java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:09:54,448 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:09:54,450 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:09:54,462 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:09:54,462 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:09:54,464 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:09:54,465 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:09:54,467 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:09:54,469 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:09:54,470 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:09:54,471 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:09:54,471 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:09:54,472 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:09:54,473 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:09:54,474 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:09:54,475 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:09:54,476 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:09:54,478 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:09:54,480 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:09:54,482 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:09:54,483 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:09:54,484 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:09:54,487 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:09:54,487 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:09:54,487 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:09:54,491 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:09:54,493 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:09:54,493 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:09:54,494 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:09:54,495 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:09:54,496 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:09:54,496 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 12:09:54,497 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 12:09:54,497 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 12:09:54,498 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 12:09:54,499 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 12:09:54,499 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:09:54,514 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:09:54,514 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:09:54,515 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:09:54,515 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:09:54,515 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:09:54,515 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:09:54,516 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:09:54,516 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:09:54,516 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:09:54,516 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:09:54,516 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:09:54,517 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:09:54,517 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:09:54,517 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:09:54,518 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:09:54,518 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:09:54,518 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:09:54,518 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:09:54,518 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:09:54,519 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:09:54,519 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:09:54,519 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:09:54,519 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:09:54,520 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:09:54,520 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:09:54,520 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:09:54,520 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:09:54,520 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:09:54,521 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:09:54,521 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:09:54,521 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:09:54,521 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:09:54,521 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:09:54,522 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:09:54,569 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:09:54,588 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:09:54,592 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:09:54,594 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:09:54,594 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:09:54,595 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-10-24 12:09:54,669 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/dc7685018/831919bb49e84002a505a0f092c771bc/FLAG5bb74052d [2018-10-24 12:09:55,091 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:09:55,092 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-10-24 12:09:55,099 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/dc7685018/831919bb49e84002a505a0f092c771bc/FLAG5bb74052d [2018-10-24 12:09:55,114 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/dc7685018/831919bb49e84002a505a0f092c771bc [2018-10-24 12:09:55,125 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:09:55,127 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:09:55,131 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:09:55,132 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:09:55,138 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:09:55,139 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,142 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a802b20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55, skipping insertion in model container [2018-10-24 12:09:55,143 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,154 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:09:55,174 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:09:55,345 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:09:55,350 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:09:55,366 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:09:55,382 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:09:55,383 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55 WrapperNode [2018-10-24 12:09:55,383 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:09:55,384 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:09:55,384 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:09:55,384 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:09:55,394 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,400 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,407 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:09:55,407 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:09:55,408 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:09:55,408 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:09:55,418 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,419 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,419 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,420 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,425 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,431 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,432 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (1/1) ... [2018-10-24 12:09:55,433 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:09:55,434 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:09:55,434 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:09:55,434 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:09:55,435 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:09:55,508 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:09:55,508 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:09:55,508 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:09:55,509 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:09:55,509 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:09:55,509 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:09:55,509 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:09:55,509 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:09:55,803 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:09:55,804 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:09:55 BoogieIcfgContainer [2018-10-24 12:09:55,805 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:09:55,807 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:09:55,807 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:09:55,810 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:09:55,810 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:09:55" (1/3) ... [2018-10-24 12:09:55,811 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d292e46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:09:55, skipping insertion in model container [2018-10-24 12:09:55,811 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:09:55" (2/3) ... [2018-10-24 12:09:55,812 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d292e46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:09:55, skipping insertion in model container [2018-10-24 12:09:55,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:09:55" (3/3) ... [2018-10-24 12:09:55,814 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call4.i [2018-10-24 12:09:55,826 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:09:55,836 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:09:55,859 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:09:55,890 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:09:55,890 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:09:55,890 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:09:55,890 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:09:55,890 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:09:55,891 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:09:55,891 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:09:55,891 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:09:55,910 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-24 12:09:55,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:09:55,916 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:55,917 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:55,919 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:55,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:55,926 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-10-24 12:09:55,929 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:55,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:55,980 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:55,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:55,981 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:56,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:56,043 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:56,045 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:09:56,046 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:09:56,046 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:09:56,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:09:56,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:09:56,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:09:56,064 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-24 12:09:56,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:56,087 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-24 12:09:56,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:09:56,089 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:09:56,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:56,097 INFO L225 Difference]: With dead ends: 29 [2018-10-24 12:09:56,097 INFO L226 Difference]: Without dead ends: 12 [2018-10-24 12:09:56,101 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:09:56,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-24 12:09:56,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-24 12:09:56,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-24 12:09:56,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-24 12:09:56,142 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-24 12:09:56,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:56,142 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-24 12:09:56,142 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:09:56,143 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-24 12:09:56,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:09:56,143 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:56,144 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:56,144 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:56,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:56,145 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-10-24 12:09:56,145 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:56,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:56,146 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:56,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:56,147 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:56,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:56,294 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:56,295 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:09:56,295 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:09:56,295 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:09:56,297 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:09:56,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:09:56,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:09:56,298 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-10-24 12:09:56,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:56,347 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-24 12:09:56,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:09:56,348 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-24 12:09:56,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:56,349 INFO L225 Difference]: With dead ends: 19 [2018-10-24 12:09:56,350 INFO L226 Difference]: Without dead ends: 14 [2018-10-24 12:09:56,351 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:09:56,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-24 12:09:56,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-24 12:09:56,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-24 12:09:56,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-24 12:09:56,356 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-24 12:09:56,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:56,356 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-24 12:09:56,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:09:56,356 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-24 12:09:56,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:09:56,357 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:56,357 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:56,358 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:56,358 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:56,358 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-10-24 12:09:56,358 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:56,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:56,360 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:56,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:56,360 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:56,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:56,544 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:56,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:56,545 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:56,546 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-24 12:09:56,548 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-10-24 12:09:56,595 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:09:56,595 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:09:56,706 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:09:57,043 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:09:57,044 INFO L272 AbstractInterpreter]: Visited 12 different actions 95 times. Merged at 3 different actions 37 times. Widened at 1 different actions 9 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-24 12:09:57,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:57,091 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:09:57,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:57,091 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:57,104 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:57,104 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:57,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:57,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:57,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:57,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:57,308 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:57,329 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:57,329 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-24 12:09:57,329 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:57,330 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-24 12:09:57,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-24 12:09:57,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:09:57,331 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-10-24 12:09:57,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:57,401 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-24 12:09:57,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:09:57,402 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-24 12:09:57,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:57,403 INFO L225 Difference]: With dead ends: 21 [2018-10-24 12:09:57,403 INFO L226 Difference]: Without dead ends: 16 [2018-10-24 12:09:57,404 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:09:57,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-24 12:09:57,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-24 12:09:57,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-24 12:09:57,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-24 12:09:57,409 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-24 12:09:57,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:57,409 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-24 12:09:57,409 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-24 12:09:57,409 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-24 12:09:57,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:09:57,410 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:57,410 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:57,411 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:57,411 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:57,411 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-10-24 12:09:57,411 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:57,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:57,413 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:57,413 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:57,413 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:57,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:57,591 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:57,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:57,592 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:57,592 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:57,592 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:57,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:57,593 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:57,613 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:57,613 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:57,660 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:09:57,660 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:57,662 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:57,684 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:57,684 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:57,968 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:57,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:57,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-24 12:09:57,989 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:57,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:09:57,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:09:57,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:09:57,991 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-10-24 12:09:58,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:58,034 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-24 12:09:58,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:09:58,035 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-24 12:09:58,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:58,036 INFO L225 Difference]: With dead ends: 23 [2018-10-24 12:09:58,036 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:09:58,037 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-24 12:09:58,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:09:58,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 12:09:58,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:09:58,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-24 12:09:58,042 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-24 12:09:58,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:58,042 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-24 12:09:58,042 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:09:58,042 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-24 12:09:58,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-24 12:09:58,043 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:58,043 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:58,044 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:58,044 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:58,044 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-10-24 12:09:58,044 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:58,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:58,045 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:58,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:58,046 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:58,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:58,176 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:58,176 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:58,177 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:58,177 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:58,177 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:58,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:58,177 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:58,186 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:09:58,186 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:09:58,220 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:09:58,221 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:58,223 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:58,253 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:58,253 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:58,505 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:58,526 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:58,527 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-24 12:09:58,527 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:58,527 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:09:58,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:09:58,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:09:58,529 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-10-24 12:09:58,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:58,570 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-24 12:09:58,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:09:58,571 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-10-24 12:09:58,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:58,573 INFO L225 Difference]: With dead ends: 25 [2018-10-24 12:09:58,573 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 12:09:58,574 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:09:58,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 12:09:58,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 12:09:58,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:09:58,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-24 12:09:58,579 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-24 12:09:58,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:58,579 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-24 12:09:58,579 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:09:58,580 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-24 12:09:58,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-24 12:09:58,580 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:58,580 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:58,581 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:58,581 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:58,581 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-10-24 12:09:58,581 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:58,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:58,582 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:09:58,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:58,583 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:58,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:58,742 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:58,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:58,743 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:58,743 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:58,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:58,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:58,743 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:58,758 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:58,758 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:09:58,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:58,770 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:58,785 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:58,786 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:59,237 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:59,260 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:59,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-24 12:09:59,260 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:59,261 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:09:59,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:09:59,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:09:59,262 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-10-24 12:09:59,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:09:59,308 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-24 12:09:59,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:09:59,309 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-24 12:09:59,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:09:59,310 INFO L225 Difference]: With dead ends: 27 [2018-10-24 12:09:59,310 INFO L226 Difference]: Without dead ends: 22 [2018-10-24 12:09:59,311 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:09:59,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-24 12:09:59,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-24 12:09:59,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-24 12:09:59,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-24 12:09:59,316 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-24 12:09:59,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:09:59,316 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-24 12:09:59,316 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:09:59,316 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-24 12:09:59,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 12:09:59,317 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:09:59,317 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:09:59,317 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:09:59,318 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:09:59,318 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-10-24 12:09:59,318 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:09:59,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:59,319 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:09:59,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:09:59,319 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:09:59,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:09:59,567 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:59,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:59,568 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:09:59,568 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:09:59,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:09:59,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:09:59,569 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:09:59,577 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:09:59,578 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:09:59,609 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:09:59,609 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:09:59,612 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:09:59,632 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:59,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:09:59,894 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:09:59,915 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:09:59,915 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-24 12:09:59,915 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:09:59,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:09:59,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:09:59,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:09:59,917 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-10-24 12:09:59,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:00,000 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-24 12:10:00,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:10:00,000 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-24 12:10:00,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:00,001 INFO L225 Difference]: With dead ends: 29 [2018-10-24 12:10:00,001 INFO L226 Difference]: Without dead ends: 24 [2018-10-24 12:10:00,002 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:10:00,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-24 12:10:00,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-24 12:10:00,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-24 12:10:00,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-24 12:10:00,006 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-24 12:10:00,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:00,007 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-24 12:10:00,007 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:10:00,007 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-24 12:10:00,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-24 12:10:00,008 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:00,008 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:00,008 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:00,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:00,009 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-10-24 12:10:00,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:00,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:00,010 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:00,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:00,010 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:00,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:00,309 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:00,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:00,309 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:00,310 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:00,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:00,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:00,310 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:00,319 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:00,319 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:00,330 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:00,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:00,334 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:00,345 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:00,345 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:00,605 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:00,636 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:00,636 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-24 12:10:00,636 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:00,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:10:00,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:10:00,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:10:00,638 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-24 12:10:00,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:00,699 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-24 12:10:00,700 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:10:00,700 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-24 12:10:00,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:00,701 INFO L225 Difference]: With dead ends: 31 [2018-10-24 12:10:00,701 INFO L226 Difference]: Without dead ends: 26 [2018-10-24 12:10:00,702 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:10:00,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-24 12:10:00,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-24 12:10:00,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-24 12:10:00,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-24 12:10:00,707 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-24 12:10:00,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:00,707 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-24 12:10:00,707 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:10:00,708 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-24 12:10:00,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:10:00,708 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:00,709 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:00,709 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:00,709 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:00,709 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-10-24 12:10:00,709 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:00,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:00,710 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:00,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:00,711 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:00,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:00,975 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:00,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:00,976 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:00,976 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:00,976 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:00,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:00,976 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:00,985 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:00,985 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:00,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:00,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:01,014 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:01,014 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:01,282 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:01,304 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:01,304 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-24 12:10:01,304 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:01,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:10:01,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:10:01,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:10:01,305 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-10-24 12:10:01,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:01,425 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-24 12:10:01,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:10:01,426 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-10-24 12:10:01,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:01,427 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:10:01,427 INFO L226 Difference]: Without dead ends: 28 [2018-10-24 12:10:01,428 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:10:01,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-24 12:10:01,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-24 12:10:01,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 12:10:01,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-24 12:10:01,433 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-24 12:10:01,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:01,434 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-24 12:10:01,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:10:01,434 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-24 12:10:01,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-24 12:10:01,435 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:01,435 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:01,435 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:01,435 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:01,435 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-10-24 12:10:01,436 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:01,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:01,436 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:01,437 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:01,437 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:01,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:01,609 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:01,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:01,609 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:01,610 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:01,610 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:01,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:01,610 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:01,619 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:01,620 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:01,706 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:10:01,706 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:01,708 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:01,734 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:01,735 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:02,010 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:02,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:02,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:10:02,032 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:02,032 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:10:02,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:10:02,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:10:02,033 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-10-24 12:10:02,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:02,135 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-24 12:10:02,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:10:02,135 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-10-24 12:10:02,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:02,137 INFO L225 Difference]: With dead ends: 35 [2018-10-24 12:10:02,137 INFO L226 Difference]: Without dead ends: 30 [2018-10-24 12:10:02,138 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:10:02,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-24 12:10:02,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-24 12:10:02,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-24 12:10:02,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-24 12:10:02,144 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-24 12:10:02,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:02,144 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-24 12:10:02,144 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:10:02,144 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-24 12:10:02,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-24 12:10:02,145 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:02,145 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:02,146 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:02,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:02,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-10-24 12:10:02,146 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:02,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:02,147 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:02,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:02,148 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:02,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:02,345 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:02,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:02,346 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:02,346 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:02,346 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:02,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:02,346 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:02,355 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:02,355 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:02,365 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:02,365 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:02,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:02,397 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:02,397 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:02,675 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:02,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:02,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-24 12:10:02,696 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:02,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:10:02,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:10:02,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:10:02,697 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-10-24 12:10:02,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:02,866 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-24 12:10:02,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:10:02,867 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-10-24 12:10:02,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:02,869 INFO L225 Difference]: With dead ends: 37 [2018-10-24 12:10:02,869 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 12:10:02,870 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:10:02,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 12:10:02,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-24 12:10:02,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 12:10:02,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-24 12:10:02,875 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-24 12:10:02,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:02,876 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-24 12:10:02,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:10:02,876 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-24 12:10:02,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:10:02,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:02,877 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:02,877 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:02,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:02,877 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-10-24 12:10:02,878 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:02,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:02,879 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:02,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:02,879 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:02,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:03,124 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:03,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:03,125 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:03,125 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:03,125 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:03,125 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:03,125 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:03,134 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:03,135 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:03,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:03,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:03,182 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:03,182 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:03,579 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:03,600 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:03,600 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-24 12:10:03,600 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:03,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:10:03,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:10:03,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:10:03,602 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-10-24 12:10:03,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:03,722 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-24 12:10:03,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:10:03,723 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-10-24 12:10:03,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:03,724 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:10:03,724 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:10:03,726 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:10:03,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:10:03,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-24 12:10:03,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-24 12:10:03,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-24 12:10:03,731 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-24 12:10:03,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:03,731 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-24 12:10:03,731 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:10:03,731 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-24 12:10:03,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-24 12:10:03,732 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:03,732 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:03,733 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:03,733 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:03,733 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-10-24 12:10:03,733 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:03,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:03,734 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:03,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:03,734 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:03,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:04,178 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:04,179 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:04,179 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:04,179 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:04,179 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:04,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:04,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:04,193 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:04,193 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:22,519 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:10:22,519 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:22,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:22,598 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:22,598 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:22,985 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:23,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:23,007 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-24 12:10:23,007 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:23,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:10:23,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:10:23,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:10:23,008 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-10-24 12:10:23,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:23,323 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-24 12:10:23,324 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:10:23,324 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-10-24 12:10:23,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:23,325 INFO L225 Difference]: With dead ends: 41 [2018-10-24 12:10:23,325 INFO L226 Difference]: Without dead ends: 36 [2018-10-24 12:10:23,326 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:10:23,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-24 12:10:23,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-24 12:10:23,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-24 12:10:23,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-24 12:10:23,330 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-24 12:10:23,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:23,331 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-24 12:10:23,331 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:10:23,331 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-24 12:10:23,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:10:23,331 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:23,332 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:23,332 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:23,332 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:23,332 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-10-24 12:10:23,332 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:23,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:23,333 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:23,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:23,333 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:23,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:23,599 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:23,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:23,600 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:23,600 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:23,600 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:23,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:23,600 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:23,608 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:23,608 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:23,619 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:23,619 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:23,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:23,640 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:23,640 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:24,245 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:24,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:24,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-24 12:10:24,267 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:24,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:10:24,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:10:24,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:10:24,268 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-10-24 12:10:24,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:24,416 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-24 12:10:24,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:10:24,416 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-10-24 12:10:24,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:24,417 INFO L225 Difference]: With dead ends: 43 [2018-10-24 12:10:24,417 INFO L226 Difference]: Without dead ends: 38 [2018-10-24 12:10:24,418 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:10:24,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-24 12:10:24,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-24 12:10:24,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 12:10:24,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-24 12:10:24,423 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-24 12:10:24,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:24,423 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-24 12:10:24,423 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:10:24,423 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-24 12:10:24,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-24 12:10:24,424 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:24,424 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:24,424 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:24,425 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:24,425 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-10-24 12:10:24,425 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:24,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:24,426 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:24,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:24,426 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:24,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:24,685 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:24,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:24,685 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:24,685 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:24,686 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:24,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:24,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:24,693 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:24,694 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:24,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:24,706 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:24,745 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:24,746 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:25,349 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:25,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:25,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-24 12:10:25,372 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:25,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:10:25,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:10:25,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:10:25,373 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-10-24 12:10:25,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:25,679 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-24 12:10:25,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:10:25,680 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-10-24 12:10:25,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:25,681 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:10:25,681 INFO L226 Difference]: Without dead ends: 40 [2018-10-24 12:10:25,682 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:10:25,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-24 12:10:25,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-24 12:10:25,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-24 12:10:25,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-24 12:10:25,686 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-24 12:10:25,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:25,687 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-24 12:10:25,687 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:10:25,687 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-24 12:10:25,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-24 12:10:25,688 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:25,688 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:25,688 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:25,688 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:25,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-10-24 12:10:25,688 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:25,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:25,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:25,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:25,690 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:25,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:26,256 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:26,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:26,257 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:26,257 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:26,257 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:26,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:26,257 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:26,270 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:26,271 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:33,128 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:10:33,128 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:33,135 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:33,164 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:33,164 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:33,842 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:33,863 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:33,863 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-24 12:10:33,863 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:33,863 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:10:33,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:10:33,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:10:33,864 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-10-24 12:10:34,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:34,035 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-10-24 12:10:34,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:10:34,043 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-10-24 12:10:34,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:34,044 INFO L225 Difference]: With dead ends: 47 [2018-10-24 12:10:34,044 INFO L226 Difference]: Without dead ends: 42 [2018-10-24 12:10:34,045 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:10:34,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-24 12:10:34,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-24 12:10:34,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-24 12:10:34,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-24 12:10:34,049 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-24 12:10:34,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:34,050 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-24 12:10:34,050 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:10:34,050 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-24 12:10:34,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:10:34,050 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:34,051 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:34,051 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:34,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:34,051 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-10-24 12:10:34,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:34,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:34,052 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:34,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:34,052 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:34,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:34,419 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:34,419 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:34,419 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:34,420 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:34,420 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:34,420 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:34,420 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:34,428 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:34,428 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:34,440 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:34,440 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:34,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:34,501 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:34,501 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:35,098 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:35,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:35,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-24 12:10:35,118 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:35,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:10:35,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:10:35,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:10:35,119 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-10-24 12:10:35,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:35,317 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-24 12:10:35,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:10:35,317 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-10-24 12:10:35,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:35,318 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:10:35,318 INFO L226 Difference]: Without dead ends: 44 [2018-10-24 12:10:35,320 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:10:35,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-24 12:10:35,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-24 12:10:35,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-24 12:10:35,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-24 12:10:35,325 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-24 12:10:35,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:35,326 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-24 12:10:35,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:10:35,326 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-24 12:10:35,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-24 12:10:35,326 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:35,327 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:35,327 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:35,327 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:35,327 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-10-24 12:10:35,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:35,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:35,328 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:35,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:35,328 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:35,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:35,600 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:35,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:35,600 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:35,600 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:35,600 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:35,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:35,600 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:35,608 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:35,608 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:35,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:35,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:35,650 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:35,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:36,642 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:36,662 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:36,662 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-24 12:10:36,662 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:36,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:10:36,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:10:36,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:10:36,664 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-10-24 12:10:37,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:37,056 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-24 12:10:37,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:10:37,056 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-10-24 12:10:37,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:37,057 INFO L225 Difference]: With dead ends: 51 [2018-10-24 12:10:37,058 INFO L226 Difference]: Without dead ends: 46 [2018-10-24 12:10:37,059 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:10:37,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-24 12:10:37,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-24 12:10:37,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-24 12:10:37,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-24 12:10:37,072 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-24 12:10:37,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:37,072 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-24 12:10:37,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:10:37,072 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-24 12:10:37,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 12:10:37,073 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:37,073 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:37,073 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:37,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:37,074 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-10-24 12:10:37,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:37,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:37,078 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:37,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:37,078 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:37,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:37,414 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:37,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:37,414 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:37,414 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:37,414 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:37,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:37,415 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:37,422 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:37,422 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:45,495 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:10:45,495 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:45,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:45,556 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:45,556 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:46,400 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:46,420 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:46,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-24 12:10:46,421 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:46,421 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:10:46,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:10:46,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:10:46,422 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 20 states. [2018-10-24 12:10:46,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:46,975 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-10-24 12:10:46,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:10:46,976 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-10-24 12:10:46,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:46,977 INFO L225 Difference]: With dead ends: 53 [2018-10-24 12:10:46,977 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:10:46,978 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:10:46,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:10:46,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-24 12:10:46,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:10:46,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-24 12:10:46,983 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-24 12:10:46,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:46,983 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-24 12:10:46,983 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:10:46,983 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-24 12:10:46,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-24 12:10:46,984 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:46,984 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:46,984 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:46,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:46,984 INFO L82 PathProgramCache]: Analyzing trace with hash 723901956, now seen corresponding path program 18 times [2018-10-24 12:10:46,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:46,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:46,985 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:46,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:46,985 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:46,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:47,353 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:47,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:47,353 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:47,353 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:47,353 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:47,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:47,353 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:47,362 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:47,362 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:47,376 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:47,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:47,378 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:47,392 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:47,392 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:48,412 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:48,434 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:48,434 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-24 12:10:48,434 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:48,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:10:48,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:10:48,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:10:48,435 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 21 states. [2018-10-24 12:10:48,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:48,745 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-24 12:10:48,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:10:48,746 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2018-10-24 12:10:48,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:48,747 INFO L225 Difference]: With dead ends: 55 [2018-10-24 12:10:48,747 INFO L226 Difference]: Without dead ends: 50 [2018-10-24 12:10:48,748 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:10:48,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-24 12:10:48,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-24 12:10:48,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-24 12:10:48,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-24 12:10:48,753 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-10-24 12:10:48,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:48,753 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-24 12:10:48,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:10:48,753 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-24 12:10:48,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-24 12:10:48,754 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:48,754 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:48,754 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:48,754 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:48,754 INFO L82 PathProgramCache]: Analyzing trace with hash 880063306, now seen corresponding path program 19 times [2018-10-24 12:10:48,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:48,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:48,755 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:48,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:48,756 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:48,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:49,141 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:49,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:49,141 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:49,141 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:49,141 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:49,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:49,142 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:49,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:49,149 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:49,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:49,168 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:49,204 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:49,204 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:50,425 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:50,445 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:50,446 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-24 12:10:50,446 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:50,446 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:10:50,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:10:50,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:10:50,447 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 22 states. [2018-10-24 12:10:50,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:50,757 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-24 12:10:50,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:10:50,764 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-10-24 12:10:50,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:50,765 INFO L225 Difference]: With dead ends: 57 [2018-10-24 12:10:50,765 INFO L226 Difference]: Without dead ends: 52 [2018-10-24 12:10:50,766 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:10:50,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-24 12:10:50,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-24 12:10:50,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-24 12:10:50,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-24 12:10:50,770 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-10-24 12:10:50,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:50,771 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-24 12:10:50,771 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:10:50,771 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-24 12:10:50,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-24 12:10:50,772 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:50,772 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:50,772 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:50,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:50,773 INFO L82 PathProgramCache]: Analyzing trace with hash 627265296, now seen corresponding path program 20 times [2018-10-24 12:10:50,773 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:50,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:50,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:50,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:50,774 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:50,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:51,927 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:51,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:51,928 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:51,928 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:51,928 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:51,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:51,928 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:51,936 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:10:51,936 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:10:54,063 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:10:54,063 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:54,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:54,078 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:54,078 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:55,510 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:55,531 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:55,531 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-24 12:10:55,531 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:55,532 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:10:55,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:10:55,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:10:55,533 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 23 states. [2018-10-24 12:10:55,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:55,901 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-10-24 12:10:55,905 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:10:55,905 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2018-10-24 12:10:55,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:55,906 INFO L225 Difference]: With dead ends: 59 [2018-10-24 12:10:55,906 INFO L226 Difference]: Without dead ends: 54 [2018-10-24 12:10:55,907 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:10:55,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-24 12:10:55,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-24 12:10:55,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-24 12:10:55,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-24 12:10:55,911 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-10-24 12:10:55,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:55,912 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-24 12:10:55,912 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:10:55,912 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-24 12:10:55,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-24 12:10:55,913 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:55,913 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:55,913 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:55,913 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:55,913 INFO L82 PathProgramCache]: Analyzing trace with hash -1793453738, now seen corresponding path program 21 times [2018-10-24 12:10:55,913 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:55,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:55,914 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:55,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:55,914 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:55,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:56,476 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:56,476 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:56,476 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:56,476 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:56,476 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:56,476 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:56,476 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:56,483 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:10:56,484 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:10:56,500 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:10:56,500 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:10:56,502 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:56,523 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:56,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:57,760 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:57,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:57,781 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-24 12:10:57,782 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:57,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:10:57,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:10:57,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:10:57,784 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 24 states. [2018-10-24 12:10:58,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:10:58,134 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-24 12:10:58,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:10:58,134 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2018-10-24 12:10:58,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:10:58,135 INFO L225 Difference]: With dead ends: 61 [2018-10-24 12:10:58,135 INFO L226 Difference]: Without dead ends: 56 [2018-10-24 12:10:58,137 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:10:58,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-24 12:10:58,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-10-24 12:10:58,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-24 12:10:58,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-24 12:10:58,142 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-10-24 12:10:58,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:10:58,142 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-24 12:10:58,142 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:10:58,143 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-24 12:10:58,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 12:10:58,143 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:10:58,143 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:10:58,143 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:10:58,144 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:10:58,144 INFO L82 PathProgramCache]: Analyzing trace with hash -232170980, now seen corresponding path program 22 times [2018-10-24 12:10:58,144 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:10:58,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:58,145 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:10:58,145 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:10:58,145 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:10:58,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:58,626 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:58,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:58,626 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:10:58,626 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:10:58,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:10:58,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:10:58,626 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:10:58,636 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:10:58,636 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:10:58,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:10:58,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:10:58,680 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:58,680 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:10:59,860 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:10:59,881 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:10:59,881 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-24 12:10:59,881 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:10:59,882 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:10:59,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:10:59,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:10:59,883 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 25 states. [2018-10-24 12:11:00,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:00,264 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-24 12:11:00,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:11:00,265 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2018-10-24 12:11:00,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:00,266 INFO L225 Difference]: With dead ends: 63 [2018-10-24 12:11:00,266 INFO L226 Difference]: Without dead ends: 58 [2018-10-24 12:11:00,267 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 87 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:11:00,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-24 12:11:00,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-10-24 12:11:00,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-24 12:11:00,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-10-24 12:11:00,271 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 55 [2018-10-24 12:11:00,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:00,272 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-10-24 12:11:00,272 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:11:00,272 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-10-24 12:11:00,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-24 12:11:00,272 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:00,272 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:00,273 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:00,273 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:00,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1216973154, now seen corresponding path program 23 times [2018-10-24 12:11:00,273 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:00,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:00,274 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:00,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:00,274 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:00,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:01,489 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:01,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:01,489 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:01,489 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:01,489 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:01,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:01,489 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:01,497 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:01,498 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:02,009 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:11:02,009 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:02,018 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:02,042 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:02,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:03,300 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:03,321 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:03,321 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-24 12:11:03,321 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:03,321 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:11:03,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:11:03,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:11:03,322 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 26 states. [2018-10-24 12:11:03,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:03,743 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-10-24 12:11:03,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:11:03,743 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 57 [2018-10-24 12:11:03,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:03,744 INFO L225 Difference]: With dead ends: 65 [2018-10-24 12:11:03,745 INFO L226 Difference]: Without dead ends: 60 [2018-10-24 12:11:03,745 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:11:03,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-24 12:11:03,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-24 12:11:03,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-24 12:11:03,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-24 12:11:03,749 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 57 [2018-10-24 12:11:03,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:03,749 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-24 12:11:03,749 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:11:03,749 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-24 12:11:03,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-24 12:11:03,751 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:03,751 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:03,751 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:03,751 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:03,752 INFO L82 PathProgramCache]: Analyzing trace with hash -2019885272, now seen corresponding path program 24 times [2018-10-24 12:11:03,752 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:03,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:03,752 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:03,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:03,753 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:03,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:05,198 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:05,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:05,199 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:05,199 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:05,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:05,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:05,199 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:05,209 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:05,209 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:05,226 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:05,227 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:05,228 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:05,297 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:05,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:06,710 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:06,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:06,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-24 12:11:06,731 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:06,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:11:06,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:11:06,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=726, Invalid=1926, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:11:06,733 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 27 states. [2018-10-24 12:11:07,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:07,304 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2018-10-24 12:11:07,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:11:07,305 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 59 [2018-10-24 12:11:07,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:07,306 INFO L225 Difference]: With dead ends: 67 [2018-10-24 12:11:07,306 INFO L226 Difference]: Without dead ends: 62 [2018-10-24 12:11:07,308 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=726, Invalid=1926, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:11:07,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-24 12:11:07,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-10-24 12:11:07,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-24 12:11:07,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-24 12:11:07,312 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 59 [2018-10-24 12:11:07,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:07,313 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-24 12:11:07,313 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:11:07,313 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-24 12:11:07,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-24 12:11:07,313 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:07,314 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:07,314 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:07,314 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:07,314 INFO L82 PathProgramCache]: Analyzing trace with hash 1210456942, now seen corresponding path program 25 times [2018-10-24 12:11:07,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:07,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:07,315 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:07,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:07,315 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:07,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:08,814 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:08,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:08,814 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:08,815 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:08,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:08,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:08,815 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:08,824 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:08,824 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:08,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:08,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:08,863 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:08,863 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:10,371 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:10,391 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:10,392 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2018-10-24 12:11:10,392 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:10,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:11:10,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:11:10,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:11:10,394 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 28 states. [2018-10-24 12:11:10,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:10,877 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-24 12:11:10,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:11:10,882 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 61 [2018-10-24 12:11:10,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:10,883 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:11:10,883 INFO L226 Difference]: Without dead ends: 64 [2018-10-24 12:11:10,884 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2018-10-24 12:11:10,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-24 12:11:10,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-10-24 12:11:10,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-24 12:11:10,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2018-10-24 12:11:10,888 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 61 [2018-10-24 12:11:10,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:10,888 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2018-10-24 12:11:10,888 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:11:10,888 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2018-10-24 12:11:10,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-24 12:11:10,889 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:10,889 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:10,889 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:10,889 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:10,889 INFO L82 PathProgramCache]: Analyzing trace with hash 307969588, now seen corresponding path program 26 times [2018-10-24 12:11:10,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:10,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:10,890 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:10,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:10,891 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:10,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:11,575 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:11,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:11,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:11,576 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:11,576 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:11,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:11,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:11,584 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:11,584 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:11:11,694 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-24 12:11:11,694 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:11,696 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:11,716 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:11,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:13,558 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:13,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:13,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-24 12:11:13,580 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:13,580 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:11:13,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:11:13,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=838, Invalid=2242, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:11:13,582 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 29 states. [2018-10-24 12:11:14,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:14,103 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2018-10-24 12:11:14,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:11:14,103 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 63 [2018-10-24 12:11:14,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:14,104 INFO L225 Difference]: With dead ends: 71 [2018-10-24 12:11:14,104 INFO L226 Difference]: Without dead ends: 66 [2018-10-24 12:11:14,106 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=838, Invalid=2242, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:11:14,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-24 12:11:14,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-10-24 12:11:14,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-24 12:11:14,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-24 12:11:14,110 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 63 [2018-10-24 12:11:14,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:14,110 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-24 12:11:14,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:11:14,111 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-24 12:11:14,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-24 12:11:14,111 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:14,111 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:14,111 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:14,111 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:14,112 INFO L82 PathProgramCache]: Analyzing trace with hash 601016186, now seen corresponding path program 27 times [2018-10-24 12:11:14,112 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:14,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:14,112 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:14,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:14,112 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:14,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:14,697 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:14,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:14,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:14,697 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:14,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:14,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:14,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:14,707 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:11:14,707 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:11:14,725 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:11:14,725 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:11:14,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:14,742 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:14,743 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:16,461 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:16,483 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:16,483 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-24 12:11:16,483 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:16,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:11:16,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:11:16,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:11:16,485 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 30 states. [2018-10-24 12:11:17,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:17,101 INFO L93 Difference]: Finished difference Result 73 states and 73 transitions. [2018-10-24 12:11:17,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:11:17,102 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 65 [2018-10-24 12:11:17,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:17,103 INFO L225 Difference]: With dead ends: 73 [2018-10-24 12:11:17,103 INFO L226 Difference]: Without dead ends: 68 [2018-10-24 12:11:17,104 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:11:17,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-10-24 12:11:17,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-10-24 12:11:17,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-24 12:11:17,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-10-24 12:11:17,109 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 65 [2018-10-24 12:11:17,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:17,109 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-10-24 12:11:17,110 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:11:17,110 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-10-24 12:11:17,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-24 12:11:17,110 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:17,110 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:17,111 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:17,111 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:17,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1249044672, now seen corresponding path program 28 times [2018-10-24 12:11:17,111 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:17,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:17,112 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:11:17,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:17,112 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:17,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:18,256 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:18,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:18,257 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:18,257 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:18,257 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:18,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:18,258 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:18,266 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:18,266 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:11:18,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:18,290 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:11:18,323 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:18,323 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:11:20,332 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:20,353 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:11:20,353 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2018-10-24 12:11:20,353 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:11:20,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:11:20,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:11:20,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=958, Invalid=2582, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:11:20,355 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 31 states. [2018-10-24 12:11:20,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:11:20,945 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-24 12:11:20,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:11:20,946 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 67 [2018-10-24 12:11:20,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:11:20,947 INFO L225 Difference]: With dead ends: 75 [2018-10-24 12:11:20,947 INFO L226 Difference]: Without dead ends: 70 [2018-10-24 12:11:20,948 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=958, Invalid=2582, Unknown=0, NotChecked=0, Total=3540 [2018-10-24 12:11:20,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-24 12:11:20,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-10-24 12:11:20,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-24 12:11:20,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-10-24 12:11:20,953 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 67 [2018-10-24 12:11:20,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:11:20,953 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-10-24 12:11:20,953 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:11:20,953 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-10-24 12:11:20,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-24 12:11:20,954 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:11:20,954 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:11:20,954 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:11:20,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:11:20,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1041068666, now seen corresponding path program 29 times [2018-10-24 12:11:20,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:11:20,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:20,955 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:11:20,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:11:20,955 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:11:20,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:11:21,701 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:11:21,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:21,701 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:11:21,702 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:11:21,702 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:11:21,702 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:11:21,702 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:11:21,710 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:11:21,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:12:14,705 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:12:14,705 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:14,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:14,774 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:14,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:16,747 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:16,769 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:16,769 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-24 12:12:16,769 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:16,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:12:16,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:12:16,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:12:16,770 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 32 states. [2018-10-24 12:12:17,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:17,402 INFO L93 Difference]: Finished difference Result 77 states and 77 transitions. [2018-10-24 12:12:17,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:12:17,402 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 69 [2018-10-24 12:12:17,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:17,404 INFO L225 Difference]: With dead ends: 77 [2018-10-24 12:12:17,404 INFO L226 Difference]: Without dead ends: 72 [2018-10-24 12:12:17,405 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2018-10-24 12:12:17,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-24 12:12:17,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-10-24 12:12:17,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-24 12:12:17,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-24 12:12:17,409 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 69 [2018-10-24 12:12:17,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:17,410 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-24 12:12:17,410 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:12:17,410 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-24 12:12:17,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-24 12:12:17,410 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:17,411 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:17,411 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:17,411 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:17,411 INFO L82 PathProgramCache]: Analyzing trace with hash 1255377484, now seen corresponding path program 30 times [2018-10-24 12:12:17,411 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:17,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:17,412 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:17,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:17,412 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:17,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:18,471 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:18,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:18,471 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:18,471 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:18,471 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:18,471 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:18,471 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:12:18,479 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:12:18,479 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:12:18,501 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:12:18,501 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:12:18,503 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:18,528 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:18,528 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:20,662 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:20,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:20,683 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2018-10-24 12:12:20,683 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:20,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:12:20,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:12:20,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1086, Invalid=2946, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:12:20,688 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 33 states. [2018-10-24 12:12:21,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:21,366 INFO L93 Difference]: Finished difference Result 79 states and 79 transitions. [2018-10-24 12:12:21,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:12:21,367 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 71 [2018-10-24 12:12:21,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:21,368 INFO L225 Difference]: With dead ends: 79 [2018-10-24 12:12:21,368 INFO L226 Difference]: Without dead ends: 74 [2018-10-24 12:12:21,369 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1086, Invalid=2946, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:12:21,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-24 12:12:21,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2018-10-24 12:12:21,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-24 12:12:21,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-10-24 12:12:21,373 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 71 [2018-10-24 12:12:21,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:21,374 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-10-24 12:12:21,374 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:12:21,374 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-10-24 12:12:21,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-24 12:12:21,375 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:21,375 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:21,375 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:21,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:21,375 INFO L82 PathProgramCache]: Analyzing trace with hash 526937490, now seen corresponding path program 31 times [2018-10-24 12:12:21,375 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:21,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:21,376 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:12:21,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:21,377 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:21,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:22,090 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:22,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:22,091 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:22,091 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:22,091 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:22,091 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:22,091 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:12:22,100 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:22,100 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:12:22,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:22,123 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:12:22,148 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:22,148 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:12:24,485 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:24,506 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:12:24,506 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2018-10-24 12:12:24,506 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:12:24,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:12:24,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:12:24,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:12:24,508 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 34 states. [2018-10-24 12:12:25,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:12:25,221 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-24 12:12:25,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:12:25,222 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 73 [2018-10-24 12:12:25,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:12:25,223 INFO L225 Difference]: With dead ends: 81 [2018-10-24 12:12:25,223 INFO L226 Difference]: Without dead ends: 76 [2018-10-24 12:12:25,224 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 114 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2018-10-24 12:12:25,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-24 12:12:25,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-10-24 12:12:25,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-24 12:12:25,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2018-10-24 12:12:25,228 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 73 [2018-10-24 12:12:25,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:12:25,228 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2018-10-24 12:12:25,228 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:12:25,228 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2018-10-24 12:12:25,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-24 12:12:25,229 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:12:25,229 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:12:25,229 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:12:25,229 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:12:25,229 INFO L82 PathProgramCache]: Analyzing trace with hash 575772504, now seen corresponding path program 32 times [2018-10-24 12:12:25,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:12:25,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:25,230 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:12:25,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:12:25,231 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:12:25,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:12:26,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:12:26,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:26,139 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:12:26,140 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:12:26,140 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:12:26,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:12:26,140 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:12:26,155 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:12:26,155 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown