java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loops/n.c24_false-unreach-call.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:04:51,643 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:04:51,646 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:04:51,661 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:04:51,662 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:04:51,663 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:04:51,664 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:04:51,666 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:04:51,668 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:04:51,669 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:04:51,670 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:04:51,671 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:04:51,672 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:04:51,673 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:04:51,674 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:04:51,675 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:04:51,676 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:04:51,678 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:04:51,680 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:04:51,682 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:04:51,684 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:04:51,685 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:04:51,688 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:04:51,689 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:04:51,689 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:04:51,690 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:04:51,691 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:04:51,692 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:04:51,693 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:04:51,694 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:04:51,695 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:04:51,695 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 12:04:51,696 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 12:04:51,696 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 12:04:51,697 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 12:04:51,698 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 12:04:51,698 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 12:04:51,714 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:04:51,714 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:04:51,715 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:04:51,715 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:04:51,718 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:04:51,719 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:04:51,719 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:04:51,719 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:04:51,719 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:04:51,719 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:04:51,720 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:04:51,720 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:04:51,721 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:04:51,721 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:04:51,721 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:04:51,721 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:04:51,721 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:04:51,722 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:04:51,722 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:04:51,722 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:04:51,722 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:04:51,722 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:04:51,723 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:04:51,723 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:04:51,723 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:04:51,723 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:04:51,723 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:04:51,724 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:04:51,724 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:04:51,724 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:04:51,724 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:04:51,724 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:04:51,725 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:04:51,726 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:04:51,786 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:04:51,805 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:04:51,809 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:04:51,810 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:04:51,811 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:04:51,812 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/n.c24_false-unreach-call.i [2018-10-24 12:04:51,887 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c4e349f5d/eb60e61820f24e07a98570c1c1db86e8/FLAG526222b43 [2018-10-24 12:04:52,378 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:04:52,379 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c24_false-unreach-call.i [2018-10-24 12:04:52,388 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c4e349f5d/eb60e61820f24e07a98570c1c1db86e8/FLAG526222b43 [2018-10-24 12:04:52,404 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/c4e349f5d/eb60e61820f24e07a98570c1c1db86e8 [2018-10-24 12:04:52,415 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:04:52,417 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:04:52,418 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:04:52,418 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:04:52,422 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:04:52,423 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,426 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44c4a7da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52, skipping insertion in model container [2018-10-24 12:04:52,427 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,437 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:04:52,471 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:04:52,689 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:04:52,699 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:04:52,754 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:04:52,790 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:04:52,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52 WrapperNode [2018-10-24 12:04:52,791 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:04:52,792 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:04:52,792 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:04:52,793 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:04:52,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,814 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,848 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:04:52,849 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:04:52,849 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:04:52,849 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:04:52,862 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,862 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,870 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,871 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,883 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,890 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,892 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (1/1) ... [2018-10-24 12:04:52,896 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:04:52,897 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:04:52,897 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:04:52,897 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:04:52,907 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (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 [2018-10-24 12:04:53,050 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:04:53,051 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:04:53,051 INFO L130 BoogieDeclarations]: Found specification of procedure bar [2018-10-24 12:04:53,051 INFO L138 BoogieDeclarations]: Found implementation of procedure bar [2018-10-24 12:04:53,051 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:04:53,054 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:04:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2018-10-24 12:04:53,054 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2018-10-24 12:04:53,054 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memmove [2018-10-24 12:04:53,054 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memmove [2018-10-24 12:04:53,055 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:04:53,055 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:04:53,055 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:04:53,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:04:53,671 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:04:53,672 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:04:53 BoogieIcfgContainer [2018-10-24 12:04:53,672 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:04:53,673 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:04:53,673 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:04:53,676 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:04:53,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:04:52" (1/3) ... [2018-10-24 12:04:53,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@993c42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:04:53, skipping insertion in model container [2018-10-24 12:04:53,678 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:52" (2/3) ... [2018-10-24 12:04:53,678 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@993c42 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:04:53, skipping insertion in model container [2018-10-24 12:04:53,679 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:04:53" (3/3) ... [2018-10-24 12:04:53,682 INFO L112 eAbstractionObserver]: Analyzing ICFG n.c24_false-unreach-call.i [2018-10-24 12:04:53,694 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:04:53,703 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:04:53,721 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:04:53,757 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:04:53,757 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:04:53,758 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:04:53,758 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:04:53,758 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:04:53,758 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:04:53,759 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:04:53,759 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:04:53,780 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states. [2018-10-24 12:04:53,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:04:53,787 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:53,788 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:53,790 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:53,797 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:53,797 INFO L82 PathProgramCache]: Analyzing trace with hash 277346705, now seen corresponding path program 1 times [2018-10-24 12:04:53,800 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:53,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:53,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:53,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:53,854 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:53,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:53,950 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:53,952 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:04:53,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:04:53,953 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:53,957 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:04:53,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:04:53,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:04:53,974 INFO L87 Difference]: Start difference. First operand 55 states. Second operand 2 states. [2018-10-24 12:04:54,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:54,003 INFO L93 Difference]: Finished difference Result 101 states and 134 transitions. [2018-10-24 12:04:54,003 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:04:54,005 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-24 12:04:54,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:54,017 INFO L225 Difference]: With dead ends: 101 [2018-10-24 12:04:54,017 INFO L226 Difference]: Without dead ends: 48 [2018-10-24 12:04:54,022 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:04:54,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-24 12:04:54,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-24 12:04:54,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-24 12:04:54,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2018-10-24 12:04:54,067 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 13 [2018-10-24 12:04:54,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:54,068 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2018-10-24 12:04:54,068 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:04:54,068 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2018-10-24 12:04:54,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-24 12:04:54,069 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:54,069 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:54,070 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:54,070 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:54,070 INFO L82 PathProgramCache]: Analyzing trace with hash -1161873536, now seen corresponding path program 1 times [2018-10-24 12:04:54,071 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:54,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:54,072 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:54,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:54,072 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:54,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:54,189 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:54,189 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:04:54,190 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 12:04:54,190 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:54,191 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 12:04:54,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 12:04:54,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:04:54,196 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand 3 states. [2018-10-24 12:04:54,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:54,461 INFO L93 Difference]: Finished difference Result 113 states and 142 transitions. [2018-10-24 12:04:54,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 12:04:54,462 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-24 12:04:54,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:54,464 INFO L225 Difference]: With dead ends: 113 [2018-10-24 12:04:54,464 INFO L226 Difference]: Without dead ends: 74 [2018-10-24 12:04:54,466 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 12:04:54,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-24 12:04:54,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 52. [2018-10-24 12:04:54,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-24 12:04:54,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 61 transitions. [2018-10-24 12:04:54,481 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 61 transitions. Word has length 15 [2018-10-24 12:04:54,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:54,481 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 61 transitions. [2018-10-24 12:04:54,481 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 12:04:54,482 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 61 transitions. [2018-10-24 12:04:54,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 12:04:54,483 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:54,483 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:54,483 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:54,483 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:54,484 INFO L82 PathProgramCache]: Analyzing trace with hash 1375381986, now seen corresponding path program 1 times [2018-10-24 12:04:54,484 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:54,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:54,485 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:54,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:54,485 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:54,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:54,632 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:04:54,632 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:04:54,632 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:04:54,636 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 26 with the following transitions: [2018-10-24 12:04:54,638 INFO L202 CegarAbsIntRunner]: [2], [3], [17], [21], [24], [26], [28], [32], [36], [39], [41], [45], [49], [53], [56], [113], [120], [123], [125], [131], [132], [133], [141] [2018-10-24 12:04:54,696 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:04:54,697 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:04:54,931 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:04:56,914 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:04:56,916 INFO L272 AbstractInterpreter]: Visited 23 different actions 269 times. Merged at 10 different actions 204 times. Widened at 3 different actions 50 times. Found 2 fixpoints after 2 different actions. Largest state had 35 variables. [2018-10-24 12:04:56,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:56,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:04:56,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:04:56,963 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:04:56,977 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:56,977 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:04:57,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:57,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:04:57,172 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:04:57,172 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:04:57,462 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-24 12:04:57,497 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:04:57,498 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-24 12:04:57,498 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:04:57,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:04:57,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:04:57,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:04:57,499 INFO L87 Difference]: Start difference. First operand 52 states and 61 transitions. Second operand 5 states. [2018-10-24 12:04:57,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:57,956 INFO L93 Difference]: Finished difference Result 141 states and 180 transitions. [2018-10-24 12:04:57,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-24 12:04:57,957 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2018-10-24 12:04:57,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:57,959 INFO L225 Difference]: With dead ends: 141 [2018-10-24 12:04:57,961 INFO L226 Difference]: Without dead ends: 100 [2018-10-24 12:04:57,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:04:57,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-24 12:04:57,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 78. [2018-10-24 12:04:57,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-24 12:04:57,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 97 transitions. [2018-10-24 12:04:57,992 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 97 transitions. Word has length 25 [2018-10-24 12:04:57,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:57,992 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 97 transitions. [2018-10-24 12:04:57,992 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:04:57,992 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 97 transitions. [2018-10-24 12:04:57,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-24 12:04:57,995 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:57,997 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:57,997 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:57,997 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:57,997 INFO L82 PathProgramCache]: Analyzing trace with hash -103717632, now seen corresponding path program 2 times [2018-10-24 12:04:57,998 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:58,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:58,000 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:58,000 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:58,000 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:58,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:58,329 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-24 12:04:58,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:04:58,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:04:58,331 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:04:58,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:04:58,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:04:58,332 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:04:58,348 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:04:58,348 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:04:58,400 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-24 12:04:58,400 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:04:58,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:04:58,468 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-24 12:04:58,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:04:58,605 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-24 12:04:58,636 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-24 12:04:58,636 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5] total 11 [2018-10-24 12:04:58,636 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:58,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:04:58,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:04:58,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:04:58,638 INFO L87 Difference]: Start difference. First operand 78 states and 97 transitions. Second operand 5 states. [2018-10-24 12:04:58,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:58,743 INFO L93 Difference]: Finished difference Result 127 states and 166 transitions. [2018-10-24 12:04:58,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:04:58,744 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2018-10-24 12:04:58,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:58,747 INFO L225 Difference]: With dead ends: 127 [2018-10-24 12:04:58,747 INFO L226 Difference]: Without dead ends: 122 [2018-10-24 12:04:58,748 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:04:58,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-10-24 12:04:58,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 80. [2018-10-24 12:04:58,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-24 12:04:58,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 100 transitions. [2018-10-24 12:04:58,767 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 100 transitions. Word has length 35 [2018-10-24 12:04:58,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:58,767 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 100 transitions. [2018-10-24 12:04:58,768 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:04:58,768 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 100 transitions. [2018-10-24 12:04:58,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-24 12:04:58,769 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:58,769 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:58,770 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:58,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:58,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1875911917, now seen corresponding path program 1 times [2018-10-24 12:04:58,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:58,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:58,771 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:04:58,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:58,771 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:58,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:59,004 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:04:59,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:04:59,005 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:04:59,005 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 46 with the following transitions: [2018-10-24 12:04:59,005 INFO L202 CegarAbsIntRunner]: [2], [3], [4], [5], [17], [21], [24], [26], [28], [32], [36], [39], [41], [45], [49], [53], [56], [58], [60], [64], [67], [109], [113], [120], [123], [125], [131], [132], [133], [135], [136], [141] [2018-10-24 12:04:59,009 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:04:59,009 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:04:59,041 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:05:02,492 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:05:02,492 INFO L272 AbstractInterpreter]: Visited 32 different actions 948 times. Merged at 16 different actions 630 times. Widened at 5 different actions 144 times. Found 64 fixpoints after 6 different actions. Largest state had 37 variables. [2018-10-24 12:05:02,505 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:02,505 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:05:02,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:02,506 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:02,514 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:02,515 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:02,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:02,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:02,588 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:05:02,589 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:02,670 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:05:02,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:02,694 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-24 12:05:02,694 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:02,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:05:02,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:05:02,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:05:02,696 INFO L87 Difference]: Start difference. First operand 80 states and 100 transitions. Second operand 6 states. [2018-10-24 12:05:02,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:02,843 INFO L93 Difference]: Finished difference Result 205 states and 268 transitions. [2018-10-24 12:05:02,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:05:02,844 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2018-10-24 12:05:02,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:02,846 INFO L225 Difference]: With dead ends: 205 [2018-10-24 12:05:02,847 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:05:02,853 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:05:02,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:05:02,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 106. [2018-10-24 12:05:02,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-24 12:05:02,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 136 transitions. [2018-10-24 12:05:02,874 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 136 transitions. Word has length 45 [2018-10-24 12:05:02,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:02,874 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 136 transitions. [2018-10-24 12:05:02,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:05:02,875 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 136 transitions. [2018-10-24 12:05:02,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-24 12:05:02,877 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:02,877 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:02,878 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:02,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:02,878 INFO L82 PathProgramCache]: Analyzing trace with hash -588961457, now seen corresponding path program 2 times [2018-10-24 12:05:02,878 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:02,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:02,879 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:02,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:02,879 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:02,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:03,095 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2018-10-24 12:05:03,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:03,096 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:03,096 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:03,096 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:03,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:03,096 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:03,104 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:03,104 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:03,151 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:05:03,151 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:03,155 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:03,366 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-24 12:05:03,367 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:03,628 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-24 12:05:03,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:03,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 16 [2018-10-24 12:05:03,650 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:03,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:05:03,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:05:03,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:05:03,651 INFO L87 Difference]: Start difference. First operand 106 states and 136 transitions. Second operand 11 states. [2018-10-24 12:05:04,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:04,679 INFO L93 Difference]: Finished difference Result 462 states and 644 transitions. [2018-10-24 12:05:04,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:05:04,679 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 55 [2018-10-24 12:05:04,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:04,683 INFO L225 Difference]: With dead ends: 462 [2018-10-24 12:05:04,683 INFO L226 Difference]: Without dead ends: 370 [2018-10-24 12:05:04,685 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=224, Invalid=646, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:05:04,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2018-10-24 12:05:04,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 150. [2018-10-24 12:05:04,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-24 12:05:04,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 200 transitions. [2018-10-24 12:05:04,710 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 200 transitions. Word has length 55 [2018-10-24 12:05:04,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:04,710 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 200 transitions. [2018-10-24 12:05:04,710 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:05:04,710 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 200 transitions. [2018-10-24 12:05:04,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-24 12:05:04,714 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:04,714 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:04,714 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:04,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:04,715 INFO L82 PathProgramCache]: Analyzing trace with hash 175545882, now seen corresponding path program 3 times [2018-10-24 12:05:04,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:04,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:04,716 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:04,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:04,716 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:04,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:04,832 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-24 12:05:04,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:04,832 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:04,832 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:04,833 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:04,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:04,833 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:04,842 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:05:04,842 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:05:04,913 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:05:04,914 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:04,922 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:05,036 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-24 12:05:05,037 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:05,390 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-24 12:05:05,412 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:05,413 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-24 12:05:05,413 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:05,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:05:05,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:05:05,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:05:05,414 INFO L87 Difference]: Start difference. First operand 150 states and 200 transitions. Second operand 8 states. [2018-10-24 12:05:05,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:05,795 INFO L93 Difference]: Finished difference Result 375 states and 518 transitions. [2018-10-24 12:05:05,795 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:05:05,795 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 75 [2018-10-24 12:05:05,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:05,798 INFO L225 Difference]: With dead ends: 375 [2018-10-24 12:05:05,798 INFO L226 Difference]: Without dead ends: 245 [2018-10-24 12:05:05,799 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:05:05,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2018-10-24 12:05:05,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 176. [2018-10-24 12:05:05,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-10-24 12:05:05,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 236 transitions. [2018-10-24 12:05:05,820 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 236 transitions. Word has length 75 [2018-10-24 12:05:05,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:05,820 INFO L481 AbstractCegarLoop]: Abstraction has 176 states and 236 transitions. [2018-10-24 12:05:05,820 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:05:05,820 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 236 transitions. [2018-10-24 12:05:05,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-24 12:05:05,823 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:05,823 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:05,823 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:05,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:05,824 INFO L82 PathProgramCache]: Analyzing trace with hash -2053819268, now seen corresponding path program 4 times [2018-10-24 12:05:05,824 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:05,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:05,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:05,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:05,825 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:05,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:05,958 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-24 12:05:05,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:05,959 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:05,959 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:05,959 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:05,959 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:05,959 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:05,972 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:05,973 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:06,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:06,024 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:06,056 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-24 12:05:06,056 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:06,177 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-24 12:05:06,200 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:06,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-24 12:05:06,201 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:06,201 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:05:06,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:05:06,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:05:06,202 INFO L87 Difference]: Start difference. First operand 176 states and 236 transitions. Second operand 9 states. [2018-10-24 12:05:06,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:06,479 INFO L93 Difference]: Finished difference Result 424 states and 587 transitions. [2018-10-24 12:05:06,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-24 12:05:06,481 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 85 [2018-10-24 12:05:06,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:06,484 INFO L225 Difference]: With dead ends: 424 [2018-10-24 12:05:06,484 INFO L226 Difference]: Without dead ends: 271 [2018-10-24 12:05:06,485 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:05:06,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2018-10-24 12:05:06,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 202. [2018-10-24 12:05:06,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-24 12:05:06,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 272 transitions. [2018-10-24 12:05:06,507 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 272 transitions. Word has length 85 [2018-10-24 12:05:06,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:06,507 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 272 transitions. [2018-10-24 12:05:06,507 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:05:06,507 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 272 transitions. [2018-10-24 12:05:06,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-24 12:05:06,510 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:06,511 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 6, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:06,511 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:06,511 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:06,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1431295078, now seen corresponding path program 5 times [2018-10-24 12:05:06,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:06,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:06,512 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:06,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:06,512 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:06,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:06,690 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2018-10-24 12:05:06,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:06,690 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:06,690 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:06,690 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:06,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:06,691 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:06,698 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:06,698 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:06,750 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:05:06,751 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:06,755 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:06,868 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 47 proven. 11 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-24 12:05:06,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:07,063 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 47 proven. 11 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-24 12:05:07,085 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:07,086 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 21 [2018-10-24 12:05:07,086 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:07,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:05:07,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:05:07,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:05:07,088 INFO L87 Difference]: Start difference. First operand 202 states and 272 transitions. Second operand 15 states. [2018-10-24 12:05:07,357 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 9 [2018-10-24 12:05:09,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:09,559 INFO L93 Difference]: Finished difference Result 935 states and 1327 transitions. [2018-10-24 12:05:09,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-24 12:05:09,560 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 95 [2018-10-24 12:05:09,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:09,569 INFO L225 Difference]: With dead ends: 935 [2018-10-24 12:05:09,569 INFO L226 Difference]: Without dead ends: 756 [2018-10-24 12:05:09,571 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 567 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=725, Invalid=1927, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:05:09,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 756 states. [2018-10-24 12:05:09,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 756 to 246. [2018-10-24 12:05:09,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2018-10-24 12:05:09,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 336 transitions. [2018-10-24 12:05:09,612 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 336 transitions. Word has length 95 [2018-10-24 12:05:09,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:09,613 INFO L481 AbstractCegarLoop]: Abstraction has 246 states and 336 transitions. [2018-10-24 12:05:09,613 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:05:09,613 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 336 transitions. [2018-10-24 12:05:09,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-24 12:05:09,617 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:09,618 INFO L375 BasicCegarLoop]: trace histogram [10, 8, 8, 7, 7, 7, 7, 7, 7, 7, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:09,618 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:09,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:09,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1239096169, now seen corresponding path program 6 times [2018-10-24 12:05:09,619 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:09,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:09,620 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:09,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:09,621 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:09,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:09,823 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-24 12:05:09,823 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:09,823 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:09,823 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:09,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:09,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:09,824 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:09,844 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:05:09,844 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:05:09,916 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:05:09,916 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:09,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:09,966 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-24 12:05:09,966 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:10,113 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-24 12:05:10,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:10,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-24 12:05:10,146 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:10,147 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:05:10,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:05:10,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:05:10,147 INFO L87 Difference]: Start difference. First operand 246 states and 336 transitions. Second operand 11 states. [2018-10-24 12:05:11,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:11,129 INFO L93 Difference]: Finished difference Result 594 states and 837 transitions. [2018-10-24 12:05:11,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:05:11,129 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 115 [2018-10-24 12:05:11,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:11,132 INFO L225 Difference]: With dead ends: 594 [2018-10-24 12:05:11,132 INFO L226 Difference]: Without dead ends: 377 [2018-10-24 12:05:11,133 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:05:11,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2018-10-24 12:05:11,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 272. [2018-10-24 12:05:11,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2018-10-24 12:05:11,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 372 transitions. [2018-10-24 12:05:11,164 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 372 transitions. Word has length 115 [2018-10-24 12:05:11,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:11,164 INFO L481 AbstractCegarLoop]: Abstraction has 272 states and 372 transitions. [2018-10-24 12:05:11,165 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:05:11,165 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 372 transitions. [2018-10-24 12:05:11,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-24 12:05:11,167 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:11,167 INFO L375 BasicCegarLoop]: trace histogram [11, 9, 9, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:11,167 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:11,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:11,167 INFO L82 PathProgramCache]: Analyzing trace with hash -2041958265, now seen corresponding path program 7 times [2018-10-24 12:05:11,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:11,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:11,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:11,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:11,169 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:11,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:11,433 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-24 12:05:11,433 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:11,434 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:11,434 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:11,434 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:11,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:11,434 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:11,442 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:11,443 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:11,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:11,527 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:11,561 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-24 12:05:11,561 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:11,949 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-24 12:05:11,971 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:11,971 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-24 12:05:11,971 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:11,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:05:11,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:05:11,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:05:11,973 INFO L87 Difference]: Start difference. First operand 272 states and 372 transitions. Second operand 12 states. [2018-10-24 12:05:12,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:12,436 INFO L93 Difference]: Finished difference Result 643 states and 906 transitions. [2018-10-24 12:05:12,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:05:12,437 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 125 [2018-10-24 12:05:12,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:12,443 INFO L225 Difference]: With dead ends: 643 [2018-10-24 12:05:12,443 INFO L226 Difference]: Without dead ends: 403 [2018-10-24 12:05:12,445 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:05:12,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2018-10-24 12:05:12,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 298. [2018-10-24 12:05:12,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-24 12:05:12,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 408 transitions. [2018-10-24 12:05:12,478 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 408 transitions. Word has length 125 [2018-10-24 12:05:12,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:12,478 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 408 transitions. [2018-10-24 12:05:12,478 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:05:12,478 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 408 transitions. [2018-10-24 12:05:12,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-24 12:05:12,480 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:12,481 INFO L375 BasicCegarLoop]: trace histogram [12, 10, 10, 9, 9, 9, 9, 9, 9, 9, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:12,481 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:12,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:12,481 INFO L82 PathProgramCache]: Analyzing trace with hash 1943870825, now seen corresponding path program 8 times [2018-10-24 12:05:12,481 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:12,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:12,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:12,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:12,483 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:12,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:13,687 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 354 trivial. 0 not checked. [2018-10-24 12:05:13,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:13,687 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:13,688 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:13,688 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:13,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:13,688 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:13,695 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:13,696 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:13,758 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-24 12:05:13,759 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:13,762 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:13,913 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 90 proven. 27 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2018-10-24 12:05:13,913 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:14,092 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 90 proven. 27 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2018-10-24 12:05:14,119 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:14,120 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 26 [2018-10-24 12:05:14,120 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:14,120 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:05:14,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:05:14,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:05:14,121 INFO L87 Difference]: Start difference. First operand 298 states and 408 transitions. Second operand 19 states. [2018-10-24 12:05:16,467 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-10-24 12:05:17,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:17,736 INFO L93 Difference]: Finished difference Result 1540 states and 2202 transitions. [2018-10-24 12:05:17,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-24 12:05:17,737 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 135 [2018-10-24 12:05:17,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:17,745 INFO L225 Difference]: With dead ends: 1540 [2018-10-24 12:05:17,745 INFO L226 Difference]: Without dead ends: 1274 [2018-10-24 12:05:17,749 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1667 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1773, Invalid=4547, Unknown=0, NotChecked=0, Total=6320 [2018-10-24 12:05:17,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1274 states. [2018-10-24 12:05:17,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1274 to 342. [2018-10-24 12:05:17,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 342 states. [2018-10-24 12:05:17,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 472 transitions. [2018-10-24 12:05:17,802 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 472 transitions. Word has length 135 [2018-10-24 12:05:17,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:17,803 INFO L481 AbstractCegarLoop]: Abstraction has 342 states and 472 transitions. [2018-10-24 12:05:17,803 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:05:17,803 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 472 transitions. [2018-10-24 12:05:17,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-24 12:05:17,806 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:17,806 INFO L375 BasicCegarLoop]: trace histogram [14, 11, 11, 10, 10, 10, 10, 10, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:17,806 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:17,806 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:17,806 INFO L82 PathProgramCache]: Analyzing trace with hash -168664780, now seen corresponding path program 9 times [2018-10-24 12:05:17,807 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:17,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:17,807 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:17,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:17,808 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:17,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:18,156 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-24 12:05:18,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:18,157 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:18,157 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:18,157 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:18,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:18,157 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:18,197 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:05:18,197 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:05:18,281 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:05:18,281 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:18,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:18,316 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-24 12:05:18,316 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:18,507 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-24 12:05:18,531 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:18,531 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-24 12:05:18,531 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:18,532 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:05:18,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:05:18,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:05:18,532 INFO L87 Difference]: Start difference. First operand 342 states and 472 transitions. Second operand 14 states. [2018-10-24 12:05:18,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:18,994 INFO L93 Difference]: Finished difference Result 813 states and 1156 transitions. [2018-10-24 12:05:18,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:05:18,995 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 155 [2018-10-24 12:05:18,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:18,998 INFO L225 Difference]: With dead ends: 813 [2018-10-24 12:05:18,998 INFO L226 Difference]: Without dead ends: 509 [2018-10-24 12:05:19,000 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 299 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:05:19,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2018-10-24 12:05:19,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 368. [2018-10-24 12:05:19,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2018-10-24 12:05:19,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 508 transitions. [2018-10-24 12:05:19,049 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 508 transitions. Word has length 155 [2018-10-24 12:05:19,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:19,049 INFO L481 AbstractCegarLoop]: Abstraction has 368 states and 508 transitions. [2018-10-24 12:05:19,049 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:05:19,049 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 508 transitions. [2018-10-24 12:05:19,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-24 12:05:19,052 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:19,052 INFO L375 BasicCegarLoop]: trace histogram [15, 12, 12, 11, 11, 11, 11, 11, 11, 11, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:19,052 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:19,053 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:19,053 INFO L82 PathProgramCache]: Analyzing trace with hash 1485660182, now seen corresponding path program 10 times [2018-10-24 12:05:19,053 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:19,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:19,054 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:19,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:19,054 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:19,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:19,685 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-24 12:05:19,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:19,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:19,686 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:19,686 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:19,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:19,686 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:19,693 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:19,693 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:19,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:19,784 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:19,820 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-24 12:05:19,821 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:20,089 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-24 12:05:20,110 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:20,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-24 12:05:20,111 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:20,111 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:05:20,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:05:20,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:05:20,112 INFO L87 Difference]: Start difference. First operand 368 states and 508 transitions. Second operand 15 states. [2018-10-24 12:05:20,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:20,893 INFO L93 Difference]: Finished difference Result 862 states and 1225 transitions. [2018-10-24 12:05:20,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:05:20,893 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 165 [2018-10-24 12:05:20,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:20,897 INFO L225 Difference]: With dead ends: 862 [2018-10-24 12:05:20,898 INFO L226 Difference]: Without dead ends: 535 [2018-10-24 12:05:20,899 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:05:20,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2018-10-24 12:05:20,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 394. [2018-10-24 12:05:20,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 394 states. [2018-10-24 12:05:20,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 544 transitions. [2018-10-24 12:05:20,954 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 544 transitions. Word has length 165 [2018-10-24 12:05:20,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:20,954 INFO L481 AbstractCegarLoop]: Abstraction has 394 states and 544 transitions. [2018-10-24 12:05:20,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:05:20,955 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 544 transitions. [2018-10-24 12:05:20,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-10-24 12:05:20,958 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:20,958 INFO L375 BasicCegarLoop]: trace histogram [16, 13, 13, 12, 12, 12, 12, 12, 12, 12, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:20,958 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:20,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:20,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1005051572, now seen corresponding path program 11 times [2018-10-24 12:05:20,959 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:20,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:20,960 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:20,960 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:20,960 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:20,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:21,620 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2018-10-24 12:05:21,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:21,620 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:21,621 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:21,621 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:21,621 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:21,621 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:21,628 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:21,629 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:21,702 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:05:21,702 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:21,706 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:21,907 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 145 proven. 50 refuted. 0 times theorem prover too weak. 669 trivial. 0 not checked. [2018-10-24 12:05:21,907 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:22,446 WARN L179 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-24 12:05:22,527 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 145 proven. 50 refuted. 0 times theorem prover too weak. 669 trivial. 0 not checked. [2018-10-24 12:05:22,549 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:22,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10, 10] total 31 [2018-10-24 12:05:22,550 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:22,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:05:22,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:05:22,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=743, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:05:22,552 INFO L87 Difference]: Start difference. First operand 394 states and 544 transitions. Second operand 23 states. [2018-10-24 12:05:25,198 WARN L179 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-24 12:05:29,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:29,220 INFO L93 Difference]: Finished difference Result 2277 states and 3269 transitions. [2018-10-24 12:05:29,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-10-24 12:05:29,221 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 175 [2018-10-24 12:05:29,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:29,229 INFO L225 Difference]: With dead ends: 2277 [2018-10-24 12:05:29,229 INFO L226 Difference]: Without dead ends: 1924 [2018-10-24 12:05:29,234 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3904 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3647, Invalid=9235, Unknown=0, NotChecked=0, Total=12882 [2018-10-24 12:05:29,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1924 states. [2018-10-24 12:05:29,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1924 to 438. [2018-10-24 12:05:29,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 438 states. [2018-10-24 12:05:29,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 608 transitions. [2018-10-24 12:05:29,324 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 608 transitions. Word has length 175 [2018-10-24 12:05:29,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:29,324 INFO L481 AbstractCegarLoop]: Abstraction has 438 states and 608 transitions. [2018-10-24 12:05:29,324 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:05:29,324 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 608 transitions. [2018-10-24 12:05:29,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-24 12:05:29,328 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:29,328 INFO L375 BasicCegarLoop]: trace histogram [18, 14, 14, 13, 13, 13, 13, 13, 13, 13, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:29,328 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:29,329 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:29,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1770266243, now seen corresponding path program 12 times [2018-10-24 12:05:29,329 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:29,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:29,330 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:29,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:29,330 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:29,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:30,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-24 12:05:30,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:30,035 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:30,035 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:30,035 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:30,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:30,036 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:30,045 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:05:30,045 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:05:30,155 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:05:30,155 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:30,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:30,195 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-24 12:05:30,195 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:30,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-24 12:05:30,552 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:30,552 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-24 12:05:30,552 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:30,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:05:30,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:05:30,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:05:30,554 INFO L87 Difference]: Start difference. First operand 438 states and 608 transitions. Second operand 17 states. [2018-10-24 12:05:31,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:31,394 INFO L93 Difference]: Finished difference Result 1032 states and 1475 transitions. [2018-10-24 12:05:31,395 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:05:31,395 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 195 [2018-10-24 12:05:31,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:31,400 INFO L225 Difference]: With dead ends: 1032 [2018-10-24 12:05:31,400 INFO L226 Difference]: Without dead ends: 641 [2018-10-24 12:05:31,402 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:05:31,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2018-10-24 12:05:31,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 464. [2018-10-24 12:05:31,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 464 states. [2018-10-24 12:05:31,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 644 transitions. [2018-10-24 12:05:31,488 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 644 transitions. Word has length 195 [2018-10-24 12:05:31,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:31,488 INFO L481 AbstractCegarLoop]: Abstraction has 464 states and 644 transitions. [2018-10-24 12:05:31,489 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:05:31,489 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 644 transitions. [2018-10-24 12:05:31,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-10-24 12:05:31,492 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:31,493 INFO L375 BasicCegarLoop]: trace histogram [19, 15, 15, 14, 14, 14, 14, 14, 14, 14, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:31,493 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:31,493 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:31,493 INFO L82 PathProgramCache]: Analyzing trace with hash -2012988639, now seen corresponding path program 13 times [2018-10-24 12:05:31,494 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:31,494 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:31,494 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:31,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:31,495 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:31,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:32,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-24 12:05:32,172 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:32,172 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:32,173 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:32,173 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:32,173 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:32,173 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:32,180 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:32,180 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:32,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:32,294 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:32,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-24 12:05:32,329 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:32,678 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-24 12:05:32,699 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:32,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-24 12:05:32,699 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:32,700 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:05:32,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:05:32,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:05:32,701 INFO L87 Difference]: Start difference. First operand 464 states and 644 transitions. Second operand 18 states. [2018-10-24 12:05:33,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:33,221 INFO L93 Difference]: Finished difference Result 1081 states and 1544 transitions. [2018-10-24 12:05:33,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:05:33,221 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 205 [2018-10-24 12:05:33,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:33,225 INFO L225 Difference]: With dead ends: 1081 [2018-10-24 12:05:33,225 INFO L226 Difference]: Without dead ends: 667 [2018-10-24 12:05:33,226 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 395 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:05:33,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2018-10-24 12:05:33,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 490. [2018-10-24 12:05:33,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2018-10-24 12:05:33,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 680 transitions. [2018-10-24 12:05:33,312 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 680 transitions. Word has length 205 [2018-10-24 12:05:33,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:33,312 INFO L481 AbstractCegarLoop]: Abstraction has 490 states and 680 transitions. [2018-10-24 12:05:33,313 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:05:33,313 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 680 transitions. [2018-10-24 12:05:33,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-24 12:05:33,315 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:33,316 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 16, 15, 15, 15, 15, 15, 15, 15, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:33,316 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:33,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:33,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1457442685, now seen corresponding path program 14 times [2018-10-24 12:05:33,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:33,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:33,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:33,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:33,317 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:33,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:34,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 1015 trivial. 0 not checked. [2018-10-24 12:05:34,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:34,843 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:34,843 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:34,843 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:34,843 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:34,843 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:34,855 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:34,855 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:35,027 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:05:35,027 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:35,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:35,232 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 212 proven. 80 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2018-10-24 12:05:35,232 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:35,632 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 212 proven. 80 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2018-10-24 12:05:35,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:35,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 11, 11] total 36 [2018-10-24 12:05:35,657 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:35,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:05:35,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:05:35,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1000, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:05:35,659 INFO L87 Difference]: Start difference. First operand 490 states and 680 transitions. Second operand 27 states. [2018-10-24 12:05:45,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:45,006 INFO L93 Difference]: Finished difference Result 3146 states and 4528 transitions. [2018-10-24 12:05:45,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2018-10-24 12:05:45,006 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 215 [2018-10-24 12:05:45,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:45,020 INFO L225 Difference]: With dead ends: 3146 [2018-10-24 12:05:45,020 INFO L226 Difference]: Without dead ends: 2706 [2018-10-24 12:05:45,030 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 667 GetRequests, 515 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8108 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=6680, Invalid=16882, Unknown=0, NotChecked=0, Total=23562 [2018-10-24 12:05:45,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2706 states. [2018-10-24 12:05:45,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2706 to 534. [2018-10-24 12:05:45,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 534 states. [2018-10-24 12:05:45,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 534 states to 534 states and 744 transitions. [2018-10-24 12:05:45,192 INFO L78 Accepts]: Start accepts. Automaton has 534 states and 744 transitions. Word has length 215 [2018-10-24 12:05:45,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:45,193 INFO L481 AbstractCegarLoop]: Abstraction has 534 states and 744 transitions. [2018-10-24 12:05:45,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:05:45,193 INFO L276 IsEmpty]: Start isEmpty. Operand 534 states and 744 transitions. [2018-10-24 12:05:45,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2018-10-24 12:05:45,197 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:45,197 INFO L375 BasicCegarLoop]: trace histogram [22, 17, 17, 16, 16, 16, 16, 16, 16, 16, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:45,198 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:45,198 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:45,198 INFO L82 PathProgramCache]: Analyzing trace with hash 202859342, now seen corresponding path program 15 times [2018-10-24 12:05:45,198 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:45,199 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:45,199 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:45,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:45,200 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:45,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:46,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-24 12:05:46,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:46,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:46,201 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:46,201 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:46,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:46,201 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:46,212 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:05:46,212 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:05:46,354 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:05:46,354 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:46,363 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:46,524 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-24 12:05:46,525 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:47,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-24 12:05:47,270 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:47,270 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-24 12:05:47,270 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:47,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:05:47,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:05:47,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:05:47,272 INFO L87 Difference]: Start difference. First operand 534 states and 744 transitions. Second operand 20 states. [2018-10-24 12:05:47,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:47,927 INFO L93 Difference]: Finished difference Result 1251 states and 1794 transitions. [2018-10-24 12:05:47,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:05:47,927 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 235 [2018-10-24 12:05:47,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:47,932 INFO L225 Difference]: With dead ends: 1251 [2018-10-24 12:05:47,932 INFO L226 Difference]: Without dead ends: 773 [2018-10-24 12:05:47,935 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 453 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:05:47,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 773 states. [2018-10-24 12:05:48,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 773 to 560. [2018-10-24 12:05:48,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 560 states. [2018-10-24 12:05:48,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 560 states to 560 states and 780 transitions. [2018-10-24 12:05:48,072 INFO L78 Accepts]: Start accepts. Automaton has 560 states and 780 transitions. Word has length 235 [2018-10-24 12:05:48,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:48,073 INFO L481 AbstractCegarLoop]: Abstraction has 560 states and 780 transitions. [2018-10-24 12:05:48,073 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:05:48,073 INFO L276 IsEmpty]: Start isEmpty. Operand 560 states and 780 transitions. [2018-10-24 12:05:48,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-10-24 12:05:48,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:48,076 INFO L375 BasicCegarLoop]: trace histogram [23, 18, 18, 17, 17, 17, 17, 17, 17, 17, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:48,077 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:48,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:48,077 INFO L82 PathProgramCache]: Analyzing trace with hash 249227952, now seen corresponding path program 16 times [2018-10-24 12:05:48,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:48,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:48,079 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:48,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:48,079 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:48,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:49,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-24 12:05:49,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:49,162 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:49,162 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:49,162 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:49,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:49,162 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:49,171 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:49,171 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:49,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:49,313 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:49,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-24 12:05:49,360 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:49,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-24 12:05:50,018 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:50,018 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-24 12:05:50,018 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:50,019 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:05:50,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:05:50,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:05:50,020 INFO L87 Difference]: Start difference. First operand 560 states and 780 transitions. Second operand 21 states. [2018-10-24 12:05:50,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:50,876 INFO L93 Difference]: Finished difference Result 1300 states and 1863 transitions. [2018-10-24 12:05:50,877 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:05:50,877 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 245 [2018-10-24 12:05:50,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:50,884 INFO L225 Difference]: With dead ends: 1300 [2018-10-24 12:05:50,884 INFO L226 Difference]: Without dead ends: 799 [2018-10-24 12:05:50,887 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 472 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:05:50,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2018-10-24 12:05:51,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 586. [2018-10-24 12:05:51,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 586 states. [2018-10-24 12:05:51,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 816 transitions. [2018-10-24 12:05:51,049 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 816 transitions. Word has length 245 [2018-10-24 12:05:51,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:51,049 INFO L481 AbstractCegarLoop]: Abstraction has 586 states and 816 transitions. [2018-10-24 12:05:51,049 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:05:51,050 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 816 transitions. [2018-10-24 12:05:51,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-24 12:05:51,053 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:51,053 INFO L375 BasicCegarLoop]: trace histogram [24, 19, 19, 18, 18, 18, 18, 18, 18, 18, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:51,053 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:51,054 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:51,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1964715826, now seen corresponding path program 17 times [2018-10-24 12:05:51,054 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:51,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:51,055 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:51,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:51,055 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:51,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:51,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 1473 trivial. 0 not checked. [2018-10-24 12:05:51,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:51,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:51,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:51,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:51,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:51,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:05:51,871 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:51,871 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:52,015 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-24 12:05:52,015 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:52,023 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:53,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 291 proven. 117 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2018-10-24 12:05:53,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:53,555 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 291 proven. 117 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2018-10-24 12:05:53,578 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:53,578 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 12, 12] total 41 [2018-10-24 12:05:53,578 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:53,579 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:05:53,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:05:53,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=1294, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:05:53,579 INFO L87 Difference]: Start difference. First operand 586 states and 816 transitions. Second operand 31 states. [2018-10-24 12:06:02,554 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-24 12:06:07,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:06:07,339 INFO L93 Difference]: Finished difference Result 4147 states and 5979 transitions. [2018-10-24 12:06:07,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 182 states. [2018-10-24 12:06:07,339 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 255 [2018-10-24 12:06:07,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:06:07,354 INFO L225 Difference]: With dead ends: 4147 [2018-10-24 12:06:07,354 INFO L226 Difference]: Without dead ends: 3620 [2018-10-24 12:06:07,359 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 829 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14642 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=11259, Invalid=28541, Unknown=0, NotChecked=0, Total=39800 [2018-10-24 12:06:07,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3620 states. [2018-10-24 12:06:07,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3620 to 630. [2018-10-24 12:06:07,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 630 states. [2018-10-24 12:06:07,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 630 states to 630 states and 880 transitions. [2018-10-24 12:06:07,574 INFO L78 Accepts]: Start accepts. Automaton has 630 states and 880 transitions. Word has length 255 [2018-10-24 12:06:07,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:06:07,574 INFO L481 AbstractCegarLoop]: Abstraction has 630 states and 880 transitions. [2018-10-24 12:06:07,574 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:06:07,574 INFO L276 IsEmpty]: Start isEmpty. Operand 630 states and 880 transitions. [2018-10-24 12:06:07,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-10-24 12:06:07,577 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:06:07,578 INFO L375 BasicCegarLoop]: trace histogram [26, 20, 20, 19, 19, 19, 19, 19, 19, 19, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:06:07,578 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:06:07,578 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:06:07,578 INFO L82 PathProgramCache]: Analyzing trace with hash -1157906275, now seen corresponding path program 18 times [2018-10-24 12:06:07,578 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:06:07,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:07,579 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:06:07,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:07,579 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:06:07,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:08,015 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-24 12:06:08,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:08,015 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:06:08,015 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:06:08,016 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:06:08,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:08,016 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:06:08,025 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:06:08,025 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:06:08,174 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:06:08,174 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:06:08,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:06:08,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-24 12:06:08,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:06:08,910 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-24 12:06:08,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:06:08,934 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-24 12:06:08,934 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:06:08,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:06:08,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:06:08,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:06:08,936 INFO L87 Difference]: Start difference. First operand 630 states and 880 transitions. Second operand 23 states. [2018-10-24 12:06:10,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:06:10,048 INFO L93 Difference]: Finished difference Result 1470 states and 2113 transitions. [2018-10-24 12:06:10,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:06:10,050 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 275 [2018-10-24 12:06:10,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:06:10,055 INFO L225 Difference]: With dead ends: 1470 [2018-10-24 12:06:10,055 INFO L226 Difference]: Without dead ends: 905 [2018-10-24 12:06:10,057 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 530 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:06:10,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 905 states. [2018-10-24 12:06:10,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 905 to 656. [2018-10-24 12:06:10,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 656 states. [2018-10-24 12:06:10,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 656 states to 656 states and 916 transitions. [2018-10-24 12:06:10,244 INFO L78 Accepts]: Start accepts. Automaton has 656 states and 916 transitions. Word has length 275 [2018-10-24 12:06:10,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:06:10,245 INFO L481 AbstractCegarLoop]: Abstraction has 656 states and 916 transitions. [2018-10-24 12:06:10,245 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:06:10,245 INFO L276 IsEmpty]: Start isEmpty. Operand 656 states and 916 transitions. [2018-10-24 12:06:10,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2018-10-24 12:06:10,249 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:06:10,249 INFO L375 BasicCegarLoop]: trace histogram [27, 21, 21, 20, 20, 20, 20, 20, 20, 20, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:06:10,249 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:06:10,249 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:06:10,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1671641925, now seen corresponding path program 19 times [2018-10-24 12:06:10,250 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:06:10,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:10,251 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:06:10,251 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:10,251 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:06:10,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:10,767 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:06:10,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:10,768 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:06:10,768 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:06:10,768 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:06:10,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:10,768 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:06:10,776 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:06:10,776 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:06:10,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:10,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:06:11,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:06:11,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:06:11,712 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:06:11,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:06:11,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-24 12:06:11,735 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:06:11,736 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:06:11,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:06:11,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:06:11,738 INFO L87 Difference]: Start difference. First operand 656 states and 916 transitions. Second operand 24 states. [2018-10-24 12:06:12,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:06:12,694 INFO L93 Difference]: Finished difference Result 1519 states and 2182 transitions. [2018-10-24 12:06:12,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:06:12,694 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 285 [2018-10-24 12:06:12,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:06:12,698 INFO L225 Difference]: With dead ends: 1519 [2018-10-24 12:06:12,698 INFO L226 Difference]: Without dead ends: 931 [2018-10-24 12:06:12,700 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 549 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:06:12,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2018-10-24 12:06:12,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 682. [2018-10-24 12:06:12,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 682 states. [2018-10-24 12:06:12,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 682 states to 682 states and 952 transitions. [2018-10-24 12:06:12,876 INFO L78 Accepts]: Start accepts. Automaton has 682 states and 952 transitions. Word has length 285 [2018-10-24 12:06:12,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:06:12,876 INFO L481 AbstractCegarLoop]: Abstraction has 682 states and 952 transitions. [2018-10-24 12:06:12,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:06:12,876 INFO L276 IsEmpty]: Start isEmpty. Operand 682 states and 952 transitions. [2018-10-24 12:06:12,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2018-10-24 12:06:12,880 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:06:12,881 INFO L375 BasicCegarLoop]: trace histogram [28, 22, 22, 21, 21, 21, 21, 21, 21, 21, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:06:12,881 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:06:12,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:06:12,881 INFO L82 PathProgramCache]: Analyzing trace with hash -1483218275, now seen corresponding path program 20 times [2018-10-24 12:06:12,881 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:06:12,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:12,882 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:06:12,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:12,883 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:06:12,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:13,370 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-10-24 12:06:13,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:13,370 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:06:13,371 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:06:13,371 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:06:13,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:13,371 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:06:13,380 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:06:13,381 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:06:13,575 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:06:13,575 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:06:13,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:06:13,937 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 382 proven. 161 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-24 12:06:13,938 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:06:14,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 382 proven. 161 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-24 12:06:14,443 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:06:14,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13] total 46 [2018-10-24 12:06:14,444 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:06:14,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:06:14,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:06:14,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=1625, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:06:14,446 INFO L87 Difference]: Start difference. First operand 682 states and 952 transitions. Second operand 35 states. [2018-10-24 12:06:19,891 WARN L179 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-24 12:06:33,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:06:33,852 INFO L93 Difference]: Finished difference Result 5280 states and 7622 transitions. [2018-10-24 12:06:33,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 232 states. [2018-10-24 12:06:33,853 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 295 [2018-10-24 12:06:33,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:06:33,870 INFO L225 Difference]: With dead ends: 5280 [2018-10-24 12:06:33,871 INFO L226 Difference]: Without dead ends: 4666 [2018-10-24 12:06:33,878 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1003 GetRequests, 738 SyntacticMatches, 15 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25982 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=17825, Invalid=45427, Unknown=0, NotChecked=0, Total=63252 [2018-10-24 12:06:33,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4666 states. [2018-10-24 12:06:34,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4666 to 726. [2018-10-24 12:06:34,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 726 states. [2018-10-24 12:06:34,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 726 states to 726 states and 1016 transitions. [2018-10-24 12:06:34,110 INFO L78 Accepts]: Start accepts. Automaton has 726 states and 1016 transitions. Word has length 295 [2018-10-24 12:06:34,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:06:34,111 INFO L481 AbstractCegarLoop]: Abstraction has 726 states and 1016 transitions. [2018-10-24 12:06:34,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:06:34,111 INFO L276 IsEmpty]: Start isEmpty. Operand 726 states and 1016 transitions. [2018-10-24 12:06:34,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-10-24 12:06:34,115 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:06:34,115 INFO L375 BasicCegarLoop]: trace histogram [30, 23, 23, 22, 22, 22, 22, 22, 22, 22, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:06:34,116 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:06:34,116 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:06:34,116 INFO L82 PathProgramCache]: Analyzing trace with hash 1730421864, now seen corresponding path program 21 times [2018-10-24 12:06:34,116 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:06:34,117 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:34,117 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:06:34,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:34,118 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:06:34,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:35,579 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-24 12:06:35,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:35,579 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:06:35,579 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:06:35,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:06:35,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:35,580 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:06:35,672 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:06:35,673 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:06:35,847 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:06:35,847 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:06:35,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:06:36,009 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-24 12:06:36,009 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:06:36,792 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-24 12:06:36,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:06:36,815 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-24 12:06:36,815 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:06:36,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:06:36,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:06:36,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:06:36,816 INFO L87 Difference]: Start difference. First operand 726 states and 1016 transitions. Second operand 26 states. [2018-10-24 12:06:37,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:06:37,812 INFO L93 Difference]: Finished difference Result 1689 states and 2432 transitions. [2018-10-24 12:06:37,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:06:37,812 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 315 [2018-10-24 12:06:37,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:06:37,819 INFO L225 Difference]: With dead ends: 1689 [2018-10-24 12:06:37,819 INFO L226 Difference]: Without dead ends: 1037 [2018-10-24 12:06:37,822 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 607 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:06:37,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1037 states. [2018-10-24 12:06:38,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1037 to 752. [2018-10-24 12:06:38,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 752 states. [2018-10-24 12:06:38,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 752 states to 752 states and 1052 transitions. [2018-10-24 12:06:38,035 INFO L78 Accepts]: Start accepts. Automaton has 752 states and 1052 transitions. Word has length 315 [2018-10-24 12:06:38,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:06:38,035 INFO L481 AbstractCegarLoop]: Abstraction has 752 states and 1052 transitions. [2018-10-24 12:06:38,035 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:06:38,036 INFO L276 IsEmpty]: Start isEmpty. Operand 752 states and 1052 transitions. [2018-10-24 12:06:38,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-10-24 12:06:38,039 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:06:38,040 INFO L375 BasicCegarLoop]: trace histogram [31, 24, 24, 23, 23, 23, 23, 23, 23, 23, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:06:38,040 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:06:38,040 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:06:38,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1371253686, now seen corresponding path program 22 times [2018-10-24 12:06:38,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:06:38,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:38,042 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:06:38,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:38,042 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:06:38,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:38,563 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-24 12:06:38,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:38,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:06:38,564 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:06:38,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:06:38,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:38,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:06:38,574 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:06:38,574 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:06:38,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:38,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:06:38,915 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-24 12:06:38,916 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:06:39,663 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-24 12:06:39,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:06:39,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-24 12:06:39,686 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:06:39,687 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:06:39,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:06:39,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:06:39,688 INFO L87 Difference]: Start difference. First operand 752 states and 1052 transitions. Second operand 27 states. [2018-10-24 12:06:40,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:06:40,955 INFO L93 Difference]: Finished difference Result 1738 states and 2501 transitions. [2018-10-24 12:06:40,955 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:06:40,955 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 325 [2018-10-24 12:06:40,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:06:40,961 INFO L225 Difference]: With dead ends: 1738 [2018-10-24 12:06:40,961 INFO L226 Difference]: Without dead ends: 1063 [2018-10-24 12:06:40,964 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 626 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:06:40,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1063 states. [2018-10-24 12:06:41,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1063 to 778. [2018-10-24 12:06:41,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 778 states. [2018-10-24 12:06:41,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 778 states to 778 states and 1088 transitions. [2018-10-24 12:06:41,290 INFO L78 Accepts]: Start accepts. Automaton has 778 states and 1088 transitions. Word has length 325 [2018-10-24 12:06:41,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:06:41,290 INFO L481 AbstractCegarLoop]: Abstraction has 778 states and 1088 transitions. [2018-10-24 12:06:41,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:06:41,290 INFO L276 IsEmpty]: Start isEmpty. Operand 778 states and 1088 transitions. [2018-10-24 12:06:41,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2018-10-24 12:06:41,295 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:06:41,295 INFO L375 BasicCegarLoop]: trace histogram [32, 25, 25, 24, 24, 24, 24, 24, 24, 24, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:06:41,295 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:06:41,296 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:06:41,296 INFO L82 PathProgramCache]: Analyzing trace with hash 686129640, now seen corresponding path program 23 times [2018-10-24 12:06:41,296 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:06:41,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:41,297 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:06:41,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:06:41,297 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:06:41,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:06:42,735 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 2644 trivial. 0 not checked. [2018-10-24 12:06:42,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:42,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:06:42,736 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:06:42,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:06:42,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:06:42,736 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:06:42,745 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:06:42,745 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:06:42,987 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:06:42,987 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:06:42,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:06:43,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 485 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-10-24 12:06:43,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:06:44,835 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-24 12:06:45,329 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 485 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-10-24 12:06:45,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:06:45,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14, 14] total 51 [2018-10-24 12:06:45,352 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:06:45,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:06:45,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:06:45,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=1993, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:06:45,354 INFO L87 Difference]: Start difference. First operand 778 states and 1088 transitions. Second operand 39 states. [2018-10-24 12:06:54,609 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-24 12:07:09,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:07:09,868 INFO L93 Difference]: Finished difference Result 6545 states and 9457 transitions. [2018-10-24 12:07:09,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 288 states. [2018-10-24 12:07:09,869 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 335 [2018-10-24 12:07:09,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:07:09,882 INFO L225 Difference]: With dead ends: 6545 [2018-10-24 12:07:09,883 INFO L226 Difference]: Without dead ends: 5844 [2018-10-24 12:07:09,890 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1189 GetRequests, 881 SyntacticMatches, 0 SemanticMatches, 308 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40665 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=26873, Invalid=68917, Unknown=0, NotChecked=0, Total=95790 [2018-10-24 12:07:09,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5844 states. [2018-10-24 12:07:10,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5844 to 822. [2018-10-24 12:07:10,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 822 states. [2018-10-24 12:07:10,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 822 states to 822 states and 1152 transitions. [2018-10-24 12:07:10,189 INFO L78 Accepts]: Start accepts. Automaton has 822 states and 1152 transitions. Word has length 335 [2018-10-24 12:07:10,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:07:10,190 INFO L481 AbstractCegarLoop]: Abstraction has 822 states and 1152 transitions. [2018-10-24 12:07:10,190 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:07:10,190 INFO L276 IsEmpty]: Start isEmpty. Operand 822 states and 1152 transitions. [2018-10-24 12:07:10,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2018-10-24 12:07:10,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:07:10,194 INFO L375 BasicCegarLoop]: trace histogram [34, 26, 26, 25, 25, 25, 25, 25, 25, 25, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:07:10,194 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:07:10,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:07:10,195 INFO L82 PathProgramCache]: Analyzing trace with hash 115900855, now seen corresponding path program 24 times [2018-10-24 12:07:10,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:07:10,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:10,196 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:07:10,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:10,196 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:07:10,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:07:10,931 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-24 12:07:10,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:10,932 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:07:10,932 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:07:10,932 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:07:10,932 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:10,933 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:07:10,945 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:07:10,946 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:07:11,130 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:07:11,131 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:07:11,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:07:11,216 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-24 12:07:11,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:07:12,185 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-24 12:07:12,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:07:12,207 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-24 12:07:12,207 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:07:12,208 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:07:12,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:07:12,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:07:12,209 INFO L87 Difference]: Start difference. First operand 822 states and 1152 transitions. Second operand 29 states. [2018-10-24 12:07:13,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:07:13,437 INFO L93 Difference]: Finished difference Result 1908 states and 2751 transitions. [2018-10-24 12:07:13,438 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:07:13,438 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 355 [2018-10-24 12:07:13,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:07:13,441 INFO L225 Difference]: With dead ends: 1908 [2018-10-24 12:07:13,441 INFO L226 Difference]: Without dead ends: 1169 [2018-10-24 12:07:13,444 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 684 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:07:13,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1169 states. [2018-10-24 12:07:13,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1169 to 848. [2018-10-24 12:07:13,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 848 states. [2018-10-24 12:07:13,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 848 states to 848 states and 1188 transitions. [2018-10-24 12:07:13,846 INFO L78 Accepts]: Start accepts. Automaton has 848 states and 1188 transitions. Word has length 355 [2018-10-24 12:07:13,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:07:13,847 INFO L481 AbstractCegarLoop]: Abstraction has 848 states and 1188 transitions. [2018-10-24 12:07:13,847 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:07:13,847 INFO L276 IsEmpty]: Start isEmpty. Operand 848 states and 1188 transitions. [2018-10-24 12:07:13,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2018-10-24 12:07:13,851 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:07:13,851 INFO L375 BasicCegarLoop]: trace histogram [35, 27, 27, 26, 26, 26, 26, 26, 26, 26, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:07:13,851 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:07:13,851 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:07:13,851 INFO L82 PathProgramCache]: Analyzing trace with hash 796020053, now seen corresponding path program 25 times [2018-10-24 12:07:13,852 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:07:13,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:13,852 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:07:13,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:13,853 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:07:13,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:07:14,611 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-24 12:07:14,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:14,612 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:07:14,612 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:07:14,612 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:07:14,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:14,612 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:07:14,621 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:07:14,622 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:07:14,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:07:14,815 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:07:14,899 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-24 12:07:14,900 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:07:15,894 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-24 12:07:15,915 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:07:15,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-24 12:07:15,916 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:07:15,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:07:15,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:07:15,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:07:15,917 INFO L87 Difference]: Start difference. First operand 848 states and 1188 transitions. Second operand 30 states. [2018-10-24 12:07:17,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:07:17,137 INFO L93 Difference]: Finished difference Result 1957 states and 2820 transitions. [2018-10-24 12:07:17,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:07:17,138 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 365 [2018-10-24 12:07:17,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:07:17,143 INFO L225 Difference]: With dead ends: 1957 [2018-10-24 12:07:17,143 INFO L226 Difference]: Without dead ends: 1195 [2018-10-24 12:07:17,145 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 758 GetRequests, 703 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:07:17,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1195 states. [2018-10-24 12:07:17,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1195 to 874. [2018-10-24 12:07:17,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 874 states. [2018-10-24 12:07:17,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 874 states to 874 states and 1224 transitions. [2018-10-24 12:07:17,589 INFO L78 Accepts]: Start accepts. Automaton has 874 states and 1224 transitions. Word has length 365 [2018-10-24 12:07:17,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:07:17,589 INFO L481 AbstractCegarLoop]: Abstraction has 874 states and 1224 transitions. [2018-10-24 12:07:17,589 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:07:17,589 INFO L276 IsEmpty]: Start isEmpty. Operand 874 states and 1224 transitions. [2018-10-24 12:07:17,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2018-10-24 12:07:17,594 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:07:17,594 INFO L375 BasicCegarLoop]: trace histogram [36, 28, 28, 27, 27, 27, 27, 27, 27, 27, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:07:17,594 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:07:17,594 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:07:17,595 INFO L82 PathProgramCache]: Analyzing trace with hash -521686089, now seen corresponding path program 26 times [2018-10-24 12:07:17,595 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:07:17,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:17,596 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:07:17,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:17,598 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:07:17,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:07:18,226 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 3357 trivial. 0 not checked. [2018-10-24 12:07:18,226 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:18,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:07:18,227 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:07:18,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:07:18,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:18,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:07:18,235 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:07:18,235 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:07:18,593 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-24 12:07:18,594 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:07:18,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:07:19,299 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 600 proven. 270 refuted. 0 times theorem prover too weak. 3594 trivial. 0 not checked. [2018-10-24 12:07:19,300 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:07:20,010 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 600 proven. 270 refuted. 0 times theorem prover too weak. 3594 trivial. 0 not checked. [2018-10-24 12:07:20,033 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:07:20,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 15, 15] total 56 [2018-10-24 12:07:20,034 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:07:20,034 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:07:20,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:07:20,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=682, Invalid=2398, Unknown=0, NotChecked=0, Total=3080 [2018-10-24 12:07:20,035 INFO L87 Difference]: Start difference. First operand 874 states and 1224 transitions. Second operand 43 states. [2018-10-24 12:07:53,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:07:53,589 INFO L93 Difference]: Finished difference Result 7942 states and 11484 transitions. [2018-10-24 12:07:53,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 350 states. [2018-10-24 12:07:53,589 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 375 [2018-10-24 12:07:53,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:07:53,606 INFO L225 Difference]: With dead ends: 7942 [2018-10-24 12:07:53,606 INFO L226 Difference]: Without dead ends: 7154 [2018-10-24 12:07:53,623 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1387 GetRequests, 1015 SyntacticMatches, 0 SemanticMatches, 372 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62504 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=38952, Invalid=100550, Unknown=0, NotChecked=0, Total=139502 [2018-10-24 12:07:53,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7154 states. [2018-10-24 12:07:54,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7154 to 918. [2018-10-24 12:07:54,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 918 states. [2018-10-24 12:07:54,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 918 states to 918 states and 1288 transitions. [2018-10-24 12:07:54,247 INFO L78 Accepts]: Start accepts. Automaton has 918 states and 1288 transitions. Word has length 375 [2018-10-24 12:07:54,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:07:54,247 INFO L481 AbstractCegarLoop]: Abstraction has 918 states and 1288 transitions. [2018-10-24 12:07:54,247 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:07:54,247 INFO L276 IsEmpty]: Start isEmpty. Operand 918 states and 1288 transitions. [2018-10-24 12:07:54,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2018-10-24 12:07:54,251 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:07:54,251 INFO L375 BasicCegarLoop]: trace histogram [38, 29, 29, 28, 28, 28, 28, 28, 28, 28, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:07:54,251 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:07:54,251 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:07:54,251 INFO L82 PathProgramCache]: Analyzing trace with hash 907486338, now seen corresponding path program 27 times [2018-10-24 12:07:54,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:07:54,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:54,252 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:07:54,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:54,253 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:07:54,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:07:55,849 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-24 12:07:55,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:55,850 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:07:55,850 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:07:55,850 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:07:55,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:55,850 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:07:55,859 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:07:55,859 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:07:56,071 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:07:56,072 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:07:56,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:07:56,160 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-24 12:07:56,160 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:07:57,242 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-24 12:07:57,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:07:57,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-24 12:07:57,266 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:07:57,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:07:57,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:07:57,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:07:57,268 INFO L87 Difference]: Start difference. First operand 918 states and 1288 transitions. Second operand 32 states. [2018-10-24 12:07:58,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:07:58,602 INFO L93 Difference]: Finished difference Result 2127 states and 3070 transitions. [2018-10-24 12:07:58,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:07:58,603 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 395 [2018-10-24 12:07:58,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:07:58,607 INFO L225 Difference]: With dead ends: 2127 [2018-10-24 12:07:58,607 INFO L226 Difference]: Without dead ends: 1301 [2018-10-24 12:07:58,609 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 761 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:07:58,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1301 states. [2018-10-24 12:07:59,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1301 to 944. [2018-10-24 12:07:59,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 944 states. [2018-10-24 12:07:59,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 944 states to 944 states and 1324 transitions. [2018-10-24 12:07:59,019 INFO L78 Accepts]: Start accepts. Automaton has 944 states and 1324 transitions. Word has length 395 [2018-10-24 12:07:59,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:07:59,019 INFO L481 AbstractCegarLoop]: Abstraction has 944 states and 1324 transitions. [2018-10-24 12:07:59,019 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:07:59,019 INFO L276 IsEmpty]: Start isEmpty. Operand 944 states and 1324 transitions. [2018-10-24 12:07:59,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2018-10-24 12:07:59,022 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:07:59,022 INFO L375 BasicCegarLoop]: trace histogram [39, 30, 30, 29, 29, 29, 29, 29, 29, 29, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:07:59,022 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:07:59,022 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:07:59,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1397759204, now seen corresponding path program 28 times [2018-10-24 12:07:59,023 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:07:59,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:59,023 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:07:59,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:07:59,023 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:07:59,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:07:59,756 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-24 12:07:59,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:59,757 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:07:59,757 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:07:59,757 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:07:59,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:07:59,757 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:07:59,767 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:07:59,767 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:07:59,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:07:59,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:08:00,110 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-24 12:08:00,110 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:08:02,125 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-24 12:08:02,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:08:02,147 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-24 12:08:02,147 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:08:02,147 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:08:02,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:08:02,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:08:02,149 INFO L87 Difference]: Start difference. First operand 944 states and 1324 transitions. Second operand 33 states. [2018-10-24 12:08:03,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:08:03,556 INFO L93 Difference]: Finished difference Result 2176 states and 3139 transitions. [2018-10-24 12:08:03,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:08:03,556 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 405 [2018-10-24 12:08:03,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:08:03,560 INFO L225 Difference]: With dead ends: 2176 [2018-10-24 12:08:03,561 INFO L226 Difference]: Without dead ends: 1327 [2018-10-24 12:08:03,563 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 780 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:08:03,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1327 states. [2018-10-24 12:08:04,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1327 to 970. [2018-10-24 12:08:04,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 970 states. [2018-10-24 12:08:04,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 970 states to 970 states and 1360 transitions. [2018-10-24 12:08:04,032 INFO L78 Accepts]: Start accepts. Automaton has 970 states and 1360 transitions. Word has length 405 [2018-10-24 12:08:04,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:08:04,032 INFO L481 AbstractCegarLoop]: Abstraction has 970 states and 1360 transitions. [2018-10-24 12:08:04,032 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:08:04,032 INFO L276 IsEmpty]: Start isEmpty. Operand 970 states and 1360 transitions. [2018-10-24 12:08:04,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 416 [2018-10-24 12:08:04,036 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:08:04,036 INFO L375 BasicCegarLoop]: trace histogram [40, 31, 31, 30, 30, 30, 30, 30, 30, 30, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:08:04,037 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:08:04,037 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:08:04,037 INFO L82 PathProgramCache]: Analyzing trace with hash 2078831106, now seen corresponding path program 29 times [2018-10-24 12:08:04,037 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:08:04,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:08:04,038 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:08:04,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:08:04,038 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:08:04,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:08:04,655 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 4155 trivial. 0 not checked. [2018-10-24 12:08:04,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:08:04,655 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:08:04,656 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:08:04,656 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:08:04,656 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:08:04,656 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:08:04,665 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:08:04,665 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:08:04,980 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:08:04,980 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:08:04,986 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:08:05,386 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 727 proven. 335 refuted. 0 times theorem prover too weak. 4458 trivial. 0 not checked. [2018-10-24 12:08:05,386 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:08:06,145 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 727 proven. 335 refuted. 0 times theorem prover too weak. 4458 trivial. 0 not checked. [2018-10-24 12:08:06,168 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:08:06,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16, 16] total 61 [2018-10-24 12:08:06,169 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:08:06,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:08:06,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:08:06,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=2840, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:08:06,170 INFO L87 Difference]: Start difference. First operand 970 states and 1360 transitions. Second operand 47 states. [2018-10-24 12:08:36,819 WARN L179 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 Received shutdown request... [2018-10-24 12:08:42,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 385 states. [2018-10-24 12:08:42,852 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:08:42,858 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:08:42,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:08:42 BoogieIcfgContainer [2018-10-24 12:08:42,858 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:08:42,859 INFO L168 Benchmark]: Toolchain (without parser) took 230442.85 ms. Allocated memory was 1.5 GB in the beginning and 4.0 GB in the end (delta: 2.5 GB). Free memory was 1.4 GB in the beginning and 3.2 GB in the end (delta: -1.8 GB). Peak memory consumption was 735.3 MB. Max. memory is 7.1 GB. [2018-10-24 12:08:42,859 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:08:42,860 INFO L168 Benchmark]: CACSL2BoogieTranslator took 373.39 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:08:42,860 INFO L168 Benchmark]: Boogie Procedure Inliner took 56.26 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:08:42,861 INFO L168 Benchmark]: Boogie Preprocessor took 47.49 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:08:42,861 INFO L168 Benchmark]: RCFGBuilder took 775.26 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 2.1 GB in the end (delta: -762.9 MB). Peak memory consumption was 16.1 MB. Max. memory is 7.1 GB. [2018-10-24 12:08:42,862 INFO L168 Benchmark]: TraceAbstraction took 229185.30 ms. Allocated memory was 2.2 GB in the beginning and 4.0 GB in the end (delta: 1.8 GB). Free memory was 2.1 GB in the beginning and 3.2 GB in the end (delta: -1.1 GB). Peak memory consumption was 756.2 MB. Max. memory is 7.1 GB. [2018-10-24 12:08:42,865 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 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 373.39 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 56.26 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 47.49 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. * RCFGBuilder took 775.26 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 2.1 GB in the end (delta: -762.9 MB). Peak memory consumption was 16.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 229185.30 ms. Allocated memory was 2.2 GB in the beginning and 4.0 GB in the end (delta: 1.8 GB). Free memory was 2.1 GB in the beginning and 3.2 GB in the end (delta: -1.1 GB). Peak memory consumption was 756.2 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 constructing difference of abstraction (970states) and FLOYD_HOARE automaton (currently 385 states, 47 states before enhancement),while ReachableStatesComputation was computing reachable states (7224 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 55 locations, 1 error locations. TIMEOUT Result, 229.1s OverallTime, 33 OverallIterations, 40 TraceHistogramMax, 168.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 7120 SDtfs, 77771 SDslu, 40811 SDs, 0 SdLazy, 48944 SolverSat, 25749 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 52.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 17097 GetRequests, 14453 SyntacticMatches, 15 SemanticMatches, 2629 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235998 ImplicationChecksByTransitivity, 104.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=970occurred in iteration=32, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 5.8s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 5.1s AutomataMinimizationTime, 32 MinimizatonAttempts, 27461 StatesRemovedByMinimization, 31 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.9s SsaConstructionTime, 4.3s SatisfiabilityAnalysisTime, 42.1s InterpolantComputationTime, 13578 NumberOfCodeBlocks, 12568 NumberOfCodeBlocksAsserted, 139 NumberOfCheckSat, 20258 ConstructedInterpolants, 0 QuantifiedInterpolants, 10760600 SizeOfPredicates, 62 NumberOfNonLiveVariables, 22502 ConjunctsInSsa, 493 ConjunctsInUnsatCore, 95 InterpolantComputations, 4 PerfectInterpolantSequences, 139906/175128 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown