java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 04:14:03,826 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 04:14:03,828 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 04:14:03,840 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 04:14:03,840 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 04:14:03,841 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 04:14:03,843 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 04:14:03,844 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 04:14:03,846 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 04:14:03,849 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 04:14:03,851 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 04:14:03,851 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 04:14:03,852 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 04:14:03,853 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 04:14:03,854 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 04:14:03,855 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 04:14:03,856 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 04:14:03,858 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 04:14:03,862 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 04:14:03,863 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 04:14:03,866 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 04:14:03,868 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 04:14:03,873 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 04:14:03,873 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 04:14:03,874 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 04:14:03,875 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 04:14:03,876 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 04:14:03,879 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 04:14:03,882 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 04:14:03,884 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 04:14:03,885 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 04:14:03,887 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 04:14:03,889 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-27 04:14:03,917 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 04:14:03,917 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 04:14:03,921 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 04:14:03,921 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 04:14:03,921 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 04:14:03,921 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 04:14:03,921 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 04:14:03,922 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 04:14:03,922 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 04:14:03,922 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 04:14:03,922 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 04:14:03,922 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 04:14:03,923 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 04:14:03,924 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 04:14:03,924 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 04:14:03,924 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 04:14:03,924 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 04:14:03,925 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 04:14:03,926 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 04:14:03,927 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 04:14:03,927 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 04:14:03,927 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 04:14:03,927 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 04:14:03,928 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 04:14:03,928 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:14:03,928 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 04:14:03,928 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 04:14:03,929 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 04:14:03,929 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 04:14:03,929 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 04:14:03,929 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 04:14:03,929 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 04:14:03,930 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 04:14:03,930 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 04:14:03,993 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 04:14:04,010 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 04:14:04,015 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 04:14:04,017 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 04:14:04,017 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 04:14:04,018 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i [2018-10-27 04:14:04,089 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/0e034ebb2/e30c1564771e4ebfb6dec3ea85c964f8/FLAGa9c391504 [2018-10-27 04:14:04,544 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 04:14:04,545 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i [2018-10-27 04:14:04,551 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/0e034ebb2/e30c1564771e4ebfb6dec3ea85c964f8/FLAGa9c391504 [2018-10-27 04:14:04,568 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/0e034ebb2/e30c1564771e4ebfb6dec3ea85c964f8 [2018-10-27 04:14:04,580 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 04:14:04,581 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 04:14:04,582 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 04:14:04,582 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 04:14:04,586 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 04:14:04,587 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,590 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3299714f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04, skipping insertion in model container [2018-10-27 04:14:04,591 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,601 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 04:14:04,621 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 04:14:04,793 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:14:04,797 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 04:14:04,811 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:14:04,825 INFO L193 MainTranslator]: Completed translation [2018-10-27 04:14:04,826 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04 WrapperNode [2018-10-27 04:14:04,826 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 04:14:04,826 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 04:14:04,827 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 04:14:04,827 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 04:14:04,835 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,841 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,847 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 04:14:04,847 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 04:14:04,848 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 04:14:04,848 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 04:14:04,856 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,856 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,856 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,857 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,860 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,865 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,865 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (1/1) ... [2018-10-27 04:14:04,867 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 04:14:04,867 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 04:14:04,868 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 04:14:04,868 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 04:14:04,868 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (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 [2018-10-27 04:14:04,981 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 04:14:04,981 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 04:14:04,981 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 04:14:04,981 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 04:14:04,981 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 04:14:04,982 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 04:14:04,982 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 04:14:04,982 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 04:14:05,199 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 04:14:05,199 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:14:05 BoogieIcfgContainer [2018-10-27 04:14:05,200 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 04:14:05,201 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 04:14:05,201 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 04:14:05,204 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 04:14:05,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 04:14:04" (1/3) ... [2018-10-27 04:14:05,205 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7db34117 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:14:05, skipping insertion in model container [2018-10-27 04:14:05,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:14:04" (2/3) ... [2018-10-27 04:14:05,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7db34117 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:14:05, skipping insertion in model container [2018-10-27 04:14:05,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:14:05" (3/3) ... [2018-10-27 04:14:05,208 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_nondet_true-unreach-call_true-termination.i [2018-10-27 04:14:05,218 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 04:14:05,226 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 04:14:05,247 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 04:14:05,289 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 04:14:05,289 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 04:14:05,289 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 04:14:05,290 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 04:14:05,290 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 04:14:05,290 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 04:14:05,290 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 04:14:05,290 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 04:14:05,313 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-27 04:14:05,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 04:14:05,321 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:05,322 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:05,325 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:05,332 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:05,332 INFO L82 PathProgramCache]: Analyzing trace with hash -722424895, now seen corresponding path program 1 times [2018-10-27 04:14:05,336 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:05,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,397 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:05,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,397 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:05,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:05,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:05,456 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:14:05,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 04:14:05,457 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:14:05,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 04:14:05,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 04:14:05,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:14:05,476 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-27 04:14:05,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:05,497 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2018-10-27 04:14:05,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 04:14:05,498 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 04:14:05,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:05,510 INFO L225 Difference]: With dead ends: 32 [2018-10-27 04:14:05,510 INFO L226 Difference]: Without dead ends: 13 [2018-10-27 04:14:05,514 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 [2018-10-27 04:14:05,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-27 04:14:05,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-27 04:14:05,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-27 04:14:05,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-27 04:14:05,550 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-27 04:14:05,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:05,551 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-27 04:14:05,551 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 04:14:05,551 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-27 04:14:05,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 04:14:05,552 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:05,552 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:05,553 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:05,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:05,553 INFO L82 PathProgramCache]: Analyzing trace with hash -1289299715, now seen corresponding path program 1 times [2018-10-27 04:14:05,554 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:05,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,555 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:05,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,556 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:05,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:05,654 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:05,655 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:14:05,655 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 04:14:05,655 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:14:05,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 04:14:05,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 04:14:05,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:14:05,660 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-10-27 04:14:05,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:05,746 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 04:14:05,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 04:14:05,747 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 04:14:05,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:05,748 INFO L225 Difference]: With dead ends: 21 [2018-10-27 04:14:05,749 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 04:14:05,750 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:14:05,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 04:14:05,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-27 04:14:05,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-27 04:14:05,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-27 04:14:05,756 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-10-27 04:14:05,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:05,757 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-27 04:14:05,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 04:14:05,757 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-27 04:14:05,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 04:14:05,758 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:05,758 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:05,758 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:05,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:05,759 INFO L82 PathProgramCache]: Analyzing trace with hash 1003978365, now seen corresponding path program 1 times [2018-10-27 04:14:05,759 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:05,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,760 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:05,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:05,760 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:05,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:05,894 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:05,895 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:05,895 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:05,896 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-27 04:14:05,898 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [25], [28], [30], [36], [37], [38], [40] [2018-10-27 04:14:05,943 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:14:05,943 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:14:06,322 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:14:06,323 INFO L272 AbstractInterpreter]: Visited 13 different actions 96 times. Merged at 4 different actions 46 times. Widened at 1 different actions 8 times. Found 1 fixpoints after 1 different actions. Largest state had 5 variables. [2018-10-27 04:14:06,339 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:06,341 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:14:06,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:06,341 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 [2018-10-27 04:14:06,360 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:06,360 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:06,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:06,397 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:06,428 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:06,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:06,525 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:06,550 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:06,551 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2018-10-27 04:14:06,551 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:06,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 04:14:06,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 04:14:06,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-27 04:14:06,552 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-10-27 04:14:06,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:06,618 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-27 04:14:06,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 04:14:06,619 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-27 04:14:06,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:06,619 INFO L225 Difference]: With dead ends: 23 [2018-10-27 04:14:06,620 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 04:14:06,620 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-27 04:14:06,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 04:14:06,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 04:14:06,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 04:14:06,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-27 04:14:06,626 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-10-27 04:14:06,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:06,626 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-27 04:14:06,626 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 04:14:06,627 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-27 04:14:06,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 04:14:06,627 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:06,627 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:06,628 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:06,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:06,628 INFO L82 PathProgramCache]: Analyzing trace with hash 6482173, now seen corresponding path program 2 times [2018-10-27 04:14:06,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:06,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:06,629 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:06,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:06,630 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:06,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:06,780 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:06,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:06,781 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:06,781 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:06,781 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:06,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:06,781 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 [2018-10-27 04:14:06,792 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:06,792 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:06,836 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 04:14:06,836 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:06,839 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:06,897 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:06,898 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:07,268 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:07,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:07,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 04:14:07,289 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:07,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 04:14:07,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 04:14:07,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-10-27 04:14:07,290 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 7 states. [2018-10-27 04:14:07,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:07,368 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 04:14:07,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 04:14:07,368 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2018-10-27 04:14:07,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:07,369 INFO L225 Difference]: With dead ends: 27 [2018-10-27 04:14:07,369 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 04:14:07,370 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-10-27 04:14:07,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 04:14:07,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-27 04:14:07,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-27 04:14:07,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-27 04:14:07,376 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-10-27 04:14:07,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:07,376 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-27 04:14:07,377 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 04:14:07,377 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-27 04:14:07,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-27 04:14:07,378 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:07,378 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:07,378 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:07,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:07,379 INFO L82 PathProgramCache]: Analyzing trace with hash 476147325, now seen corresponding path program 3 times [2018-10-27 04:14:07,379 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:07,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:07,380 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:07,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:07,380 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:07,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:07,603 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:07,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:07,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:07,604 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:07,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:07,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:07,604 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 04:14:07,613 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:07,613 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:07,633 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:07,633 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:07,635 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:07,657 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:07,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:07,861 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:07,886 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:07,886 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 04:14:07,886 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:07,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 04:14:07,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 04:14:07,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:14:07,887 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2018-10-27 04:14:08,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:08,131 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-27 04:14:08,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 04:14:08,134 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-10-27 04:14:08,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:08,136 INFO L225 Difference]: With dead ends: 30 [2018-10-27 04:14:08,137 INFO L226 Difference]: Without dead ends: 25 [2018-10-27 04:14:08,138 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2018-10-27 04:14:08,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-27 04:14:08,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-27 04:14:08,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 04:14:08,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-27 04:14:08,148 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-27 04:14:08,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:08,148 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-27 04:14:08,148 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 04:14:08,148 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-27 04:14:08,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 04:14:08,151 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:08,151 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:08,151 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:08,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:08,155 INFO L82 PathProgramCache]: Analyzing trace with hash -732759811, now seen corresponding path program 4 times [2018-10-27 04:14:08,155 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:08,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:08,156 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:08,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:08,157 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:08,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:08,322 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:08,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:08,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:08,324 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:08,324 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:08,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:08,324 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 [2018-10-27 04:14:08,339 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:08,339 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:08,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:08,354 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:08,384 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:08,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:08,536 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:08,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:08,559 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 04:14:08,559 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:08,559 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 04:14:08,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 04:14:08,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2018-10-27 04:14:08,560 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-27 04:14:08,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:08,602 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 04:14:08,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 04:14:08,605 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-27 04:14:08,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:08,606 INFO L225 Difference]: With dead ends: 33 [2018-10-27 04:14:08,606 INFO L226 Difference]: Without dead ends: 28 [2018-10-27 04:14:08,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2018-10-27 04:14:08,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-27 04:14:08,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-27 04:14:08,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-27 04:14:08,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-27 04:14:08,612 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-27 04:14:08,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:08,613 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-27 04:14:08,613 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 04:14:08,613 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-27 04:14:08,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-27 04:14:08,614 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:08,614 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:08,614 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:08,614 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:08,615 INFO L82 PathProgramCache]: Analyzing trace with hash -1984471427, now seen corresponding path program 5 times [2018-10-27 04:14:08,615 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:08,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:08,616 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:08,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:08,616 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:08,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:08,788 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:08,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:08,788 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:08,788 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:08,789 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:08,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:08,789 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 [2018-10-27 04:14:08,800 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:08,800 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:08,900 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 04:14:08,900 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:08,903 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:08,999 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:08,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:09,269 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:09,299 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:09,299 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 04:14:09,299 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:09,300 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 04:14:09,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 04:14:09,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2018-10-27 04:14:09,301 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 10 states. [2018-10-27 04:14:09,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:09,359 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-27 04:14:09,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 04:14:09,359 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-27 04:14:09,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:09,360 INFO L225 Difference]: With dead ends: 36 [2018-10-27 04:14:09,360 INFO L226 Difference]: Without dead ends: 31 [2018-10-27 04:14:09,361 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2018-10-27 04:14:09,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-27 04:14:09,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-27 04:14:09,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 04:14:09,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-27 04:14:09,367 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-27 04:14:09,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:09,367 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-27 04:14:09,367 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 04:14:09,367 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-27 04:14:09,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 04:14:09,368 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:09,368 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:09,368 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:09,369 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:09,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1475807485, now seen corresponding path program 6 times [2018-10-27 04:14:09,369 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:09,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:09,370 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:09,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:09,370 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:09,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:09,521 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:09,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:09,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:09,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:09,522 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:09,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:09,522 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 [2018-10-27 04:14:09,531 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:09,531 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:09,574 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:09,574 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:09,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:09,620 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:09,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:09,826 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:09,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:09,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 04:14:09,847 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:09,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 04:14:09,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 04:14:09,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=250, Unknown=0, NotChecked=0, Total=380 [2018-10-27 04:14:09,849 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 11 states. [2018-10-27 04:14:09,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:09,913 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 04:14:09,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 04:14:09,913 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2018-10-27 04:14:09,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:09,914 INFO L225 Difference]: With dead ends: 39 [2018-10-27 04:14:09,914 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 04:14:09,915 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2018-10-27 04:14:09,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 04:14:09,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-27 04:14:09,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-27 04:14:09,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-27 04:14:09,921 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-27 04:14:09,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:09,921 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-27 04:14:09,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 04:14:09,922 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-27 04:14:09,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-27 04:14:09,923 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:09,923 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:09,923 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:09,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:09,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1160163715, now seen corresponding path program 7 times [2018-10-27 04:14:09,924 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:09,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:09,924 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:09,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:09,925 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:09,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:10,106 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:10,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:10,107 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:10,107 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:10,107 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:10,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:10,107 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 [2018-10-27 04:14:10,116 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:10,116 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:10,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:10,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:10,167 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:10,167 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:10,429 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:10,450 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:10,450 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 04:14:10,450 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:10,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 04:14:10,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 04:14:10,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=299, Unknown=0, NotChecked=0, Total=462 [2018-10-27 04:14:10,452 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 12 states. [2018-10-27 04:14:10,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:10,687 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-27 04:14:10,687 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 04:14:10,687 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2018-10-27 04:14:10,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:10,689 INFO L225 Difference]: With dead ends: 42 [2018-10-27 04:14:10,689 INFO L226 Difference]: Without dead ends: 37 [2018-10-27 04:14:10,690 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=169, Invalid=337, Unknown=0, NotChecked=0, Total=506 [2018-10-27 04:14:10,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-27 04:14:10,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-27 04:14:10,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 04:14:10,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-27 04:14:10,695 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-27 04:14:10,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:10,696 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-27 04:14:10,696 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 04:14:10,696 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-27 04:14:10,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 04:14:10,697 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:10,697 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:10,697 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:10,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:10,698 INFO L82 PathProgramCache]: Analyzing trace with hash -196142851, now seen corresponding path program 8 times [2018-10-27 04:14:10,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:10,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:10,699 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:10,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:10,699 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:10,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:10,875 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:10,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:10,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:10,876 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:10,877 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:10,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:10,877 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 [2018-10-27 04:14:10,887 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:10,887 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:10,914 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 04:14:10,914 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:10,917 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:10,946 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:10,946 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:11,226 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:11,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:11,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 04:14:11,247 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:11,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 04:14:11,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 04:14:11,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2018-10-27 04:14:11,249 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 13 states. [2018-10-27 04:14:11,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:11,334 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 04:14:11,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 04:14:11,335 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2018-10-27 04:14:11,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:11,336 INFO L225 Difference]: With dead ends: 45 [2018-10-27 04:14:11,336 INFO L226 Difference]: Without dead ends: 40 [2018-10-27 04:14:11,338 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=206, Invalid=394, Unknown=0, NotChecked=0, Total=600 [2018-10-27 04:14:11,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-27 04:14:11,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-27 04:14:11,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-27 04:14:11,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-27 04:14:11,344 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-27 04:14:11,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:11,345 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-27 04:14:11,345 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 04:14:11,345 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-27 04:14:11,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-27 04:14:11,346 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:11,346 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:11,346 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:11,347 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:11,347 INFO L82 PathProgramCache]: Analyzing trace with hash -1496891779, now seen corresponding path program 9 times [2018-10-27 04:14:11,347 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:11,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:11,348 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:11,348 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:11,348 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:11,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:11,546 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:11,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:11,546 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:11,546 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:11,547 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:11,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:11,547 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 [2018-10-27 04:14:11,556 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:11,557 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:11,600 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:11,600 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:11,603 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:11,681 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:11,681 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:11,986 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:12,008 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:12,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 04:14:12,009 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:12,009 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 04:14:12,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 04:14:12,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-27 04:14:12,011 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 14 states. [2018-10-27 04:14:12,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:12,064 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-27 04:14:12,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 04:14:12,065 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2018-10-27 04:14:12,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:12,067 INFO L225 Difference]: With dead ends: 48 [2018-10-27 04:14:12,067 INFO L226 Difference]: Without dead ends: 43 [2018-10-27 04:14:12,068 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-27 04:14:12,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-27 04:14:12,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-27 04:14:12,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 04:14:12,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-27 04:14:12,074 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-27 04:14:12,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:12,074 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-27 04:14:12,074 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 04:14:12,075 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-27 04:14:12,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 04:14:12,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:12,076 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:12,076 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:12,076 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:12,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1381705981, now seen corresponding path program 10 times [2018-10-27 04:14:12,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:12,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:12,077 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:12,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:12,078 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:12,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:12,496 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:12,496 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:12,496 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:12,497 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:12,497 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:12,497 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:12,497 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 [2018-10-27 04:14:12,506 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:12,506 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:12,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:12,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:12,633 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:12,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:13,035 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:13,058 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:13,058 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 04:14:13,058 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:13,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 04:14:13,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 04:14:13,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=470, Unknown=0, NotChecked=0, Total=756 [2018-10-27 04:14:13,060 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 15 states. [2018-10-27 04:14:13,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:13,113 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 04:14:13,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 04:14:13,114 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 41 [2018-10-27 04:14:13,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:13,115 INFO L225 Difference]: With dead ends: 51 [2018-10-27 04:14:13,115 INFO L226 Difference]: Without dead ends: 46 [2018-10-27 04:14:13,116 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2018-10-27 04:14:13,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-27 04:14:13,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-27 04:14:13,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-27 04:14:13,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-27 04:14:13,122 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-27 04:14:13,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:13,122 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-27 04:14:13,122 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 04:14:13,122 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-27 04:14:13,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-27 04:14:13,123 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:13,123 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:13,123 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:13,124 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:13,124 INFO L82 PathProgramCache]: Analyzing trace with hash 75574909, now seen corresponding path program 11 times [2018-10-27 04:14:13,124 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:13,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:13,125 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:13,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:13,125 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:13,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:13,430 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:13,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:13,430 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:13,430 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:13,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:13,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:13,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 04:14:13,438 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:13,438 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:13,515 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 04:14:13,515 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:13,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:13,733 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:13,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:14,049 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:14,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:14,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 04:14:14,070 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:14,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 04:14:14,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 04:14:14,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=535, Unknown=0, NotChecked=0, Total=870 [2018-10-27 04:14:14,071 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 16 states. [2018-10-27 04:14:14,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:14,152 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-27 04:14:14,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 04:14:14,152 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2018-10-27 04:14:14,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:14,153 INFO L225 Difference]: With dead ends: 54 [2018-10-27 04:14:14,153 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 04:14:14,154 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=341, Invalid=589, Unknown=0, NotChecked=0, Total=930 [2018-10-27 04:14:14,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 04:14:14,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-27 04:14:14,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 04:14:14,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-27 04:14:14,160 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-27 04:14:14,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:14,160 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-27 04:14:14,160 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 04:14:14,160 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-27 04:14:14,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 04:14:14,161 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:14,161 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:14,161 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:14,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:14,162 INFO L82 PathProgramCache]: Analyzing trace with hash 1528510717, now seen corresponding path program 12 times [2018-10-27 04:14:14,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:14,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:14,163 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:14,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:14,163 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:14,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:14,482 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:14,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:14,482 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:14,482 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:14,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:14,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:14,483 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 [2018-10-27 04:14:14,492 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:14,492 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:14,527 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:14,528 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:14,531 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:14,616 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:14,616 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:14,968 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:14,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:14,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 04:14:14,989 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:14,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 04:14:14,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 04:14:14,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=604, Unknown=0, NotChecked=0, Total=992 [2018-10-27 04:14:14,991 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 17 states. [2018-10-27 04:14:15,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:15,055 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 04:14:15,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 04:14:15,058 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 47 [2018-10-27 04:14:15,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:15,059 INFO L225 Difference]: With dead ends: 57 [2018-10-27 04:14:15,059 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 04:14:15,062 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 04:14:15,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 04:14:15,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-27 04:14:15,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-27 04:14:15,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-27 04:14:15,070 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-27 04:14:15,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:15,070 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-27 04:14:15,070 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 04:14:15,070 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-27 04:14:15,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-27 04:14:15,073 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:15,074 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:15,074 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:15,074 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:15,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1258757757, now seen corresponding path program 13 times [2018-10-27 04:14:15,074 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:15,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:15,075 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:15,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:15,076 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:15,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:15,387 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:15,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:15,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:15,388 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:15,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:15,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:15,388 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 [2018-10-27 04:14:15,398 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:15,398 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:15,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:15,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:15,504 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:15,504 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:15,859 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:15,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:15,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 04:14:15,880 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:15,880 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 04:14:15,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 04:14:15,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=677, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 04:14:15,881 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 18 states. [2018-10-27 04:14:15,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:15,936 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-27 04:14:15,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 04:14:15,936 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2018-10-27 04:14:15,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:15,938 INFO L225 Difference]: With dead ends: 60 [2018-10-27 04:14:15,938 INFO L226 Difference]: Without dead ends: 55 [2018-10-27 04:14:15,939 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=451, Invalid=739, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 04:14:15,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-27 04:14:15,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-27 04:14:15,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 04:14:15,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-27 04:14:15,945 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-27 04:14:15,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:15,946 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-27 04:14:15,946 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 04:14:15,946 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-27 04:14:15,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 04:14:15,947 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:15,947 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:15,947 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:15,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:15,948 INFO L82 PathProgramCache]: Analyzing trace with hash 932137213, now seen corresponding path program 14 times [2018-10-27 04:14:15,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:15,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:15,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:15,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:15,949 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:15,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:16,167 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:16,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:16,168 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:16,168 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:16,168 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:16,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:16,168 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 [2018-10-27 04:14:16,178 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:16,178 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:16,211 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 04:14:16,211 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:16,214 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:16,346 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:16,346 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:17,226 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:17,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:17,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 04:14:17,246 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:17,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 04:14:17,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 04:14:17,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=754, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 04:14:17,248 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 19 states. [2018-10-27 04:14:17,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:17,337 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-27 04:14:17,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 04:14:17,337 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 53 [2018-10-27 04:14:17,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:17,338 INFO L225 Difference]: With dead ends: 63 [2018-10-27 04:14:17,338 INFO L226 Difference]: Without dead ends: 58 [2018-10-27 04:14:17,339 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 04:14:17,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-27 04:14:17,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-27 04:14:17,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-27 04:14:17,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-27 04:14:17,346 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-27 04:14:17,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:17,346 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-27 04:14:17,346 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 04:14:17,346 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-27 04:14:17,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-27 04:14:17,353 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:17,354 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:17,356 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:17,356 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:17,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1319563651, now seen corresponding path program 15 times [2018-10-27 04:14:17,356 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:17,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:17,357 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:17,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:17,358 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:17,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:17,935 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:17,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:17,935 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:17,935 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:17,936 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:17,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:17,936 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 [2018-10-27 04:14:17,946 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:17,946 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:17,974 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:17,974 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:17,976 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:18,084 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:18,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:19,080 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:19,102 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:19,102 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 04:14:19,102 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:19,102 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 04:14:19,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 04:14:19,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=571, Invalid=835, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 04:14:19,104 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 20 states. [2018-10-27 04:14:19,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:19,305 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-27 04:14:19,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 04:14:19,305 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 56 [2018-10-27 04:14:19,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:19,306 INFO L225 Difference]: With dead ends: 66 [2018-10-27 04:14:19,306 INFO L226 Difference]: Without dead ends: 61 [2018-10-27 04:14:19,307 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=577, Invalid=905, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 04:14:19,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-27 04:14:19,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-27 04:14:19,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-27 04:14:19,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-27 04:14:19,314 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-27 04:14:19,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:19,317 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-27 04:14:19,317 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 04:14:19,317 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-27 04:14:19,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-27 04:14:19,318 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:19,318 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:19,318 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:19,319 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:19,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1354193149, now seen corresponding path program 16 times [2018-10-27 04:14:19,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:19,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:19,320 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:19,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:19,322 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:19,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:19,636 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:19,636 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:19,636 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:19,637 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:19,637 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:19,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:19,637 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 [2018-10-27 04:14:19,644 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:19,644 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:19,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:19,678 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:19,743 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:19,743 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:20,992 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:21,013 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:21,013 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 04:14:21,013 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:21,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 04:14:21,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 04:14:21,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=920, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 04:14:21,014 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 21 states. [2018-10-27 04:14:21,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:21,064 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-27 04:14:21,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 04:14:21,065 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 59 [2018-10-27 04:14:21,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:21,066 INFO L225 Difference]: With dead ends: 69 [2018-10-27 04:14:21,066 INFO L226 Difference]: Without dead ends: 64 [2018-10-27 04:14:21,067 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=646, Invalid=994, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 04:14:21,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-27 04:14:21,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-27 04:14:21,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-27 04:14:21,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-27 04:14:21,072 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-27 04:14:21,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:21,072 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-27 04:14:21,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 04:14:21,072 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-27 04:14:21,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-27 04:14:21,073 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:21,073 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:21,073 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:21,074 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:21,074 INFO L82 PathProgramCache]: Analyzing trace with hash 779550333, now seen corresponding path program 17 times [2018-10-27 04:14:21,074 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:21,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:21,075 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:21,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:21,075 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:21,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:22,106 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:22,106 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:22,106 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:22,106 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:22,107 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:22,107 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:22,107 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 [2018-10-27 04:14:22,113 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:22,114 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:22,150 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 04:14:22,150 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:22,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:22,195 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:22,195 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:22,653 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:22,674 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:22,674 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 04:14:22,674 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:22,675 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 04:14:22,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 04:14:22,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=1009, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 04:14:22,676 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 22 states. [2018-10-27 04:14:22,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:22,728 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-27 04:14:22,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 04:14:22,728 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 62 [2018-10-27 04:14:22,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:22,729 INFO L225 Difference]: With dead ends: 72 [2018-10-27 04:14:22,729 INFO L226 Difference]: Without dead ends: 67 [2018-10-27 04:14:22,731 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=719, Invalid=1087, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 04:14:22,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-27 04:14:22,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-27 04:14:22,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-27 04:14:22,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-27 04:14:22,735 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-27 04:14:22,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:22,736 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-27 04:14:22,736 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 04:14:22,736 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-27 04:14:22,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-27 04:14:22,737 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:22,737 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:22,737 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:22,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:22,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1335060733, now seen corresponding path program 18 times [2018-10-27 04:14:22,738 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:22,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:22,738 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:22,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:22,739 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:22,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:23,178 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:23,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:23,178 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:23,178 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:23,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:23,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:23,178 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 [2018-10-27 04:14:23,187 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:23,187 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:23,220 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:23,220 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:23,222 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:23,246 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:23,246 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:23,750 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:23,771 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:23,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 04:14:23,771 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:23,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 04:14:23,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 04:14:23,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=790, Invalid=1102, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 04:14:23,773 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 23 states. [2018-10-27 04:14:23,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:23,830 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-27 04:14:23,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 04:14:23,831 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2018-10-27 04:14:23,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:23,832 INFO L225 Difference]: With dead ends: 75 [2018-10-27 04:14:23,832 INFO L226 Difference]: Without dead ends: 70 [2018-10-27 04:14:23,833 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=796, Invalid=1184, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 04:14:23,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-27 04:14:23,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-27 04:14:23,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-27 04:14:23,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-27 04:14:23,838 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-27 04:14:23,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:23,838 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-27 04:14:23,838 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 04:14:23,838 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-27 04:14:23,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-27 04:14:23,839 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:23,839 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:23,839 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:23,839 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:23,839 INFO L82 PathProgramCache]: Analyzing trace with hash 2036395645, now seen corresponding path program 19 times [2018-10-27 04:14:23,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:23,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:23,840 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:23,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:23,841 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:23,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:24,208 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:24,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:24,209 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:24,209 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:24,209 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:24,209 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:24,209 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 [2018-10-27 04:14:24,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:24,218 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:24,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:24,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:24,308 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:24,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:24,821 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:24,844 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:24,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-27 04:14:24,844 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:24,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 04:14:24,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 04:14:24,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=871, Invalid=1199, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 04:14:24,845 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 24 states. [2018-10-27 04:14:24,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:24,915 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-27 04:14:24,915 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 04:14:24,915 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 68 [2018-10-27 04:14:24,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:24,916 INFO L225 Difference]: With dead ends: 78 [2018-10-27 04:14:24,916 INFO L226 Difference]: Without dead ends: 73 [2018-10-27 04:14:24,917 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=877, Invalid=1285, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 04:14:24,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-27 04:14:24,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-27 04:14:24,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-27 04:14:24,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-27 04:14:24,919 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-27 04:14:24,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:24,920 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-27 04:14:24,920 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 04:14:24,920 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-27 04:14:24,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-27 04:14:24,921 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:24,921 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:24,921 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:24,921 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:24,921 INFO L82 PathProgramCache]: Analyzing trace with hash 488863997, now seen corresponding path program 20 times [2018-10-27 04:14:24,921 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:24,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:24,922 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:24,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:24,922 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:24,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:25,334 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:25,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:25,334 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:25,334 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:25,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:25,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:25,335 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 [2018-10-27 04:14:25,345 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:25,345 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:25,390 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 04:14:25,391 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:25,397 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:25,443 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:25,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:26,555 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:26,576 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:26,576 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-27 04:14:26,576 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:26,576 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 04:14:26,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 04:14:26,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=1300, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 04:14:26,577 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 25 states. [2018-10-27 04:14:26,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:26,654 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-27 04:14:26,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 04:14:26,658 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 71 [2018-10-27 04:14:26,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:26,658 INFO L225 Difference]: With dead ends: 81 [2018-10-27 04:14:26,658 INFO L226 Difference]: Without dead ends: 76 [2018-10-27 04:14:26,659 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=962, Invalid=1390, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 04:14:26,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-27 04:14:26,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-27 04:14:26,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-27 04:14:26,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-27 04:14:26,662 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-27 04:14:26,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:26,663 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-27 04:14:26,663 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 04:14:26,663 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-27 04:14:26,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-27 04:14:26,664 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:26,664 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:26,664 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:26,664 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:26,664 INFO L82 PathProgramCache]: Analyzing trace with hash 152493693, now seen corresponding path program 21 times [2018-10-27 04:14:26,664 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:26,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:26,666 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:26,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:26,666 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:26,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:26,999 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:26,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:26,999 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:26,999 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:27,000 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:27,000 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:27,000 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 [2018-10-27 04:14:27,007 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:27,007 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:27,049 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:27,050 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:27,052 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:27,086 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:27,086 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:27,750 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:27,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:27,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-27 04:14:27,770 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:27,771 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 04:14:27,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 04:14:27,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1045, Invalid=1405, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 04:14:27,772 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 26 states. [2018-10-27 04:14:27,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:27,959 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-27 04:14:27,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 04:14:27,960 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 74 [2018-10-27 04:14:27,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:27,961 INFO L225 Difference]: With dead ends: 84 [2018-10-27 04:14:27,961 INFO L226 Difference]: Without dead ends: 79 [2018-10-27 04:14:27,963 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1051, Invalid=1499, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 04:14:27,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-27 04:14:27,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-10-27 04:14:27,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-27 04:14:27,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-10-27 04:14:27,965 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-10-27 04:14:27,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:27,966 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-10-27 04:14:27,966 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 04:14:27,966 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-10-27 04:14:27,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-27 04:14:27,966 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:27,967 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:27,967 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:27,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:27,967 INFO L82 PathProgramCache]: Analyzing trace with hash -496531203, now seen corresponding path program 22 times [2018-10-27 04:14:27,967 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:27,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:27,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:27,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:27,968 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:27,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:28,528 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:28,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:28,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:28,528 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:28,528 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:28,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:28,529 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 [2018-10-27 04:14:28,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:28,537 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:28,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:28,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:28,635 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:28,635 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:29,295 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:29,315 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:29,315 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-27 04:14:29,315 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:29,316 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 04:14:29,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 04:14:29,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1138, Invalid=1514, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 04:14:29,317 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 27 states. [2018-10-27 04:14:29,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:29,377 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-27 04:14:29,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-27 04:14:29,377 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 77 [2018-10-27 04:14:29,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:29,378 INFO L225 Difference]: With dead ends: 87 [2018-10-27 04:14:29,378 INFO L226 Difference]: Without dead ends: 82 [2018-10-27 04:14:29,380 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1144, Invalid=1612, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 04:14:29,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-27 04:14:29,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-10-27 04:14:29,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-27 04:14:29,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-10-27 04:14:29,383 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 77 [2018-10-27 04:14:29,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:29,383 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-10-27 04:14:29,383 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 04:14:29,383 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-10-27 04:14:29,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-27 04:14:29,384 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:29,384 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:29,384 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:29,384 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:29,384 INFO L82 PathProgramCache]: Analyzing trace with hash 345558653, now seen corresponding path program 23 times [2018-10-27 04:14:29,385 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:29,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:29,385 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:29,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:29,386 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:29,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:30,360 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:30,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:30,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:30,361 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:30,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:30,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:30,361 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 [2018-10-27 04:14:30,371 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:30,371 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:30,421 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-27 04:14:30,421 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:30,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:30,793 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:30,794 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:31,808 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:31,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:31,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2018-10-27 04:14:31,828 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:31,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 04:14:31,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 04:14:31,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1235, Invalid=1627, Unknown=0, NotChecked=0, Total=2862 [2018-10-27 04:14:31,830 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 28 states. [2018-10-27 04:14:31,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:31,909 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-27 04:14:31,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 04:14:31,911 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 80 [2018-10-27 04:14:31,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:31,913 INFO L225 Difference]: With dead ends: 90 [2018-10-27 04:14:31,913 INFO L226 Difference]: Without dead ends: 85 [2018-10-27 04:14:31,914 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1241, Invalid=1729, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 04:14:31,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-27 04:14:31,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2018-10-27 04:14:31,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-27 04:14:31,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-10-27 04:14:31,930 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 80 [2018-10-27 04:14:31,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:31,931 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-10-27 04:14:31,931 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 04:14:31,931 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-10-27 04:14:31,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-27 04:14:31,932 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:31,932 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:31,932 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:31,932 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:31,933 INFO L82 PathProgramCache]: Analyzing trace with hash 140482813, now seen corresponding path program 24 times [2018-10-27 04:14:31,933 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:31,934 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:31,934 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:31,934 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:31,935 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:31,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:32,335 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:32,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:32,336 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:32,336 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:32,336 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:32,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:32,336 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 [2018-10-27 04:14:32,345 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:32,345 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:32,396 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:32,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:32,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:32,455 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:32,455 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:33,556 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:33,576 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:33,577 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-27 04:14:33,577 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:33,577 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 04:14:33,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 04:14:33,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 04:14:33,579 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 29 states. [2018-10-27 04:14:33,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:33,646 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-27 04:14:33,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 04:14:33,646 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 83 [2018-10-27 04:14:33,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:33,648 INFO L225 Difference]: With dead ends: 93 [2018-10-27 04:14:33,648 INFO L226 Difference]: Without dead ends: 88 [2018-10-27 04:14:33,649 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 04:14:33,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-27 04:14:33,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-10-27 04:14:33,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-27 04:14:33,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-10-27 04:14:33,653 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 83 [2018-10-27 04:14:33,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:33,653 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-10-27 04:14:33,653 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 04:14:33,653 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-10-27 04:14:33,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-27 04:14:33,654 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:33,654 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:33,654 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:33,654 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:33,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1830371715, now seen corresponding path program 25 times [2018-10-27 04:14:33,655 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:33,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:33,655 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:33,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:33,655 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:33,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:34,110 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:34,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:34,111 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:34,111 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:34,111 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:34,111 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:34,111 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 [2018-10-27 04:14:34,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:34,118 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:34,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:34,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:34,241 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:34,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:35,072 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:35,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:35,092 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-27 04:14:35,092 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:35,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 04:14:35,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 04:14:35,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1441, Invalid=1865, Unknown=0, NotChecked=0, Total=3306 [2018-10-27 04:14:35,094 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 30 states. [2018-10-27 04:14:35,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:35,203 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-27 04:14:35,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 04:14:35,204 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 86 [2018-10-27 04:14:35,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:35,205 INFO L225 Difference]: With dead ends: 96 [2018-10-27 04:14:35,206 INFO L226 Difference]: Without dead ends: 91 [2018-10-27 04:14:35,207 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1447, Invalid=1975, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 04:14:35,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-27 04:14:35,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-27 04:14:35,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-27 04:14:35,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-10-27 04:14:35,211 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 86 [2018-10-27 04:14:35,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:35,211 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-10-27 04:14:35,211 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 04:14:35,211 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-10-27 04:14:35,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-27 04:14:35,212 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:35,212 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:35,212 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:35,212 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:35,212 INFO L82 PathProgramCache]: Analyzing trace with hash 940288253, now seen corresponding path program 26 times [2018-10-27 04:14:35,213 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:35,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:35,213 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:35,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:35,214 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:35,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:35,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:35,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:35,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:35,774 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:35,774 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:35,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:35,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:35,782 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:35,782 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:35,836 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-27 04:14:35,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:35,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:35,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:35,903 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:37,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:37,278 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:37,278 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2018-10-27 04:14:37,278 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:37,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 04:14:37,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 04:14:37,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1550, Invalid=1990, Unknown=0, NotChecked=0, Total=3540 [2018-10-27 04:14:37,279 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 31 states. [2018-10-27 04:14:37,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:37,351 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-27 04:14:37,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 04:14:37,351 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 89 [2018-10-27 04:14:37,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:37,352 INFO L225 Difference]: With dead ends: 99 [2018-10-27 04:14:37,352 INFO L226 Difference]: Without dead ends: 94 [2018-10-27 04:14:37,353 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1556, Invalid=2104, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 04:14:37,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-27 04:14:37,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-10-27 04:14:37,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-27 04:14:37,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-10-27 04:14:37,357 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 89 [2018-10-27 04:14:37,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:37,358 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-10-27 04:14:37,358 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 04:14:37,358 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-10-27 04:14:37,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-27 04:14:37,358 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:37,358 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:37,359 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:37,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:37,359 INFO L82 PathProgramCache]: Analyzing trace with hash 989900413, now seen corresponding path program 27 times [2018-10-27 04:14:37,359 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:37,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:37,359 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:37,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:37,360 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:37,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:37,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:37,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:37,922 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:37,922 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:37,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:37,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:37,922 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:37,931 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:37,931 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:37,975 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:37,975 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:37,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:38,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:38,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:39,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:39,484 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:39,484 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-27 04:14:39,484 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:39,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 04:14:39,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 04:14:39,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1663, Invalid=2119, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 04:14:39,485 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 32 states. [2018-10-27 04:14:39,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:39,602 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-27 04:14:39,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 04:14:39,602 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 92 [2018-10-27 04:14:39,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:39,603 INFO L225 Difference]: With dead ends: 102 [2018-10-27 04:14:39,603 INFO L226 Difference]: Without dead ends: 97 [2018-10-27 04:14:39,603 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 154 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1669, Invalid=2237, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 04:14:39,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-27 04:14:39,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2018-10-27 04:14:39,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-27 04:14:39,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-10-27 04:14:39,608 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 92 [2018-10-27 04:14:39,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:39,608 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-10-27 04:14:39,608 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 04:14:39,608 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-10-27 04:14:39,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-27 04:14:39,609 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:39,609 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:39,609 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:39,609 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:39,610 INFO L82 PathProgramCache]: Analyzing trace with hash 1517009149, now seen corresponding path program 28 times [2018-10-27 04:14:39,610 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:39,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:39,610 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:39,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:39,611 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:39,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:40,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:40,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:40,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:40,657 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:40,658 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:40,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:40,658 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:40,666 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:40,666 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:40,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:40,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:40,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:40,752 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:41,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:41,797 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:41,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2018-10-27 04:14:41,797 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:41,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 04:14:41,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 04:14:41,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1780, Invalid=2252, Unknown=0, NotChecked=0, Total=4032 [2018-10-27 04:14:41,799 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 33 states. [2018-10-27 04:14:41,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:41,896 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-27 04:14:41,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-27 04:14:41,904 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 95 [2018-10-27 04:14:41,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:41,905 INFO L225 Difference]: With dead ends: 105 [2018-10-27 04:14:41,905 INFO L226 Difference]: Without dead ends: 100 [2018-10-27 04:14:41,906 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1786, Invalid=2374, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 04:14:41,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-27 04:14:41,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-10-27 04:14:41,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-27 04:14:41,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-10-27 04:14:41,909 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 95 [2018-10-27 04:14:41,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:41,910 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-10-27 04:14:41,910 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 04:14:41,910 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-10-27 04:14:41,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-27 04:14:41,910 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:41,910 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:41,911 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:41,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:41,911 INFO L82 PathProgramCache]: Analyzing trace with hash -2082038147, now seen corresponding path program 29 times [2018-10-27 04:14:41,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:41,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:41,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:41,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:41,912 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:41,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:42,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:42,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:42,546 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:42,546 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:42,547 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:42,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:42,547 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:42,554 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:42,554 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:42,617 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-27 04:14:42,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:42,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:42,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:42,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:44,062 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:44,082 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:44,082 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2018-10-27 04:14:44,082 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:44,083 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 04:14:44,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 04:14:44,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=2389, Unknown=0, NotChecked=0, Total=4290 [2018-10-27 04:14:44,084 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 34 states. [2018-10-27 04:14:44,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:44,202 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-27 04:14:44,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 04:14:44,202 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 98 [2018-10-27 04:14:44,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:44,203 INFO L225 Difference]: With dead ends: 108 [2018-10-27 04:14:44,204 INFO L226 Difference]: Without dead ends: 103 [2018-10-27 04:14:44,205 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1907, Invalid=2515, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 04:14:44,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-27 04:14:44,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-27 04:14:44,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-27 04:14:44,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-10-27 04:14:44,208 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 98 [2018-10-27 04:14:44,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:44,208 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-10-27 04:14:44,208 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 04:14:44,208 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-10-27 04:14:44,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-27 04:14:44,209 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:44,209 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:44,209 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:44,209 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:44,210 INFO L82 PathProgramCache]: Analyzing trace with hash -1736455939, now seen corresponding path program 30 times [2018-10-27 04:14:44,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:44,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:44,210 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:44,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:44,211 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:44,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:44,724 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:44,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:44,725 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:44,725 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:44,725 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:44,725 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:44,725 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:44,733 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:44,733 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:44,786 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:44,786 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:44,789 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:44,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:44,852 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:46,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:46,037 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:46,037 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-27 04:14:46,037 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:46,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 04:14:46,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 04:14:46,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2026, Invalid=2530, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 04:14:46,039 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 35 states. [2018-10-27 04:14:46,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:46,178 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-27 04:14:46,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 04:14:46,178 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 101 [2018-10-27 04:14:46,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:46,179 INFO L225 Difference]: With dead ends: 111 [2018-10-27 04:14:46,179 INFO L226 Difference]: Without dead ends: 106 [2018-10-27 04:14:46,180 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 169 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 04:14:46,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-27 04:14:46,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-10-27 04:14:46,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-27 04:14:46,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2018-10-27 04:14:46,183 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 101 [2018-10-27 04:14:46,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:46,183 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2018-10-27 04:14:46,183 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 04:14:46,184 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2018-10-27 04:14:46,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-27 04:14:46,184 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:46,184 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:46,185 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:46,185 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:46,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1533505923, now seen corresponding path program 31 times [2018-10-27 04:14:46,185 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:46,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:46,186 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:46,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:46,186 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:46,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:46,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:46,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:46,861 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:46,861 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:46,861 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:46,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:46,861 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:46,870 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:46,870 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:46,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:46,926 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:46,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:46,996 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:48,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:48,704 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:48,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 70 [2018-10-27 04:14:48,705 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:48,705 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 04:14:48,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 04:14:48,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2155, Invalid=2675, Unknown=0, NotChecked=0, Total=4830 [2018-10-27 04:14:48,706 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 36 states. [2018-10-27 04:14:48,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:48,871 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-27 04:14:48,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-27 04:14:48,872 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 104 [2018-10-27 04:14:48,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:48,873 INFO L225 Difference]: With dead ends: 114 [2018-10-27 04:14:48,873 INFO L226 Difference]: Without dead ends: 109 [2018-10-27 04:14:48,874 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2161, Invalid=2809, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 04:14:48,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-27 04:14:48,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2018-10-27 04:14:48,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-27 04:14:48,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-10-27 04:14:48,878 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 104 [2018-10-27 04:14:48,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:48,878 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-10-27 04:14:48,878 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 04:14:48,879 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-10-27 04:14:48,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-27 04:14:48,879 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:48,879 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:48,880 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:48,880 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:48,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1531435261, now seen corresponding path program 32 times [2018-10-27 04:14:48,880 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:48,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:48,881 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:48,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:48,881 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:48,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:50,399 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:50,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:50,399 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:50,400 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:50,400 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:50,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:50,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:50,407 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:50,408 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:50,481 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-27 04:14:50,481 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:50,485 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:50,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:50,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:51,884 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:51,904 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:51,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 72 [2018-10-27 04:14:51,905 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:51,905 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 04:14:51,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 04:14:51,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2288, Invalid=2824, Unknown=0, NotChecked=0, Total=5112 [2018-10-27 04:14:51,906 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 37 states. [2018-10-27 04:14:51,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:51,975 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-27 04:14:51,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 04:14:51,976 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 107 [2018-10-27 04:14:51,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:51,977 INFO L225 Difference]: With dead ends: 117 [2018-10-27 04:14:51,977 INFO L226 Difference]: Without dead ends: 112 [2018-10-27 04:14:51,978 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 179 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2294, Invalid=2962, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 04:14:51,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-27 04:14:51,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-27 04:14:51,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-27 04:14:51,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-10-27 04:14:51,982 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 107 [2018-10-27 04:14:51,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:51,982 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-10-27 04:14:51,982 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 04:14:51,983 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-10-27 04:14:51,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-27 04:14:51,983 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:51,983 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:51,984 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:51,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:51,984 INFO L82 PathProgramCache]: Analyzing trace with hash -1810465155, now seen corresponding path program 33 times [2018-10-27 04:14:51,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:51,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:51,985 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:51,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:51,985 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:52,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:52,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:52,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:52,681 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:52,681 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:52,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:52,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:52,682 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:52,688 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:14:52,689 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:14:52,744 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:14:52,745 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:52,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:52,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:52,777 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:54,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:54,545 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:54,545 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-27 04:14:54,545 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:54,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 04:14:54,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 04:14:54,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 04:14:54,546 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 38 states. [2018-10-27 04:14:54,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:54,629 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-27 04:14:54,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 04:14:54,630 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 110 [2018-10-27 04:14:54,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:54,631 INFO L225 Difference]: With dead ends: 120 [2018-10-27 04:14:54,631 INFO L226 Difference]: Without dead ends: 115 [2018-10-27 04:14:54,631 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 184 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2431, Invalid=3119, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 04:14:54,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-27 04:14:54,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-10-27 04:14:54,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-27 04:14:54,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-10-27 04:14:54,636 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 110 [2018-10-27 04:14:54,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:54,636 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-10-27 04:14:54,636 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 04:14:54,636 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-10-27 04:14:54,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-27 04:14:54,637 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:54,637 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:54,637 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:54,637 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:54,637 INFO L82 PathProgramCache]: Analyzing trace with hash 1271130365, now seen corresponding path program 34 times [2018-10-27 04:14:54,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:54,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:54,638 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:14:54,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:54,639 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:54,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:55,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:55,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:55,210 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:55,210 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:55,210 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:55,210 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:55,210 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:55,218 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:55,218 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:14:55,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:55,280 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:55,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:55,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:14:56,769 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:56,790 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:14:56,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-10-27 04:14:56,790 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:14:56,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 04:14:56,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 04:14:56,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2566, Invalid=3134, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 04:14:56,792 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 39 states. [2018-10-27 04:14:56,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:14:56,902 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-27 04:14:56,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 04:14:56,903 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 113 [2018-10-27 04:14:56,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:14:56,904 INFO L225 Difference]: With dead ends: 123 [2018-10-27 04:14:56,904 INFO L226 Difference]: Without dead ends: 118 [2018-10-27 04:14:56,905 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2572, Invalid=3280, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 04:14:56,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-27 04:14:56,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-10-27 04:14:56,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-27 04:14:56,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2018-10-27 04:14:56,909 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 113 [2018-10-27 04:14:56,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:14:56,909 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2018-10-27 04:14:56,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 04:14:56,909 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2018-10-27 04:14:56,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-27 04:14:56,909 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:14:56,910 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:14:56,910 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:14:56,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:14:56,910 INFO L82 PathProgramCache]: Analyzing trace with hash 157314685, now seen corresponding path program 35 times [2018-10-27 04:14:56,910 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:14:56,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:56,911 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:14:56,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:14:56,911 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:14:56,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:14:57,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:57,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:57,678 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:14:57,678 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:14:57,678 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:14:57,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:14:57,678 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:14:57,685 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:14:57,685 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:14:57,765 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-27 04:14:57,765 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:14:57,768 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:14:58,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:14:58,274 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:00,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:00,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:00,542 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 78 [2018-10-27 04:15:00,542 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:00,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 04:15:00,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 04:15:00,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2711, Invalid=3295, Unknown=0, NotChecked=0, Total=6006 [2018-10-27 04:15:00,543 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 40 states. [2018-10-27 04:15:00,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:00,631 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-27 04:15:00,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 04:15:00,632 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 116 [2018-10-27 04:15:00,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:00,634 INFO L225 Difference]: With dead ends: 126 [2018-10-27 04:15:00,634 INFO L226 Difference]: Without dead ends: 121 [2018-10-27 04:15:00,634 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 194 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2717, Invalid=3445, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 04:15:00,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-27 04:15:00,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-10-27 04:15:00,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-27 04:15:00,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-10-27 04:15:00,638 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 116 [2018-10-27 04:15:00,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:00,638 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-10-27 04:15:00,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 04:15:00,638 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-10-27 04:15:00,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-27 04:15:00,639 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:00,639 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:00,640 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:00,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:00,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1391720701, now seen corresponding path program 36 times [2018-10-27 04:15:00,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:00,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:00,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:00,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:00,641 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:00,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:01,655 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:01,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:01,655 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:01,656 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:01,656 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:01,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:01,656 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:01,663 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:15:01,663 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:15:01,726 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:15:01,726 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:01,729 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:02,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:02,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:03,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:03,883 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:03,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-27 04:15:03,884 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:03,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 04:15:03,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 04:15:03,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2860, Invalid=3460, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 04:15:03,885 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 41 states. [2018-10-27 04:15:04,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:04,027 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-27 04:15:04,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 04:15:04,027 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 119 [2018-10-27 04:15:04,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:04,028 INFO L225 Difference]: With dead ends: 129 [2018-10-27 04:15:04,028 INFO L226 Difference]: Without dead ends: 124 [2018-10-27 04:15:04,029 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2866, Invalid=3614, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 04:15:04,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-27 04:15:04,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-10-27 04:15:04,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-27 04:15:04,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-10-27 04:15:04,032 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 119 [2018-10-27 04:15:04,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:04,032 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-10-27 04:15:04,032 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 04:15:04,032 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-10-27 04:15:04,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-27 04:15:04,033 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:04,033 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:04,033 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:04,034 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:04,034 INFO L82 PathProgramCache]: Analyzing trace with hash 2071355005, now seen corresponding path program 37 times [2018-10-27 04:15:04,034 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:04,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:04,035 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:04,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:04,035 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:04,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:04,901 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:04,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:04,902 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:04,902 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:04,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:04,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:04,902 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:04,911 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:04,911 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:15:04,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:04,976 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:05,079 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:05,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:06,748 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:06,767 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:06,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 82 [2018-10-27 04:15:06,768 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:06,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 04:15:06,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 04:15:06,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3013, Invalid=3629, Unknown=0, NotChecked=0, Total=6642 [2018-10-27 04:15:06,769 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 42 states. [2018-10-27 04:15:07,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:07,050 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-27 04:15:07,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-27 04:15:07,051 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 122 [2018-10-27 04:15:07,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:07,053 INFO L225 Difference]: With dead ends: 132 [2018-10-27 04:15:07,053 INFO L226 Difference]: Without dead ends: 127 [2018-10-27 04:15:07,053 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 204 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3019, Invalid=3787, Unknown=0, NotChecked=0, Total=6806 [2018-10-27 04:15:07,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-27 04:15:07,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2018-10-27 04:15:07,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-27 04:15:07,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-10-27 04:15:07,057 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 122 [2018-10-27 04:15:07,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:07,058 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-10-27 04:15:07,058 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 04:15:07,058 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-10-27 04:15:07,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-27 04:15:07,059 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:07,059 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:07,059 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:07,059 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:07,059 INFO L82 PathProgramCache]: Analyzing trace with hash -1713895171, now seen corresponding path program 38 times [2018-10-27 04:15:07,059 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:07,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:07,060 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:07,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:07,060 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:07,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:08,151 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:08,151 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:08,151 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:08,151 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:08,151 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:08,151 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:08,151 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:08,159 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:15:08,159 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:15:08,245 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-27 04:15:08,245 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:08,248 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:08,332 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:08,332 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:10,238 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:10,258 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:10,259 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 84 [2018-10-27 04:15:10,259 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:10,259 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 04:15:10,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 04:15:10,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3170, Invalid=3802, Unknown=0, NotChecked=0, Total=6972 [2018-10-27 04:15:10,260 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 43 states. [2018-10-27 04:15:10,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:10,406 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-27 04:15:10,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 04:15:10,406 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 125 [2018-10-27 04:15:10,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:10,408 INFO L225 Difference]: With dead ends: 135 [2018-10-27 04:15:10,408 INFO L226 Difference]: Without dead ends: 130 [2018-10-27 04:15:10,409 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 209 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3176, Invalid=3964, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 04:15:10,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-27 04:15:10,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-10-27 04:15:10,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-27 04:15:10,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2018-10-27 04:15:10,413 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 125 [2018-10-27 04:15:10,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:10,413 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2018-10-27 04:15:10,413 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 04:15:10,414 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2018-10-27 04:15:10,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-27 04:15:10,414 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:10,414 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:10,415 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:10,415 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:10,415 INFO L82 PathProgramCache]: Analyzing trace with hash 559435389, now seen corresponding path program 39 times [2018-10-27 04:15:10,415 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:10,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:10,416 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:10,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:10,416 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:10,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:12,142 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:12,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:12,142 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:12,142 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:12,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:12,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:12,143 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:12,149 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:15:12,150 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:15:12,211 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:15:12,212 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:12,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:12,294 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:12,294 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:14,597 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:14,627 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:14,627 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-27 04:15:14,627 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:14,628 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 04:15:14,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 04:15:14,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3331, Invalid=3979, Unknown=0, NotChecked=0, Total=7310 [2018-10-27 04:15:14,629 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 44 states. [2018-10-27 04:15:14,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:14,877 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-10-27 04:15:14,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 04:15:14,878 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 128 [2018-10-27 04:15:14,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:14,880 INFO L225 Difference]: With dead ends: 138 [2018-10-27 04:15:14,880 INFO L226 Difference]: Without dead ends: 133 [2018-10-27 04:15:14,881 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 214 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=3337, Invalid=4145, Unknown=0, NotChecked=0, Total=7482 [2018-10-27 04:15:14,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-27 04:15:14,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2018-10-27 04:15:14,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-27 04:15:14,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-10-27 04:15:14,885 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 128 [2018-10-27 04:15:14,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:14,885 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-10-27 04:15:14,886 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 04:15:14,886 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-10-27 04:15:14,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-27 04:15:14,886 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:14,887 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:14,887 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:14,887 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:14,887 INFO L82 PathProgramCache]: Analyzing trace with hash -1989142275, now seen corresponding path program 40 times [2018-10-27 04:15:14,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:14,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:14,888 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:14,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:14,888 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:14,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:16,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:16,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:16,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:16,092 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:16,092 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:16,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:16,092 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:16,100 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:16,100 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:15:16,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:16,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:16,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:16,309 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:18,233 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:18,264 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:18,264 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 88 [2018-10-27 04:15:18,264 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:18,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 04:15:18,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 04:15:18,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3496, Invalid=4160, Unknown=0, NotChecked=0, Total=7656 [2018-10-27 04:15:18,266 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 45 states. [2018-10-27 04:15:18,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:18,494 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-10-27 04:15:18,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-27 04:15:18,495 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 131 [2018-10-27 04:15:18,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:18,496 INFO L225 Difference]: With dead ends: 141 [2018-10-27 04:15:18,497 INFO L226 Difference]: Without dead ends: 136 [2018-10-27 04:15:18,497 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 219 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3502, Invalid=4330, Unknown=0, NotChecked=0, Total=7832 [2018-10-27 04:15:18,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-27 04:15:18,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-10-27 04:15:18,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-27 04:15:18,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-10-27 04:15:18,501 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 131 [2018-10-27 04:15:18,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:18,502 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-10-27 04:15:18,502 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 04:15:18,502 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-10-27 04:15:18,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-27 04:15:18,503 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:18,503 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:18,503 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:18,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:18,503 INFO L82 PathProgramCache]: Analyzing trace with hash -234471811, now seen corresponding path program 41 times [2018-10-27 04:15:18,504 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:18,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:18,504 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:18,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:18,505 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:18,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:20,153 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:20,153 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:20,153 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:20,154 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:20,154 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:20,154 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:20,154 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:20,161 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:15:20,161 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:15:20,384 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-27 04:15:20,384 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:20,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:20,533 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:20,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:22,601 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:22,622 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:22,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 90 [2018-10-27 04:15:22,623 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:22,623 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-27 04:15:22,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-27 04:15:22,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3665, Invalid=4345, Unknown=0, NotChecked=0, Total=8010 [2018-10-27 04:15:22,624 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 46 states. [2018-10-27 04:15:23,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:23,253 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-10-27 04:15:23,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 04:15:23,254 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 134 [2018-10-27 04:15:23,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:23,255 INFO L225 Difference]: With dead ends: 144 [2018-10-27 04:15:23,255 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 04:15:23,256 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 224 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3671, Invalid=4519, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 04:15:23,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 04:15:23,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-10-27 04:15:23,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-27 04:15:23,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-10-27 04:15:23,261 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 134 [2018-10-27 04:15:23,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:23,261 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-10-27 04:15:23,261 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-27 04:15:23,262 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-10-27 04:15:23,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-27 04:15:23,262 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:23,262 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:23,263 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:23,263 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:23,263 INFO L82 PathProgramCache]: Analyzing trace with hash -893638403, now seen corresponding path program 42 times [2018-10-27 04:15:23,263 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:23,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:23,264 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:23,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:23,264 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:23,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:24,186 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:24,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:24,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:24,186 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:24,186 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:24,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:24,187 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:24,196 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:15:24,196 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:15:24,263 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:15:24,263 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:24,266 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:24,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:24,618 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:26,917 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:26,938 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:26,938 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-27 04:15:26,938 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:26,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 04:15:26,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 04:15:26,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3838, Invalid=4534, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 04:15:26,940 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 47 states. [2018-10-27 04:15:27,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:27,070 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-10-27 04:15:27,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 04:15:27,070 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 137 [2018-10-27 04:15:27,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:27,071 INFO L225 Difference]: With dead ends: 147 [2018-10-27 04:15:27,072 INFO L226 Difference]: Without dead ends: 142 [2018-10-27 04:15:27,072 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 229 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=3844, Invalid=4712, Unknown=0, NotChecked=0, Total=8556 [2018-10-27 04:15:27,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-27 04:15:27,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-10-27 04:15:27,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-27 04:15:27,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2018-10-27 04:15:27,076 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 137 [2018-10-27 04:15:27,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:27,077 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2018-10-27 04:15:27,077 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 04:15:27,077 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2018-10-27 04:15:27,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-27 04:15:27,078 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:27,078 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:27,078 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:27,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:27,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1535103363, now seen corresponding path program 43 times [2018-10-27 04:15:27,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:27,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:27,079 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:27,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:27,080 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:27,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:27,992 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:27,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:27,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:27,993 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:27,993 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:27,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:27,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:28,002 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:28,002 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:15:28,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:28,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:28,136 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:28,136 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:30,656 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:30,677 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:30,677 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-10-27 04:15:30,677 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:30,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 04:15:30,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 04:15:30,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4015, Invalid=4727, Unknown=0, NotChecked=0, Total=8742 [2018-10-27 04:15:30,679 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 48 states. [2018-10-27 04:15:30,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:30,768 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-10-27 04:15:30,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-27 04:15:30,768 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 140 [2018-10-27 04:15:30,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:30,769 INFO L225 Difference]: With dead ends: 150 [2018-10-27 04:15:30,769 INFO L226 Difference]: Without dead ends: 145 [2018-10-27 04:15:30,770 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 234 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4021, Invalid=4909, Unknown=0, NotChecked=0, Total=8930 [2018-10-27 04:15:30,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-27 04:15:30,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2018-10-27 04:15:30,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-27 04:15:30,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-10-27 04:15:30,773 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 140 [2018-10-27 04:15:30,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:30,773 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-10-27 04:15:30,773 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 04:15:30,773 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-10-27 04:15:30,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-27 04:15:30,774 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:30,774 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:30,774 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:30,774 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:30,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1186740477, now seen corresponding path program 44 times [2018-10-27 04:15:30,775 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:30,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:30,775 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:30,775 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:30,775 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:30,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:31,841 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:31,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:31,842 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:31,842 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:31,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:31,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:31,842 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:31,850 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:15:31,850 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:15:31,957 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-10-27 04:15:31,957 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:31,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:32,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:32,028 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:34,357 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:34,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:34,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-10-27 04:15:34,378 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:34,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 04:15:34,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 04:15:34,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4196, Invalid=4924, Unknown=0, NotChecked=0, Total=9120 [2018-10-27 04:15:34,379 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 49 states. [2018-10-27 04:15:35,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:35,220 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-10-27 04:15:35,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 04:15:35,221 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 143 [2018-10-27 04:15:35,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:35,222 INFO L225 Difference]: With dead ends: 153 [2018-10-27 04:15:35,222 INFO L226 Difference]: Without dead ends: 148 [2018-10-27 04:15:35,222 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 239 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4202, Invalid=5110, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 04:15:35,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-27 04:15:35,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-10-27 04:15:35,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-27 04:15:35,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-10-27 04:15:35,226 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 143 [2018-10-27 04:15:35,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:35,227 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-10-27 04:15:35,227 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 04:15:35,227 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-10-27 04:15:35,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-27 04:15:35,228 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:35,228 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:35,228 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:35,228 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:35,228 INFO L82 PathProgramCache]: Analyzing trace with hash -1345970563, now seen corresponding path program 45 times [2018-10-27 04:15:35,229 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:35,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:35,229 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:35,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:35,230 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:35,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:36,166 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:36,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:36,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:36,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:36,167 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:36,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:36,167 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:36,176 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:15:36,176 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:15:36,248 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:15:36,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:36,252 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:36,310 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:36,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:38,743 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:38,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:38,763 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-27 04:15:38,763 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:38,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-27 04:15:38,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-27 04:15:38,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4381, Invalid=5125, Unknown=0, NotChecked=0, Total=9506 [2018-10-27 04:15:38,765 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 50 states. [2018-10-27 04:15:38,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:38,864 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-10-27 04:15:38,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 04:15:38,864 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 146 [2018-10-27 04:15:38,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:38,865 INFO L225 Difference]: With dead ends: 156 [2018-10-27 04:15:38,865 INFO L226 Difference]: Without dead ends: 151 [2018-10-27 04:15:38,866 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 244 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4387, Invalid=5315, Unknown=0, NotChecked=0, Total=9702 [2018-10-27 04:15:38,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-27 04:15:38,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-10-27 04:15:38,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-27 04:15:38,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-10-27 04:15:38,870 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 146 [2018-10-27 04:15:38,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:38,871 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-10-27 04:15:38,871 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-27 04:15:38,871 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-10-27 04:15:38,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-27 04:15:38,872 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:38,872 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:38,872 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:38,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:38,873 INFO L82 PathProgramCache]: Analyzing trace with hash 644892925, now seen corresponding path program 46 times [2018-10-27 04:15:38,873 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:38,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:38,873 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:38,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:38,874 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:38,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:40,387 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:40,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:40,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:40,387 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:40,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:40,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:40,388 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:40,396 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:40,396 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:15:40,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:40,476 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:40,636 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:40,637 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:43,386 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:43,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:43,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 100 [2018-10-27 04:15:43,406 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:43,406 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 04:15:43,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 04:15:43,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4570, Invalid=5330, Unknown=0, NotChecked=0, Total=9900 [2018-10-27 04:15:43,407 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 51 states. [2018-10-27 04:15:43,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:43,531 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-10-27 04:15:43,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-27 04:15:43,532 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 149 [2018-10-27 04:15:43,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:43,532 INFO L225 Difference]: With dead ends: 159 [2018-10-27 04:15:43,532 INFO L226 Difference]: Without dead ends: 154 [2018-10-27 04:15:43,533 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 249 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4576, Invalid=5524, Unknown=0, NotChecked=0, Total=10100 [2018-10-27 04:15:43,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-27 04:15:43,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-10-27 04:15:43,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-27 04:15:43,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2018-10-27 04:15:43,538 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 149 [2018-10-27 04:15:43,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:43,538 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2018-10-27 04:15:43,538 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 04:15:43,538 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2018-10-27 04:15:43,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-27 04:15:43,539 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:43,539 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:43,539 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:43,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:43,539 INFO L82 PathProgramCache]: Analyzing trace with hash 1255673469, now seen corresponding path program 47 times [2018-10-27 04:15:43,540 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:43,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:43,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:43,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:43,540 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:43,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:44,663 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:44,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:44,663 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:44,663 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:44,663 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:44,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:44,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:44,671 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:15:44,671 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:15:44,787 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-27 04:15:44,788 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:44,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:44,909 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:44,909 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:47,598 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:47,618 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:47,618 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 102 [2018-10-27 04:15:47,618 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:47,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-27 04:15:47,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-27 04:15:47,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4763, Invalid=5539, Unknown=0, NotChecked=0, Total=10302 [2018-10-27 04:15:47,620 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 52 states. [2018-10-27 04:15:47,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:47,753 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-10-27 04:15:47,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-27 04:15:47,753 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 152 [2018-10-27 04:15:47,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:47,754 INFO L225 Difference]: With dead ends: 162 [2018-10-27 04:15:47,755 INFO L226 Difference]: Without dead ends: 157 [2018-10-27 04:15:47,756 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 254 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4769, Invalid=5737, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 04:15:47,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-27 04:15:47,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-10-27 04:15:47,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-10-27 04:15:47,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-10-27 04:15:47,760 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 152 [2018-10-27 04:15:47,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:47,760 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-10-27 04:15:47,760 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-27 04:15:47,760 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-10-27 04:15:47,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-27 04:15:47,761 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:47,761 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:47,762 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:47,762 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:47,762 INFO L82 PathProgramCache]: Analyzing trace with hash -757573379, now seen corresponding path program 48 times [2018-10-27 04:15:47,762 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:47,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:47,763 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:47,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:47,763 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:47,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:48,779 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:48,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:48,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:48,780 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:48,780 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:48,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:48,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:48,790 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:15:48,790 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:15:48,872 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:15:48,872 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:48,875 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:48,943 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:48,944 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:51,824 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:51,844 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:51,845 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-27 04:15:51,845 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:51,845 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-27 04:15:51,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-27 04:15:51,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4960, Invalid=5752, Unknown=0, NotChecked=0, Total=10712 [2018-10-27 04:15:51,847 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 53 states. [2018-10-27 04:15:52,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:52,029 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-10-27 04:15:52,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 04:15:52,030 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 155 [2018-10-27 04:15:52,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:52,031 INFO L225 Difference]: With dead ends: 165 [2018-10-27 04:15:52,031 INFO L226 Difference]: Without dead ends: 160 [2018-10-27 04:15:52,032 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 259 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4966, Invalid=5954, Unknown=0, NotChecked=0, Total=10920 [2018-10-27 04:15:52,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-27 04:15:52,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-27 04:15:52,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-27 04:15:52,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-10-27 04:15:52,035 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 155 [2018-10-27 04:15:52,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:52,036 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-10-27 04:15:52,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-27 04:15:52,036 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-10-27 04:15:52,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-27 04:15:52,037 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:52,037 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:52,037 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:52,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:52,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1823866493, now seen corresponding path program 49 times [2018-10-27 04:15:52,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:52,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:52,038 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:15:52,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:52,038 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:52,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:53,114 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:53,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:53,114 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:53,114 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:53,114 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:53,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:53,114 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:53,121 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:53,121 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:15:53,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:53,210 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:53,728 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:53,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:15:56,661 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:56,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:15:56,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 106 [2018-10-27 04:15:56,682 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:15:56,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 04:15:56,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 04:15:56,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5161, Invalid=5969, Unknown=0, NotChecked=0, Total=11130 [2018-10-27 04:15:56,684 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 54 states. [2018-10-27 04:15:56,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:15:56,820 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-10-27 04:15:56,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-27 04:15:56,820 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 158 [2018-10-27 04:15:56,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:15:56,821 INFO L225 Difference]: With dead ends: 168 [2018-10-27 04:15:56,821 INFO L226 Difference]: Without dead ends: 163 [2018-10-27 04:15:56,823 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 264 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5167, Invalid=6175, Unknown=0, NotChecked=0, Total=11342 [2018-10-27 04:15:56,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-27 04:15:56,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2018-10-27 04:15:56,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-27 04:15:56,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-10-27 04:15:56,827 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 158 [2018-10-27 04:15:56,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:15:56,827 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-10-27 04:15:56,827 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 04:15:56,827 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-10-27 04:15:56,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-27 04:15:56,828 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:15:56,828 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:15:56,828 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:15:56,829 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:15:56,829 INFO L82 PathProgramCache]: Analyzing trace with hash -185308931, now seen corresponding path program 50 times [2018-10-27 04:15:56,829 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:15:56,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:56,830 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:15:56,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:15:56,830 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:15:56,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:15:57,935 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:57,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:57,936 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:15:57,936 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:15:57,936 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:15:57,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:15:57,936 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:15:57,945 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:15:57,945 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:15:58,063 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2018-10-27 04:15:58,063 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:15:58,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:15:58,154 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:15:58,154 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:01,132 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:01,153 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:01,153 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 108 [2018-10-27 04:16:01,153 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:01,154 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-27 04:16:01,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-27 04:16:01,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5366, Invalid=6190, Unknown=0, NotChecked=0, Total=11556 [2018-10-27 04:16:01,155 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 55 states. [2018-10-27 04:16:01,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:01,276 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-10-27 04:16:01,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 04:16:01,276 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 161 [2018-10-27 04:16:01,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:01,278 INFO L225 Difference]: With dead ends: 171 [2018-10-27 04:16:01,278 INFO L226 Difference]: Without dead ends: 166 [2018-10-27 04:16:01,279 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 269 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5372, Invalid=6400, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 04:16:01,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-27 04:16:01,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-10-27 04:16:01,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-27 04:16:01,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2018-10-27 04:16:01,295 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 161 [2018-10-27 04:16:01,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:01,295 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2018-10-27 04:16:01,295 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-27 04:16:01,296 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2018-10-27 04:16:01,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-27 04:16:01,296 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:01,296 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:01,296 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:01,297 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:01,297 INFO L82 PathProgramCache]: Analyzing trace with hash -866128259, now seen corresponding path program 51 times [2018-10-27 04:16:01,297 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:01,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:01,297 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:16:01,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:01,298 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:01,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:02,387 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:02,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:02,388 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:02,388 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:02,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:02,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:02,388 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:02,396 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:16:02,396 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:16:02,486 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:16:02,486 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:16:02,489 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:02,576 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:02,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:05,647 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:05,667 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:05,667 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-27 04:16:05,667 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:05,668 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-27 04:16:05,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-27 04:16:05,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5575, Invalid=6415, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 04:16:05,669 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 56 states. [2018-10-27 04:16:05,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:05,827 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-10-27 04:16:05,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-27 04:16:05,828 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 164 [2018-10-27 04:16:05,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:05,829 INFO L225 Difference]: With dead ends: 174 [2018-10-27 04:16:05,829 INFO L226 Difference]: Without dead ends: 169 [2018-10-27 04:16:05,829 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 274 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5581, Invalid=6629, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 04:16:05,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-27 04:16:05,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2018-10-27 04:16:05,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-27 04:16:05,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-10-27 04:16:05,832 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 164 [2018-10-27 04:16:05,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:05,832 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-10-27 04:16:05,832 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-27 04:16:05,832 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-10-27 04:16:05,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-27 04:16:05,833 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:05,833 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:05,833 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:05,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:05,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1975810301, now seen corresponding path program 52 times [2018-10-27 04:16:05,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:05,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:05,834 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:16:05,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:05,834 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:05,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:07,173 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:07,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:07,173 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:07,173 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:07,173 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:07,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:07,173 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:07,181 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:16:07,181 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:16:07,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:07,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:07,337 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:07,338 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:10,708 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:10,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:10,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 112 [2018-10-27 04:16:10,728 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:10,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 04:16:10,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 04:16:10,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5788, Invalid=6644, Unknown=0, NotChecked=0, Total=12432 [2018-10-27 04:16:10,730 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 57 states. [2018-10-27 04:16:10,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:10,852 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-10-27 04:16:10,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-27 04:16:10,852 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 167 [2018-10-27 04:16:10,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:10,854 INFO L225 Difference]: With dead ends: 177 [2018-10-27 04:16:10,854 INFO L226 Difference]: Without dead ends: 172 [2018-10-27 04:16:10,855 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 279 SyntacticMatches, 1 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=5794, Invalid=6862, Unknown=0, NotChecked=0, Total=12656 [2018-10-27 04:16:10,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-27 04:16:10,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-27 04:16:10,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-27 04:16:10,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-10-27 04:16:10,858 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 167 [2018-10-27 04:16:10,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:10,858 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-10-27 04:16:10,858 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 04:16:10,858 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-10-27 04:16:10,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-27 04:16:10,859 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:10,859 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:10,859 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:10,859 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:10,859 INFO L82 PathProgramCache]: Analyzing trace with hash -522854787, now seen corresponding path program 53 times [2018-10-27 04:16:10,859 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:10,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:10,860 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:16:10,860 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:10,860 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:10,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:12,115 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:12,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:12,115 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:12,116 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:12,116 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:12,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:12,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:12,124 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:16:12,124 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:16:12,247 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-10-27 04:16:12,247 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:16:12,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:12,953 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:12,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:16,407 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:16,427 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:16,427 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 114 [2018-10-27 04:16:16,427 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:16,428 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-27 04:16:16,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-27 04:16:16,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6005, Invalid=6877, Unknown=0, NotChecked=0, Total=12882 [2018-10-27 04:16:16,429 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 58 states. [2018-10-27 04:16:16,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:16,602 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-10-27 04:16:16,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-27 04:16:16,603 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 170 [2018-10-27 04:16:16,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:16,603 INFO L225 Difference]: With dead ends: 180 [2018-10-27 04:16:16,604 INFO L226 Difference]: Without dead ends: 175 [2018-10-27 04:16:16,604 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 284 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=6011, Invalid=7099, Unknown=0, NotChecked=0, Total=13110 [2018-10-27 04:16:16,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-27 04:16:16,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2018-10-27 04:16:16,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-27 04:16:16,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-10-27 04:16:16,608 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 170 [2018-10-27 04:16:16,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:16,609 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-10-27 04:16:16,609 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-27 04:16:16,609 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-10-27 04:16:16,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-27 04:16:16,610 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:16,610 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:16,610 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:16,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:16,610 INFO L82 PathProgramCache]: Analyzing trace with hash 2118682877, now seen corresponding path program 54 times [2018-10-27 04:16:16,611 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:16,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:16,611 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:16:16,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:16,611 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:16,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:17,835 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:17,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:17,836 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:17,836 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:17,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:17,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:17,836 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:17,843 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:16:17,844 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:16:17,932 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:16:17,932 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:16:17,937 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:18,067 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:18,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:21,382 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:21,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:21,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-27 04:16:21,402 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:21,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-27 04:16:21,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-27 04:16:21,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6226, Invalid=7114, Unknown=0, NotChecked=0, Total=13340 [2018-10-27 04:16:21,404 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 59 states. [2018-10-27 04:16:21,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:21,526 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-10-27 04:16:21,526 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-27 04:16:21,526 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 173 [2018-10-27 04:16:21,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:21,528 INFO L225 Difference]: With dead ends: 183 [2018-10-27 04:16:21,528 INFO L226 Difference]: Without dead ends: 178 [2018-10-27 04:16:21,529 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 289 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6232, Invalid=7340, Unknown=0, NotChecked=0, Total=13572 [2018-10-27 04:16:21,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-27 04:16:21,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-10-27 04:16:21,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-27 04:16:21,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2018-10-27 04:16:21,534 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 173 [2018-10-27 04:16:21,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:21,534 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2018-10-27 04:16:21,534 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-27 04:16:21,534 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2018-10-27 04:16:21,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-27 04:16:21,535 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:21,535 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:21,536 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:21,536 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:21,536 INFO L82 PathProgramCache]: Analyzing trace with hash -518533507, now seen corresponding path program 55 times [2018-10-27 04:16:21,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:21,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:21,537 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:16:21,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:21,537 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:21,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:22,889 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:22,889 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:22,890 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:22,890 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:22,890 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:22,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:22,890 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:22,900 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:16:22,900 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:16:22,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:22,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:23,082 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:23,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:26,574 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:26,594 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:26,594 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-10-27 04:16:26,594 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:26,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-27 04:16:26,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-27 04:16:26,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6451, Invalid=7355, Unknown=0, NotChecked=0, Total=13806 [2018-10-27 04:16:26,596 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 60 states. [2018-10-27 04:16:26,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:26,781 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-10-27 04:16:26,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-27 04:16:26,782 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 176 [2018-10-27 04:16:26,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:26,783 INFO L225 Difference]: With dead ends: 186 [2018-10-27 04:16:26,783 INFO L226 Difference]: Without dead ends: 181 [2018-10-27 04:16:26,784 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 294 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=6457, Invalid=7585, Unknown=0, NotChecked=0, Total=14042 [2018-10-27 04:16:26,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-27 04:16:26,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2018-10-27 04:16:26,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-27 04:16:26,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-10-27 04:16:26,787 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 176 [2018-10-27 04:16:26,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:26,788 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-10-27 04:16:26,788 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-27 04:16:26,788 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-10-27 04:16:26,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-27 04:16:26,789 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:26,789 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:26,789 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:26,789 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:26,789 INFO L82 PathProgramCache]: Analyzing trace with hash 2004916477, now seen corresponding path program 56 times [2018-10-27 04:16:26,789 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:26,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:26,790 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:16:26,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:26,790 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:26,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:28,105 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:28,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:28,105 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:28,105 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:28,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:28,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:28,106 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:28,115 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:16:28,115 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:16:28,247 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2018-10-27 04:16:28,248 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:16:28,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:28,420 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:28,420 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:32,042 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:32,062 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:32,062 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 120 [2018-10-27 04:16:32,063 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:32,063 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-27 04:16:32,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-27 04:16:32,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6680, Invalid=7600, Unknown=0, NotChecked=0, Total=14280 [2018-10-27 04:16:32,064 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 61 states. [2018-10-27 04:16:32,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:32,249 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-10-27 04:16:32,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-27 04:16:32,250 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 179 [2018-10-27 04:16:32,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:32,251 INFO L225 Difference]: With dead ends: 189 [2018-10-27 04:16:32,251 INFO L226 Difference]: Without dead ends: 184 [2018-10-27 04:16:32,252 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 299 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 451 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6686, Invalid=7834, Unknown=0, NotChecked=0, Total=14520 [2018-10-27 04:16:32,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-27 04:16:32,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-10-27 04:16:32,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-27 04:16:32,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-10-27 04:16:32,256 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 179 [2018-10-27 04:16:32,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:32,257 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-10-27 04:16:32,257 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-27 04:16:32,257 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-10-27 04:16:32,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-27 04:16:32,258 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:32,258 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:32,258 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:32,258 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:32,259 INFO L82 PathProgramCache]: Analyzing trace with hash -1004159363, now seen corresponding path program 57 times [2018-10-27 04:16:32,259 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:32,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:32,259 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:16:32,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:32,260 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:32,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:33,703 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:33,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:33,703 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:33,703 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:33,703 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:33,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:33,703 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:33,711 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:16:33,712 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:16:33,801 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:16:33,801 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:16:33,805 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:33,894 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:33,895 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:37,708 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:37,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:37,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-27 04:16:37,729 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:37,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-27 04:16:37,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-27 04:16:37,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6913, Invalid=7849, Unknown=0, NotChecked=0, Total=14762 [2018-10-27 04:16:37,730 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 62 states. [2018-10-27 04:16:37,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:37,870 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-10-27 04:16:37,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-27 04:16:37,870 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 182 [2018-10-27 04:16:37,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:37,871 INFO L225 Difference]: With dead ends: 192 [2018-10-27 04:16:37,871 INFO L226 Difference]: Without dead ends: 187 [2018-10-27 04:16:37,872 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 304 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=6919, Invalid=8087, Unknown=0, NotChecked=0, Total=15006 [2018-10-27 04:16:37,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-27 04:16:37,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-27 04:16:37,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-27 04:16:37,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-10-27 04:16:37,876 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 182 [2018-10-27 04:16:37,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:37,876 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-10-27 04:16:37,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-27 04:16:37,876 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-10-27 04:16:37,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-27 04:16:37,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:37,877 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:37,878 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:37,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:37,878 INFO L82 PathProgramCache]: Analyzing trace with hash 174893309, now seen corresponding path program 58 times [2018-10-27 04:16:37,878 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:37,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:37,879 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:16:37,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:37,879 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:37,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:39,424 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:39,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:39,425 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:39,425 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:39,425 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:39,425 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:39,425 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:39,436 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:16:39,436 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:16:39,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:39,532 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:39,621 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:39,622 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:43,437 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:43,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:43,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 124 [2018-10-27 04:16:43,458 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:43,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-27 04:16:43,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-27 04:16:43,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7150, Invalid=8102, Unknown=0, NotChecked=0, Total=15252 [2018-10-27 04:16:43,460 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 63 states. [2018-10-27 04:16:43,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:43,647 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-10-27 04:16:43,647 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-27 04:16:43,647 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 185 [2018-10-27 04:16:43,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:43,648 INFO L225 Difference]: With dead ends: 195 [2018-10-27 04:16:43,648 INFO L226 Difference]: Without dead ends: 190 [2018-10-27 04:16:43,649 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 309 SyntacticMatches, 1 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=7156, Invalid=8344, Unknown=0, NotChecked=0, Total=15500 [2018-10-27 04:16:43,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-10-27 04:16:43,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-10-27 04:16:43,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-27 04:16:43,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2018-10-27 04:16:43,652 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 185 [2018-10-27 04:16:43,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:43,652 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2018-10-27 04:16:43,653 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-27 04:16:43,653 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2018-10-27 04:16:43,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-10-27 04:16:43,653 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:43,653 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:43,654 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:43,654 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:43,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1090498173, now seen corresponding path program 59 times [2018-10-27 04:16:43,654 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:43,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:43,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:16:43,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:43,655 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:43,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:45,257 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:45,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:45,258 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:45,258 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:45,258 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:45,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:45,258 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:45,267 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:16:45,267 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:16:45,406 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2018-10-27 04:16:45,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:16:45,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:45,489 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:45,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:49,364 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:49,384 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:49,385 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 126 [2018-10-27 04:16:49,385 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:49,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-27 04:16:49,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-27 04:16:49,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7391, Invalid=8359, Unknown=0, NotChecked=0, Total=15750 [2018-10-27 04:16:49,387 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 64 states. [2018-10-27 04:16:49,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:49,555 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-10-27 04:16:49,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-27 04:16:49,556 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 188 [2018-10-27 04:16:49,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:49,557 INFO L225 Difference]: With dead ends: 198 [2018-10-27 04:16:49,557 INFO L226 Difference]: Without dead ends: 193 [2018-10-27 04:16:49,558 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 314 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=7397, Invalid=8605, Unknown=0, NotChecked=0, Total=16002 [2018-10-27 04:16:49,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-27 04:16:49,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-27 04:16:49,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-27 04:16:49,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-10-27 04:16:49,561 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 188 [2018-10-27 04:16:49,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:49,561 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-10-27 04:16:49,561 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-27 04:16:49,561 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-10-27 04:16:49,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-27 04:16:49,562 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:49,562 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:49,562 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:49,563 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:49,563 INFO L82 PathProgramCache]: Analyzing trace with hash 537704701, now seen corresponding path program 60 times [2018-10-27 04:16:49,563 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:49,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:49,563 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:16:49,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:49,564 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:49,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:51,021 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:51,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:51,022 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:51,022 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:51,022 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:51,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:51,022 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:51,030 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:16:51,030 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:16:51,123 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:16:51,123 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:16:51,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:51,201 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:51,201 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:16:55,237 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:55,268 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:16:55,268 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-27 04:16:55,268 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:16:55,269 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-27 04:16:55,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-27 04:16:55,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7636, Invalid=8620, Unknown=0, NotChecked=0, Total=16256 [2018-10-27 04:16:55,271 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 65 states. [2018-10-27 04:16:55,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:16:55,990 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-10-27 04:16:55,990 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-27 04:16:55,990 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 191 [2018-10-27 04:16:55,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:16:55,991 INFO L225 Difference]: With dead ends: 201 [2018-10-27 04:16:55,991 INFO L226 Difference]: Without dead ends: 196 [2018-10-27 04:16:55,992 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 319 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=7642, Invalid=8870, Unknown=0, NotChecked=0, Total=16512 [2018-10-27 04:16:55,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-27 04:16:55,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-27 04:16:55,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-27 04:16:55,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-10-27 04:16:55,997 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 191 [2018-10-27 04:16:55,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:16:55,997 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-10-27 04:16:55,997 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-27 04:16:55,997 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-10-27 04:16:55,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-27 04:16:55,998 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:16:55,998 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:16:55,999 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:16:55,999 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:16:55,999 INFO L82 PathProgramCache]: Analyzing trace with hash -828006787, now seen corresponding path program 61 times [2018-10-27 04:16:55,999 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:16:55,999 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:56,000 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:16:56,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:16:56,000 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:16:56,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:57,982 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:57,982 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:57,982 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:16:57,982 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:16:57,983 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:16:57,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:16:57,983 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:16:57,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:16:57,990 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:16:58,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:16:58,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:16:58,164 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:16:58,164 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:17:02,259 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:02,279 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:17:02,279 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 130 [2018-10-27 04:17:02,279 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:17:02,280 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-27 04:17:02,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-27 04:17:02,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7885, Invalid=8885, Unknown=0, NotChecked=0, Total=16770 [2018-10-27 04:17:02,281 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 66 states. [2018-10-27 04:17:02,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:02,478 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-10-27 04:17:02,478 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-27 04:17:02,478 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 194 [2018-10-27 04:17:02,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:02,479 INFO L225 Difference]: With dead ends: 204 [2018-10-27 04:17:02,479 INFO L226 Difference]: Without dead ends: 199 [2018-10-27 04:17:02,480 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 454 GetRequests, 324 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=7891, Invalid=9139, Unknown=0, NotChecked=0, Total=17030 [2018-10-27 04:17:02,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-27 04:17:02,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-27 04:17:02,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-27 04:17:02,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-10-27 04:17:02,484 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 194 [2018-10-27 04:17:02,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:02,484 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-10-27 04:17:02,485 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-27 04:17:02,485 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-10-27 04:17:02,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-27 04:17:02,486 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:02,486 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:02,486 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:02,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:02,486 INFO L82 PathProgramCache]: Analyzing trace with hash -513750787, now seen corresponding path program 62 times [2018-10-27 04:17:02,487 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:02,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:02,487 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:17:02,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:02,487 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:02,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:04,048 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:04,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:04,049 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:17:04,049 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:17:04,049 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:17:04,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:04,049 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:04,058 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:17:04,058 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:17:04,209 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2018-10-27 04:17:04,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:17:04,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:17:04,291 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:04,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:17:08,509 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:08,530 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:17:08,531 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 132 [2018-10-27 04:17:08,531 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:17:08,531 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-27 04:17:08,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-27 04:17:08,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8138, Invalid=9154, Unknown=0, NotChecked=0, Total=17292 [2018-10-27 04:17:08,533 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 67 states. [2018-10-27 04:17:08,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:08,754 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-10-27 04:17:08,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-27 04:17:08,755 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 197 [2018-10-27 04:17:08,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:08,757 INFO L225 Difference]: With dead ends: 207 [2018-10-27 04:17:08,757 INFO L226 Difference]: Without dead ends: 202 [2018-10-27 04:17:08,758 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 329 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2018-10-27 04:17:08,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-27 04:17:08,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-10-27 04:17:08,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-27 04:17:08,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2018-10-27 04:17:08,763 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 197 [2018-10-27 04:17:08,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:08,763 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2018-10-27 04:17:08,763 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-27 04:17:08,763 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2018-10-27 04:17:08,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-27 04:17:08,767 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:08,767 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:08,767 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:08,767 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:08,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1541960067, now seen corresponding path program 63 times [2018-10-27 04:17:08,768 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:08,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:08,768 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:17:08,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:08,769 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:08,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:10,355 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:10,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:10,355 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:17:10,355 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:17:10,355 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:17:10,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:10,355 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:10,365 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:17:10,365 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:17:10,459 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:17:10,459 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:17:10,463 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:17:10,550 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:10,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:17:14,942 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:14,962 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:17:14,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-27 04:17:14,962 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:17:14,963 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-27 04:17:14,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-27 04:17:14,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8395, Invalid=9427, Unknown=0, NotChecked=0, Total=17822 [2018-10-27 04:17:14,964 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 68 states. [2018-10-27 04:17:15,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:15,133 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-10-27 04:17:15,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-27 04:17:15,133 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 200 [2018-10-27 04:17:15,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:15,134 INFO L225 Difference]: With dead ends: 210 [2018-10-27 04:17:15,134 INFO L226 Difference]: Without dead ends: 205 [2018-10-27 04:17:15,135 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=8401, Invalid=9689, Unknown=0, NotChecked=0, Total=18090 [2018-10-27 04:17:15,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-27 04:17:15,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-10-27 04:17:15,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-27 04:17:15,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2018-10-27 04:17:15,138 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 200 [2018-10-27 04:17:15,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:15,138 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2018-10-27 04:17:15,138 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-27 04:17:15,138 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2018-10-27 04:17:15,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-27 04:17:15,139 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:15,139 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:15,140 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:15,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:15,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1217865475, now seen corresponding path program 64 times [2018-10-27 04:17:15,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:15,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:15,141 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:17:15,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:15,141 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:15,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:16,764 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:16,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:16,765 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:17:16,765 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:17:16,765 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:17:16,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:16,765 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:16,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:17:16,775 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:17:16,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:16,876 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:17:16,943 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:16,943 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:17:21,457 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:21,477 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:17:21,478 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 136 [2018-10-27 04:17:21,478 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:17:21,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-27 04:17:21,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-27 04:17:21,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8656, Invalid=9704, Unknown=0, NotChecked=0, Total=18360 [2018-10-27 04:17:21,479 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 69 states. [2018-10-27 04:17:21,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:21,668 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-10-27 04:17:21,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-27 04:17:21,668 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 203 [2018-10-27 04:17:21,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:21,669 INFO L225 Difference]: With dead ends: 213 [2018-10-27 04:17:21,669 INFO L226 Difference]: Without dead ends: 208 [2018-10-27 04:17:21,670 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 339 SyntacticMatches, 1 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=8662, Invalid=9970, Unknown=0, NotChecked=0, Total=18632 [2018-10-27 04:17:21,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-27 04:17:21,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-10-27 04:17:21,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-27 04:17:21,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-10-27 04:17:21,673 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 203 [2018-10-27 04:17:21,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:21,674 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-10-27 04:17:21,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-27 04:17:21,674 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-10-27 04:17:21,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-27 04:17:21,675 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:21,675 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:21,675 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:21,675 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:21,675 INFO L82 PathProgramCache]: Analyzing trace with hash -1202356611, now seen corresponding path program 65 times [2018-10-27 04:17:21,675 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:21,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:21,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:17:21,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:21,676 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:21,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:23,366 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:23,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:23,367 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:17:23,367 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:17:23,367 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:17:23,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:23,367 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:23,377 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:17:23,377 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:17:23,537 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2018-10-27 04:17:23,537 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:17:23,541 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:17:23,624 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:23,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:17:28,243 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:28,264 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:17:28,264 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 138 [2018-10-27 04:17:28,264 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:17:28,264 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-27 04:17:28,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-27 04:17:28,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8921, Invalid=9985, Unknown=0, NotChecked=0, Total=18906 [2018-10-27 04:17:28,266 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 70 states. [2018-10-27 04:17:28,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:28,482 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-10-27 04:17:28,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-27 04:17:28,483 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 206 [2018-10-27 04:17:28,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:28,484 INFO L225 Difference]: With dead ends: 216 [2018-10-27 04:17:28,484 INFO L226 Difference]: Without dead ends: 211 [2018-10-27 04:17:28,485 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 344 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=8927, Invalid=10255, Unknown=0, NotChecked=0, Total=19182 [2018-10-27 04:17:28,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-27 04:17:28,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-10-27 04:17:28,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-27 04:17:28,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 210 transitions. [2018-10-27 04:17:28,489 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 210 transitions. Word has length 206 [2018-10-27 04:17:28,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:28,489 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 210 transitions. [2018-10-27 04:17:28,490 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-27 04:17:28,490 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 210 transitions. [2018-10-27 04:17:28,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-27 04:17:28,491 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:28,491 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:28,491 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:28,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:28,491 INFO L82 PathProgramCache]: Analyzing trace with hash 1260710141, now seen corresponding path program 66 times [2018-10-27 04:17:28,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:28,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:28,492 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:17:28,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:28,492 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:28,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:30,223 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:30,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:30,223 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:17:30,224 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:17:30,224 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:17:30,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:30,224 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:30,231 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:17:30,232 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:17:30,333 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:17:30,333 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:17:30,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:17:30,426 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:30,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:17:35,232 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:35,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:17:35,252 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-27 04:17:35,253 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:17:35,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-27 04:17:35,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-27 04:17:35,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9190, Invalid=10270, Unknown=0, NotChecked=0, Total=19460 [2018-10-27 04:17:35,254 INFO L87 Difference]: Start difference. First operand 210 states and 210 transitions. Second operand 71 states. [2018-10-27 04:17:35,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:35,422 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-10-27 04:17:35,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-27 04:17:35,422 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 209 [2018-10-27 04:17:35,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:35,423 INFO L225 Difference]: With dead ends: 219 [2018-10-27 04:17:35,423 INFO L226 Difference]: Without dead ends: 214 [2018-10-27 04:17:35,424 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 349 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=9196, Invalid=10544, Unknown=0, NotChecked=0, Total=19740 [2018-10-27 04:17:35,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-27 04:17:35,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-27 04:17:35,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-27 04:17:35,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 213 transitions. [2018-10-27 04:17:35,428 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 213 transitions. Word has length 209 [2018-10-27 04:17:35,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:35,428 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 213 transitions. [2018-10-27 04:17:35,428 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-27 04:17:35,428 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 213 transitions. [2018-10-27 04:17:35,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-27 04:17:35,429 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:35,430 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:35,430 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:35,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:35,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1033933187, now seen corresponding path program 67 times [2018-10-27 04:17:35,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:35,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:35,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:17:35,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:35,431 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:35,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:37,278 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:37,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:37,278 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:17:37,278 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:17:37,278 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:17:37,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:37,278 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:37,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:17:37,286 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:17:37,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:37,394 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:17:37,458 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:37,459 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:17:42,474 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:42,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:17:42,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 142 [2018-10-27 04:17:42,494 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:17:42,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-27 04:17:42,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-27 04:17:42,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9463, Invalid=10559, Unknown=0, NotChecked=0, Total=20022 [2018-10-27 04:17:42,496 INFO L87 Difference]: Start difference. First operand 213 states and 213 transitions. Second operand 72 states. [2018-10-27 04:17:42,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:42,730 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2018-10-27 04:17:42,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-27 04:17:42,730 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 212 [2018-10-27 04:17:42,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:42,731 INFO L225 Difference]: With dead ends: 222 [2018-10-27 04:17:42,731 INFO L226 Difference]: Without dead ends: 217 [2018-10-27 04:17:42,732 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 354 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=9469, Invalid=10837, Unknown=0, NotChecked=0, Total=20306 [2018-10-27 04:17:42,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-27 04:17:42,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 216. [2018-10-27 04:17:42,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-10-27 04:17:42,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 216 transitions. [2018-10-27 04:17:42,736 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 216 transitions. Word has length 212 [2018-10-27 04:17:42,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:42,736 INFO L481 AbstractCegarLoop]: Abstraction has 216 states and 216 transitions. [2018-10-27 04:17:42,737 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-27 04:17:42,737 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 216 transitions. [2018-10-27 04:17:42,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-27 04:17:42,738 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:42,738 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:42,738 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:42,738 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:42,739 INFO L82 PathProgramCache]: Analyzing trace with hash -2053834499, now seen corresponding path program 68 times [2018-10-27 04:17:42,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:42,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:42,739 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:17:42,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:42,740 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:42,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:44,644 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:44,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:44,644 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:17:44,644 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:17:44,645 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:17:44,645 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:44,645 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:44,652 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:17:44,652 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:17:44,824 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-10-27 04:17:44,824 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:17:44,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:17:44,916 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:44,916 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:17:50,002 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:50,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:17:50,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 144 [2018-10-27 04:17:50,024 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:17:50,025 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-27 04:17:50,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-27 04:17:50,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9740, Invalid=10852, Unknown=0, NotChecked=0, Total=20592 [2018-10-27 04:17:50,026 INFO L87 Difference]: Start difference. First operand 216 states and 216 transitions. Second operand 73 states. [2018-10-27 04:17:50,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:17:50,238 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2018-10-27 04:17:50,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-27 04:17:50,239 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 215 [2018-10-27 04:17:50,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:17:50,240 INFO L225 Difference]: With dead ends: 225 [2018-10-27 04:17:50,240 INFO L226 Difference]: Without dead ends: 220 [2018-10-27 04:17:50,241 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 359 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=9746, Invalid=11134, Unknown=0, NotChecked=0, Total=20880 [2018-10-27 04:17:50,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-27 04:17:50,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 219. [2018-10-27 04:17:50,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-27 04:17:50,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 219 transitions. [2018-10-27 04:17:50,244 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 219 transitions. Word has length 215 [2018-10-27 04:17:50,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:17:50,244 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 219 transitions. [2018-10-27 04:17:50,244 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-27 04:17:50,244 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 219 transitions. [2018-10-27 04:17:50,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-10-27 04:17:50,245 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:17:50,245 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:17:50,245 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:17:50,246 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:17:50,246 INFO L82 PathProgramCache]: Analyzing trace with hash 959798909, now seen corresponding path program 69 times [2018-10-27 04:17:50,246 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:17:50,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:50,246 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:17:50,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:17:50,246 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:17:50,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:17:52,102 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:52,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:52,102 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:17:52,103 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:17:52,103 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:17:52,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:17:52,103 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:52,111 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:17:52,111 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:17:52,210 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:17:52,210 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:17:52,214 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:17:52,302 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:17:52,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-27 04:17:56,904 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-27 04:17:57,105 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:17:57,105 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 04:17:57,111 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 04:17:57,112 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 04:17:57 BoogieIcfgContainer [2018-10-27 04:17:57,112 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 04:17:57,112 INFO L168 Benchmark]: Toolchain (without parser) took 232532.14 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 710.9 MB). Free memory was 1.4 GB in the beginning and 1.8 GB in the end (delta: -410.7 MB). Peak memory consumption was 300.2 MB. Max. memory is 7.1 GB. [2018-10-27 04:17:57,113 INFO L168 Benchmark]: CDTParser took 0.20 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. [2018-10-27 04:17:57,114 INFO L168 Benchmark]: CACSL2BoogieTranslator took 244.05 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. [2018-10-27 04:17:57,114 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.85 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. [2018-10-27 04:17:57,114 INFO L168 Benchmark]: Boogie Preprocessor took 19.61 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 04:17:57,115 INFO L168 Benchmark]: RCFGBuilder took 332.37 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 731.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -771.5 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-27 04:17:57,115 INFO L168 Benchmark]: TraceAbstraction took 231911.16 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -21.0 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 350.2 MB). Peak memory consumption was 329.2 MB. Max. memory is 7.1 GB. [2018-10-27 04:17:57,118 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 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 244.05 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 20.85 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 19.61 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 332.37 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 731.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -771.5 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 231911.16 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -21.0 MB). Free memory was 2.2 GB in the beginning and 1.8 GB in the end (delta: 350.2 MB). Peak memory consumption was 329.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 219 with TraceHistMax 70,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 140 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 231.8s OverallTime, 71 OverallIterations, 70 TraceHistogramMax, 11.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 780 SDtfs, 2482 SDslu, 19339 SDs, 0 SdLazy, 4603 SolverSat, 108 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18260 GetRequests, 13029 SyntacticMatches, 69 SemanticMatches, 5162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18962 ImplicationChecksByTransitivity, 199.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=219occurred in iteration=70, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 70 MinimizatonAttempts, 68 StatesRemovedByMinimization, 68 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.7s SsaConstructionTime, 5.7s SatisfiabilityAnalysisTime, 203.3s InterpolantComputationTime, 15593 NumberOfCodeBlocks, 15593 NumberOfCodeBlocksAsserted, 965 NumberOfCheckSat, 23173 ConstructedInterpolants, 0 QuantifiedInterpolants, 9789751 SizeOfPredicates, 137 NumberOfNonLiveVariables, 29852 ConjunctsInSsa, 2818 ConjunctsInUnsatCore, 206 InterpolantComputations, 2 PerfectInterpolantSequences, 0/485622 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown