,018 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,025 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,032 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:38:00,032 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:38:00,033 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:38:00,033 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:38:00,046 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,047 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,047 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,048 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,053 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,060 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,061 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (1/1) ... [2018-10-24 12:38:00,063 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:38:00,064 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:38:00,064 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:38:00,064 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:38:00,065 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (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 12:38:00,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:38:00,139 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:38:00,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:38:00,140 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:38:00,140 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:38:00,140 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:38:00,140 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:38:00,140 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:38:00,457 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:38:00,458 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:38:00 BoogieIcfgContainer [2018-10-24 12:38:00,458 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:38:00,459 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:38:00,459 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:38:00,462 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:38:00,463 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:37:59" (1/3) ... [2018-10-24 12:38:00,464 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6725cc28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:38:00, skipping insertion in model container [2018-10-24 12:38:00,464 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:38:00" (2/3) ... [2018-10-24 12:38:00,464 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6725cc28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:38:00, skipping insertion in model container [2018-10-24 12:38:00,464 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:38:00" (3/3) ... [2018-10-24 12:38:00,466 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k_true-unreach-call_true-termination.i [2018-10-24 12:38:00,478 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:38:00,486 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:38:00,512 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:38:00,575 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:38:00,575 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:38:00,576 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:38:00,576 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:38:00,576 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:38:00,576 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:38:00,576 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:38:00,577 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:38:00,598 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-24 12:38:00,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:38:00,606 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:00,608 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:00,610 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:00,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:00,618 INFO L82 PathProgramCache]: Analyzing trace with hash 1152414567, now seen corresponding path program 1 times [2018-10-24 12:38:00,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:00,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:00,686 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:00,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:00,686 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:00,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:00,762 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 12:38:00,764 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:38:00,765 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:38:00,765 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:00,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:38:00,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:38:00,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:38:00,784 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-24 12:38:00,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:00,806 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-24 12:38:00,806 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:38:00,808 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-10-24 12:38:00,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:00,817 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:38:00,818 INFO L226 Difference]: Without dead ends: 14 [2018-10-24 12:38:00,822 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 12:38:00,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-24 12:38:00,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-24 12:38:00,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-24 12:38:00,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-24 12:38:00,858 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-24 12:38:00,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:00,859 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-24 12:38:00,859 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:38:00,859 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-24 12:38:00,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-24 12:38:00,860 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:00,860 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:00,861 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:00,861 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:00,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1083883255, now seen corresponding path program 1 times [2018-10-24 12:38:00,862 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:00,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:00,866 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:00,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:00,866 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:00,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:01,122 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 12:38:01,122 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:38:01,123 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-24 12:38:01,123 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:38:01,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:38:01,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:38:01,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:38:01,127 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-10-24 12:38:01,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:01,250 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-24 12:38:01,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:38:01,252 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2018-10-24 12:38:01,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:01,253 INFO L225 Difference]: With dead ends: 21 [2018-10-24 12:38:01,253 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:38:01,255 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:38:01,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:38:01,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 12:38:01,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 12:38:01,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-24 12:38:01,261 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2018-10-24 12:38:01,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:01,262 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-24 12:38:01,262 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:38:01,262 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-24 12:38:01,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:38:01,262 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:01,263 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:01,263 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:01,263 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:01,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1128913667, now seen corresponding path program 1 times [2018-10-24 12:38:01,264 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:01,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:01,265 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:01,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:01,265 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:01,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:01,375 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 12:38:01,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:01,376 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:01,379 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-10-24 12:38:01,381 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-10-24 12:38:01,417 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:38:01,418 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:38:01,574 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:38:01,576 INFO L272 AbstractInterpreter]: Visited 14 different actions 30 times. Merged at 4 different actions 8 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-24 12:38:01,589 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:01,590 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:38:01,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:01,591 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 12:38:01,602 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:01,603 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:01,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:01,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:01,951 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 12:38:01,951 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:02,095 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 12:38:02,119 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:02,120 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:38:02,120 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:02,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:38:02,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:38:02,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:38:02,122 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-10-24 12:38:02,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:02,277 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-24 12:38:02,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:38:02,278 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-24 12:38:02,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:02,279 INFO L225 Difference]: With dead ends: 30 [2018-10-24 12:38:02,279 INFO L226 Difference]: Without dead ends: 25 [2018-10-24 12:38:02,280 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:38:02,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-24 12:38:02,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-24 12:38:02,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-24 12:38:02,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-24 12:38:02,286 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 15 [2018-10-24 12:38:02,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:02,286 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-24 12:38:02,287 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:38:02,287 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-24 12:38:02,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-24 12:38:02,288 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:02,288 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:02,288 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:02,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:02,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1437681655, now seen corresponding path program 2 times [2018-10-24 12:38:02,289 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:02,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,290 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:02,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:02,290 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:02,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:02,549 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 12:38:02,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:02,550 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:02,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:02,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:02,551 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 12:38:02,565 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:02,565 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:02,586 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:38:02,586 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:02,588 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:02,734 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 12:38:02,735 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:03,103 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 12:38:03,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:03,138 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:38:03,138 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:03,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:38:03,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:38:03,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:38:03,142 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2018-10-24 12:38:03,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:03,697 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-10-24 12:38:03,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:38:03,698 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-10-24 12:38:03,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:03,699 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:38:03,699 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:38:03,699 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=127, Invalid=253, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:38:03,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:38:03,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-24 12:38:03,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-24 12:38:03,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-24 12:38:03,707 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 24 [2018-10-24 12:38:03,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:03,707 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-24 12:38:03,707 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:38:03,707 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-24 12:38:03,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-24 12:38:03,708 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:03,709 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:03,709 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:03,709 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:03,709 INFO L82 PathProgramCache]: Analyzing trace with hash -656200317, now seen corresponding path program 3 times [2018-10-24 12:38:03,709 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:03,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:03,710 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:03,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:03,711 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:03,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:03,903 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 12:38:03,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:03,904 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:03,904 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:03,904 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:03,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:03,905 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 12:38:03,919 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:03,920 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:03,941 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:03,942 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:03,946 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:04,071 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 12:38:04,072 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:04,399 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 12:38:04,431 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:04,432 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:38:04,432 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:04,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:38:04,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:38:04,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:38:04,434 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 13 states. [2018-10-24 12:38:04,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:04,825 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2018-10-24 12:38:04,832 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:38:04,832 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-10-24 12:38:04,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:04,833 INFO L225 Difference]: With dead ends: 48 [2018-10-24 12:38:04,834 INFO L226 Difference]: Without dead ends: 43 [2018-10-24 12:38:04,835 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=277, Invalid=535, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:38:04,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-24 12:38:04,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-10-24 12:38:04,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-24 12:38:04,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-10-24 12:38:04,845 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 33 [2018-10-24 12:38:04,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:04,846 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-10-24 12:38:04,846 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:38:04,847 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-10-24 12:38:04,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-24 12:38:04,854 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:04,855 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:04,855 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:04,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:04,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1490238089, now seen corresponding path program 4 times [2018-10-24 12:38:04,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:04,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:04,860 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:04,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:04,860 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:04,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:05,484 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 12:38:05,484 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:05,484 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:05,485 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:05,485 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:05,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:05,485 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 12:38:05,493 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:05,493 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:05,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:05,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:05,618 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 12:38:05,619 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:06,058 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 12:38:06,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:06,080 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:38:06,080 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:06,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:38:06,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:38:06,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=441, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:38:06,082 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 16 states. [2018-10-24 12:38:06,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:06,604 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-10-24 12:38:06,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:38:06,605 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2018-10-24 12:38:06,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:06,606 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:38:06,606 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 12:38:06,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:38:06,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 12:38:06,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-24 12:38:06,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-24 12:38:06,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-24 12:38:06,617 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 42 [2018-10-24 12:38:06,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:06,618 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-24 12:38:06,618 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:38:06,618 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-24 12:38:06,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-24 12:38:06,620 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:06,620 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:06,620 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:06,620 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:06,621 INFO L82 PathProgramCache]: Analyzing trace with hash 45932547, now seen corresponding path program 5 times [2018-10-24 12:38:06,621 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:06,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:06,622 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:06,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:06,622 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:06,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:07,500 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 12:38:07,501 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:07,501 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:07,501 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:07,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:07,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:07,502 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 12:38:07,510 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:07,511 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:07,545 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-10-24 12:38:07,545 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:07,548 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:07,893 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 12:38:07,893 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:08,429 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 12:38:08,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:08,451 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:38:08,451 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:08,452 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:38:08,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:38:08,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=666, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:38:08,453 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 19 states. [2018-10-24 12:38:09,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:09,176 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2018-10-24 12:38:09,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:38:09,179 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 51 [2018-10-24 12:38:09,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:09,180 INFO L225 Difference]: With dead ends: 66 [2018-10-24 12:38:09,180 INFO L226 Difference]: Without dead ends: 61 [2018-10-24 12:38:09,182 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=766, Invalid=1396, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:38:09,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-24 12:38:09,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-10-24 12:38:09,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-24 12:38:09,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-10-24 12:38:09,191 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 51 [2018-10-24 12:38:09,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:09,192 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-10-24 12:38:09,192 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:38:09,192 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-10-24 12:38:09,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-24 12:38:09,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:09,194 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:09,194 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:09,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:09,195 INFO L82 PathProgramCache]: Analyzing trace with hash -1227627785, now seen corresponding path program 6 times [2018-10-24 12:38:09,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:09,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:09,196 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:09,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:09,196 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:09,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:10,383 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 12:38:10,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:10,384 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:10,384 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:10,384 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:10,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:10,385 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 12:38:10,394 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:10,394 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:10,414 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:10,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:10,421 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:10,530 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 12:38:10,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:11,308 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 12:38:11,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:11,331 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:38:11,331 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:11,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:38:11,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:38:11,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=936, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:38:11,332 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 22 states. [2018-10-24 12:38:12,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:12,227 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2018-10-24 12:38:12,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:38:12,228 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 60 [2018-10-24 12:38:12,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:12,229 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:38:12,229 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:38:12,231 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1105, Invalid=1975, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:38:12,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:38:12,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-10-24 12:38:12,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-24 12:38:12,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-10-24 12:38:12,239 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 60 [2018-10-24 12:38:12,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:12,239 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-10-24 12:38:12,239 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:38:12,239 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-10-24 12:38:12,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:38:12,241 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:12,241 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:12,241 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:12,241 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:12,241 INFO L82 PathProgramCache]: Analyzing trace with hash 360641155, now seen corresponding path program 7 times [2018-10-24 12:38:12,242 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:12,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:12,243 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:12,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:12,243 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:12,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:12,703 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 12:38:12,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:12,703 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:12,704 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:12,704 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:12,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:12,704 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 12:38:12,712 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:12,712 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:12,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:12,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:12,846 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 12:38:12,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:13,930 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 12:38:13,953 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:13,953 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-24 12:38:13,953 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:13,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:38:13,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:38:13,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1251, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:38:13,956 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 25 states. [2018-10-24 12:38:15,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:15,434 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2018-10-24 12:38:15,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:38:15,438 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-10-24 12:38:15,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:15,439 INFO L225 Difference]: With dead ends: 84 [2018-10-24 12:38:15,439 INFO L226 Difference]: Without dead ends: 79 [2018-10-24 12:38:15,441 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1507, Invalid=2653, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:38:15,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-24 12:38:15,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-24 12:38:15,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:38:15,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-10-24 12:38:15,449 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 69 [2018-10-24 12:38:15,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:15,450 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-10-24 12:38:15,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:38:15,450 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-10-24 12:38:15,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-10-24 12:38:15,452 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:15,452 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:15,452 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:15,452 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:15,452 INFO L82 PathProgramCache]: Analyzing trace with hash -318857097, now seen corresponding path program 8 times [2018-10-24 12:38:15,452 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:15,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:15,454 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:15,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:15,454 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:15,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:15,976 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 12:38:15,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:15,977 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:15,977 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:15,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:15,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:15,977 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 12:38:15,990 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:15,990 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:16,024 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-10-24 12:38:16,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:16,028 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:16,157 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 12:38:16,158 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:17,053 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 12:38:17,075 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:17,075 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-24 12:38:17,075 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:17,076 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:38:17,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:38:17,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=1611, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:38:17,078 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 28 states. [2018-10-24 12:38:18,051 WARN L179 SmtUtils]: Spent 327.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 11 [2018-10-24 12:38:18,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:18,992 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-10-24 12:38:18,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:38:18,995 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 78 [2018-10-24 12:38:18,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:18,996 INFO L225 Difference]: With dead ends: 93 [2018-10-24 12:38:18,997 INFO L226 Difference]: Without dead ends: 88 [2018-10-24 12:38:19,001 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1972, Invalid=3430, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:38:19,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-24 12:38:19,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-10-24 12:38:19,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-10-24 12:38:19,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-10-24 12:38:19,013 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 78 [2018-10-24 12:38:19,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:19,014 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-10-24 12:38:19,014 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:38:19,014 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-10-24 12:38:19,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-24 12:38:19,015 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:19,016 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:19,016 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:19,016 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:19,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1949211389, now seen corresponding path program 9 times [2018-10-24 12:38:19,016 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:19,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:19,017 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:19,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:19,017 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:19,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:20,285 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 12:38:20,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:20,285 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:20,286 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:20,286 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:20,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:20,286 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 12:38:20,301 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:20,301 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:20,330 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:20,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:20,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:20,450 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 12:38:20,451 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:21,703 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 12:38:21,726 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:21,726 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-24 12:38:21,726 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:21,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:38:21,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:38:21,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=2016, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:38:21,729 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 31 states. [2018-10-24 12:38:22,697 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 11 [2018-10-24 12:38:23,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:23,985 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-10-24 12:38:23,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:38:23,993 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2018-10-24 12:38:23,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:23,994 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:38:23,994 INFO L226 Difference]: Without dead ends: 97 [2018-10-24 12:38:23,996 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2500, Invalid=4306, Unknown=0, NotChecked=0, Total=6806 [2018-10-24 12:38:23,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-24 12:38:24,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-24 12:38:24,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-24 12:38:24,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-10-24 12:38:24,007 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 87 [2018-10-24 12:38:24,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:24,012 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-10-24 12:38:24,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:38:24,012 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-10-24 12:38:24,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-24 12:38:24,014 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:24,016 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:24,016 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:24,016 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:24,016 INFO L82 PathProgramCache]: Analyzing trace with hash 1275395575, now seen corresponding path program 10 times [2018-10-24 12:38:24,017 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:24,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:24,017 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:24,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:24,018 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:24,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:24,633 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 12:38:24,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:24,634 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:24,634 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:24,634 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:24,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:24,634 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 12:38:24,643 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:24,644 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:24,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:24,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:24,852 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 12:38:24,853 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:26,452 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 12:38:26,476 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:26,476 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-24 12:38:26,476 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:26,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:38:26,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:38:26,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1316, Invalid=2466, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:38:26,478 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 34 states. [2018-10-24 12:38:28,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:28,779 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2018-10-24 12:38:28,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:38:28,779 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 96 [2018-10-24 12:38:28,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:28,780 INFO L225 Difference]: With dead ends: 111 [2018-10-24 12:38:28,780 INFO L226 Difference]: Without dead ends: 106 [2018-10-24 12:38:28,783 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3091, Invalid=5281, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:38:28,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-24 12:38:28,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-10-24 12:38:28,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-24 12:38:28,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-10-24 12:38:28,791 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 96 [2018-10-24 12:38:28,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:28,792 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-10-24 12:38:28,792 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:38:28,792 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-10-24 12:38:28,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-10-24 12:38:28,794 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:28,794 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:28,794 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:28,794 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:28,794 INFO L82 PathProgramCache]: Analyzing trace with hash -2040776829, now seen corresponding path program 11 times [2018-10-24 12:38:28,795 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:28,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:28,796 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:28,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:28,796 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:28,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:30,109 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 12:38:30,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:30,110 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:30,110 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:30,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:30,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:30,110 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 12:38:30,118 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:30,118 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:30,173 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-10-24 12:38:30,173 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:30,177 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:30,354 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 12:38:30,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:31,987 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 12:38:32,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:32,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-24 12:38:32,017 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:32,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:38:32,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:38:32,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2018-10-24 12:38:32,020 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 37 states. [2018-10-24 12:38:32,268 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 8 [2018-10-24 12:38:34,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:34,689 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2018-10-24 12:38:34,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:38:34,690 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 105 [2018-10-24 12:38:34,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:34,691 INFO L225 Difference]: With dead ends: 120 [2018-10-24 12:38:34,691 INFO L226 Difference]: Without dead ends: 115 [2018-10-24 12:38:34,696 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 176 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3745, Invalid=6355, Unknown=0, NotChecked=0, Total=10100 [2018-10-24 12:38:34,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-24 12:38:34,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-10-24 12:38:34,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-10-24 12:38:34,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2018-10-24 12:38:34,705 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 105 [2018-10-24 12:38:34,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:34,706 INFO L481 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2018-10-24 12:38:34,706 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:38:34,706 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2018-10-24 12:38:34,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-24 12:38:34,707 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:34,708 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:34,708 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:34,708 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:34,708 INFO L82 PathProgramCache]: Analyzing trace with hash -264307849, now seen corresponding path program 12 times [2018-10-24 12:38:34,708 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:34,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:34,709 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:34,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:34,710 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:34,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:35,841 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 12:38:35,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:35,841 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:35,841 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:35,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:35,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:35,842 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 12:38:35,849 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:35,849 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:35,912 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:35,912 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:35,940 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:36,111 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 12:38:36,111 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:38,260 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 12:38:38,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:38,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-24 12:38:38,281 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:38,282 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:38:38,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:38:38,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=3501, Unknown=0, NotChecked=0, Total=5402 [2018-10-24 12:38:38,283 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 40 states. [2018-10-24 12:38:41,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:41,433 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2018-10-24 12:38:41,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:38:41,434 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 114 [2018-10-24 12:38:41,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:41,435 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:38:41,435 INFO L226 Difference]: Without dead ends: 124 [2018-10-24 12:38:41,436 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4462, Invalid=7528, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:38:41,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-24 12:38:41,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-10-24 12:38:41,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-10-24 12:38:41,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-10-24 12:38:41,444 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 114 [2018-10-24 12:38:41,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:41,445 INFO L481 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-10-24 12:38:41,445 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:38:41,445 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-10-24 12:38:41,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-24 12:38:41,447 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:41,447 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:41,447 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:41,448 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:41,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1271360003, now seen corresponding path program 13 times [2018-10-24 12:38:41,448 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:41,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:41,449 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:41,449 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:41,449 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:41,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:42,384 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 12:38:42,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:42,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:42,385 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:42,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:42,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:42,385 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 12:38:42,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:42,393 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:38:42,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:42,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:42,672 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 12:38:42,672 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:44,998 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 12:38:45,019 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:45,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-24 12:38:45,020 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:45,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:38:45,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:38:45,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2234, Invalid=4086, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:38:45,022 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 43 states. [2018-10-24 12:38:48,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:48,967 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2018-10-24 12:38:48,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:38:48,968 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 123 [2018-10-24 12:38:48,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:48,969 INFO L225 Difference]: With dead ends: 138 [2018-10-24 12:38:48,969 INFO L226 Difference]: Without dead ends: 133 [2018-10-24 12:38:48,971 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 206 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=5242, Invalid=8800, Unknown=0, NotChecked=0, Total=14042 [2018-10-24 12:38:48,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-24 12:38:48,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-10-24 12:38:48,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-24 12:38:48,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2018-10-24 12:38:48,978 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 123 [2018-10-24 12:38:48,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:48,978 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2018-10-24 12:38:48,978 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:38:48,978 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2018-10-24 12:38:48,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-24 12:38:48,980 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:48,980 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:48,980 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:48,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:48,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1878746889, now seen corresponding path program 14 times [2018-10-24 12:38:48,981 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:48,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:48,981 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:38:48,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:48,982 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:49,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:50,094 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 12:38:50,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:50,095 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:50,095 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:50,095 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:50,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:50,095 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 12:38:50,105 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:38:50,105 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:38:50,147 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-10-24 12:38:50,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:50,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:50,291 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 12:38:50,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:38:52,958 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 12:38:52,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:38:52,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-24 12:38:52,980 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:38:52,981 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:38:52,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:38:52,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2594, Invalid=4716, Unknown=0, NotChecked=0, Total=7310 [2018-10-24 12:38:52,982 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 46 states. [2018-10-24 12:38:57,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:38:57,404 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-10-24 12:38:57,404 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:38:57,404 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 132 [2018-10-24 12:38:57,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:38:57,405 INFO L225 Difference]: With dead ends: 147 [2018-10-24 12:38:57,406 INFO L226 Difference]: Without dead ends: 142 [2018-10-24 12:38:57,407 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=6085, Invalid=10171, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:38:57,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-24 12:38:57,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-10-24 12:38:57,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-10-24 12:38:57,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-10-24 12:38:57,414 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 132 [2018-10-24 12:38:57,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:38:57,415 INFO L481 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-10-24 12:38:57,415 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:38:57,415 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-10-24 12:38:57,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-10-24 12:38:57,416 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:38:57,416 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:38:57,417 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:38:57,417 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:38:57,417 INFO L82 PathProgramCache]: Analyzing trace with hash -927269757, now seen corresponding path program 15 times [2018-10-24 12:38:57,417 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:38:57,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:57,418 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:38:57,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:38:57,418 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:38:57,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:38:58,639 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 12:38:58,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:58,640 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:38:58,640 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:38:58,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:38:58,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:38:58,640 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 12:38:58,647 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:38:58,648 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:38:58,693 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:38:58,693 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:38:58,703 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:38:58,846 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 12:38:58,847 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:01,557 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 12:39:01,577 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:01,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-24 12:39:01,578 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:01,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:39:01,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:39:01,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2981, Invalid=5391, Unknown=0, NotChecked=0, Total=8372 [2018-10-24 12:39:01,580 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 49 states. [2018-10-24 12:39:06,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:06,468 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2018-10-24 12:39:06,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:39:06,468 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 141 [2018-10-24 12:39:06,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:06,469 INFO L225 Difference]: With dead ends: 156 [2018-10-24 12:39:06,469 INFO L226 Difference]: Without dead ends: 151 [2018-10-24 12:39:06,470 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1296 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=6991, Invalid=11641, Unknown=0, NotChecked=0, Total=18632 [2018-10-24 12:39:06,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-24 12:39:06,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-10-24 12:39:06,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-10-24 12:39:06,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2018-10-24 12:39:06,477 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 141 [2018-10-24 12:39:06,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:06,477 INFO L481 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2018-10-24 12:39:06,477 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:39:06,477 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2018-10-24 12:39:06,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-10-24 12:39:06,478 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:06,478 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:06,479 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:06,479 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:06,479 INFO L82 PathProgramCache]: Analyzing trace with hash -72493449, now seen corresponding path program 16 times [2018-10-24 12:39:06,479 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:06,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:06,480 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:06,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:06,480 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:06,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:07,754 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 12:39:07,754 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:07,755 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:07,755 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:07,755 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:07,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:07,755 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 12:39:07,762 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:07,762 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:39:07,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:08,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:08,348 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 12:39:08,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:11,423 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 12:39:11,443 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:11,443 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-24 12:39:11,443 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:11,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-24 12:39:11,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-24 12:39:11,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3395, Invalid=6111, Unknown=0, NotChecked=0, Total=9506 [2018-10-24 12:39:11,445 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 52 states. [2018-10-24 12:39:11,830 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-10-24 12:39:17,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:17,255 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2018-10-24 12:39:17,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-24 12:39:17,256 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 150 [2018-10-24 12:39:17,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:17,257 INFO L225 Difference]: With dead ends: 165 [2018-10-24 12:39:17,257 INFO L226 Difference]: Without dead ends: 160 [2018-10-24 12:39:17,258 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=7960, Invalid=13210, Unknown=0, NotChecked=0, Total=21170 [2018-10-24 12:39:17,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-24 12:39:17,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-10-24 12:39:17,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-10-24 12:39:17,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-10-24 12:39:17,266 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 150 [2018-10-24 12:39:17,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:17,266 INFO L481 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-10-24 12:39:17,266 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-24 12:39:17,266 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-10-24 12:39:17,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-10-24 12:39:17,267 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:17,267 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:17,267 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:17,267 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:17,268 INFO L82 PathProgramCache]: Analyzing trace with hash 266268419, now seen corresponding path program 17 times [2018-10-24 12:39:17,268 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:17,268 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:17,268 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:17,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:17,269 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:17,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:18,793 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 12:39:18,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:18,794 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:18,794 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:18,794 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:18,794 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:18,794 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 12:39:18,802 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:39:18,802 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:39:18,854 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-10-24 12:39:18,854 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:18,860 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:19,054 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 12:39:19,055 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:22,590 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 12:39:22,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:22,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-24 12:39:22,610 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:22,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-24 12:39:22,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-24 12:39:22,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3836, Invalid=6876, Unknown=0, NotChecked=0, Total=10712 [2018-10-24 12:39:22,612 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 55 states. [2018-10-24 12:39:22,998 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 9 [2018-10-24 12:39:23,126 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:39:23,261 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:39:23,529 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-24 12:39:29,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:29,065 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2018-10-24 12:39:29,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:39:29,066 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 159 [2018-10-24 12:39:29,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:29,067 INFO L225 Difference]: With dead ends: 174 [2018-10-24 12:39:29,068 INFO L226 Difference]: Without dead ends: 169 [2018-10-24 12:39:29,069 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 266 SyntacticMatches, 2 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=8992, Invalid=14878, Unknown=0, NotChecked=0, Total=23870 [2018-10-24 12:39:29,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-24 12:39:29,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-10-24 12:39:29,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-24 12:39:29,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2018-10-24 12:39:29,076 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 159 [2018-10-24 12:39:29,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:29,077 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2018-10-24 12:39:29,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-24 12:39:29,077 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2018-10-24 12:39:29,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-24 12:39:29,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:29,078 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:29,078 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:29,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:29,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1651330057, now seen corresponding path program 18 times [2018-10-24 12:39:29,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:29,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:29,079 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:29,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:29,080 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:29,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:31,165 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 12:39:31,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:31,165 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:31,165 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:31,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:31,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:31,166 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 12:39:31,178 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:39:31,178 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:39:31,288 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:39:31,288 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:39:31,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:31,507 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 12:39:31,507 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:35,467 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 12:39:35,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:35,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-24 12:39:35,488 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:35,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-24 12:39:35,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-24 12:39:35,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4304, Invalid=7686, Unknown=0, NotChecked=0, Total=11990 [2018-10-24 12:39:35,490 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 58 states. [2018-10-24 12:39:35,654 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2018-10-24 12:39:35,906 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-10-24 12:39:36,047 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:39:36,195 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:39:36,335 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:39:36,482 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:39:36,633 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:39:36,786 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:39:42,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:42,903 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2018-10-24 12:39:42,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-24 12:39:42,904 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 168 [2018-10-24 12:39:42,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:42,905 INFO L225 Difference]: With dead ends: 183 [2018-10-24 12:39:42,906 INFO L226 Difference]: Without dead ends: 178 [2018-10-24 12:39:42,907 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1800 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=10087, Invalid=16645, Unknown=0, NotChecked=0, Total=26732 [2018-10-24 12:39:42,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-24 12:39:42,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-10-24 12:39:42,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-10-24 12:39:42,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-10-24 12:39:42,915 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 168 [2018-10-24 12:39:42,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:42,915 INFO L481 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-10-24 12:39:42,915 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-24 12:39:42,915 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-10-24 12:39:42,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-10-24 12:39:42,916 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:42,916 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:42,917 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:42,917 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:42,917 INFO L82 PathProgramCache]: Analyzing trace with hash -639942269, now seen corresponding path program 19 times [2018-10-24 12:39:42,917 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:42,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:42,918 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:39:42,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:42,918 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:43,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:44,702 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 12:39:44,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:44,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:39:44,703 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:39:44,703 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:39:44,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:39:44,703 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 12:39:44,711 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:44,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:39:44,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:39:45,112 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:39:45,415 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 12:39:45,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:39:49,673 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 12:39:49,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:39:49,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-24 12:39:49,694 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:39:49,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-24 12:39:49,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-24 12:39:49,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4799, Invalid=8541, Unknown=0, NotChecked=0, Total=13340 [2018-10-24 12:39:49,696 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 61 states. [2018-10-24 12:39:49,905 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-10-24 12:39:50,029 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2018-10-24 12:39:50,177 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2018-10-24 12:39:50,327 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:39:50,483 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:39:50,647 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:39:50,814 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:39:50,979 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:39:51,145 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:39:51,315 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:39:51,486 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:39:58,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:39:58,248 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-10-24 12:39:58,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-24 12:39:58,249 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 177 [2018-10-24 12:39:58,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:39:58,251 INFO L225 Difference]: With dead ends: 192 [2018-10-24 12:39:58,251 INFO L226 Difference]: Without dead ends: 187 [2018-10-24 12:39:58,253 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 296 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1986 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=11245, Invalid=18511, Unknown=0, NotChecked=0, Total=29756 [2018-10-24 12:39:58,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-24 12:39:58,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-10-24 12:39:58,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-24 12:39:58,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2018-10-24 12:39:58,260 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 177 [2018-10-24 12:39:58,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:39:58,261 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2018-10-24 12:39:58,261 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-24 12:39:58,261 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2018-10-24 12:39:58,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-24 12:39:58,262 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:39:58,262 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:39:58,262 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:39:58,262 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:39:58,263 INFO L82 PathProgramCache]: Analyzing trace with hash -99929737, now seen corresponding path program 20 times [2018-10-24 12:39:58,263 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:39:58,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:58,263 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:39:58,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:39:58,264 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:39:58,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:00,206 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 12:40:00,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:00,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:00,206 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:00,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:00,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:00,207 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 12:40:00,222 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:40:00,222 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:40:00,362 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-10-24 12:40:00,362 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:00,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:00,553 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 12:40:00,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:05,322 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 12:40:05,356 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:05,356 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-24 12:40:05,356 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:05,357 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-24 12:40:05,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-24 12:40:05,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5321, Invalid=9441, Unknown=0, NotChecked=0, Total=14762 [2018-10-24 12:40:05,359 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 64 states. [2018-10-24 12:40:05,608 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 8 [2018-10-24 12:40:05,743 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-10-24 12:40:05,904 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-10-24 12:40:06,065 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:40:06,235 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:40:06,407 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:40:06,576 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:40:06,754 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:40:06,928 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:40:07,116 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:40:07,303 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:40:07,485 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:40:07,670 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:40:07,849 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:40:08,240 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-24 12:40:15,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:15,110 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2018-10-24 12:40:15,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-24 12:40:15,114 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 186 [2018-10-24 12:40:15,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:15,115 INFO L225 Difference]: With dead ends: 201 [2018-10-24 12:40:15,115 INFO L226 Difference]: Without dead ends: 196 [2018-10-24 12:40:15,116 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 311 SyntacticMatches, 2 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2181 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=12466, Invalid=20476, Unknown=0, NotChecked=0, Total=32942 [2018-10-24 12:40:15,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-24 12:40:15,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-10-24 12:40:15,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-10-24 12:40:15,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-10-24 12:40:15,123 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 186 [2018-10-24 12:40:15,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:15,124 INFO L481 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-10-24 12:40:15,124 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-24 12:40:15,124 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-10-24 12:40:15,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-24 12:40:15,125 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:15,125 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:15,125 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:15,126 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:15,126 INFO L82 PathProgramCache]: Analyzing trace with hash 89650179, now seen corresponding path program 21 times [2018-10-24 12:40:15,126 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:15,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:15,127 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:15,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:15,127 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:15,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:17,470 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 12:40:17,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:17,470 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:17,470 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:17,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:17,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:17,471 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 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 12:40:17,477 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:40:17,477 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:40:17,695 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:40:17,695 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:17,813 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:18,038 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 12:40:18,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:23,316 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 12:40:23,336 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:23,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-24 12:40:23,336 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:23,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-24 12:40:23,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-24 12:40:23,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5870, Invalid=10386, Unknown=0, NotChecked=0, Total=16256 [2018-10-24 12:40:23,338 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 67 states. [2018-10-24 12:40:23,551 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-10-24 12:40:23,699 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 8 [2018-10-24 12:40:23,874 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 9 [2018-10-24 12:40:24,045 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-24 12:40:24,223 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-24 12:40:24,406 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-24 12:40:24,584 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:40:24,768 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:40:24,951 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:40:25,141 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:40:25,344 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:40:25,541 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:40:25,743 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:40:25,941 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:40:26,145 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:40:26,352 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:40:26,549 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:40:26,904 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:40:27,104 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-24 12:40:34,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:34,303 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2018-10-24 12:40:34,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-24 12:40:34,303 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 195 [2018-10-24 12:40:34,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:34,305 INFO L225 Difference]: With dead ends: 210 [2018-10-24 12:40:34,305 INFO L226 Difference]: Without dead ends: 205 [2018-10-24 12:40:34,306 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 326 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2385 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=13750, Invalid=22540, Unknown=0, NotChecked=0, Total=36290 [2018-10-24 12:40:34,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-24 12:40:34,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-10-24 12:40:34,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-24 12:40:34,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2018-10-24 12:40:34,315 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 195 [2018-10-24 12:40:34,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:34,315 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2018-10-24 12:40:34,315 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-24 12:40:34,315 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2018-10-24 12:40:34,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-24 12:40:34,316 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:34,316 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:34,316 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:34,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:34,317 INFO L82 PathProgramCache]: Analyzing trace with hash 795823863, now seen corresponding path program 22 times [2018-10-24 12:40:34,317 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:34,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:34,317 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:40:34,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:34,318 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:34,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:36,852 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 12:40:36,852 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:36,852 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:36,852 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:36,853 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:36,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:36,853 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 12:40:36,860 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:36,860 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:40:37,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:37,470 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:37,696 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 12:40:37,696 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:40:43,475 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 12:40:43,495 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:40:43,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-24 12:40:43,495 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:40:43,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-24 12:40:43,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-24 12:40:43,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6446, Invalid=11376, Unknown=0, NotChecked=0, Total=17822 [2018-10-24 12:40:43,497 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 70 states. [2018-10-24 12:40:43,726 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2018-10-24 12:40:43,884 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-10-24 12:40:44,069 WARN L179 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-10-24 12:40:44,246 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-24 12:40:44,432 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-24 12:40:44,622 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-24 12:40:44,818 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-24 12:40:45,028 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-24 12:40:45,226 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-24 12:40:45,426 WARN L179 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:40:45,642 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:40:45,855 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:40:46,064 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:40:46,269 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:40:46,488 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:40:46,707 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:40:46,923 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:40:47,143 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:40:47,362 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:40:47,590 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:40:51,016 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 11 [2018-10-24 12:40:55,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:40:55,727 INFO L93 Difference]: Finished difference Result 219 states and 221 transitions. [2018-10-24 12:40:55,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-24 12:40:55,728 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 204 [2018-10-24 12:40:55,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:40:55,730 INFO L225 Difference]: With dead ends: 219 [2018-10-24 12:40:55,730 INFO L226 Difference]: Without dead ends: 214 [2018-10-24 12:40:55,731 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 341 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2598 ImplicationChecksByTransitivity, 19.7s TimeCoverageRelationStatistics Valid=15097, Invalid=24703, Unknown=0, NotChecked=0, Total=39800 [2018-10-24 12:40:55,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-24 12:40:55,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2018-10-24 12:40:55,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-10-24 12:40:55,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2018-10-24 12:40:55,739 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 204 [2018-10-24 12:40:55,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:40:55,740 INFO L481 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2018-10-24 12:40:55,740 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-24 12:40:55,740 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2018-10-24 12:40:55,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-10-24 12:40:55,741 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:40:55,741 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:40:55,741 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:40:55,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:40:55,742 INFO L82 PathProgramCache]: Analyzing trace with hash 385681027, now seen corresponding path program 23 times [2018-10-24 12:40:55,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:40:55,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:55,743 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:40:55,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:40:55,743 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:40:56,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:40:58,452 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 12:40:58,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:58,453 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:40:58,453 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:40:58,453 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:40:58,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:40:58,453 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 12:40:58,461 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:40:58,461 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:40:58,585 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2018-10-24 12:40:58,585 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:40:58,593 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:40:58,835 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 12:40:58,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:05,178 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 12:41:05,200 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:05,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-24 12:41:05,200 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:05,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-24 12:41:05,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-24 12:41:05,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7049, Invalid=12411, Unknown=0, NotChecked=0, Total=19460 [2018-10-24 12:41:05,202 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 73 states. [2018-10-24 12:41:05,968 WARN L179 SmtUtils]: Spent 339.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-10-24 12:41:06,135 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2018-10-24 12:41:06,326 WARN L179 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2018-10-24 12:41:06,528 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-24 12:41:06,742 WARN L179 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-24 12:41:06,951 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-24 12:41:07,164 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-24 12:41:07,383 WARN L179 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-24 12:41:07,598 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-24 12:41:07,818 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-24 12:41:08,041 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-24 12:41:08,263 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-24 12:41:08,481 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:41:08,712 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:41:08,942 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:41:09,170 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:41:09,397 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:41:09,636 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:41:09,881 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:41:10,288 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:41:10,523 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:41:10,757 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:41:10,989 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:41:11,221 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:41:11,458 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-10-24 12:41:19,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:19,588 INFO L93 Difference]: Finished difference Result 228 states and 230 transitions. [2018-10-24 12:41:19,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-24 12:41:19,591 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 213 [2018-10-24 12:41:19,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:19,592 INFO L225 Difference]: With dead ends: 228 [2018-10-24 12:41:19,593 INFO L226 Difference]: Without dead ends: 223 [2018-10-24 12:41:19,594 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 356 SyntacticMatches, 2 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2820 ImplicationChecksByTransitivity, 22.2s TimeCoverageRelationStatistics Valid=16507, Invalid=26965, Unknown=0, NotChecked=0, Total=43472 [2018-10-24 12:41:19,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-24 12:41:19,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2018-10-24 12:41:19,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-10-24 12:41:19,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2018-10-24 12:41:19,603 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 213 [2018-10-24 12:41:19,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:19,604 INFO L481 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2018-10-24 12:41:19,604 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-24 12:41:19,604 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2018-10-24 12:41:19,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-10-24 12:41:19,605 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:19,605 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:19,605 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:19,606 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:19,606 INFO L82 PathProgramCache]: Analyzing trace with hash 1981222007, now seen corresponding path program 24 times [2018-10-24 12:41:19,606 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:19,606 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:19,607 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:19,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:19,607 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:19,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:22,450 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 12:41:22,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:22,451 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:22,451 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:22,451 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:22,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:22,451 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 12:41:22,460 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:41:22,461 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:41:22,827 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:41:22,827 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:41:23,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:23,351 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 12:41:23,351 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:30,204 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 12:41:30,225 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:30,225 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-10-24 12:41:30,225 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:30,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-10-24 12:41:30,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-10-24 12:41:30,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7679, Invalid=13491, Unknown=0, NotChecked=0, Total=21170 [2018-10-24 12:41:30,227 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 76 states. [2018-10-24 12:41:30,572 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 8 [2018-10-24 12:41:30,766 WARN L179 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-10-24 12:41:30,970 WARN L179 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-10-24 12:41:31,176 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-10-24 12:41:31,392 WARN L179 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-10-24 12:41:31,610 WARN L179 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-10-24 12:41:31,837 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-24 12:41:32,065 WARN L179 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-24 12:41:32,295 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-24 12:41:32,529 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-24 12:41:32,781 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-24 12:41:33,021 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-24 12:41:33,265 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-24 12:41:33,512 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-24 12:41:33,753 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-24 12:41:34,022 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:41:34,263 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:41:34,510 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:41:34,755 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:41:35,006 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:41:35,252 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:41:35,508 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:41:35,757 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:41:36,013 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:41:36,260 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:41:36,516 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:41:36,761 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-10-24 12:41:37,491 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-10-24 12:41:45,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:41:45,452 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-10-24 12:41:45,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-10-24 12:41:45,453 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 222 [2018-10-24 12:41:45,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:41:45,455 INFO L225 Difference]: With dead ends: 237 [2018-10-24 12:41:45,455 INFO L226 Difference]: Without dead ends: 232 [2018-10-24 12:41:45,458 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 589 GetRequests, 371 SyntacticMatches, 2 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3051 ImplicationChecksByTransitivity, 24.0s TimeCoverageRelationStatistics Valid=17980, Invalid=29326, Unknown=0, NotChecked=0, Total=47306 [2018-10-24 12:41:45,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-10-24 12:41:45,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2018-10-24 12:41:45,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-10-24 12:41:45,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2018-10-24 12:41:45,467 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 222 [2018-10-24 12:41:45,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:41:45,467 INFO L481 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2018-10-24 12:41:45,467 INFO L482 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-10-24 12:41:45,468 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2018-10-24 12:41:45,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-10-24 12:41:45,469 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:41:45,469 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:41:45,469 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:41:45,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:41:45,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1183680253, now seen corresponding path program 25 times [2018-10-24 12:41:45,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:41:45,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:45,470 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:41:45,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:41:45,471 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:41:45,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:49,716 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:49,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:49,716 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:41:49,716 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:41:49,716 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:41:49,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:41:49,717 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 12:41:49,726 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:41:49,726 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:41:50,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:41:50,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:41:50,850 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:50,850 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:41:58,202 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:41:58,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:41:58,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 152 [2018-10-24 12:41:58,224 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:41:58,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-10-24 12:41:58,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-10-24 12:41:58,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8336, Invalid=14616, Unknown=0, NotChecked=0, Total=22952 [2018-10-24 12:41:58,226 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 79 states. [2018-10-24 12:41:58,483 WARN L179 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-10-24 12:41:58,670 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 222 DAG size of output: 8 [2018-10-24 12:41:58,889 WARN L179 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 9 [2018-10-24 12:41:59,116 WARN L179 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-10-24 12:41:59,351 WARN L179 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-10-24 12:41:59,585 WARN L179 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-10-24 12:41:59,821 WARN L179 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-10-24 12:42:00,055 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-10-24 12:42:00,319 WARN L179 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-10-24 12:42:00,574 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-10-24 12:42:01,681 WARN L179 SmtUtils]: Spent 766.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-10-24 12:42:01,935 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-10-24 12:42:02,195 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-10-24 12:42:02,572 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-10-24 12:42:02,831 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-10-24 12:42:03,099 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-10-24 12:42:03,361 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-10-24 12:42:03,620 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-10-24 12:42:03,876 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-10-24 12:42:04,147 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-10-24 12:42:04,415 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-10-24 12:42:04,703 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-10-24 12:42:04,966 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-10-24 12:42:05,227 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-10-24 12:42:05,491 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-10-24 12:42:05,756 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-10-24 12:42:06,025 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-10-24 12:42:06,289 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-10-24 12:42:06,551 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-10-24 12:42:06,809 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 Received shutdown request... [2018-10-24 12:42:08,014 WARN L187 SmtUtils]: Removed 25 from assertion stack [2018-10-24 12:42:08,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:42:08,015 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:42:08,019 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:42:08,019 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:42:08 BoogieIcfgContainer [2018-10-24 12:42:08,019 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:42:08,025 INFO L168 Benchmark]: Toolchain (without parser) took 248278.58 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 789.1 MB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -200.8 MB). Peak memory consumption was 588.2 MB. Max. memory is 7.1 GB. [2018-10-24 12:42:08,026 INFO L168 Benchmark]: CDTParser took 1.23 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 12:42:08,026 INFO L168 Benchmark]: CACSL2BoogieTranslator took 257.86 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 12:42:08,026 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.56 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 12:42:08,027 INFO L168 Benchmark]: Boogie Preprocessor took 30.80 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 12:42:08,027 INFO L168 Benchmark]: RCFGBuilder took 394.26 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 781.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -822.5 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-24 12:42:08,028 INFO L168 Benchmark]: TraceAbstraction took 247560.22 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 7.3 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 611.1 MB). Peak memory consumption was 618.5 MB. Max. memory is 7.1 GB. [2018-10-24 12:42:08,030 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.23 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 257.86 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 25.56 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 30.80 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 394.26 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 781.7 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -822.5 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 247560.22 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 7.3 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 611.1 MB). Peak memory consumption was 618.5 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 constructing difference of abstraction (232states) and FLOYD_HOARE automaton (currently 36 states, 79 states before enhancement),while PredicateUnifier was unifying predicates,while SimplifyDDAWithTimeout was simplifying term of DAG size 134. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 247.4s OverallTime, 27 OverallIterations, 74 TraceHistogramMax, 131.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 352 SDtfs, 3888 SDslu, 8680 SDs, 0 SdLazy, 4057 SolverSat, 2429 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8092 GetRequests, 5154 SyntacticMatches, 50 SemanticMatches, 2887 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28650 ImplicationChecksByTransitivity, 224.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=232occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 26 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 5.7s SatisfiabilityAnalysisTime, 108.2s InterpolantComputationTime, 6173 NumberOfCodeBlocks, 6173 NumberOfCodeBlocksAsserted, 344 NumberOfCheckSat, 9171 ConstructedInterpolants, 74 QuantifiedInterpolants, 8659439 SizeOfPredicates, 75 NumberOfNonLiveVariables, 4425 ConjunctsInSsa, 1000 ConjunctsInUnsatCore, 77 InterpolantComputations, 2 PerfectInterpolantSequences, 0/208050 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown