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-INT.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 15:33:51,753 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 15:33:51,755 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 15:33:51,768 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 15:33:51,768 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 15:33:51,769 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 15:33:51,770 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 15:33:51,772 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 15:33:51,774 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 15:33:51,775 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 15:33:51,776 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 15:33:51,776 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 15:33:51,777 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 15:33:51,778 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 15:33:51,779 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 15:33:51,780 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 15:33:51,781 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 15:33:51,783 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 15:33:51,785 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 15:33:51,786 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 15:33:51,788 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 15:33:51,789 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 15:33:51,791 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 15:33:51,792 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 15:33:51,792 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 15:33:51,793 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 15:33:51,794 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 15:33:51,795 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 15:33:51,796 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 15:33:51,797 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 15:33:51,797 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 15:33:51,798 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 15:33:51,798 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 15:33:51,798 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 15:33:51,799 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 15:33:51,800 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 15:33:51,801 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-10-27 15:33:51,816 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 15:33:51,816 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 15:33:51,817 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 15:33:51,818 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 15:33:51,818 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 15:33:51,818 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 15:33:51,818 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 15:33:51,818 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 15:33:51,819 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 15:33:51,819 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 15:33:51,819 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 15:33:51,819 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 15:33:51,820 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 15:33:51,820 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 15:33:51,820 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 15:33:51,821 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 15:33:51,821 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 15:33:51,821 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 15:33:51,821 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 15:33:51,822 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 15:33:51,822 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 15:33:51,822 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 15:33:51,822 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 15:33:51,822 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 15:33:51,823 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:33:51,823 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 15:33:51,823 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 15:33:51,823 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 15:33:51,823 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 15:33:51,824 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 15:33:51,824 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 15:33:51,824 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 15:33:51,824 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 15:33:51,824 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 15:33:51,875 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 15:33:51,893 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 15:33:51,898 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 15:33:51,900 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 15:33:51,900 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 15:33:51,901 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-10-27 15:33:51,954 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b2389185d/46fedc39c89742aebb6b761a6256842c/FLAG2e0a29746 [2018-10-27 15:33:52,416 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 15:33:52,417 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_true-unreach-call2_true-termination.i [2018-10-27 15:33:52,423 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b2389185d/46fedc39c89742aebb6b761a6256842c/FLAG2e0a29746 [2018-10-27 15:33:52,441 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b2389185d/46fedc39c89742aebb6b761a6256842c [2018-10-27 15:33:52,454 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 15:33:52,455 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 15:33:52,456 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 15:33:52,456 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 15:33:52,460 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 15:33:52,461 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,464 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@777de76b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52, skipping insertion in model container [2018-10-27 15:33:52,465 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,475 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 15:33:52,496 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 15:33:52,672 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:33:52,676 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 15:33:52,698 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:33:52,720 INFO L193 MainTranslator]: Completed translation [2018-10-27 15:33:52,721 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52 WrapperNode [2018-10-27 15:33:52,721 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 15:33:52,722 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 15:33:52,723 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 15:33:52,723 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 15:33:52,732 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,742 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,765 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 15:33:52,766 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 15:33:52,766 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 15:33:52,766 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 15:33:52,776 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,777 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,779 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,779 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,785 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,790 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,792 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (1/1) ... [2018-10-27 15:33:52,794 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 15:33:52,795 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 15:33:52,795 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 15:33:52,795 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 15:33:52,796 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:33:52,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 15:33:52,922 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 15:33:52,923 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 15:33:52,923 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 15:33:52,923 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 15:33:52,923 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 15:33:52,924 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 15:33:52,924 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 15:33:53,285 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 15:33:53,286 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:33:53 BoogieIcfgContainer [2018-10-27 15:33:53,286 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 15:33:53,287 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 15:33:53,287 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 15:33:53,291 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 15:33:53,291 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 03:33:52" (1/3) ... [2018-10-27 15:33:53,292 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c3bec61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:33:53, skipping insertion in model container [2018-10-27 15:33:53,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:33:52" (2/3) ... [2018-10-27 15:33:53,292 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c3bec61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:33:53, skipping insertion in model container [2018-10-27 15:33:53,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:33:53" (3/3) ... [2018-10-27 15:33:53,295 INFO L112 eAbstractionObserver]: Analyzing ICFG array_true-unreach-call2_true-termination.i [2018-10-27 15:33:53,305 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 15:33:53,314 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 15:33:53,332 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 15:33:53,368 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 15:33:53,368 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 15:33:53,369 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 15:33:53,369 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 15:33:53,369 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 15:33:53,369 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 15:33:53,369 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 15:33:53,369 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 15:33:53,396 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-27 15:33:53,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-27 15:33:53,403 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:53,404 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:53,406 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:53,413 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:53,413 INFO L82 PathProgramCache]: Analyzing trace with hash -173834890, now seen corresponding path program 1 times [2018-10-27 15:33:53,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:53,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:53,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:53,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:53,470 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:53,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:53,565 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:53,568 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:33:53,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 15:33:53,568 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:33:53,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 15:33:53,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 15:33:53,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:33:53,587 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-27 15:33:53,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:53,611 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-27 15:33:53,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 15:33:53,612 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2018-10-27 15:33:53,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:53,622 INFO L225 Difference]: With dead ends: 35 [2018-10-27 15:33:53,622 INFO L226 Difference]: Without dead ends: 15 [2018-10-27 15:33:53,626 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:33:53,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-27 15:33:53,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-27 15:33:53,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-27 15:33:53,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-27 15:33:53,669 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-27 15:33:53,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:53,670 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-27 15:33:53,670 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 15:33:53,670 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-27 15:33:53,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 15:33:53,671 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:53,671 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:53,671 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:53,672 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:53,672 INFO L82 PathProgramCache]: Analyzing trace with hash -737648989, now seen corresponding path program 1 times [2018-10-27 15:33:53,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:53,673 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:53,673 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:53,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:53,674 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:53,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:53,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:53,810 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:33:53,810 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 15:33:53,810 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:33:53,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 15:33:53,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 15:33:53,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:33:53,818 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 3 states. [2018-10-27 15:33:53,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:53,900 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-27 15:33:53,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 15:33:53,904 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-10-27 15:33:53,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:53,906 INFO L225 Difference]: With dead ends: 24 [2018-10-27 15:33:53,906 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 15:33:53,908 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:33:53,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 15:33:53,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-27 15:33:53,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-27 15:33:53,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-27 15:33:53,916 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-10-27 15:33:53,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:53,917 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-27 15:33:53,917 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 15:33:53,917 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-27 15:33:53,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-27 15:33:53,918 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:53,918 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:53,919 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:53,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:53,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1154592614, now seen corresponding path program 1 times [2018-10-27 15:33:53,920 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:53,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:53,922 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:53,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:53,922 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:53,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:54,050 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:54,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:54,050 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:54,052 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-10-27 15:33:54,054 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [35], [36], [37], [39] [2018-10-27 15:33:54,091 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:33:54,091 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:33:54,379 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:33:54,382 INFO L272 AbstractInterpreter]: Visited 15 different actions 35 times. Merged at 3 different actions 15 times. Widened at 1 different actions 1 times. Found 1 fixpoints after 1 different actions. Largest state had 34 variables. [2018-10-27 15:33:54,405 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:54,406 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:33:54,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:54,407 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:54,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:54,416 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:54,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:54,477 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:54,532 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:54,532 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:54,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:54,679 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:54,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-27 15:33:54,680 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:54,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 15:33:54,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 15:33:54,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 15:33:54,682 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 5 states. [2018-10-27 15:33:54,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:54,809 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 15:33:54,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 15:33:54,810 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2018-10-27 15:33:54,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:54,811 INFO L225 Difference]: With dead ends: 27 [2018-10-27 15:33:54,811 INFO L226 Difference]: Without dead ends: 21 [2018-10-27 15:33:54,812 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 15:33:54,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-27 15:33:54,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2018-10-27 15:33:54,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 15:33:54,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-27 15:33:54,817 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2018-10-27 15:33:54,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:54,817 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-27 15:33:54,817 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 15:33:54,818 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-27 15:33:54,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-27 15:33:54,818 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:54,819 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:54,819 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:54,819 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:54,819 INFO L82 PathProgramCache]: Analyzing trace with hash -1276704957, now seen corresponding path program 2 times [2018-10-27 15:33:54,820 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:54,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:54,821 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:54,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:54,821 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:54,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:54,915 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:54,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:54,916 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:54,916 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:54,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:54,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:54,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:54,927 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:54,927 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:54,997 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 15:33:54,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:55,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:55,090 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:55,091 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:55,261 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:55,283 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:55,283 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-27 15:33:55,283 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:55,283 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 15:33:55,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 15:33:55,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 15:33:55,285 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 6 states. [2018-10-27 15:33:55,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:55,327 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-27 15:33:55,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 15:33:55,329 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-10-27 15:33:55,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:55,330 INFO L225 Difference]: With dead ends: 30 [2018-10-27 15:33:55,331 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 15:33:55,331 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 15:33:55,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 15:33:55,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-27 15:33:55,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-27 15:33:55,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-27 15:33:55,341 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2018-10-27 15:33:55,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:55,341 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-27 15:33:55,342 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 15:33:55,342 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-27 15:33:55,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-27 15:33:55,343 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:55,343 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:55,344 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:55,344 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:55,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1288215558, now seen corresponding path program 3 times [2018-10-27 15:33:55,344 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:55,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:55,346 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:55,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:55,346 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:55,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:55,537 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:55,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:55,538 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:55,538 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:55,539 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:55,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:55,540 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:55,556 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:55,556 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:55,606 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:55,606 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:55,609 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:55,645 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:55,645 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:55,793 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:55,820 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:55,821 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-10-27 15:33:55,821 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:55,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 15:33:55,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 15:33:55,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-27 15:33:55,822 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 7 states. [2018-10-27 15:33:55,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:55,866 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 15:33:55,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 15:33:55,866 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2018-10-27 15:33:55,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:55,868 INFO L225 Difference]: With dead ends: 33 [2018-10-27 15:33:55,868 INFO L226 Difference]: Without dead ends: 27 [2018-10-27 15:33:55,869 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-27 15:33:55,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-27 15:33:55,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-27 15:33:55,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 15:33:55,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-27 15:33:55,874 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2018-10-27 15:33:55,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:55,875 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-27 15:33:55,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 15:33:55,875 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-27 15:33:55,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 15:33:55,876 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:55,876 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:55,876 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:55,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:55,877 INFO L82 PathProgramCache]: Analyzing trace with hash -603146269, now seen corresponding path program 4 times [2018-10-27 15:33:55,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:55,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:55,878 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:55,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:55,879 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:55,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:56,079 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:56,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:56,080 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:56,080 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:56,080 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:56,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:56,080 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:56,099 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:56,099 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:56,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:56,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:56,271 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:56,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:56,472 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:56,496 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:56,496 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-27 15:33:56,496 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:56,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 15:33:56,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 15:33:56,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 15:33:56,498 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 8 states. [2018-10-27 15:33:56,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:56,558 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-27 15:33:56,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 15:33:56,560 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-27 15:33:56,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:56,561 INFO L225 Difference]: With dead ends: 36 [2018-10-27 15:33:56,561 INFO L226 Difference]: Without dead ends: 30 [2018-10-27 15:33:56,562 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 15:33:56,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-27 15:33:56,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-27 15:33:56,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-27 15:33:56,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-27 15:33:56,568 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2018-10-27 15:33:56,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:56,568 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-27 15:33:56,568 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 15:33:56,569 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-27 15:33:56,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-27 15:33:56,570 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:56,570 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:56,570 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:56,570 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:56,571 INFO L82 PathProgramCache]: Analyzing trace with hash -1388548262, now seen corresponding path program 5 times [2018-10-27 15:33:56,571 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:56,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:56,572 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:56,572 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:56,572 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:56,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:56,699 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:56,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:56,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:56,700 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:56,700 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:56,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:56,701 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:56,718 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:56,718 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:56,826 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 15:33:56,826 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:56,830 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:56,868 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:56,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:57,095 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:57,115 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:57,116 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-27 15:33:57,116 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:57,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:33:57,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:33:57,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 15:33:57,117 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 9 states. [2018-10-27 15:33:57,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:57,175 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 15:33:57,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 15:33:57,176 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2018-10-27 15:33:57,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:57,177 INFO L225 Difference]: With dead ends: 39 [2018-10-27 15:33:57,177 INFO L226 Difference]: Without dead ends: 33 [2018-10-27 15:33:57,178 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 15:33:57,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-27 15:33:57,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-27 15:33:57,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-27 15:33:57,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-27 15:33:57,182 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2018-10-27 15:33:57,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:57,183 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-27 15:33:57,183 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:33:57,183 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-27 15:33:57,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-27 15:33:57,184 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:57,184 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:57,185 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:57,185 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:57,185 INFO L82 PathProgramCache]: Analyzing trace with hash -317493117, now seen corresponding path program 6 times [2018-10-27 15:33:57,185 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:57,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:57,186 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:57,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:57,187 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:57,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:57,423 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:57,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:57,423 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:57,424 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:57,424 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:57,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:57,424 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:57,432 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:57,432 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:57,498 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:57,498 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:57,501 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:57,606 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:57,606 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:58,015 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:58,037 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:58,037 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-10-27 15:33:58,037 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:58,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 15:33:58,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 15:33:58,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-27 15:33:58,039 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 10 states. [2018-10-27 15:33:58,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:58,086 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-27 15:33:58,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 15:33:58,087 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-10-27 15:33:58,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:58,088 INFO L225 Difference]: With dead ends: 42 [2018-10-27 15:33:58,089 INFO L226 Difference]: Without dead ends: 36 [2018-10-27 15:33:58,089 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-27 15:33:58,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-27 15:33:58,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-27 15:33:58,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-27 15:33:58,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-27 15:33:58,094 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2018-10-27 15:33:58,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:58,094 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-27 15:33:58,095 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 15:33:58,095 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-27 15:33:58,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-27 15:33:58,096 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:58,096 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:58,096 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:58,096 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:58,096 INFO L82 PathProgramCache]: Analyzing trace with hash 174289594, now seen corresponding path program 7 times [2018-10-27 15:33:58,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:58,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:58,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:58,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:58,098 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:58,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:58,218 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:58,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:58,219 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:58,219 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:58,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:58,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:58,220 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:58,227 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:58,228 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:33:58,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:58,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:58,297 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:58,298 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:58,491 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:58,511 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:58,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-27 15:33:58,512 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:58,512 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 15:33:58,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 15:33:58,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 15:33:58,513 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 11 states. [2018-10-27 15:33:58,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:58,579 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 15:33:58,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 15:33:58,581 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2018-10-27 15:33:58,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:58,582 INFO L225 Difference]: With dead ends: 45 [2018-10-27 15:33:58,582 INFO L226 Difference]: Without dead ends: 39 [2018-10-27 15:33:58,583 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 15:33:58,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-27 15:33:58,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-27 15:33:58,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-27 15:33:58,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-27 15:33:58,588 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2018-10-27 15:33:58,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:58,588 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-27 15:33:58,589 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 15:33:58,589 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-27 15:33:58,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-27 15:33:58,590 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:58,590 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:58,590 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:58,590 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:58,591 INFO L82 PathProgramCache]: Analyzing trace with hash 739586339, now seen corresponding path program 8 times [2018-10-27 15:33:58,591 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:58,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:58,592 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:33:58,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:58,592 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:58,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:58,821 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:58,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:58,821 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:58,822 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:58,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:58,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:58,822 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:58,834 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:33:58,834 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:33:58,947 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 15:33:58,947 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:58,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:58,996 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:58,996 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:33:59,377 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:59,399 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:33:59,400 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-27 15:33:59,400 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:33:59,400 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 15:33:59,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 15:33:59,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 15:33:59,401 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 12 states. [2018-10-27 15:33:59,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:33:59,534 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-27 15:33:59,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 15:33:59,536 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2018-10-27 15:33:59,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:33:59,537 INFO L225 Difference]: With dead ends: 48 [2018-10-27 15:33:59,537 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 15:33:59,538 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 15:33:59,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 15:33:59,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-27 15:33:59,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-27 15:33:59,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-27 15:33:59,543 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2018-10-27 15:33:59,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:33:59,543 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-27 15:33:59,544 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 15:33:59,544 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-27 15:33:59,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-27 15:33:59,545 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:33:59,545 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:33:59,545 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:33:59,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:33:59,546 INFO L82 PathProgramCache]: Analyzing trace with hash 928149018, now seen corresponding path program 9 times [2018-10-27 15:33:59,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:33:59,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:59,547 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:33:59,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:33:59,547 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:33:59,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:33:59,836 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:59,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:59,836 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:33:59,836 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:33:59,837 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:33:59,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:33:59,837 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:33:59,852 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:33:59,852 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:33:59,910 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:33:59,910 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:33:59,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:33:59,975 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:33:59,975 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:00,286 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:00,308 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:00,308 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-10-27 15:34:00,309 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:00,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 15:34:00,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 15:34:00,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-27 15:34:00,310 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 13 states. [2018-10-27 15:34:00,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:00,365 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 15:34:00,365 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 15:34:00,365 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2018-10-27 15:34:00,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:00,367 INFO L225 Difference]: With dead ends: 51 [2018-10-27 15:34:00,367 INFO L226 Difference]: Without dead ends: 45 [2018-10-27 15:34:00,368 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-27 15:34:00,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-27 15:34:00,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-27 15:34:00,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-27 15:34:00,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-27 15:34:00,372 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2018-10-27 15:34:00,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:00,373 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-27 15:34:00,373 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 15:34:00,373 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-27 15:34:00,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-27 15:34:00,374 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:00,374 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:00,374 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:00,374 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:00,375 INFO L82 PathProgramCache]: Analyzing trace with hash 581695939, now seen corresponding path program 10 times [2018-10-27 15:34:00,375 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:00,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:00,376 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:00,376 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:00,376 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:00,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:01,161 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:01,161 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:01,161 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:01,162 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:01,162 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:01,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:01,162 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:01,183 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:01,183 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:01,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:01,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:01,264 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:01,264 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:01,565 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:01,588 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:01,589 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-27 15:34:01,589 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:01,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 15:34:01,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 15:34:01,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 15:34:01,590 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 14 states. [2018-10-27 15:34:01,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:01,645 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-27 15:34:01,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 15:34:01,649 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 43 [2018-10-27 15:34:01,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:01,650 INFO L225 Difference]: With dead ends: 54 [2018-10-27 15:34:01,650 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 15:34:01,651 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 15:34:01,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 15:34:01,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-27 15:34:01,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-27 15:34:01,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-27 15:34:01,656 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2018-10-27 15:34:01,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:01,657 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-27 15:34:01,657 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 15:34:01,657 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-27 15:34:01,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-27 15:34:01,658 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:01,658 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:01,658 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:01,658 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:01,659 INFO L82 PathProgramCache]: Analyzing trace with hash 204431738, now seen corresponding path program 11 times [2018-10-27 15:34:01,659 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:01,659 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:01,660 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:01,660 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:01,660 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:01,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:01,937 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:01,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:01,938 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:01,938 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:01,938 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:01,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:01,938 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:01,946 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:01,946 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:34:02,142 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 15:34:02,142 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:02,146 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:02,181 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:02,181 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:02,454 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:02,484 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:02,485 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-27 15:34:02,485 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:02,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 15:34:02,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 15:34:02,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 15:34:02,486 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 15 states. [2018-10-27 15:34:02,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:02,572 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 15:34:02,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 15:34:02,572 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 46 [2018-10-27 15:34:02,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:02,573 INFO L225 Difference]: With dead ends: 57 [2018-10-27 15:34:02,574 INFO L226 Difference]: Without dead ends: 51 [2018-10-27 15:34:02,575 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 15:34:02,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-27 15:34:02,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-27 15:34:02,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-27 15:34:02,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-27 15:34:02,580 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2018-10-27 15:34:02,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:02,580 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-27 15:34:02,581 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 15:34:02,581 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-27 15:34:02,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-27 15:34:02,581 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:02,582 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:02,582 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:02,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:02,582 INFO L82 PathProgramCache]: Analyzing trace with hash 1056033379, now seen corresponding path program 12 times [2018-10-27 15:34:02,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:02,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:02,583 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:02,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:02,583 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:02,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:02,814 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:02,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:02,815 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:02,815 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:02,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:02,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:02,815 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:02,826 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:34:02,827 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:34:02,891 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:34:02,891 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:02,894 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:02,918 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:02,918 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:03,176 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:03,197 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:03,197 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-10-27 15:34:03,197 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:03,197 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 15:34:03,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 15:34:03,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-27 15:34:03,198 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 16 states. [2018-10-27 15:34:03,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:03,306 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-27 15:34:03,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 15:34:03,307 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 49 [2018-10-27 15:34:03,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:03,308 INFO L225 Difference]: With dead ends: 60 [2018-10-27 15:34:03,308 INFO L226 Difference]: Without dead ends: 54 [2018-10-27 15:34:03,309 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-27 15:34:03,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-27 15:34:03,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-27 15:34:03,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-27 15:34:03,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-27 15:34:03,314 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 49 [2018-10-27 15:34:03,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:03,315 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-27 15:34:03,315 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 15:34:03,315 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-27 15:34:03,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-27 15:34:03,316 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:03,316 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:03,316 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:03,317 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:03,317 INFO L82 PathProgramCache]: Analyzing trace with hash 748702938, now seen corresponding path program 13 times [2018-10-27 15:34:03,317 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:03,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:03,318 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:03,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:03,318 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:03,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:03,520 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:03,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:03,520 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:03,520 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:03,521 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:03,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:03,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:03,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:03,529 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:03,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:03,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:03,710 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:03,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:04,101 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:04,121 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:04,122 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-27 15:34:04,122 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:04,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 15:34:04,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 15:34:04,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 15:34:04,123 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 17 states. [2018-10-27 15:34:04,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:04,242 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-27 15:34:04,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 15:34:04,242 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2018-10-27 15:34:04,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:04,244 INFO L225 Difference]: With dead ends: 63 [2018-10-27 15:34:04,244 INFO L226 Difference]: Without dead ends: 57 [2018-10-27 15:34:04,245 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 15:34:04,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-27 15:34:04,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-27 15:34:04,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-27 15:34:04,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-27 15:34:04,258 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 52 [2018-10-27 15:34:04,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:04,258 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-27 15:34:04,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 15:34:04,259 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-27 15:34:04,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-27 15:34:04,259 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:04,259 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:04,264 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:04,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:04,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1937810179, now seen corresponding path program 14 times [2018-10-27 15:34:04,264 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:04,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:04,265 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:04,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:04,265 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:04,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:04,652 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:04,652 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:04,652 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:04,653 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:04,653 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:04,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:04,653 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:04,661 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:04,662 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:34:04,963 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 15:34:04,963 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:04,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:04,994 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:04,994 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:05,476 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:05,498 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:05,498 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-27 15:34:05,499 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:05,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 15:34:05,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 15:34:05,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 15:34:05,500 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 18 states. [2018-10-27 15:34:05,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:05,585 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-27 15:34:05,586 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 15:34:05,586 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 55 [2018-10-27 15:34:05,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:05,587 INFO L225 Difference]: With dead ends: 66 [2018-10-27 15:34:05,587 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 15:34:05,588 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 15:34:05,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 15:34:05,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-27 15:34:05,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-27 15:34:05,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-27 15:34:05,593 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 55 [2018-10-27 15:34:05,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:05,594 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-27 15:34:05,594 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 15:34:05,594 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-27 15:34:05,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-27 15:34:05,595 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:05,595 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:05,595 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:05,595 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:05,596 INFO L82 PathProgramCache]: Analyzing trace with hash 1741369402, now seen corresponding path program 15 times [2018-10-27 15:34:05,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:05,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:05,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:05,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:05,597 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:05,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:06,319 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:06,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:06,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:06,320 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:06,320 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:06,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:06,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:06,327 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:34:06,327 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:34:06,396 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:34:06,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:06,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:06,451 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:06,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:07,328 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:07,349 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:07,350 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2018-10-27 15:34:07,350 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:07,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 15:34:07,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 15:34:07,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 15:34:07,351 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 19 states. [2018-10-27 15:34:07,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:07,491 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-27 15:34:07,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 15:34:07,492 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 58 [2018-10-27 15:34:07,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:07,492 INFO L225 Difference]: With dead ends: 69 [2018-10-27 15:34:07,493 INFO L226 Difference]: Without dead ends: 63 [2018-10-27 15:34:07,493 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 15:34:07,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-27 15:34:07,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-10-27 15:34:07,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-27 15:34:07,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-27 15:34:07,498 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 58 [2018-10-27 15:34:07,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:07,498 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-27 15:34:07,498 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 15:34:07,498 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-27 15:34:07,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-27 15:34:07,499 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:07,499 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:07,500 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:07,500 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:07,500 INFO L82 PathProgramCache]: Analyzing trace with hash -680361053, now seen corresponding path program 16 times [2018-10-27 15:34:07,500 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:07,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:07,501 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:07,501 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:07,501 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:07,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:07,883 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:07,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:07,883 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:07,883 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:07,883 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:07,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:07,884 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:07,894 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:07,895 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:07,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:07,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:08,010 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:08,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:09,068 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:09,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:09,094 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-27 15:34:09,094 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:09,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 15:34:09,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 15:34:09,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 15:34:09,096 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 20 states. [2018-10-27 15:34:09,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:09,188 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-27 15:34:09,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 15:34:09,189 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 61 [2018-10-27 15:34:09,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:09,190 INFO L225 Difference]: With dead ends: 72 [2018-10-27 15:34:09,190 INFO L226 Difference]: Without dead ends: 66 [2018-10-27 15:34:09,191 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 15:34:09,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-27 15:34:09,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-27 15:34:09,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-27 15:34:09,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-10-27 15:34:09,196 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 61 [2018-10-27 15:34:09,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:09,196 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-10-27 15:34:09,196 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 15:34:09,196 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-10-27 15:34:09,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-27 15:34:09,197 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:09,197 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:09,197 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:09,197 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:09,198 INFO L82 PathProgramCache]: Analyzing trace with hash 408292250, now seen corresponding path program 17 times [2018-10-27 15:34:09,198 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:09,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:09,199 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:09,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:09,199 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:09,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:09,983 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:09,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:09,984 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:09,984 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:09,984 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:09,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:09,984 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:09,995 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:09,995 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:34:10,576 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 15:34:10,576 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:10,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:10,609 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:10,609 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:11,163 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:11,185 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:11,185 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-27 15:34:11,185 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:11,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 15:34:11,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 15:34:11,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 15:34:11,186 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 21 states. [2018-10-27 15:34:11,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:11,268 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-27 15:34:11,269 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 15:34:11,269 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-10-27 15:34:11,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:11,270 INFO L225 Difference]: With dead ends: 75 [2018-10-27 15:34:11,270 INFO L226 Difference]: Without dead ends: 69 [2018-10-27 15:34:11,271 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 15:34:11,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-27 15:34:11,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-27 15:34:11,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-27 15:34:11,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-10-27 15:34:11,276 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 64 [2018-10-27 15:34:11,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:11,276 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-10-27 15:34:11,276 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 15:34:11,276 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-10-27 15:34:11,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-27 15:34:11,277 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:11,277 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:11,278 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:11,278 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:11,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1180789827, now seen corresponding path program 18 times [2018-10-27 15:34:11,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:11,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:11,279 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:11,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:11,279 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:11,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:11,572 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:11,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:11,572 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:11,572 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:11,572 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:11,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:11,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:11,582 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:34:11,582 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:34:11,661 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:34:11,661 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:11,664 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:11,682 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:11,682 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:12,140 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:12,160 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:12,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-10-27 15:34:12,161 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:12,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 15:34:12,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 15:34:12,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 15:34:12,162 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 22 states. [2018-10-27 15:34:12,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:12,247 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-27 15:34:12,248 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 15:34:12,248 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 67 [2018-10-27 15:34:12,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:12,249 INFO L225 Difference]: With dead ends: 78 [2018-10-27 15:34:12,249 INFO L226 Difference]: Without dead ends: 72 [2018-10-27 15:34:12,250 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 15:34:12,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-27 15:34:12,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-10-27 15:34:12,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-27 15:34:12,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-10-27 15:34:12,255 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 67 [2018-10-27 15:34:12,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:12,255 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-10-27 15:34:12,255 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 15:34:12,255 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-10-27 15:34:12,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-27 15:34:12,256 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:12,256 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:12,256 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:12,256 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:12,256 INFO L82 PathProgramCache]: Analyzing trace with hash -2073633030, now seen corresponding path program 19 times [2018-10-27 15:34:12,256 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:12,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:12,257 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:12,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:12,257 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:12,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:12,649 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:12,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:12,650 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:12,650 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:12,650 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:12,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:12,650 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:12,659 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:12,660 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:12,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:12,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:12,766 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:12,766 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:13,264 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:13,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:13,285 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-27 15:34:13,285 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:13,285 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 15:34:13,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 15:34:13,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 15:34:13,287 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 23 states. [2018-10-27 15:34:13,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:13,410 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-27 15:34:13,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 15:34:13,410 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 70 [2018-10-27 15:34:13,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:13,411 INFO L225 Difference]: With dead ends: 81 [2018-10-27 15:34:13,411 INFO L226 Difference]: Without dead ends: 75 [2018-10-27 15:34:13,412 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 15:34:13,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-27 15:34:13,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-27 15:34:13,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-27 15:34:13,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-10-27 15:34:13,415 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 70 [2018-10-27 15:34:13,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:13,416 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-10-27 15:34:13,416 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 15:34:13,416 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-10-27 15:34:13,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-27 15:34:13,417 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:13,417 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:13,417 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:13,417 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:13,417 INFO L82 PathProgramCache]: Analyzing trace with hash 6773987, now seen corresponding path program 20 times [2018-10-27 15:34:13,417 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:13,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:13,423 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:13,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:13,424 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:13,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:13,837 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:13,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:13,837 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:13,837 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:13,837 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:13,838 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:13,838 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:13,846 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:13,847 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:34:15,579 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 15:34:15,579 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:15,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:15,615 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:15,615 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:16,264 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:16,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:16,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-27 15:34:16,288 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:16,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 15:34:16,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 15:34:16,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 15:34:16,290 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 24 states. [2018-10-27 15:34:16,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:16,408 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-27 15:34:16,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 15:34:16,411 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 73 [2018-10-27 15:34:16,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:16,413 INFO L225 Difference]: With dead ends: 84 [2018-10-27 15:34:16,413 INFO L226 Difference]: Without dead ends: 78 [2018-10-27 15:34:16,414 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 15:34:16,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-27 15:34:16,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-27 15:34:16,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-27 15:34:16,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-10-27 15:34:16,418 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 73 [2018-10-27 15:34:16,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:16,418 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-10-27 15:34:16,419 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 15:34:16,419 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-10-27 15:34:16,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-27 15:34:16,419 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:16,420 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:16,420 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:16,420 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:16,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1034136154, now seen corresponding path program 21 times [2018-10-27 15:34:16,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:16,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:16,421 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:16,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:16,421 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:16,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:16,898 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:16,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:16,898 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:16,898 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:16,898 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:16,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:16,899 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:16,923 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:34:16,923 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:34:17,003 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:34:17,004 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:17,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:17,034 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:17,034 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:17,729 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:17,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:17,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2018-10-27 15:34:17,751 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:17,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 15:34:17,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 15:34:17,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 15:34:17,752 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 25 states. [2018-10-27 15:34:17,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:17,854 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-27 15:34:17,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 15:34:17,855 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 76 [2018-10-27 15:34:17,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:17,856 INFO L225 Difference]: With dead ends: 87 [2018-10-27 15:34:17,856 INFO L226 Difference]: Without dead ends: 81 [2018-10-27 15:34:17,858 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 15:34:17,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-27 15:34:17,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-10-27 15:34:17,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-27 15:34:17,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 80 transitions. [2018-10-27 15:34:17,861 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 80 transitions. Word has length 76 [2018-10-27 15:34:17,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:17,861 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 80 transitions. [2018-10-27 15:34:17,861 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 15:34:17,861 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 80 transitions. [2018-10-27 15:34:17,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-27 15:34:17,862 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:17,862 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:17,863 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:17,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:17,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1243501955, now seen corresponding path program 22 times [2018-10-27 15:34:17,863 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:17,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:17,864 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:17,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:17,864 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:17,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:18,385 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:18,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:18,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:18,386 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:18,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:18,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:18,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:18,395 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:18,395 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:18,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:18,485 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:18,538 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:18,538 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:19,140 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:19,160 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:19,160 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-27 15:34:19,160 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:19,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 15:34:19,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 15:34:19,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 15:34:19,162 INFO L87 Difference]: Start difference. First operand 80 states and 80 transitions. Second operand 26 states. [2018-10-27 15:34:19,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:19,300 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-27 15:34:19,301 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 15:34:19,301 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 79 [2018-10-27 15:34:19,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:19,302 INFO L225 Difference]: With dead ends: 90 [2018-10-27 15:34:19,302 INFO L226 Difference]: Without dead ends: 84 [2018-10-27 15:34:19,303 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 15:34:19,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-27 15:34:19,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-10-27 15:34:19,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-27 15:34:19,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-10-27 15:34:19,307 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 79 [2018-10-27 15:34:19,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:19,307 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-10-27 15:34:19,307 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 15:34:19,307 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-10-27 15:34:19,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-10-27 15:34:19,308 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:19,308 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:19,308 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:19,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:19,308 INFO L82 PathProgramCache]: Analyzing trace with hash -2127401542, now seen corresponding path program 23 times [2018-10-27 15:34:19,309 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:19,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:19,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:19,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:19,310 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:19,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:20,339 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:20,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:20,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:20,340 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:20,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:20,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:20,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:20,348 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:20,348 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:34:30,706 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-27 15:34:30,707 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:30,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:30,737 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:30,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:31,427 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:31,452 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:31,452 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-27 15:34:31,452 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:31,452 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 15:34:31,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 15:34:31,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 15:34:31,454 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 27 states. [2018-10-27 15:34:31,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:31,579 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-27 15:34:31,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 15:34:31,579 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 82 [2018-10-27 15:34:31,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:31,580 INFO L225 Difference]: With dead ends: 93 [2018-10-27 15:34:31,580 INFO L226 Difference]: Without dead ends: 87 [2018-10-27 15:34:31,582 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 15:34:31,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-27 15:34:31,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-27 15:34:31,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-27 15:34:31,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 86 transitions. [2018-10-27 15:34:31,585 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 86 transitions. Word has length 82 [2018-10-27 15:34:31,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:31,585 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 86 transitions. [2018-10-27 15:34:31,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 15:34:31,586 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 86 transitions. [2018-10-27 15:34:31,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-27 15:34:31,586 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:31,586 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:31,587 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:31,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:31,587 INFO L82 PathProgramCache]: Analyzing trace with hash 211834403, now seen corresponding path program 24 times [2018-10-27 15:34:31,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:31,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:31,588 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:31,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:31,588 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:31,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:32,055 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:32,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:32,055 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:32,055 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:32,055 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:32,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:32,056 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:32,065 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:34:32,065 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:34:32,156 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:34:32,156 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:32,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:32,202 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:32,203 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:33,155 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:33,176 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:33,176 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-10-27 15:34:33,176 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:33,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 15:34:33,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 15:34:33,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 15:34:33,178 INFO L87 Difference]: Start difference. First operand 86 states and 86 transitions. Second operand 28 states. [2018-10-27 15:34:33,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:33,305 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-27 15:34:33,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-27 15:34:33,307 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 85 [2018-10-27 15:34:33,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:33,308 INFO L225 Difference]: With dead ends: 96 [2018-10-27 15:34:33,308 INFO L226 Difference]: Without dead ends: 90 [2018-10-27 15:34:33,309 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 15:34:33,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-27 15:34:33,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-27 15:34:33,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-27 15:34:33,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-10-27 15:34:33,312 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 85 [2018-10-27 15:34:33,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:33,313 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-10-27 15:34:33,313 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 15:34:33,313 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-10-27 15:34:33,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-27 15:34:33,313 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:33,314 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:33,314 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:33,314 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:33,314 INFO L82 PathProgramCache]: Analyzing trace with hash -1749472998, now seen corresponding path program 25 times [2018-10-27 15:34:33,314 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:33,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:33,315 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:33,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:33,315 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:33,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:34,188 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:34,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:34,189 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:34,189 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:34,189 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:34,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:34,189 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:34,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:34,196 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:34,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:34,293 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:34,312 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:34,312 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:35,881 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:35,902 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:35,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-27 15:34:35,902 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:35,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 15:34:35,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 15:34:35,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 15:34:35,904 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 29 states. [2018-10-27 15:34:36,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:36,007 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-27 15:34:36,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 15:34:36,008 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 88 [2018-10-27 15:34:36,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:36,009 INFO L225 Difference]: With dead ends: 99 [2018-10-27 15:34:36,009 INFO L226 Difference]: Without dead ends: 93 [2018-10-27 15:34:36,011 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 15:34:36,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-27 15:34:36,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-10-27 15:34:36,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-27 15:34:36,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2018-10-27 15:34:36,015 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 88 [2018-10-27 15:34:36,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:36,015 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2018-10-27 15:34:36,015 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 15:34:36,015 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2018-10-27 15:34:36,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-27 15:34:36,016 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:36,016 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:36,016 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:36,016 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:36,017 INFO L82 PathProgramCache]: Analyzing trace with hash 1971805891, now seen corresponding path program 26 times [2018-10-27 15:34:36,017 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:36,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:36,017 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:36,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:36,018 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:36,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:36,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:36,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:36,417 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:36,417 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:36,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:36,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:36,417 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:36,424 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:36,424 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:34:45,042 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-27 15:34:45,042 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:45,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:45,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:45,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:46,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:46,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:46,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-27 15:34:46,169 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:46,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 15:34:46,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 15:34:46,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 15:34:46,171 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 30 states. [2018-10-27 15:34:46,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:46,280 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-27 15:34:46,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 15:34:46,281 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 91 [2018-10-27 15:34:46,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:46,282 INFO L225 Difference]: With dead ends: 102 [2018-10-27 15:34:46,282 INFO L226 Difference]: Without dead ends: 96 [2018-10-27 15:34:46,284 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 15:34:46,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-27 15:34:46,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-10-27 15:34:46,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-10-27 15:34:46,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-10-27 15:34:46,287 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 91 [2018-10-27 15:34:46,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:46,288 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-10-27 15:34:46,288 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 15:34:46,288 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-10-27 15:34:46,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-27 15:34:46,288 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:46,289 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:46,289 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:46,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:46,289 INFO L82 PathProgramCache]: Analyzing trace with hash 895343738, now seen corresponding path program 27 times [2018-10-27 15:34:46,289 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:46,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:46,290 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:46,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:46,290 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:46,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:47,140 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:47,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:47,140 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:47,141 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:47,141 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:47,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:47,141 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:47,149 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:34:47,149 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:34:47,267 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:34:47,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:34:47,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:47,307 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:47,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:48,276 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:48,297 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:48,297 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2018-10-27 15:34:48,297 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:48,297 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 15:34:48,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 15:34:48,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 15:34:48,298 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 31 states. [2018-10-27 15:34:48,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:48,413 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-27 15:34:48,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 15:34:48,417 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 94 [2018-10-27 15:34:48,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:48,418 INFO L225 Difference]: With dead ends: 105 [2018-10-27 15:34:48,418 INFO L226 Difference]: Without dead ends: 99 [2018-10-27 15:34:48,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 15:34:48,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-27 15:34:48,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-27 15:34:48,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-27 15:34:48,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 98 transitions. [2018-10-27 15:34:48,425 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 98 transitions. Word has length 94 [2018-10-27 15:34:48,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:48,425 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 98 transitions. [2018-10-27 15:34:48,425 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 15:34:48,425 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 98 transitions. [2018-10-27 15:34:48,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-27 15:34:48,428 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:48,428 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:48,428 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:48,428 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:48,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1762824349, now seen corresponding path program 28 times [2018-10-27 15:34:48,428 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:48,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:48,429 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:34:48,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:48,429 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:48,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:48,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:48,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:48,952 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:48,952 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:48,952 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:48,952 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:48,953 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:48,960 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:48,960 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:34:49,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:49,062 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:34:49,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:49,087 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:34:50,002 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:50,023 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:34:50,023 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-27 15:34:50,023 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:34:50,023 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 15:34:50,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 15:34:50,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 15:34:50,026 INFO L87 Difference]: Start difference. First operand 98 states and 98 transitions. Second operand 32 states. [2018-10-27 15:34:50,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:34:50,172 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-27 15:34:50,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 15:34:50,173 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 97 [2018-10-27 15:34:50,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:34:50,173 INFO L225 Difference]: With dead ends: 108 [2018-10-27 15:34:50,174 INFO L226 Difference]: Without dead ends: 102 [2018-10-27 15:34:50,175 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 15:34:50,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-27 15:34:50,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-27 15:34:50,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-27 15:34:50,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-10-27 15:34:50,179 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 97 [2018-10-27 15:34:50,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:34:50,179 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-10-27 15:34:50,179 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 15:34:50,179 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-10-27 15:34:50,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-10-27 15:34:50,180 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:34:50,180 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:34:50,180 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:34:50,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:34:50,181 INFO L82 PathProgramCache]: Analyzing trace with hash -641300518, now seen corresponding path program 29 times [2018-10-27 15:34:50,181 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:34:50,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:50,181 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:34:50,182 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:34:50,182 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:34:50,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:34:51,519 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:34:51,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:51,519 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:34:51,519 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:34:51,520 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:34:51,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:34:51,520 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:34:51,527 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:34:51,527 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:35:13,316 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-27 15:35:13,317 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:13,328 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:13,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:13,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:14,581 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:14,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:14,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-27 15:35:14,605 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:14,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 15:35:14,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 15:35:14,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 15:35:14,606 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 33 states. [2018-10-27 15:35:14,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:14,815 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-27 15:35:14,816 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 15:35:14,816 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 100 [2018-10-27 15:35:14,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:14,817 INFO L225 Difference]: With dead ends: 111 [2018-10-27 15:35:14,817 INFO L226 Difference]: Without dead ends: 105 [2018-10-27 15:35:14,820 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 15:35:14,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-27 15:35:14,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-10-27 15:35:14,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-10-27 15:35:14,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 104 transitions. [2018-10-27 15:35:14,824 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 104 transitions. Word has length 100 [2018-10-27 15:35:14,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:14,824 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 104 transitions. [2018-10-27 15:35:14,825 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 15:35:14,825 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 104 transitions. [2018-10-27 15:35:14,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-27 15:35:14,825 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:14,826 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:14,826 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:14,827 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:14,827 INFO L82 PathProgramCache]: Analyzing trace with hash 124553219, now seen corresponding path program 30 times [2018-10-27 15:35:14,827 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:14,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:14,828 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:14,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:14,828 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:14,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:15,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:15,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:15,450 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:15,450 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:15,450 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:15,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:15,450 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:15,457 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:35:15,457 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:35:15,567 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:35:15,568 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:15,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:15,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:15,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:17,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:17,376 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:17,376 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-10-27 15:35:17,376 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:17,377 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 15:35:17,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 15:35:17,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 15:35:17,378 INFO L87 Difference]: Start difference. First operand 104 states and 104 transitions. Second operand 34 states. [2018-10-27 15:35:17,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:17,556 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-27 15:35:17,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-27 15:35:17,556 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 103 [2018-10-27 15:35:17,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:17,558 INFO L225 Difference]: With dead ends: 114 [2018-10-27 15:35:17,558 INFO L226 Difference]: Without dead ends: 108 [2018-10-27 15:35:17,559 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 15:35:17,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-27 15:35:17,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-10-27 15:35:17,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-27 15:35:17,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2018-10-27 15:35:17,562 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 103 [2018-10-27 15:35:17,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:17,563 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2018-10-27 15:35:17,563 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 15:35:17,563 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2018-10-27 15:35:17,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-27 15:35:17,564 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:17,564 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:17,564 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:17,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:17,564 INFO L82 PathProgramCache]: Analyzing trace with hash 806955834, now seen corresponding path program 31 times [2018-10-27 15:35:17,565 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:17,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:17,565 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:17,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:17,565 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:17,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:18,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:18,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:18,081 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:18,081 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:18,082 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:18,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:18,082 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:18,090 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:35:18,090 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:35:18,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:18,198 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:18,224 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:18,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:19,323 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:19,343 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:19,344 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-27 15:35:19,344 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:19,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 15:35:19,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 15:35:19,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 15:35:19,345 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 35 states. [2018-10-27 15:35:19,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:19,487 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-27 15:35:19,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 15:35:19,488 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 106 [2018-10-27 15:35:19,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:19,489 INFO L225 Difference]: With dead ends: 117 [2018-10-27 15:35:19,490 INFO L226 Difference]: Without dead ends: 111 [2018-10-27 15:35:19,491 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 15:35:19,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-27 15:35:19,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-10-27 15:35:19,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-27 15:35:19,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 110 transitions. [2018-10-27 15:35:19,494 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 110 transitions. Word has length 106 [2018-10-27 15:35:19,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:19,494 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 110 transitions. [2018-10-27 15:35:19,494 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 15:35:19,495 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 110 transitions. [2018-10-27 15:35:19,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-27 15:35:19,495 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:19,495 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:19,496 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:19,496 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:19,496 INFO L82 PathProgramCache]: Analyzing trace with hash -2111919965, now seen corresponding path program 32 times [2018-10-27 15:35:19,496 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:19,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:19,497 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:35:19,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:19,497 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:19,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:20,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:20,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:20,140 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:20,140 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:20,140 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:20,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:20,140 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 [2018-10-27 15:35:20,168 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:35:20,168 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:35:51,821 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-27 15:35:51,821 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:51,835 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:51,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:51,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:53,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:53,161 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:53,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-27 15:35:53,161 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:53,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 15:35:53,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 15:35:53,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 15:35:53,163 INFO L87 Difference]: Start difference. First operand 110 states and 110 transitions. Second operand 36 states. [2018-10-27 15:35:53,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:53,293 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-27 15:35:53,294 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 15:35:53,294 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 109 [2018-10-27 15:35:53,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:53,295 INFO L225 Difference]: With dead ends: 120 [2018-10-27 15:35:53,295 INFO L226 Difference]: Without dead ends: 114 [2018-10-27 15:35:53,297 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 15:35:53,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-27 15:35:53,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-10-27 15:35:53,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-27 15:35:53,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2018-10-27 15:35:53,300 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 109 [2018-10-27 15:35:53,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:53,301 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2018-10-27 15:35:53,301 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 15:35:53,301 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2018-10-27 15:35:53,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2018-10-27 15:35:53,302 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:53,302 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:53,302 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:53,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:53,302 INFO L82 PathProgramCache]: Analyzing trace with hash 1861994138, now seen corresponding path program 33 times [2018-10-27 15:35:53,302 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:53,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:53,303 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:53,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:53,303 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:53,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:53,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:53,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:53,904 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:53,904 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:53,904 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:53,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:53,904 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:53,911 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:35:53,911 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:35:54,029 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:35:54,029 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:35:54,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:54,057 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:54,057 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:55,287 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:55,308 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:55,308 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2018-10-27 15:35:55,309 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:55,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 15:35:55,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 15:35:55,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 15:35:55,310 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 37 states. [2018-10-27 15:35:55,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:55,465 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-27 15:35:55,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-27 15:35:55,466 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 112 [2018-10-27 15:35:55,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:55,467 INFO L225 Difference]: With dead ends: 123 [2018-10-27 15:35:55,467 INFO L226 Difference]: Without dead ends: 117 [2018-10-27 15:35:55,468 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 15:35:55,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-27 15:35:55,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-10-27 15:35:55,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-10-27 15:35:55,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2018-10-27 15:35:55,471 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 112 [2018-10-27 15:35:55,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:55,471 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2018-10-27 15:35:55,471 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 15:35:55,471 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2018-10-27 15:35:55,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-27 15:35:55,471 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:55,472 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:55,472 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:55,472 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:55,472 INFO L82 PathProgramCache]: Analyzing trace with hash -2036477629, now seen corresponding path program 34 times [2018-10-27 15:35:55,472 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:55,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:55,473 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:35:55,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:55,473 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:55,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:56,120 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:56,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:56,120 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:56,121 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:56,121 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:56,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:56,121 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:56,128 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:35:56,128 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:35:56,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:56,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:35:56,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:56,373 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:35:58,000 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:58,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:35:58,021 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-27 15:35:58,021 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:35:58,021 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 15:35:58,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 15:35:58,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 15:35:58,022 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 38 states. [2018-10-27 15:35:58,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:35:58,151 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-27 15:35:58,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 15:35:58,152 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 115 [2018-10-27 15:35:58,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:35:58,153 INFO L225 Difference]: With dead ends: 126 [2018-10-27 15:35:58,153 INFO L226 Difference]: Without dead ends: 120 [2018-10-27 15:35:58,154 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 15:35:58,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-27 15:35:58,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2018-10-27 15:35:58,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-27 15:35:58,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2018-10-27 15:35:58,158 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 115 [2018-10-27 15:35:58,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:35:58,159 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2018-10-27 15:35:58,159 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 15:35:58,159 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2018-10-27 15:35:58,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-10-27 15:35:58,160 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:35:58,160 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:35:58,160 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:35:58,160 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:35:58,160 INFO L82 PathProgramCache]: Analyzing trace with hash -1198237190, now seen corresponding path program 35 times [2018-10-27 15:35:58,161 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:35:58,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:58,161 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:35:58,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:35:58,162 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:35:58,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:35:58,881 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:35:58,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:58,881 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:35:58,882 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:35:58,882 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:35:58,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:35:58,882 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:35:58,889 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:35:58,889 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:36:50,688 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-27 15:36:50,689 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:36:50,706 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:36:50,822 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:50,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:36:52,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:52,674 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:36:52,675 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-27 15:36:52,675 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:36:52,675 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 15:36:52,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 15:36:52,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 15:36:52,676 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 39 states. [2018-10-27 15:36:52,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:36:52,820 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-27 15:36:52,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 15:36:52,821 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 118 [2018-10-27 15:36:52,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:36:52,822 INFO L225 Difference]: With dead ends: 129 [2018-10-27 15:36:52,822 INFO L226 Difference]: Without dead ends: 123 [2018-10-27 15:36:52,823 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 15:36:52,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-27 15:36:52,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-10-27 15:36:52,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-27 15:36:52,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 122 transitions. [2018-10-27 15:36:52,826 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 122 transitions. Word has length 118 [2018-10-27 15:36:52,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:36:52,828 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 122 transitions. [2018-10-27 15:36:52,828 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 15:36:52,828 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 122 transitions. [2018-10-27 15:36:52,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-27 15:36:52,829 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:36:52,829 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:36:52,829 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:36:52,829 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:36:52,829 INFO L82 PathProgramCache]: Analyzing trace with hash -117177885, now seen corresponding path program 36 times [2018-10-27 15:36:52,830 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:36:52,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:36:52,830 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:36:52,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:36:52,830 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:36:52,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:36:53,655 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:53,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:36:53,656 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:36:53,656 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:36:53,656 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:36:53,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:36:53,656 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:36:53,663 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:36:53,663 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:36:53,792 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:36:53,792 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:36:53,796 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:36:53,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:53,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:36:55,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:55,451 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:36:55,451 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-10-27 15:36:55,451 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:36:55,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 15:36:55,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 15:36:55,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 15:36:55,452 INFO L87 Difference]: Start difference. First operand 122 states and 122 transitions. Second operand 40 states. [2018-10-27 15:36:56,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:36:56,123 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-27 15:36:56,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 15:36:56,124 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 121 [2018-10-27 15:36:56,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:36:56,125 INFO L225 Difference]: With dead ends: 132 [2018-10-27 15:36:56,125 INFO L226 Difference]: Without dead ends: 126 [2018-10-27 15:36:56,126 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 15:36:56,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-27 15:36:56,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-10-27 15:36:56,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-10-27 15:36:56,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2018-10-27 15:36:56,132 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 121 [2018-10-27 15:36:56,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:36:56,132 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2018-10-27 15:36:56,132 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 15:36:56,133 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2018-10-27 15:36:56,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-27 15:36:56,133 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:36:56,133 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:36:56,134 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:36:56,134 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:36:56,134 INFO L82 PathProgramCache]: Analyzing trace with hash 2055791962, now seen corresponding path program 37 times [2018-10-27 15:36:56,134 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:36:56,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:36:56,135 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:36:56,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:36:56,135 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:36:56,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:36:56,819 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:56,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:36:56,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:36:56,820 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:36:56,820 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:36:56,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:36:56,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:36:56,827 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:36:56,827 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:36:56,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:36:56,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:36:57,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:57,091 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:36:59,755 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:36:59,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:36:59,777 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-27 15:36:59,777 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:36:59,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 15:36:59,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 15:36:59,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 15:36:59,779 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 41 states. [2018-10-27 15:37:00,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:37:00,122 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-27 15:37:00,123 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 15:37:00,123 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 124 [2018-10-27 15:37:00,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:37:00,124 INFO L225 Difference]: With dead ends: 135 [2018-10-27 15:37:00,124 INFO L226 Difference]: Without dead ends: 129 [2018-10-27 15:37:00,124 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 15:37:00,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-27 15:37:00,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2018-10-27 15:37:00,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-27 15:37:00,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 128 transitions. [2018-10-27 15:37:00,129 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 128 transitions. Word has length 124 [2018-10-27 15:37:00,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:37:00,129 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 128 transitions. [2018-10-27 15:37:00,129 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 15:37:00,129 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 128 transitions. [2018-10-27 15:37:00,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-27 15:37:00,130 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:37:00,130 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:37:00,130 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:37:00,131 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:37:00,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1041548669, now seen corresponding path program 38 times [2018-10-27 15:37:00,131 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:37:00,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:00,132 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:37:00,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:37:00,132 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:37:00,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:37:00,883 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:37:00,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:00,883 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:37:00,884 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:37:00,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:37:00,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:37:00,884 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:37:00,891 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:37:00,891 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:38:19,398 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-27 15:38:19,398 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:38:19,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... Received shutdown request... [2018-10-27 15:38:19,438 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-27 15:38:19,639 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:38:19,639 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 15:38:19,645 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 15:38:19,646 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 03:38:19 BoogieIcfgContainer [2018-10-27 15:38:19,646 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 15:38:19,647 INFO L168 Benchmark]: Toolchain (without parser) took 267192.32 ms. Allocated memory was 1.5 GB in the beginning and 2.6 GB in the end (delta: 1.1 GB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -791.8 MB). Peak memory consumption was 334.9 MB. Max. memory is 7.1 GB. [2018-10-27 15:38:19,648 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:38:19,648 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.44 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 15:38:19,649 INFO L168 Benchmark]: Boogie Procedure Inliner took 43.08 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:38:19,649 INFO L168 Benchmark]: Boogie Preprocessor took 28.49 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:38:19,650 INFO L168 Benchmark]: RCFGBuilder took 491.64 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 720.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -772.6 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-10-27 15:38:19,650 INFO L168 Benchmark]: TraceAbstraction took 266358.56 ms. Allocated memory was 2.2 GB in the beginning and 2.6 GB in the end (delta: 405.8 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -29.7 MB). Peak memory consumption was 376.1 MB. Max. memory is 7.1 GB. [2018-10-27 15:38:19,655 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 265.44 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 43.08 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 28.49 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 491.64 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 720.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -772.6 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 266358.56 ms. Allocated memory was 2.2 GB in the beginning and 2.6 GB in the end (delta: 405.8 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -29.7 MB). Peak memory consumption was 376.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was analyzing trace of length 128 with TraceHistMax 39,while TraceCheckSpWp was constructing forward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 41 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. TIMEOUT Result, 266.2s OverallTime, 40 OverallIterations, 39 TraceHistogramMax, 5.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 516 SDtfs, 741 SDslu, 6309 SDs, 0 SdLazy, 2149 SolverSat, 54 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5962 GetRequests, 4444 SyntacticMatches, 0 SemanticMatches, 1518 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2812 ImplicationChecksByTransitivity, 46.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=128occurred in iteration=39, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 39 MinimizatonAttempts, 38 StatesRemovedByMinimization, 38 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.8s SsaConstructionTime, 129.4s SatisfiabilityAnalysisTime, 49.0s InterpolantComputationTime, 5205 NumberOfCodeBlocks, 5205 NumberOfCodeBlocksAsserted, 310 NumberOfCheckSat, 7682 ConstructedInterpolants, 0 QuantifiedInterpolants, 1774204 SizeOfPredicates, 37 NumberOfNonLiveVariables, 19536 ConjunctsInSsa, 777 ConjunctsInUnsatCore, 113 InterpolantComputations, 2 PerfectInterpolantSequences, 0/80142 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown