java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:16:13,755 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:16:13,758 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:16:13,770 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:16:13,771 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:16:13,772 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:16:13,773 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:16:13,775 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:16:13,777 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:16:13,778 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:16:13,779 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:16:13,779 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:16:13,780 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:16:13,781 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:16:13,782 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:16:13,783 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:16:13,784 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:16:13,785 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:16:13,787 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:16:13,789 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:16:13,790 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:16:13,791 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:16:13,794 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 09:16:13,794 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 09:16:13,795 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 09:16:13,796 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 09:16:13,797 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 09:16:13,797 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 09:16:13,798 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 09:16:13,799 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 09:16:13,800 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 09:16:13,801 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 09:16:13,801 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 09:16:13,801 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 09:16:13,802 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 09:16:13,803 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 09:16:13,803 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-27 09:16:13,830 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:16:13,831 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:16:13,831 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:16:13,832 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:16:13,832 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:16:13,832 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:16:13,832 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:16:13,832 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:16:13,833 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:16:13,833 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:16:13,833 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:16:13,833 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:16:13,833 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:16:13,834 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:16:13,835 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:16:13,835 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:16:13,835 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:16:13,835 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:16:13,835 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:16:13,836 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:16:13,837 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:16:13,837 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:16:13,837 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:16:13,837 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:16:13,837 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:16:13,838 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:16:13,838 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:16:13,838 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:16:13,838 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:16:13,838 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:16:13,839 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:16:13,839 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:16:13,839 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:16:13,840 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:16:13,840 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:16:13,840 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:16:13,888 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:16:13,906 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:16:13,911 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:16:13,913 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:16:13,913 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:16:13,914 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i [2018-10-27 09:16:13,985 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ffe1e0b6e/6cd3a609868a4cc7a02fc8581e8e7487/FLAG6464915fd [2018-10-27 09:16:14,436 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:16:14,437 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i [2018-10-27 09:16:14,443 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ffe1e0b6e/6cd3a609868a4cc7a02fc8581e8e7487/FLAG6464915fd [2018-10-27 09:16:14,460 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/ffe1e0b6e/6cd3a609868a4cc7a02fc8581e8e7487 [2018-10-27 09:16:14,471 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:16:14,472 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:16:14,473 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:16:14,474 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:16:14,477 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:16:14,478 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,481 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43be0e81 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14, skipping insertion in model container [2018-10-27 09:16:14,482 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,492 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:16:14,514 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:16:14,693 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:16:14,697 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:16:14,714 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:16:14,732 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:16:14,733 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14 WrapperNode [2018-10-27 09:16:14,733 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:16:14,734 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:16:14,734 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:16:14,735 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:16:14,744 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,751 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,758 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:16:14,758 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:16:14,758 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:16:14,758 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:16:14,768 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,769 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,769 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,770 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,774 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,782 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,784 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (1/1) ... [2018-10-27 09:16:14,785 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:16:14,786 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:16:14,787 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:16:14,787 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:16:14,788 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:16:14,865 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:16:14,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:16:14,865 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:16:14,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:16:14,866 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:16:14,866 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:16:14,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:16:14,866 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:16:15,159 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:16:15,160 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:16:15 BoogieIcfgContainer [2018-10-27 09:16:15,160 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:16:15,161 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:16:15,161 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:16:15,173 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:16:15,173 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:16:14" (1/3) ... [2018-10-27 09:16:15,174 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@adac15c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:16:15, skipping insertion in model container [2018-10-27 09:16:15,174 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:16:14" (2/3) ... [2018-10-27 09:16:15,178 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@adac15c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:16:15, skipping insertion in model container [2018-10-27 09:16:15,178 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:16:15" (3/3) ... [2018-10-27 09:16:15,184 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_nondet_true-unreach-call_true-termination.i [2018-10-27 09:16:15,215 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:16:15,230 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:16:15,248 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:16:15,289 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:16:15,290 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:16:15,290 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:16:15,290 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:16:15,290 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:16:15,291 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:16:15,291 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:16:15,291 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:16:15,309 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-27 09:16:15,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 09:16:15,316 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:15,317 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:15,319 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:15,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:15,331 INFO L82 PathProgramCache]: Analyzing trace with hash -722424895, now seen corresponding path program 1 times [2018-10-27 09:16:15,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:15,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:15,383 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:15,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:15,384 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:15,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:15,438 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:15,440 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:16:15,440 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:16:15,441 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:16:15,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:16:15,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:16:15,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:16:15,459 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-27 09:16:15,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:15,482 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2018-10-27 09:16:15,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:16:15,484 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 09:16:15,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:15,493 INFO L225 Difference]: With dead ends: 32 [2018-10-27 09:16:15,494 INFO L226 Difference]: Without dead ends: 13 [2018-10-27 09:16:15,498 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:16:15,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-27 09:16:15,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-27 09:16:15,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-27 09:16:15,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-27 09:16:15,536 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-27 09:16:15,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:15,537 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-27 09:16:15,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:16:15,537 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-27 09:16:15,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 09:16:15,538 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:15,538 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:15,539 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:15,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:15,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1289299715, now seen corresponding path program 1 times [2018-10-27 09:16:15,540 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:15,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:15,541 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:15,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:15,541 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:15,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:15,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:15,600 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:16:15,600 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 09:16:15,600 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:16:15,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 09:16:15,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 09:16:15,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:16:15,603 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-10-27 09:16:15,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:15,653 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 09:16:15,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 09:16:15,654 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 09:16:15,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:15,655 INFO L225 Difference]: With dead ends: 21 [2018-10-27 09:16:15,655 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 09:16:15,656 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:16:15,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 09:16:15,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-27 09:16:15,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-27 09:16:15,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-27 09:16:15,661 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-10-27 09:16:15,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:15,661 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-27 09:16:15,662 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 09:16:15,662 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-27 09:16:15,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 09:16:15,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:15,663 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:15,663 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:15,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:15,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1003978365, now seen corresponding path program 1 times [2018-10-27 09:16:15,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:15,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:15,665 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:15,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:15,665 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:15,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:15,763 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:15,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:15,764 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:15,765 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-27 09:16:15,767 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [25], [28], [30], [36], [37], [38], [40] [2018-10-27 09:16:15,801 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:16:15,801 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:16:15,962 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:16:15,964 INFO L272 AbstractInterpreter]: Visited 13 different actions 25 times. Merged at 4 different actions 7 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 5 variables. [2018-10-27 09:16:16,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:16,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:16:16,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:16,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:16,027 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:16,028 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:16,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:16,080 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:16,121 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:16,122 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:16,195 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:16,217 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:16,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2018-10-27 09:16:16,217 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:16,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 09:16:16,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 09:16:16,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-27 09:16:16,218 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-10-27 09:16:16,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:16,291 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-27 09:16:16,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 09:16:16,292 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-27 09:16:16,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:16,293 INFO L225 Difference]: With dead ends: 23 [2018-10-27 09:16:16,293 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 09:16:16,294 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-27 09:16:16,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 09:16:16,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 09:16:16,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 09:16:16,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-27 09:16:16,299 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-10-27 09:16:16,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:16,299 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-27 09:16:16,299 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 09:16:16,299 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-27 09:16:16,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 09:16:16,300 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:16,300 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:16,301 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:16,301 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:16,301 INFO L82 PathProgramCache]: Analyzing trace with hash 6482173, now seen corresponding path program 2 times [2018-10-27 09:16:16,301 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:16,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:16,303 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:16,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:16,303 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:16,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:16,469 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:16,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:16,470 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:16,470 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:16,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:16,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:16,470 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:16,479 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:16,479 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:16,512 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 09:16:16,512 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:16,515 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:16,571 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:16,571 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:16,936 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:16,957 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:16,957 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 09:16:16,958 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:16,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 09:16:16,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 09:16:16,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:16:16,959 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 7 states. [2018-10-27 09:16:17,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:17,031 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 09:16:17,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 09:16:17,032 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2018-10-27 09:16:17,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:17,033 INFO L225 Difference]: With dead ends: 27 [2018-10-27 09:16:17,033 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 09:16:17,034 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-10-27 09:16:17,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 09:16:17,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-27 09:16:17,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-27 09:16:17,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-27 09:16:17,039 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-10-27 09:16:17,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:17,039 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-27 09:16:17,039 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 09:16:17,039 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-27 09:16:17,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-27 09:16:17,040 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:17,040 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:17,041 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:17,041 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:17,041 INFO L82 PathProgramCache]: Analyzing trace with hash 476147325, now seen corresponding path program 3 times [2018-10-27 09:16:17,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:17,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:17,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:17,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:17,044 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:17,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:17,252 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:17,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:17,253 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:17,253 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:17,253 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:17,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:17,253 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:17,262 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:17,262 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:17,282 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:17,282 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:17,284 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:17,306 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:17,306 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:17,568 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:17,593 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:17,594 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 09:16:17,594 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:17,595 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 09:16:17,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 09:16:17,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-10-27 09:16:17,596 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2018-10-27 09:16:17,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:17,847 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-27 09:16:17,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 09:16:17,847 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-10-27 09:16:17,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:17,848 INFO L225 Difference]: With dead ends: 30 [2018-10-27 09:16:17,848 INFO L226 Difference]: Without dead ends: 25 [2018-10-27 09:16:17,849 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2018-10-27 09:16:17,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-27 09:16:17,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-27 09:16:17,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 09:16:17,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-27 09:16:17,854 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-27 09:16:17,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:17,855 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-27 09:16:17,855 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 09:16:17,855 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-27 09:16:17,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 09:16:17,856 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:17,856 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:17,856 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:17,857 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:17,857 INFO L82 PathProgramCache]: Analyzing trace with hash -732759811, now seen corresponding path program 4 times [2018-10-27 09:16:17,857 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:17,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:17,858 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:17,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:17,859 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:17,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:18,063 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:18,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:18,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:18,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:18,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:18,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:18,064 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:18,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:18,079 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:18,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:18,096 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:18,128 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:18,129 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:18,279 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:18,302 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:18,302 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 09:16:18,302 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:18,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:16:18,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:16:18,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:16:18,303 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-27 09:16:18,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:18,360 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 09:16:18,364 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 09:16:18,364 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-27 09:16:18,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:18,365 INFO L225 Difference]: With dead ends: 33 [2018-10-27 09:16:18,365 INFO L226 Difference]: Without dead ends: 28 [2018-10-27 09:16:18,366 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2018-10-27 09:16:18,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-27 09:16:18,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-27 09:16:18,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-27 09:16:18,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-27 09:16:18,372 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-27 09:16:18,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:18,372 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-27 09:16:18,372 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:16:18,373 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-27 09:16:18,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-27 09:16:18,373 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:18,374 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:18,374 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:18,374 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:18,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1984471427, now seen corresponding path program 5 times [2018-10-27 09:16:18,374 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:18,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:18,375 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:18,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:18,376 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:18,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:18,558 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:18,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:18,559 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:18,559 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:18,559 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:18,559 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:18,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:18,570 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:18,570 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:18,664 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 09:16:18,664 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:18,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:18,786 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:18,786 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:19,056 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:19,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:19,086 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 09:16:19,086 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:19,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 09:16:19,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 09:16:19,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2018-10-27 09:16:19,088 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 10 states. [2018-10-27 09:16:19,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:19,192 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-27 09:16:19,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 09:16:19,192 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-27 09:16:19,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:19,194 INFO L225 Difference]: With dead ends: 36 [2018-10-27 09:16:19,194 INFO L226 Difference]: Without dead ends: 31 [2018-10-27 09:16:19,195 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2018-10-27 09:16:19,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-27 09:16:19,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-27 09:16:19,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 09:16:19,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-27 09:16:19,201 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-27 09:16:19,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:19,201 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-27 09:16:19,201 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 09:16:19,201 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-27 09:16:19,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 09:16:19,202 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:19,202 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:19,203 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:19,203 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:19,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1475807485, now seen corresponding path program 6 times [2018-10-27 09:16:19,203 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:19,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:19,204 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:19,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:19,205 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:19,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:19,357 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:19,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:19,358 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:19,358 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:19,358 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:19,359 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:19,359 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:19,367 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:19,367 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:19,406 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:19,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:19,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:19,432 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:19,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:19,628 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:19,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:19,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 09:16:19,651 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:19,652 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 09:16:19,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 09:16:19,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=250, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:16:19,653 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 11 states. [2018-10-27 09:16:19,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:19,738 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 09:16:19,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:16:19,738 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2018-10-27 09:16:19,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:19,739 INFO L225 Difference]: With dead ends: 39 [2018-10-27 09:16:19,739 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 09:16:19,740 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2018-10-27 09:16:19,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 09:16:19,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-27 09:16:19,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-27 09:16:19,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-27 09:16:19,746 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-27 09:16:19,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:19,746 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-27 09:16:19,746 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 09:16:19,746 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-27 09:16:19,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-27 09:16:19,747 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:19,748 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:19,748 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:19,748 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:19,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1160163715, now seen corresponding path program 7 times [2018-10-27 09:16:19,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:19,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:19,749 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:19,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:19,749 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:19,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:19,913 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:19,913 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:19,914 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:19,914 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:19,914 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:19,914 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:19,914 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:19,924 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:19,925 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:19,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:19,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:19,987 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:19,987 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:20,195 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:20,217 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:20,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 09:16:20,217 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:20,218 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 09:16:20,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 09:16:20,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=299, Unknown=0, NotChecked=0, Total=462 [2018-10-27 09:16:20,219 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 12 states. [2018-10-27 09:16:20,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:20,382 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-27 09:16:20,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 09:16:20,382 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2018-10-27 09:16:20,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:20,383 INFO L225 Difference]: With dead ends: 42 [2018-10-27 09:16:20,383 INFO L226 Difference]: Without dead ends: 37 [2018-10-27 09:16:20,384 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=169, Invalid=337, Unknown=0, NotChecked=0, Total=506 [2018-10-27 09:16:20,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-27 09:16:20,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-27 09:16:20,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 09:16:20,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-27 09:16:20,389 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-27 09:16:20,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:20,389 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-27 09:16:20,390 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 09:16:20,390 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-27 09:16:20,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 09:16:20,391 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:20,391 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:20,391 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:20,391 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:20,392 INFO L82 PathProgramCache]: Analyzing trace with hash -196142851, now seen corresponding path program 8 times [2018-10-27 09:16:20,392 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:20,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:20,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:20,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:20,393 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:20,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:20,543 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:20,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:20,544 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:20,544 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:20,544 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:20,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:20,545 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:20,555 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:20,556 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:20,581 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 09:16:20,581 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:20,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:20,627 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:20,627 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:20,890 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:20,911 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:20,911 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 09:16:20,911 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:20,912 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:16:20,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:16:20,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:16:20,913 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 13 states. [2018-10-27 09:16:20,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:20,979 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 09:16:20,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:16:20,979 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2018-10-27 09:16:20,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:20,981 INFO L225 Difference]: With dead ends: 45 [2018-10-27 09:16:20,981 INFO L226 Difference]: Without dead ends: 40 [2018-10-27 09:16:20,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=206, Invalid=394, Unknown=0, NotChecked=0, Total=600 [2018-10-27 09:16:20,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-27 09:16:20,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-27 09:16:20,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-27 09:16:20,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-27 09:16:20,988 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-27 09:16:20,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:20,988 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-27 09:16:20,988 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:16:20,988 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-27 09:16:20,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-27 09:16:20,989 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:20,990 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:20,990 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:20,990 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:20,990 INFO L82 PathProgramCache]: Analyzing trace with hash -1496891779, now seen corresponding path program 9 times [2018-10-27 09:16:20,990 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:20,991 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:20,992 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:20,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:20,992 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:21,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:21,343 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:21,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:21,343 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:21,344 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:21,344 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:21,344 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:21,344 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:21,351 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:21,352 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:21,386 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:21,386 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:21,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:21,412 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:21,412 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:21,879 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:21,899 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:21,900 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 09:16:21,900 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:21,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 09:16:21,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 09:16:21,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:16:21,901 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 14 states. [2018-10-27 09:16:21,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:21,986 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-27 09:16:21,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:16:21,986 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2018-10-27 09:16:21,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:21,988 INFO L225 Difference]: With dead ends: 48 [2018-10-27 09:16:21,988 INFO L226 Difference]: Without dead ends: 43 [2018-10-27 09:16:21,989 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-27 09:16:21,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-27 09:16:21,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-27 09:16:21,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 09:16:21,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-27 09:16:21,994 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-27 09:16:21,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:21,994 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-27 09:16:21,994 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 09:16:21,994 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-27 09:16:21,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 09:16:21,995 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:21,995 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:21,996 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:21,996 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:21,996 INFO L82 PathProgramCache]: Analyzing trace with hash 1381705981, now seen corresponding path program 10 times [2018-10-27 09:16:21,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:21,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:21,997 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:21,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:21,997 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:22,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:22,395 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:22,395 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:22,395 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:22,395 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:22,396 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:22,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:22,396 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:22,404 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:22,404 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:22,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:22,429 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:22,491 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:22,491 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:23,025 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:23,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:23,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 09:16:23,047 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:23,047 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:16:23,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:16:23,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=470, Unknown=0, NotChecked=0, Total=756 [2018-10-27 09:16:23,049 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 15 states. [2018-10-27 09:16:23,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:23,097 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 09:16:23,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 09:16:23,097 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 41 [2018-10-27 09:16:23,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:23,098 INFO L225 Difference]: With dead ends: 51 [2018-10-27 09:16:23,098 INFO L226 Difference]: Without dead ends: 46 [2018-10-27 09:16:23,099 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2018-10-27 09:16:23,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-27 09:16:23,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-27 09:16:23,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-27 09:16:23,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-27 09:16:23,104 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-27 09:16:23,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:23,104 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-27 09:16:23,104 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:16:23,105 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-27 09:16:23,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-27 09:16:23,105 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:23,106 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:23,106 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:23,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:23,106 INFO L82 PathProgramCache]: Analyzing trace with hash 75574909, now seen corresponding path program 11 times [2018-10-27 09:16:23,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:23,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:23,107 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:23,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:23,107 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:23,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:23,319 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:23,319 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:23,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:23,320 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:23,320 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:23,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:23,320 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:23,329 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:23,329 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:23,384 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 09:16:23,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:23,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:23,604 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:23,605 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:24,129 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:24,149 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:24,149 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 09:16:24,150 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:24,150 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 09:16:24,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 09:16:24,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=535, Unknown=0, NotChecked=0, Total=870 [2018-10-27 09:16:24,151 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 16 states. [2018-10-27 09:16:24,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:24,230 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-27 09:16:24,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 09:16:24,231 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2018-10-27 09:16:24,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:24,232 INFO L225 Difference]: With dead ends: 54 [2018-10-27 09:16:24,232 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 09:16:24,233 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=341, Invalid=589, Unknown=0, NotChecked=0, Total=930 [2018-10-27 09:16:24,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 09:16:24,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-27 09:16:24,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 09:16:24,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-27 09:16:24,239 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-27 09:16:24,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:24,239 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-27 09:16:24,239 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 09:16:24,240 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-27 09:16:24,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 09:16:24,240 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:24,241 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:24,241 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:24,241 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:24,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1528510717, now seen corresponding path program 12 times [2018-10-27 09:16:24,241 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:24,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:24,242 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:24,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:24,242 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:24,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:24,548 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:24,548 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:24,548 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:24,548 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:24,548 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:24,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:24,549 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:24,558 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:24,558 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:24,590 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:24,590 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:24,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:24,735 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:24,735 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:25,053 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:25,076 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:25,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 09:16:25,076 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:25,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 09:16:25,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 09:16:25,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=604, Unknown=0, NotChecked=0, Total=992 [2018-10-27 09:16:25,078 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 17 states. [2018-10-27 09:16:25,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:25,150 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 09:16:25,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:16:25,154 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 47 [2018-10-27 09:16:25,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:25,155 INFO L225 Difference]: With dead ends: 57 [2018-10-27 09:16:25,155 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 09:16:25,156 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 09:16:25,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 09:16:25,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-27 09:16:25,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-27 09:16:25,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-27 09:16:25,161 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-27 09:16:25,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:25,162 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-27 09:16:25,162 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 09:16:25,162 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-27 09:16:25,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-27 09:16:25,163 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:25,163 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:25,163 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:25,163 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:25,164 INFO L82 PathProgramCache]: Analyzing trace with hash 1258757757, now seen corresponding path program 13 times [2018-10-27 09:16:25,164 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:25,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:25,165 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:25,165 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:25,165 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:25,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:25,435 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:25,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:25,436 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:25,436 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:25,436 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:25,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:25,436 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:25,444 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:25,445 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:25,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:25,485 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:25,558 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:25,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:25,904 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:25,925 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:25,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 09:16:25,925 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:25,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 09:16:25,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 09:16:25,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=677, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 09:16:25,927 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 18 states. [2018-10-27 09:16:25,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:25,971 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-27 09:16:25,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 09:16:25,972 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2018-10-27 09:16:25,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:25,973 INFO L225 Difference]: With dead ends: 60 [2018-10-27 09:16:25,973 INFO L226 Difference]: Without dead ends: 55 [2018-10-27 09:16:25,974 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=451, Invalid=739, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 09:16:25,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-27 09:16:25,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-27 09:16:25,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 09:16:25,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-27 09:16:25,979 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-27 09:16:25,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:25,979 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-27 09:16:25,979 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 09:16:25,979 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-27 09:16:25,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 09:16:25,980 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:25,980 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:25,981 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:25,981 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:25,981 INFO L82 PathProgramCache]: Analyzing trace with hash 932137213, now seen corresponding path program 14 times [2018-10-27 09:16:25,981 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:25,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:25,982 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:25,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:25,982 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:25,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:26,203 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:26,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:26,204 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:26,204 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:26,204 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:26,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:26,205 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:26,213 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:26,214 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:26,253 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 09:16:26,253 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:26,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:26,320 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:26,321 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:27,268 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:27,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:27,289 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 09:16:27,289 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:27,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 09:16:27,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 09:16:27,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=754, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:16:27,291 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 19 states. [2018-10-27 09:16:27,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:27,386 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-27 09:16:27,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 09:16:27,386 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 53 [2018-10-27 09:16:27,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:27,387 INFO L225 Difference]: With dead ends: 63 [2018-10-27 09:16:27,387 INFO L226 Difference]: Without dead ends: 58 [2018-10-27 09:16:27,388 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 09:16:27,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-27 09:16:27,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-27 09:16:27,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-27 09:16:27,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-27 09:16:27,393 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-27 09:16:27,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:27,393 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-27 09:16:27,393 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 09:16:27,394 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-27 09:16:27,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-27 09:16:27,396 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:27,396 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:27,396 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:27,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:27,397 INFO L82 PathProgramCache]: Analyzing trace with hash -1319563651, now seen corresponding path program 15 times [2018-10-27 09:16:27,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:27,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:27,398 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:27,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:27,398 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:27,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:27,935 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:27,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:27,935 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:27,935 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:27,935 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:27,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:27,935 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:27,946 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:27,946 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:27,974 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:27,974 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:27,976 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:28,075 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:28,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:29,151 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:29,171 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:29,172 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 09:16:29,172 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:29,172 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 09:16:29,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 09:16:29,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=571, Invalid=835, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:16:29,173 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 20 states. [2018-10-27 09:16:29,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:29,321 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-27 09:16:29,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 09:16:29,322 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 56 [2018-10-27 09:16:29,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:29,323 INFO L225 Difference]: With dead ends: 66 [2018-10-27 09:16:29,323 INFO L226 Difference]: Without dead ends: 61 [2018-10-27 09:16:29,324 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=577, Invalid=905, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 09:16:29,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-27 09:16:29,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-27 09:16:29,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-27 09:16:29,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-27 09:16:29,329 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-27 09:16:29,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:29,329 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-27 09:16:29,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 09:16:29,329 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-27 09:16:29,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-27 09:16:29,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:29,331 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:29,331 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:29,331 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:29,331 INFO L82 PathProgramCache]: Analyzing trace with hash 1354193149, now seen corresponding path program 16 times [2018-10-27 09:16:29,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:29,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:29,332 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:29,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:29,333 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:29,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:29,662 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:29,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:29,662 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:29,663 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:29,663 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:29,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:29,663 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:29,671 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:29,671 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:29,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:29,708 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:29,796 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:29,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:31,162 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:31,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:31,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 09:16:31,183 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:31,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:16:31,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:16:31,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=920, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 09:16:31,184 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 21 states. [2018-10-27 09:16:31,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:31,228 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-27 09:16:31,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 09:16:31,228 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 59 [2018-10-27 09:16:31,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:31,229 INFO L225 Difference]: With dead ends: 69 [2018-10-27 09:16:31,229 INFO L226 Difference]: Without dead ends: 64 [2018-10-27 09:16:31,230 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=646, Invalid=994, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 09:16:31,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-27 09:16:31,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-27 09:16:31,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-27 09:16:31,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-27 09:16:31,235 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-27 09:16:31,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:31,235 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-27 09:16:31,235 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:16:31,235 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-27 09:16:31,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-27 09:16:31,236 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:31,236 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:31,236 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:31,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:31,237 INFO L82 PathProgramCache]: Analyzing trace with hash 779550333, now seen corresponding path program 17 times [2018-10-27 09:16:31,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:31,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:31,238 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:31,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:31,238 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:31,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:32,361 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:32,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:32,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:32,361 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:32,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:32,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:32,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:32,368 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:32,368 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:32,405 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 09:16:32,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:32,408 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:32,445 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:32,445 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:33,168 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:33,188 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:33,188 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 09:16:33,188 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:33,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 09:16:33,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 09:16:33,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=1009, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 09:16:33,190 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 22 states. [2018-10-27 09:16:33,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:33,285 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-27 09:16:33,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:16:33,286 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 62 [2018-10-27 09:16:33,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:33,287 INFO L225 Difference]: With dead ends: 72 [2018-10-27 09:16:33,287 INFO L226 Difference]: Without dead ends: 67 [2018-10-27 09:16:33,288 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=719, Invalid=1087, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 09:16:33,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-27 09:16:33,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-27 09:16:33,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-27 09:16:33,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-27 09:16:33,291 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-27 09:16:33,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:33,292 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-27 09:16:33,292 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 09:16:33,292 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-27 09:16:33,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-27 09:16:33,293 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:33,293 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:33,293 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:33,293 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:33,293 INFO L82 PathProgramCache]: Analyzing trace with hash 1335060733, now seen corresponding path program 18 times [2018-10-27 09:16:33,293 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:33,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:33,294 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:33,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:33,295 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:33,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:33,586 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:33,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:33,587 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:33,587 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:33,587 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:33,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:33,587 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:33,599 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:33,599 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:33,652 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:33,652 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:33,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:33,772 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:33,773 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:34,267 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:34,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:34,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 09:16:34,288 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:34,288 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 09:16:34,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 09:16:34,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=790, Invalid=1102, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 09:16:34,289 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 23 states. [2018-10-27 09:16:34,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:34,387 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-27 09:16:34,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 09:16:34,388 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2018-10-27 09:16:34,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:34,389 INFO L225 Difference]: With dead ends: 75 [2018-10-27 09:16:34,389 INFO L226 Difference]: Without dead ends: 70 [2018-10-27 09:16:34,390 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=796, Invalid=1184, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 09:16:34,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-27 09:16:34,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-27 09:16:34,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-27 09:16:34,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-27 09:16:34,403 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-27 09:16:34,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:34,403 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-27 09:16:34,403 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 09:16:34,403 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-27 09:16:34,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-27 09:16:34,404 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:34,404 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:34,405 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:34,405 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:34,405 INFO L82 PathProgramCache]: Analyzing trace with hash 2036395645, now seen corresponding path program 19 times [2018-10-27 09:16:34,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:34,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:34,406 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:34,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:34,407 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:34,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:34,694 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:34,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:34,694 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:34,694 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:34,694 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:34,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:34,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:34,704 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:34,704 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:34,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:34,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:34,769 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:34,769 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:35,285 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:35,306 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:35,306 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-27 09:16:35,306 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:35,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 09:16:35,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 09:16:35,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=871, Invalid=1199, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:16:35,307 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 24 states. [2018-10-27 09:16:35,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:35,376 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-27 09:16:35,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 09:16:35,376 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 68 [2018-10-27 09:16:35,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:35,377 INFO L225 Difference]: With dead ends: 78 [2018-10-27 09:16:35,377 INFO L226 Difference]: Without dead ends: 73 [2018-10-27 09:16:35,378 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=877, Invalid=1285, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 09:16:35,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-27 09:16:35,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-27 09:16:35,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-27 09:16:35,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-27 09:16:35,381 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-27 09:16:35,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:35,381 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-27 09:16:35,382 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 09:16:35,382 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-27 09:16:35,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-27 09:16:35,382 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:35,383 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:35,383 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:35,383 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:35,383 INFO L82 PathProgramCache]: Analyzing trace with hash 488863997, now seen corresponding path program 20 times [2018-10-27 09:16:35,383 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:35,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:35,384 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:35,384 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:35,384 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:35,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:35,800 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:35,800 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:35,800 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:35,800 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:35,801 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:35,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:35,801 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:35,808 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:35,809 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:35,860 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 09:16:35,860 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:35,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:35,925 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:35,925 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:37,058 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:37,079 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:37,079 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-27 09:16:37,079 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:37,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 09:16:37,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 09:16:37,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=1300, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 09:16:37,081 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 25 states. [2018-10-27 09:16:37,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:37,137 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-27 09:16:37,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 09:16:37,141 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 71 [2018-10-27 09:16:37,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:37,141 INFO L225 Difference]: With dead ends: 81 [2018-10-27 09:16:37,141 INFO L226 Difference]: Without dead ends: 76 [2018-10-27 09:16:37,142 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=962, Invalid=1390, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 09:16:37,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-27 09:16:37,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-27 09:16:37,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-27 09:16:37,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-27 09:16:37,145 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-27 09:16:37,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:37,146 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-27 09:16:37,146 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 09:16:37,146 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-27 09:16:37,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-27 09:16:37,146 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:37,147 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:37,147 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:37,147 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:37,147 INFO L82 PathProgramCache]: Analyzing trace with hash 152493693, now seen corresponding path program 21 times [2018-10-27 09:16:37,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:37,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:37,148 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:37,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:37,148 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:37,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:37,713 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:37,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:37,713 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:37,713 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:37,713 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:37,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:37,713 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:37,721 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:37,721 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:37,767 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:37,768 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:37,770 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:37,830 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:37,830 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:38,800 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:38,820 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:38,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-27 09:16:38,820 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:38,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 09:16:38,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 09:16:38,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1045, Invalid=1405, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 09:16:38,822 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 26 states. [2018-10-27 09:16:38,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:38,902 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-27 09:16:38,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 09:16:38,903 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 74 [2018-10-27 09:16:38,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:38,904 INFO L225 Difference]: With dead ends: 84 [2018-10-27 09:16:38,904 INFO L226 Difference]: Without dead ends: 79 [2018-10-27 09:16:38,906 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1051, Invalid=1499, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 09:16:38,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-27 09:16:38,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-10-27 09:16:38,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-27 09:16:38,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-10-27 09:16:38,909 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-10-27 09:16:38,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:38,909 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-10-27 09:16:38,909 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 09:16:38,909 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-10-27 09:16:38,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-27 09:16:38,910 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:38,910 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:38,910 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:38,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:38,911 INFO L82 PathProgramCache]: Analyzing trace with hash -496531203, now seen corresponding path program 22 times [2018-10-27 09:16:38,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:38,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:38,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:38,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:38,912 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:38,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:40,308 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:40,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:40,309 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:40,309 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:40,309 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:40,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:40,309 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:40,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:40,318 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:40,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:40,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:40,404 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:40,404 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:41,091 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:41,111 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:41,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-27 09:16:41,112 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:41,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 09:16:41,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 09:16:41,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1138, Invalid=1514, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 09:16:41,113 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 27 states. [2018-10-27 09:16:41,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:41,175 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-27 09:16:41,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-27 09:16:41,175 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 77 [2018-10-27 09:16:41,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:41,176 INFO L225 Difference]: With dead ends: 87 [2018-10-27 09:16:41,176 INFO L226 Difference]: Without dead ends: 82 [2018-10-27 09:16:41,178 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1144, Invalid=1612, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 09:16:41,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-27 09:16:41,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-10-27 09:16:41,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-27 09:16:41,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-10-27 09:16:41,181 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 77 [2018-10-27 09:16:41,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:41,181 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-10-27 09:16:41,181 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 09:16:41,181 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-10-27 09:16:41,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-27 09:16:41,182 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:41,182 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:41,182 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:41,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:41,183 INFO L82 PathProgramCache]: Analyzing trace with hash 345558653, now seen corresponding path program 23 times [2018-10-27 09:16:41,183 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:41,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:41,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:41,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:41,184 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:41,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:41,543 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:41,543 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:41,543 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:41,544 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:41,544 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:41,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:41,544 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:41,552 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:41,552 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:41,604 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-27 09:16:41,604 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:41,606 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:41,958 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:41,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:42,865 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:42,886 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:42,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2018-10-27 09:16:42,887 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:42,887 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 09:16:42,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 09:16:42,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1235, Invalid=1627, Unknown=0, NotChecked=0, Total=2862 [2018-10-27 09:16:42,889 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 28 states. [2018-10-27 09:16:42,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:42,998 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-27 09:16:42,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 09:16:42,998 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 80 [2018-10-27 09:16:42,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:42,999 INFO L225 Difference]: With dead ends: 90 [2018-10-27 09:16:42,999 INFO L226 Difference]: Without dead ends: 85 [2018-10-27 09:16:43,000 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1241, Invalid=1729, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 09:16:43,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-27 09:16:43,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2018-10-27 09:16:43,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-27 09:16:43,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-10-27 09:16:43,003 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 80 [2018-10-27 09:16:43,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:43,004 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-10-27 09:16:43,004 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 09:16:43,004 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-10-27 09:16:43,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-27 09:16:43,005 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:43,005 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:43,005 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:43,005 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:43,005 INFO L82 PathProgramCache]: Analyzing trace with hash 140482813, now seen corresponding path program 24 times [2018-10-27 09:16:43,006 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:43,006 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:43,006 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:43,006 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:43,007 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:43,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:43,564 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:43,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:43,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:43,564 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:43,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:43,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:43,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:43,572 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:43,572 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:43,620 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:43,620 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:43,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:43,667 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:43,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:44,442 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:44,463 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:44,463 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-27 09:16:44,463 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:44,464 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 09:16:44,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 09:16:44,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 09:16:44,465 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 29 states. [2018-10-27 09:16:44,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:44,536 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-27 09:16:44,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 09:16:44,537 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 83 [2018-10-27 09:16:44,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:44,538 INFO L225 Difference]: With dead ends: 93 [2018-10-27 09:16:44,538 INFO L226 Difference]: Without dead ends: 88 [2018-10-27 09:16:44,540 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 09:16:44,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-27 09:16:44,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-10-27 09:16:44,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-27 09:16:44,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-10-27 09:16:44,544 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 83 [2018-10-27 09:16:44,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:44,544 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-10-27 09:16:44,544 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 09:16:44,544 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-10-27 09:16:44,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-27 09:16:44,545 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:44,545 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:44,545 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:44,545 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:44,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1830371715, now seen corresponding path program 25 times [2018-10-27 09:16:44,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:44,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:44,546 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:44,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:44,547 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:44,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:45,303 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:45,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:45,304 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:45,304 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:45,304 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:45,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:45,304 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:45,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:45,312 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:45,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:45,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:45,481 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:45,482 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:46,346 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:46,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:46,367 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-27 09:16:46,367 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:46,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 09:16:46,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 09:16:46,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1441, Invalid=1865, Unknown=0, NotChecked=0, Total=3306 [2018-10-27 09:16:46,368 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 30 states. [2018-10-27 09:16:46,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:46,459 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-27 09:16:46,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 09:16:46,460 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 86 [2018-10-27 09:16:46,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:46,460 INFO L225 Difference]: With dead ends: 96 [2018-10-27 09:16:46,461 INFO L226 Difference]: Without dead ends: 91 [2018-10-27 09:16:46,461 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1447, Invalid=1975, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 09:16:46,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-27 09:16:46,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-27 09:16:46,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-27 09:16:46,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-10-27 09:16:46,465 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 86 [2018-10-27 09:16:46,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:46,465 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-10-27 09:16:46,465 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 09:16:46,465 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-10-27 09:16:46,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-27 09:16:46,466 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:46,466 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:46,466 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:46,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:46,467 INFO L82 PathProgramCache]: Analyzing trace with hash 940288253, now seen corresponding path program 26 times [2018-10-27 09:16:46,467 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:46,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:46,467 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:46,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:46,468 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:46,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:46,992 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:46,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:46,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:46,993 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:46,993 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:46,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:46,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:47,000 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:47,000 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:47,054 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-27 09:16:47,054 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:47,057 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:47,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:47,118 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:48,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:48,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:48,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2018-10-27 09:16:48,610 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:48,610 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 09:16:48,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 09:16:48,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1550, Invalid=1990, Unknown=0, NotChecked=0, Total=3540 [2018-10-27 09:16:48,611 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 31 states. [2018-10-27 09:16:48,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:48,690 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-27 09:16:48,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 09:16:48,691 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 89 [2018-10-27 09:16:48,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:48,692 INFO L225 Difference]: With dead ends: 99 [2018-10-27 09:16:48,692 INFO L226 Difference]: Without dead ends: 94 [2018-10-27 09:16:48,693 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1556, Invalid=2104, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 09:16:48,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-27 09:16:48,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-10-27 09:16:48,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-27 09:16:48,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-10-27 09:16:48,697 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 89 [2018-10-27 09:16:48,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:48,697 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-10-27 09:16:48,697 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 09:16:48,697 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-10-27 09:16:48,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-27 09:16:48,697 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:48,697 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:48,698 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:48,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:48,698 INFO L82 PathProgramCache]: Analyzing trace with hash 989900413, now seen corresponding path program 27 times [2018-10-27 09:16:48,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:48,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:48,699 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:48,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:48,699 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:48,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:49,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:49,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:49,328 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:49,328 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:49,328 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:49,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:49,328 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:49,337 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:49,338 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:49,382 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:49,382 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:49,385 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:49,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:49,457 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:50,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:50,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:50,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-27 09:16:50,665 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:50,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 09:16:50,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 09:16:50,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1663, Invalid=2119, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 09:16:50,667 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 32 states. [2018-10-27 09:16:50,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:50,787 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-27 09:16:50,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 09:16:50,787 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 92 [2018-10-27 09:16:50,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:50,788 INFO L225 Difference]: With dead ends: 102 [2018-10-27 09:16:50,788 INFO L226 Difference]: Without dead ends: 97 [2018-10-27 09:16:50,789 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 154 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1669, Invalid=2237, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 09:16:50,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-27 09:16:50,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2018-10-27 09:16:50,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-27 09:16:50,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-10-27 09:16:50,794 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 92 [2018-10-27 09:16:50,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:50,794 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-10-27 09:16:50,794 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 09:16:50,794 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-10-27 09:16:50,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-27 09:16:50,795 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:50,795 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:50,795 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:50,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:50,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1517009149, now seen corresponding path program 28 times [2018-10-27 09:16:50,796 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:50,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:50,796 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:50,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:50,797 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:50,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:51,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:51,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:51,292 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:51,292 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:51,293 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:51,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:51,293 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:51,301 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:51,302 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:51,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:51,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:51,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:51,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:52,424 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:52,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:52,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2018-10-27 09:16:52,444 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:52,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 09:16:52,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 09:16:52,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1780, Invalid=2252, Unknown=0, NotChecked=0, Total=4032 [2018-10-27 09:16:52,446 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 33 states. [2018-10-27 09:16:52,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:52,540 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-27 09:16:52,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-27 09:16:52,550 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 95 [2018-10-27 09:16:52,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:52,551 INFO L225 Difference]: With dead ends: 105 [2018-10-27 09:16:52,551 INFO L226 Difference]: Without dead ends: 100 [2018-10-27 09:16:52,552 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1786, Invalid=2374, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 09:16:52,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-27 09:16:52,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-10-27 09:16:52,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-27 09:16:52,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-10-27 09:16:52,555 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 95 [2018-10-27 09:16:52,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:52,556 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-10-27 09:16:52,556 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 09:16:52,556 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-10-27 09:16:52,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-27 09:16:52,557 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:52,557 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:52,557 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:52,557 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:52,557 INFO L82 PathProgramCache]: Analyzing trace with hash -2082038147, now seen corresponding path program 29 times [2018-10-27 09:16:52,557 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:52,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:52,558 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:52,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:52,558 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:52,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:53,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:53,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:53,205 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:53,205 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:53,205 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:53,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:53,205 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:53,212 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:16:53,212 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:16:53,285 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-27 09:16:53,285 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:53,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:53,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:53,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:54,647 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:54,667 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:54,667 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2018-10-27 09:16:54,667 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:54,668 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 09:16:54,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 09:16:54,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=2389, Unknown=0, NotChecked=0, Total=4290 [2018-10-27 09:16:54,669 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 34 states. [2018-10-27 09:16:54,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:54,777 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-27 09:16:54,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 09:16:54,778 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 98 [2018-10-27 09:16:54,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:54,778 INFO L225 Difference]: With dead ends: 108 [2018-10-27 09:16:54,778 INFO L226 Difference]: Without dead ends: 103 [2018-10-27 09:16:54,779 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1907, Invalid=2515, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 09:16:54,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-27 09:16:54,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-27 09:16:54,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-27 09:16:54,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-10-27 09:16:54,783 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 98 [2018-10-27 09:16:54,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:54,783 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-10-27 09:16:54,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 09:16:54,784 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-10-27 09:16:54,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-27 09:16:54,784 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:54,784 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:54,785 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:54,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:54,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1736455939, now seen corresponding path program 30 times [2018-10-27 09:16:54,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:54,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:54,786 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:54,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:54,786 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:54,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:55,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:55,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:55,444 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:55,444 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:55,444 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:55,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:55,444 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:55,453 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:16:55,453 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:16:55,505 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:16:55,505 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:16:55,508 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:55,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:55,544 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:56,695 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:56,715 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:56,715 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-27 09:16:56,716 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:56,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 09:16:56,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 09:16:56,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2026, Invalid=2530, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 09:16:56,717 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 35 states. [2018-10-27 09:16:56,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:56,847 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-27 09:16:56,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 09:16:56,847 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 101 [2018-10-27 09:16:56,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:56,848 INFO L225 Difference]: With dead ends: 111 [2018-10-27 09:16:56,849 INFO L226 Difference]: Without dead ends: 106 [2018-10-27 09:16:56,850 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 169 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 09:16:56,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-27 09:16:56,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-10-27 09:16:56,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-27 09:16:56,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2018-10-27 09:16:56,854 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 101 [2018-10-27 09:16:56,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:56,854 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2018-10-27 09:16:56,854 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 09:16:56,854 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2018-10-27 09:16:56,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-27 09:16:56,855 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:56,855 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:56,855 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:56,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:56,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1533505923, now seen corresponding path program 31 times [2018-10-27 09:16:56,856 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:56,856 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:56,856 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:16:56,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:56,857 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:56,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:57,381 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:57,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:57,382 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:16:57,382 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:16:57,382 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:16:57,382 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:16:57,382 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:16:57,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:57,391 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:16:57,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:16:57,445 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:16:57,518 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:57,518 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:16:59,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:16:59,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:16:59,184 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 70 [2018-10-27 09:16:59,184 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:16:59,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 09:16:59,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 09:16:59,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2155, Invalid=2675, Unknown=0, NotChecked=0, Total=4830 [2018-10-27 09:16:59,185 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 36 states. [2018-10-27 09:16:59,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:16:59,317 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-27 09:16:59,318 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-27 09:16:59,318 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 104 [2018-10-27 09:16:59,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:16:59,318 INFO L225 Difference]: With dead ends: 114 [2018-10-27 09:16:59,318 INFO L226 Difference]: Without dead ends: 109 [2018-10-27 09:16:59,319 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2161, Invalid=2809, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 09:16:59,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-27 09:16:59,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2018-10-27 09:16:59,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-27 09:16:59,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-10-27 09:16:59,323 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 104 [2018-10-27 09:16:59,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:16:59,324 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-10-27 09:16:59,324 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 09:16:59,324 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-10-27 09:16:59,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-27 09:16:59,325 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:16:59,325 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:16:59,325 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:16:59,325 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:16:59,325 INFO L82 PathProgramCache]: Analyzing trace with hash 1531435261, now seen corresponding path program 32 times [2018-10-27 09:16:59,325 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:16:59,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:59,326 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:16:59,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:16:59,326 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:16:59,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:00,049 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:00,049 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:00,050 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:00,050 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:00,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:00,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:00,050 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:00,057 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:17:00,057 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:17:00,126 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-27 09:17:00,126 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:00,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:00,276 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:00,276 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:01,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:01,582 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:01,582 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 72 [2018-10-27 09:17:01,583 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:01,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 09:17:01,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 09:17:01,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2288, Invalid=2824, Unknown=0, NotChecked=0, Total=5112 [2018-10-27 09:17:01,584 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 37 states. [2018-10-27 09:17:01,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:01,652 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-27 09:17:01,653 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 09:17:01,653 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 107 [2018-10-27 09:17:01,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:01,654 INFO L225 Difference]: With dead ends: 117 [2018-10-27 09:17:01,654 INFO L226 Difference]: Without dead ends: 112 [2018-10-27 09:17:01,655 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 179 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2294, Invalid=2962, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 09:17:01,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-27 09:17:01,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-27 09:17:01,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-27 09:17:01,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-10-27 09:17:01,659 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 107 [2018-10-27 09:17:01,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:01,659 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-10-27 09:17:01,659 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 09:17:01,659 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-10-27 09:17:01,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-27 09:17:01,660 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:01,660 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:01,660 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:01,660 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:01,660 INFO L82 PathProgramCache]: Analyzing trace with hash -1810465155, now seen corresponding path program 33 times [2018-10-27 09:17:01,660 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:01,661 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:01,661 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:01,661 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:01,661 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:01,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:02,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:02,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:02,911 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:02,911 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:02,911 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:02,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:02,911 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:02,918 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:17:02,918 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:17:02,975 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:17:02,975 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:02,978 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:03,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:03,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:04,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:04,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:04,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-27 09:17:04,685 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:04,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 09:17:04,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 09:17:04,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 09:17:04,686 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 38 states. [2018-10-27 09:17:04,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:04,767 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-27 09:17:04,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 09:17:04,767 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 110 [2018-10-27 09:17:04,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:04,768 INFO L225 Difference]: With dead ends: 120 [2018-10-27 09:17:04,768 INFO L226 Difference]: Without dead ends: 115 [2018-10-27 09:17:04,769 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 184 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2431, Invalid=3119, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 09:17:04,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-27 09:17:04,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-10-27 09:17:04,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-27 09:17:04,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-10-27 09:17:04,773 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 110 [2018-10-27 09:17:04,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:04,774 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-10-27 09:17:04,774 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 09:17:04,774 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-10-27 09:17:04,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-27 09:17:04,774 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:04,775 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:04,775 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:04,775 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:04,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1271130365, now seen corresponding path program 34 times [2018-10-27 09:17:04,775 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:04,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:04,776 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:04,776 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:04,776 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:04,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:05,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:05,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:05,951 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:05,951 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:05,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:05,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:05,951 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:05,959 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:05,960 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:17:06,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:06,022 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:06,064 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:06,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:07,479 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:07,501 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:07,501 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-10-27 09:17:07,501 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:07,501 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 09:17:07,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 09:17:07,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2566, Invalid=3134, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 09:17:07,502 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 39 states. [2018-10-27 09:17:07,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:07,756 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-27 09:17:07,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 09:17:07,757 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 113 [2018-10-27 09:17:07,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:07,758 INFO L225 Difference]: With dead ends: 123 [2018-10-27 09:17:07,758 INFO L226 Difference]: Without dead ends: 118 [2018-10-27 09:17:07,759 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2572, Invalid=3280, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 09:17:07,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-27 09:17:07,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-10-27 09:17:07,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-27 09:17:07,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2018-10-27 09:17:07,764 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 113 [2018-10-27 09:17:07,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:07,764 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2018-10-27 09:17:07,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 09:17:07,765 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2018-10-27 09:17:07,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-27 09:17:07,765 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:07,765 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:07,765 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:07,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:07,766 INFO L82 PathProgramCache]: Analyzing trace with hash 157314685, now seen corresponding path program 35 times [2018-10-27 09:17:07,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:07,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:07,766 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:07,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:07,766 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:07,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:08,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:08,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:08,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:08,778 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:08,778 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:08,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:08,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:08,786 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:17:08,786 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:17:08,865 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-27 09:17:08,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:08,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:08,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:08,954 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:10,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:10,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:10,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 78 [2018-10-27 09:17:10,529 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:10,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 09:17:10,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 09:17:10,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2711, Invalid=3295, Unknown=0, NotChecked=0, Total=6006 [2018-10-27 09:17:10,530 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 40 states. [2018-10-27 09:17:10,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:10,617 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-27 09:17:10,618 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 09:17:10,618 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 116 [2018-10-27 09:17:10,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:10,619 INFO L225 Difference]: With dead ends: 126 [2018-10-27 09:17:10,619 INFO L226 Difference]: Without dead ends: 121 [2018-10-27 09:17:10,619 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 194 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2717, Invalid=3445, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 09:17:10,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-27 09:17:10,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-10-27 09:17:10,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-27 09:17:10,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-10-27 09:17:10,623 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 116 [2018-10-27 09:17:10,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:10,624 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-10-27 09:17:10,624 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 09:17:10,624 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-10-27 09:17:10,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-27 09:17:10,624 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:10,625 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:10,625 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:10,625 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:10,625 INFO L82 PathProgramCache]: Analyzing trace with hash 1391720701, now seen corresponding path program 36 times [2018-10-27 09:17:10,625 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:10,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:10,626 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:10,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:10,626 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:10,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:11,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:11,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:11,384 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:11,384 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:11,385 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:11,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:11,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:11,392 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:17:11,392 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:17:11,448 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:17:11,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:11,450 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:11,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:11,679 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:13,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:13,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:13,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-27 09:17:13,352 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:13,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 09:17:13,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 09:17:13,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2860, Invalid=3460, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 09:17:13,354 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 41 states. [2018-10-27 09:17:13,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:13,447 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-27 09:17:13,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 09:17:13,448 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 119 [2018-10-27 09:17:13,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:13,449 INFO L225 Difference]: With dead ends: 129 [2018-10-27 09:17:13,449 INFO L226 Difference]: Without dead ends: 124 [2018-10-27 09:17:13,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2866, Invalid=3614, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 09:17:13,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-27 09:17:13,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-10-27 09:17:13,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-27 09:17:13,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-10-27 09:17:13,454 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 119 [2018-10-27 09:17:13,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:13,455 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-10-27 09:17:13,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 09:17:13,455 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-10-27 09:17:13,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-27 09:17:13,455 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:13,456 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:13,456 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:13,456 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:13,456 INFO L82 PathProgramCache]: Analyzing trace with hash 2071355005, now seen corresponding path program 37 times [2018-10-27 09:17:13,456 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:13,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:13,457 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:13,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:13,457 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:13,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:14,177 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:14,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:14,177 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:14,177 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:14,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:14,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:14,178 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:14,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:14,185 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:17:14,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:14,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:14,341 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:14,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:16,019 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:16,039 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:16,039 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 82 [2018-10-27 09:17:16,039 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:16,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 09:17:16,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 09:17:16,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3013, Invalid=3629, Unknown=0, NotChecked=0, Total=6642 [2018-10-27 09:17:16,041 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 42 states. [2018-10-27 09:17:16,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:16,184 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-27 09:17:16,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-27 09:17:16,184 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 122 [2018-10-27 09:17:16,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:16,185 INFO L225 Difference]: With dead ends: 132 [2018-10-27 09:17:16,186 INFO L226 Difference]: Without dead ends: 127 [2018-10-27 09:17:16,186 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 204 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3019, Invalid=3787, Unknown=0, NotChecked=0, Total=6806 [2018-10-27 09:17:16,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-27 09:17:16,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2018-10-27 09:17:16,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-27 09:17:16,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-10-27 09:17:16,190 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 122 [2018-10-27 09:17:16,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:16,191 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-10-27 09:17:16,191 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 09:17:16,191 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-10-27 09:17:16,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-27 09:17:16,191 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:16,192 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:16,192 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:16,192 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:16,192 INFO L82 PathProgramCache]: Analyzing trace with hash -1713895171, now seen corresponding path program 38 times [2018-10-27 09:17:16,192 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:16,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:16,193 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:16,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:16,193 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:16,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:17,003 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:17,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:17,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:17,004 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:17,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:17,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:17,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:17,012 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:17:17,012 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:17:17,097 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-27 09:17:17,097 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:17,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:17,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:17,662 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:19,617 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:19,637 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:19,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 84 [2018-10-27 09:17:19,638 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:19,638 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 09:17:19,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 09:17:19,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3170, Invalid=3802, Unknown=0, NotChecked=0, Total=6972 [2018-10-27 09:17:19,639 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 43 states. [2018-10-27 09:17:19,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:19,762 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-27 09:17:19,762 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 09:17:19,762 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 125 [2018-10-27 09:17:19,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:19,763 INFO L225 Difference]: With dead ends: 135 [2018-10-27 09:17:19,763 INFO L226 Difference]: Without dead ends: 130 [2018-10-27 09:17:19,764 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 209 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=3176, Invalid=3964, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 09:17:19,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-27 09:17:19,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-10-27 09:17:19,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-27 09:17:19,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2018-10-27 09:17:19,768 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 125 [2018-10-27 09:17:19,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:19,768 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2018-10-27 09:17:19,769 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 09:17:19,769 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2018-10-27 09:17:19,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-27 09:17:19,769 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:19,770 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:19,770 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:19,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:19,770 INFO L82 PathProgramCache]: Analyzing trace with hash 559435389, now seen corresponding path program 39 times [2018-10-27 09:17:19,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:19,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:19,771 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:19,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:19,771 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:19,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:20,683 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:20,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:20,684 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:20,684 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:20,684 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:20,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:20,684 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:20,692 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:17:20,692 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:17:20,757 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:17:20,757 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:20,761 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:20,838 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:20,838 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:22,678 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:22,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:22,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-27 09:17:22,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:22,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 09:17:22,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 09:17:22,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3331, Invalid=3979, Unknown=0, NotChecked=0, Total=7310 [2018-10-27 09:17:22,710 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 44 states. [2018-10-27 09:17:22,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:22,984 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-10-27 09:17:22,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 09:17:22,984 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 128 [2018-10-27 09:17:22,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:22,986 INFO L225 Difference]: With dead ends: 138 [2018-10-27 09:17:22,986 INFO L226 Difference]: Without dead ends: 133 [2018-10-27 09:17:22,987 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 214 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3337, Invalid=4145, Unknown=0, NotChecked=0, Total=7482 [2018-10-27 09:17:22,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-27 09:17:22,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2018-10-27 09:17:22,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-27 09:17:22,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-10-27 09:17:22,991 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 128 [2018-10-27 09:17:22,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:22,992 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-10-27 09:17:22,992 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 09:17:22,992 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-10-27 09:17:22,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-27 09:17:22,993 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:22,993 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:22,993 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:22,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:22,993 INFO L82 PathProgramCache]: Analyzing trace with hash -1989142275, now seen corresponding path program 40 times [2018-10-27 09:17:22,994 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:22,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:22,994 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:22,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:22,994 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:23,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:25,194 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:25,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:25,195 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:25,195 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:25,195 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:25,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:25,195 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:25,204 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:25,204 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:17:25,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:25,271 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:25,363 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:25,363 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:27,328 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:27,357 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:27,357 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 88 [2018-10-27 09:17:27,358 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:27,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 09:17:27,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 09:17:27,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3496, Invalid=4160, Unknown=0, NotChecked=0, Total=7656 [2018-10-27 09:17:27,360 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 45 states. [2018-10-27 09:17:27,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:27,540 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-10-27 09:17:27,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-27 09:17:27,541 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 131 [2018-10-27 09:17:27,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:27,543 INFO L225 Difference]: With dead ends: 141 [2018-10-27 09:17:27,543 INFO L226 Difference]: Without dead ends: 136 [2018-10-27 09:17:27,544 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 219 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3502, Invalid=4330, Unknown=0, NotChecked=0, Total=7832 [2018-10-27 09:17:27,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-27 09:17:27,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-10-27 09:17:27,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-27 09:17:27,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-10-27 09:17:27,549 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 131 [2018-10-27 09:17:27,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:27,549 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-10-27 09:17:27,549 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 09:17:27,549 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-10-27 09:17:27,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-27 09:17:27,550 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:27,550 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:27,551 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:27,551 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:27,551 INFO L82 PathProgramCache]: Analyzing trace with hash -234471811, now seen corresponding path program 41 times [2018-10-27 09:17:27,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:27,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:27,552 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:27,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:27,552 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:27,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:28,381 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:28,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:28,381 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:28,381 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:28,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:28,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:28,381 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:28,391 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:17:28,391 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:17:28,594 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-27 09:17:28,595 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:28,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:28,780 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:28,780 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:30,815 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:30,835 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:30,836 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 90 [2018-10-27 09:17:30,836 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:30,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-27 09:17:30,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-27 09:17:30,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3665, Invalid=4345, Unknown=0, NotChecked=0, Total=8010 [2018-10-27 09:17:30,837 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 46 states. [2018-10-27 09:17:31,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:31,390 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-10-27 09:17:31,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 09:17:31,391 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 134 [2018-10-27 09:17:31,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:31,392 INFO L225 Difference]: With dead ends: 144 [2018-10-27 09:17:31,392 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 09:17:31,393 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 224 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3671, Invalid=4519, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 09:17:31,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 09:17:31,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-10-27 09:17:31,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-27 09:17:31,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-10-27 09:17:31,397 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 134 [2018-10-27 09:17:31,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:31,397 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-10-27 09:17:31,397 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-27 09:17:31,397 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-10-27 09:17:31,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-27 09:17:31,398 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:31,398 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:31,398 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:31,398 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:31,399 INFO L82 PathProgramCache]: Analyzing trace with hash -893638403, now seen corresponding path program 42 times [2018-10-27 09:17:31,399 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:31,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:31,399 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:31,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:31,400 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:31,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:32,214 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:32,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:32,215 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:32,215 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:32,215 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:32,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:32,215 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:32,223 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:17:32,223 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:17:32,288 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:17:32,288 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:32,291 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:32,402 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:32,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:34,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:34,617 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:34,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-27 09:17:34,617 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:34,618 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 09:17:34,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 09:17:34,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3838, Invalid=4534, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 09:17:34,618 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 47 states. [2018-10-27 09:17:34,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:34,740 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-10-27 09:17:34,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 09:17:34,740 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 137 [2018-10-27 09:17:34,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:34,741 INFO L225 Difference]: With dead ends: 147 [2018-10-27 09:17:34,742 INFO L226 Difference]: Without dead ends: 142 [2018-10-27 09:17:34,742 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 229 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3844, Invalid=4712, Unknown=0, NotChecked=0, Total=8556 [2018-10-27 09:17:34,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-27 09:17:34,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-10-27 09:17:34,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-27 09:17:34,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2018-10-27 09:17:34,746 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 137 [2018-10-27 09:17:34,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:34,747 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2018-10-27 09:17:34,747 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 09:17:34,747 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2018-10-27 09:17:34,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-27 09:17:34,747 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:34,748 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:34,748 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:34,748 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:34,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1535103363, now seen corresponding path program 43 times [2018-10-27 09:17:34,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:34,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:34,749 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:34,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:34,749 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:34,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:35,653 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:35,653 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:35,653 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:35,653 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:35,654 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:35,654 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:35,654 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:35,661 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:35,661 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:17:35,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:35,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:35,772 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:35,772 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:37,945 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:37,965 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:37,965 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-10-27 09:17:37,966 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:37,966 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 09:17:37,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 09:17:37,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4015, Invalid=4727, Unknown=0, NotChecked=0, Total=8742 [2018-10-27 09:17:37,967 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 48 states. [2018-10-27 09:17:38,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:38,070 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-10-27 09:17:38,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-27 09:17:38,070 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 140 [2018-10-27 09:17:38,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:38,071 INFO L225 Difference]: With dead ends: 150 [2018-10-27 09:17:38,071 INFO L226 Difference]: Without dead ends: 145 [2018-10-27 09:17:38,072 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 234 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=4021, Invalid=4909, Unknown=0, NotChecked=0, Total=8930 [2018-10-27 09:17:38,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-27 09:17:38,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2018-10-27 09:17:38,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-27 09:17:38,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-10-27 09:17:38,075 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 140 [2018-10-27 09:17:38,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:38,076 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-10-27 09:17:38,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 09:17:38,076 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-10-27 09:17:38,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-27 09:17:38,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:38,077 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:38,077 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:38,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:38,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1186740477, now seen corresponding path program 44 times [2018-10-27 09:17:38,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:38,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:38,078 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:38,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:38,078 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:38,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:39,433 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:39,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:39,434 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:39,434 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:39,434 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:39,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:39,434 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:39,445 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:17:39,445 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:17:39,551 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-10-27 09:17:39,552 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:39,554 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:39,618 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:39,618 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:41,899 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:41,920 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:41,920 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-10-27 09:17:41,920 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:41,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 09:17:41,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 09:17:41,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4196, Invalid=4924, Unknown=0, NotChecked=0, Total=9120 [2018-10-27 09:17:41,922 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 49 states. [2018-10-27 09:17:42,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:42,548 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-10-27 09:17:42,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 09:17:42,548 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 143 [2018-10-27 09:17:42,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:42,549 INFO L225 Difference]: With dead ends: 153 [2018-10-27 09:17:42,549 INFO L226 Difference]: Without dead ends: 148 [2018-10-27 09:17:42,550 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 239 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4202, Invalid=5110, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 09:17:42,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-27 09:17:42,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-10-27 09:17:42,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-27 09:17:42,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-10-27 09:17:42,556 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 143 [2018-10-27 09:17:42,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:42,556 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-10-27 09:17:42,556 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 09:17:42,557 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-10-27 09:17:42,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-27 09:17:42,557 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:42,557 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:42,558 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:42,558 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:42,558 INFO L82 PathProgramCache]: Analyzing trace with hash -1345970563, now seen corresponding path program 45 times [2018-10-27 09:17:42,558 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:42,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:42,559 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:42,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:42,559 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:42,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:43,511 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:43,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:43,511 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:43,511 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:43,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:43,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:43,511 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:43,521 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:17:43,521 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:17:43,595 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:17:43,595 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:43,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:43,740 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:43,740 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:46,077 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:46,097 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:46,097 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-27 09:17:46,097 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:46,098 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-27 09:17:46,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-27 09:17:46,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4381, Invalid=5125, Unknown=0, NotChecked=0, Total=9506 [2018-10-27 09:17:46,099 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 50 states. [2018-10-27 09:17:46,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:46,198 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-10-27 09:17:46,198 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 09:17:46,199 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 146 [2018-10-27 09:17:46,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:46,199 INFO L225 Difference]: With dead ends: 156 [2018-10-27 09:17:46,199 INFO L226 Difference]: Without dead ends: 151 [2018-10-27 09:17:46,200 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 244 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4387, Invalid=5315, Unknown=0, NotChecked=0, Total=9702 [2018-10-27 09:17:46,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-27 09:17:46,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-10-27 09:17:46,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-27 09:17:46,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-10-27 09:17:46,203 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 146 [2018-10-27 09:17:46,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:46,204 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-10-27 09:17:46,204 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-27 09:17:46,204 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-10-27 09:17:46,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-27 09:17:46,204 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:46,205 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:46,205 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:46,205 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:46,205 INFO L82 PathProgramCache]: Analyzing trace with hash 644892925, now seen corresponding path program 46 times [2018-10-27 09:17:46,205 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:46,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:46,206 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:46,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:46,206 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:46,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:47,146 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:47,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:47,146 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:47,146 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:47,146 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:47,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:47,147 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:47,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:47,157 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:17:47,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:47,227 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:47,361 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:47,361 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:50,070 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:50,091 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:50,091 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 100 [2018-10-27 09:17:50,091 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:50,092 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 09:17:50,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 09:17:50,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4570, Invalid=5330, Unknown=0, NotChecked=0, Total=9900 [2018-10-27 09:17:50,092 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 51 states. [2018-10-27 09:17:50,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:50,225 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-10-27 09:17:50,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-27 09:17:50,226 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 149 [2018-10-27 09:17:50,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:50,226 INFO L225 Difference]: With dead ends: 159 [2018-10-27 09:17:50,227 INFO L226 Difference]: Without dead ends: 154 [2018-10-27 09:17:50,227 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 249 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4576, Invalid=5524, Unknown=0, NotChecked=0, Total=10100 [2018-10-27 09:17:50,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-27 09:17:50,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-10-27 09:17:50,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-27 09:17:50,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2018-10-27 09:17:50,231 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 149 [2018-10-27 09:17:50,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:50,231 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2018-10-27 09:17:50,231 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 09:17:50,231 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2018-10-27 09:17:50,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-27 09:17:50,232 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:50,232 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:50,233 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:50,233 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:50,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1255673469, now seen corresponding path program 47 times [2018-10-27 09:17:50,233 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:50,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:50,234 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:50,234 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:50,234 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:50,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:51,280 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:51,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:51,281 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:51,281 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:51,281 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:51,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:51,281 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:51,290 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:17:51,290 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:17:51,395 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-27 09:17:51,395 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:51,398 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:51,465 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:51,465 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:54,023 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:54,043 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:54,043 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 102 [2018-10-27 09:17:54,043 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:54,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-27 09:17:54,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-27 09:17:54,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4763, Invalid=5539, Unknown=0, NotChecked=0, Total=10302 [2018-10-27 09:17:54,045 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 52 states. [2018-10-27 09:17:54,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:54,172 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-10-27 09:17:54,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-27 09:17:54,172 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 152 [2018-10-27 09:17:54,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:54,174 INFO L225 Difference]: With dead ends: 162 [2018-10-27 09:17:54,174 INFO L226 Difference]: Without dead ends: 157 [2018-10-27 09:17:54,175 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 254 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4769, Invalid=5737, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 09:17:54,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-27 09:17:54,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-10-27 09:17:54,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-10-27 09:17:54,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-10-27 09:17:54,179 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 152 [2018-10-27 09:17:54,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:54,179 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-10-27 09:17:54,179 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-27 09:17:54,180 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-10-27 09:17:54,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-27 09:17:54,180 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:54,181 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:54,181 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:54,181 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:54,181 INFO L82 PathProgramCache]: Analyzing trace with hash -757573379, now seen corresponding path program 48 times [2018-10-27 09:17:54,181 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:54,182 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:54,182 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:54,182 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:54,182 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:54,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:55,170 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:55,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:55,171 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:55,171 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:55,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:55,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:55,171 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:55,178 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:17:55,178 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:17:55,258 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:17:55,258 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:17:55,262 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:55,653 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:55,653 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:17:58,270 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:58,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:17:58,291 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-27 09:17:58,291 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:17:58,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-27 09:17:58,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-27 09:17:58,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4960, Invalid=5752, Unknown=0, NotChecked=0, Total=10712 [2018-10-27 09:17:58,292 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 53 states. [2018-10-27 09:17:58,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:17:58,449 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-10-27 09:17:58,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 09:17:58,449 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 155 [2018-10-27 09:17:58,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:17:58,450 INFO L225 Difference]: With dead ends: 165 [2018-10-27 09:17:58,450 INFO L226 Difference]: Without dead ends: 160 [2018-10-27 09:17:58,451 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 259 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4966, Invalid=5954, Unknown=0, NotChecked=0, Total=10920 [2018-10-27 09:17:58,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-27 09:17:58,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-27 09:17:58,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-27 09:17:58,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-10-27 09:17:58,454 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 155 [2018-10-27 09:17:58,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:17:58,454 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-10-27 09:17:58,454 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-27 09:17:58,454 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-10-27 09:17:58,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-27 09:17:58,455 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:17:58,455 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:17:58,455 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:17:58,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:17:58,456 INFO L82 PathProgramCache]: Analyzing trace with hash 1823866493, now seen corresponding path program 49 times [2018-10-27 09:17:58,456 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:17:58,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:58,456 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:17:58,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:17:58,457 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:17:58,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:59,665 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:59,665 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:59,665 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:17:59,666 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:17:59,666 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:17:59,666 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:17:59,666 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:17:59,673 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:17:59,673 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:17:59,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:17:59,752 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:17:59,964 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:17:59,964 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:02,685 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:02,705 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:02,705 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 106 [2018-10-27 09:18:02,705 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:02,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 09:18:02,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 09:18:02,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5161, Invalid=5969, Unknown=0, NotChecked=0, Total=11130 [2018-10-27 09:18:02,708 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 54 states. [2018-10-27 09:18:02,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:02,848 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-10-27 09:18:02,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-27 09:18:02,848 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 158 [2018-10-27 09:18:02,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:02,849 INFO L225 Difference]: With dead ends: 168 [2018-10-27 09:18:02,849 INFO L226 Difference]: Without dead ends: 163 [2018-10-27 09:18:02,850 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 264 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5167, Invalid=6175, Unknown=0, NotChecked=0, Total=11342 [2018-10-27 09:18:02,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-27 09:18:02,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2018-10-27 09:18:02,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-27 09:18:02,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-10-27 09:18:02,853 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 158 [2018-10-27 09:18:02,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:02,853 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-10-27 09:18:02,853 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 09:18:02,853 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-10-27 09:18:02,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-27 09:18:02,854 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:02,854 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:02,854 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:02,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:02,855 INFO L82 PathProgramCache]: Analyzing trace with hash -185308931, now seen corresponding path program 50 times [2018-10-27 09:18:02,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:02,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:02,855 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:18:02,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:02,855 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:02,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:03,954 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:03,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:03,955 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:03,955 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:03,955 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:03,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:03,955 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:03,964 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:18:03,964 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:18:04,078 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2018-10-27 09:18:04,078 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:18:04,081 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:04,152 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:04,153 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:06,981 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:07,001 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:07,001 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 108 [2018-10-27 09:18:07,001 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:07,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-27 09:18:07,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-27 09:18:07,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5366, Invalid=6190, Unknown=0, NotChecked=0, Total=11556 [2018-10-27 09:18:07,003 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 55 states. [2018-10-27 09:18:07,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:07,125 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-10-27 09:18:07,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 09:18:07,125 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 161 [2018-10-27 09:18:07,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:07,126 INFO L225 Difference]: With dead ends: 171 [2018-10-27 09:18:07,126 INFO L226 Difference]: Without dead ends: 166 [2018-10-27 09:18:07,127 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 269 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5372, Invalid=6400, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 09:18:07,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-27 09:18:07,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-10-27 09:18:07,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-27 09:18:07,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2018-10-27 09:18:07,131 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 161 [2018-10-27 09:18:07,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:07,131 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2018-10-27 09:18:07,132 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-27 09:18:07,132 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2018-10-27 09:18:07,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-27 09:18:07,132 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:07,132 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:07,132 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:07,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:07,133 INFO L82 PathProgramCache]: Analyzing trace with hash -866128259, now seen corresponding path program 51 times [2018-10-27 09:18:07,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:07,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:07,133 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:18:07,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:07,133 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:07,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:08,315 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:08,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:08,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:08,316 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:08,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:08,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:08,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:08,324 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:18:08,324 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:18:08,413 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:18:08,413 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:18:08,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:08,498 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:08,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:11,438 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:11,471 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:11,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-27 09:18:11,472 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:11,472 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-27 09:18:11,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-27 09:18:11,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5575, Invalid=6415, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 09:18:11,473 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 56 states. [2018-10-27 09:18:11,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:11,630 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-10-27 09:18:11,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-27 09:18:11,630 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 164 [2018-10-27 09:18:11,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:11,631 INFO L225 Difference]: With dead ends: 174 [2018-10-27 09:18:11,631 INFO L226 Difference]: Without dead ends: 169 [2018-10-27 09:18:11,631 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 274 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5581, Invalid=6629, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 09:18:11,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-27 09:18:11,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2018-10-27 09:18:11,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-27 09:18:11,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-10-27 09:18:11,635 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 164 [2018-10-27 09:18:11,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:11,635 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-10-27 09:18:11,635 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-27 09:18:11,635 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-10-27 09:18:11,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-27 09:18:11,636 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:11,636 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:11,636 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:11,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:11,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1975810301, now seen corresponding path program 52 times [2018-10-27 09:18:11,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:11,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:11,637 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:18:11,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:11,637 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:11,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:12,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:12,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:12,980 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:12,980 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:12,980 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:12,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:12,980 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:12,989 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:18:12,989 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:18:13,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:13,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:13,174 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:13,174 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:16,398 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:16,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:16,418 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 112 [2018-10-27 09:18:16,418 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:16,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 09:18:16,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 09:18:16,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5788, Invalid=6644, Unknown=0, NotChecked=0, Total=12432 [2018-10-27 09:18:16,420 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 57 states. [2018-10-27 09:18:16,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:16,532 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-10-27 09:18:16,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-27 09:18:16,532 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 167 [2018-10-27 09:18:16,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:16,534 INFO L225 Difference]: With dead ends: 177 [2018-10-27 09:18:16,534 INFO L226 Difference]: Without dead ends: 172 [2018-10-27 09:18:16,535 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 279 SyntacticMatches, 1 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5794, Invalid=6862, Unknown=0, NotChecked=0, Total=12656 [2018-10-27 09:18:16,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-27 09:18:16,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-27 09:18:16,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-27 09:18:16,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-10-27 09:18:16,538 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 167 [2018-10-27 09:18:16,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:16,538 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-10-27 09:18:16,538 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 09:18:16,538 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-10-27 09:18:16,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-27 09:18:16,539 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:16,539 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:16,539 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:16,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:16,539 INFO L82 PathProgramCache]: Analyzing trace with hash -522854787, now seen corresponding path program 53 times [2018-10-27 09:18:16,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:16,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:16,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:18:16,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:16,540 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:16,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:17,698 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:17,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:17,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:17,698 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:17,699 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:17,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:17,699 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:17,706 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:18:17,707 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:18:17,829 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-10-27 09:18:17,829 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:18:17,833 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:18,538 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:18,538 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:21,740 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:21,760 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:21,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 114 [2018-10-27 09:18:21,760 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:21,761 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-27 09:18:21,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-27 09:18:21,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6005, Invalid=6877, Unknown=0, NotChecked=0, Total=12882 [2018-10-27 09:18:21,762 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 58 states. [2018-10-27 09:18:21,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:21,930 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-10-27 09:18:21,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-27 09:18:21,930 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 170 [2018-10-27 09:18:21,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:21,931 INFO L225 Difference]: With dead ends: 180 [2018-10-27 09:18:21,931 INFO L226 Difference]: Without dead ends: 175 [2018-10-27 09:18:21,932 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 284 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6011, Invalid=7099, Unknown=0, NotChecked=0, Total=13110 [2018-10-27 09:18:21,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-27 09:18:21,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2018-10-27 09:18:21,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-27 09:18:21,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-10-27 09:18:21,939 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 170 [2018-10-27 09:18:21,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:21,939 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-10-27 09:18:21,939 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-27 09:18:21,939 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-10-27 09:18:21,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-27 09:18:21,940 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:21,940 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:21,940 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:21,940 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:21,941 INFO L82 PathProgramCache]: Analyzing trace with hash 2118682877, now seen corresponding path program 54 times [2018-10-27 09:18:21,941 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:21,941 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:21,941 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:18:21,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:21,942 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:21,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:23,214 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:23,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:23,214 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:23,214 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:23,214 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:23,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:23,214 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:23,222 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:18:23,222 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:18:23,305 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:18:23,305 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:18:23,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:23,381 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:23,382 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:26,662 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:26,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:26,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-27 09:18:26,682 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:26,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-27 09:18:26,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-27 09:18:26,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6226, Invalid=7114, Unknown=0, NotChecked=0, Total=13340 [2018-10-27 09:18:26,684 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 59 states. [2018-10-27 09:18:26,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:26,806 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-10-27 09:18:26,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-27 09:18:26,807 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 173 [2018-10-27 09:18:26,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:26,808 INFO L225 Difference]: With dead ends: 183 [2018-10-27 09:18:26,808 INFO L226 Difference]: Without dead ends: 178 [2018-10-27 09:18:26,809 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 289 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6232, Invalid=7340, Unknown=0, NotChecked=0, Total=13572 [2018-10-27 09:18:26,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-27 09:18:26,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-10-27 09:18:26,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-27 09:18:26,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2018-10-27 09:18:26,813 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 173 [2018-10-27 09:18:26,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:26,813 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2018-10-27 09:18:26,813 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-27 09:18:26,813 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2018-10-27 09:18:26,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-27 09:18:26,814 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:26,815 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:26,815 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:26,815 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:26,815 INFO L82 PathProgramCache]: Analyzing trace with hash -518533507, now seen corresponding path program 55 times [2018-10-27 09:18:26,815 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:26,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:26,816 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:18:26,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:26,816 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:26,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:28,138 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:28,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:28,139 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:28,139 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:28,139 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:28,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:28,139 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:28,146 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:18:28,146 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:18:28,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:28,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:28,308 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:28,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:31,649 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:31,683 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:31,684 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-10-27 09:18:31,684 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:31,684 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-27 09:18:31,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-27 09:18:31,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6451, Invalid=7355, Unknown=0, NotChecked=0, Total=13806 [2018-10-27 09:18:31,685 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 60 states. [2018-10-27 09:18:31,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:31,872 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-10-27 09:18:31,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-27 09:18:31,872 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 176 [2018-10-27 09:18:31,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:31,873 INFO L225 Difference]: With dead ends: 186 [2018-10-27 09:18:31,874 INFO L226 Difference]: Without dead ends: 181 [2018-10-27 09:18:31,874 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 294 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6457, Invalid=7585, Unknown=0, NotChecked=0, Total=14042 [2018-10-27 09:18:31,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-27 09:18:31,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2018-10-27 09:18:31,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-27 09:18:31,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-10-27 09:18:31,879 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 176 [2018-10-27 09:18:31,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:31,879 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-10-27 09:18:31,879 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-27 09:18:31,879 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-10-27 09:18:31,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-27 09:18:31,880 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:31,880 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:31,881 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:31,881 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:31,881 INFO L82 PathProgramCache]: Analyzing trace with hash 2004916477, now seen corresponding path program 56 times [2018-10-27 09:18:31,881 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:31,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:31,882 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:18:31,882 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:31,882 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:31,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:33,156 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:33,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:33,156 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:33,157 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:33,157 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:33,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:33,157 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:33,168 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:18:33,169 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:18:33,297 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2018-10-27 09:18:33,297 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:18:33,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:33,436 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:33,436 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:36,962 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:36,982 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:36,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 120 [2018-10-27 09:18:36,983 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:36,983 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-27 09:18:36,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-27 09:18:36,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6680, Invalid=7600, Unknown=0, NotChecked=0, Total=14280 [2018-10-27 09:18:36,984 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 61 states. [2018-10-27 09:18:37,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:37,166 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-10-27 09:18:37,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-27 09:18:37,166 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 179 [2018-10-27 09:18:37,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:37,167 INFO L225 Difference]: With dead ends: 189 [2018-10-27 09:18:37,168 INFO L226 Difference]: Without dead ends: 184 [2018-10-27 09:18:37,168 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 299 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 451 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=6686, Invalid=7834, Unknown=0, NotChecked=0, Total=14520 [2018-10-27 09:18:37,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-27 09:18:37,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-10-27 09:18:37,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-27 09:18:37,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-10-27 09:18:37,173 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 179 [2018-10-27 09:18:37,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:37,173 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-10-27 09:18:37,173 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-27 09:18:37,173 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-10-27 09:18:37,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-27 09:18:37,174 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:37,174 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:37,175 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:37,175 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:37,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1004159363, now seen corresponding path program 57 times [2018-10-27 09:18:37,175 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:37,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:37,176 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:18:37,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:37,176 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:37,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:38,943 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:38,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:38,943 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:38,943 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:38,944 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:38,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:38,944 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:38,951 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:18:38,951 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:18:39,034 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:18:39,034 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:18:39,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:39,121 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:39,121 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:42,779 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:42,799 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:42,799 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-27 09:18:42,800 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:42,800 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-27 09:18:42,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-27 09:18:42,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6913, Invalid=7849, Unknown=0, NotChecked=0, Total=14762 [2018-10-27 09:18:42,801 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 62 states. [2018-10-27 09:18:42,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:42,960 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-10-27 09:18:42,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-27 09:18:42,960 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 182 [2018-10-27 09:18:42,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:42,961 INFO L225 Difference]: With dead ends: 192 [2018-10-27 09:18:42,961 INFO L226 Difference]: Without dead ends: 187 [2018-10-27 09:18:42,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 304 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=6919, Invalid=8087, Unknown=0, NotChecked=0, Total=15006 [2018-10-27 09:18:42,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-27 09:18:42,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-27 09:18:42,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-27 09:18:42,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-10-27 09:18:42,965 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 182 [2018-10-27 09:18:42,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:42,966 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-10-27 09:18:42,966 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-27 09:18:42,966 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-10-27 09:18:42,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-27 09:18:42,967 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:42,967 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:42,967 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:42,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:42,967 INFO L82 PathProgramCache]: Analyzing trace with hash 174893309, now seen corresponding path program 58 times [2018-10-27 09:18:42,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:42,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:42,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:18:42,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:42,968 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:43,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:44,397 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:44,397 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:44,398 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:44,398 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:44,398 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:44,398 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:44,398 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:44,408 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:18:44,408 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:18:44,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:44,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:44,575 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:44,576 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:48,274 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:48,294 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:48,294 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 124 [2018-10-27 09:18:48,294 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:48,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-27 09:18:48,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-27 09:18:48,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7150, Invalid=8102, Unknown=0, NotChecked=0, Total=15252 [2018-10-27 09:18:48,296 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 63 states. [2018-10-27 09:18:48,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:48,478 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-10-27 09:18:48,479 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-27 09:18:48,479 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 185 [2018-10-27 09:18:48,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:48,480 INFO L225 Difference]: With dead ends: 195 [2018-10-27 09:18:48,480 INFO L226 Difference]: Without dead ends: 190 [2018-10-27 09:18:48,480 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 309 SyntacticMatches, 1 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=7156, Invalid=8344, Unknown=0, NotChecked=0, Total=15500 [2018-10-27 09:18:48,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-10-27 09:18:48,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-10-27 09:18:48,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-27 09:18:48,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2018-10-27 09:18:48,484 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 185 [2018-10-27 09:18:48,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:48,484 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2018-10-27 09:18:48,484 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-27 09:18:48,484 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2018-10-27 09:18:48,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-10-27 09:18:48,485 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:48,485 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:48,485 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:48,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:48,485 INFO L82 PathProgramCache]: Analyzing trace with hash 1090498173, now seen corresponding path program 59 times [2018-10-27 09:18:48,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:48,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:48,486 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:18:48,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:48,486 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:48,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:49,977 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:49,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:49,978 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:49,978 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:49,978 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:49,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:49,978 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:49,986 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:18:49,986 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:18:50,125 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2018-10-27 09:18:50,125 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:18:50,129 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:50,201 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:50,201 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:54,017 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:54,037 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:54,037 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 126 [2018-10-27 09:18:54,038 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:54,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-27 09:18:54,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-27 09:18:54,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7391, Invalid=8359, Unknown=0, NotChecked=0, Total=15750 [2018-10-27 09:18:54,039 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 64 states. [2018-10-27 09:18:54,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:54,212 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-10-27 09:18:54,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-27 09:18:54,213 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 188 [2018-10-27 09:18:54,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:54,214 INFO L225 Difference]: With dead ends: 198 [2018-10-27 09:18:54,214 INFO L226 Difference]: Without dead ends: 193 [2018-10-27 09:18:54,215 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 314 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=7397, Invalid=8605, Unknown=0, NotChecked=0, Total=16002 [2018-10-27 09:18:54,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-27 09:18:54,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-27 09:18:54,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-27 09:18:54,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-10-27 09:18:54,218 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 188 [2018-10-27 09:18:54,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:18:54,218 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-10-27 09:18:54,218 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-27 09:18:54,218 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-10-27 09:18:54,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-27 09:18:54,219 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:18:54,219 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:18:54,219 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:18:54,220 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:18:54,220 INFO L82 PathProgramCache]: Analyzing trace with hash 537704701, now seen corresponding path program 60 times [2018-10-27 09:18:54,220 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:18:54,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:54,220 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:18:54,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:18:54,221 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:18:54,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:18:55,639 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:55,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:55,640 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:18:55,640 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:18:55,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:18:55,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:18:55,640 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:18:55,647 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:18:55,647 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:18:55,740 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:18:55,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:18:55,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:18:55,834 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:55,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:18:59,818 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:18:59,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:18:59,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-27 09:18:59,838 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:18:59,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-27 09:18:59,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-27 09:18:59,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7636, Invalid=8620, Unknown=0, NotChecked=0, Total=16256 [2018-10-27 09:18:59,840 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 65 states. [2018-10-27 09:18:59,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:18:59,991 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-10-27 09:18:59,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-27 09:18:59,992 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 191 [2018-10-27 09:18:59,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:18:59,993 INFO L225 Difference]: With dead ends: 201 [2018-10-27 09:18:59,994 INFO L226 Difference]: Without dead ends: 196 [2018-10-27 09:18:59,995 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 319 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=7642, Invalid=8870, Unknown=0, NotChecked=0, Total=16512 [2018-10-27 09:18:59,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-27 09:18:59,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-27 09:18:59,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-27 09:18:59,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-10-27 09:18:59,999 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 191 [2018-10-27 09:19:00,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:00,006 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-10-27 09:19:00,006 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-27 09:19:00,006 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-10-27 09:19:00,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-27 09:19:00,007 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:00,007 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:00,008 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:00,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:00,008 INFO L82 PathProgramCache]: Analyzing trace with hash -828006787, now seen corresponding path program 61 times [2018-10-27 09:19:00,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:00,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:00,009 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:19:00,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:00,009 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:00,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:02,263 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:02,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:02,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:02,263 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:02,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:02,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:02,264 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:02,270 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:19:02,271 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:19:02,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:02,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:02,443 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:02,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:06,541 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:06,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:06,562 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 130 [2018-10-27 09:19:06,562 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:06,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-27 09:19:06,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-27 09:19:06,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7885, Invalid=8885, Unknown=0, NotChecked=0, Total=16770 [2018-10-27 09:19:06,563 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 66 states. [2018-10-27 09:19:06,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:19:06,745 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-10-27 09:19:06,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-27 09:19:06,745 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 194 [2018-10-27 09:19:06,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:19:06,747 INFO L225 Difference]: With dead ends: 204 [2018-10-27 09:19:06,747 INFO L226 Difference]: Without dead ends: 199 [2018-10-27 09:19:06,748 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 454 GetRequests, 324 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=7891, Invalid=9139, Unknown=0, NotChecked=0, Total=17030 [2018-10-27 09:19:06,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-27 09:19:06,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-27 09:19:06,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-27 09:19:06,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-10-27 09:19:06,752 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 194 [2018-10-27 09:19:06,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:06,752 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-10-27 09:19:06,752 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-27 09:19:06,753 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-10-27 09:19:06,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-27 09:19:06,754 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:06,754 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:06,754 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:06,754 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:06,754 INFO L82 PathProgramCache]: Analyzing trace with hash -513750787, now seen corresponding path program 62 times [2018-10-27 09:19:06,754 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:06,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:06,755 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:19:06,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:06,755 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:06,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:08,235 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:08,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:08,236 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:08,236 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:08,236 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:08,236 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:08,236 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:08,244 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:19:08,244 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:19:08,394 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2018-10-27 09:19:08,395 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:19:08,398 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:08,481 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:08,481 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:12,751 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:12,771 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:12,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 132 [2018-10-27 09:19:12,772 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:12,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-27 09:19:12,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-27 09:19:12,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8138, Invalid=9154, Unknown=0, NotChecked=0, Total=17292 [2018-10-27 09:19:12,773 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 67 states. [2018-10-27 09:19:12,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:19:12,971 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-10-27 09:19:12,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-27 09:19:12,971 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 197 [2018-10-27 09:19:12,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:19:12,972 INFO L225 Difference]: With dead ends: 207 [2018-10-27 09:19:12,972 INFO L226 Difference]: Without dead ends: 202 [2018-10-27 09:19:12,973 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 329 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2018-10-27 09:19:12,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-27 09:19:12,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-10-27 09:19:12,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-27 09:19:12,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2018-10-27 09:19:12,977 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 197 [2018-10-27 09:19:12,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:12,977 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2018-10-27 09:19:12,977 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-27 09:19:12,977 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2018-10-27 09:19:12,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-27 09:19:12,978 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:12,979 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:12,979 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:12,979 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:12,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1541960067, now seen corresponding path program 63 times [2018-10-27 09:19:12,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:12,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:12,980 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:19:12,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:12,980 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:13,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:14,540 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:14,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:14,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:14,541 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:14,541 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:14,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:14,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:14,548 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:19:14,549 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:19:14,663 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:19:14,663 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:19:14,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:14,736 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:14,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:19,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:19,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:19,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-27 09:19:19,137 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:19,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-27 09:19:19,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-27 09:19:19,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8395, Invalid=9427, Unknown=0, NotChecked=0, Total=17822 [2018-10-27 09:19:19,139 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 68 states. [2018-10-27 09:19:19,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:19:19,296 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-10-27 09:19:19,296 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-27 09:19:19,296 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 200 [2018-10-27 09:19:19,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:19:19,297 INFO L225 Difference]: With dead ends: 210 [2018-10-27 09:19:19,297 INFO L226 Difference]: Without dead ends: 205 [2018-10-27 09:19:19,298 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=8401, Invalid=9689, Unknown=0, NotChecked=0, Total=18090 [2018-10-27 09:19:19,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-27 09:19:19,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-10-27 09:19:19,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-27 09:19:19,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2018-10-27 09:19:19,302 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 200 [2018-10-27 09:19:19,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:19,302 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2018-10-27 09:19:19,302 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-27 09:19:19,302 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2018-10-27 09:19:19,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-27 09:19:19,303 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:19,303 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:19,304 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:19,304 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:19,304 INFO L82 PathProgramCache]: Analyzing trace with hash -1217865475, now seen corresponding path program 64 times [2018-10-27 09:19:19,304 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:19,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:19,305 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:19:19,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:19,305 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:19,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:20,919 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:20,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:20,919 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:20,919 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:20,919 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:20,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:20,919 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:20,927 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:19:20,927 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:19:21,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:21,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:21,107 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:21,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:25,572 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:25,592 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:25,592 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 136 [2018-10-27 09:19:25,592 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:25,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-27 09:19:25,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-27 09:19:25,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8656, Invalid=9704, Unknown=0, NotChecked=0, Total=18360 [2018-10-27 09:19:25,594 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 69 states. [2018-10-27 09:19:25,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:19:25,789 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-10-27 09:19:25,789 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-27 09:19:25,789 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 203 [2018-10-27 09:19:25,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:19:25,791 INFO L225 Difference]: With dead ends: 213 [2018-10-27 09:19:25,791 INFO L226 Difference]: Without dead ends: 208 [2018-10-27 09:19:25,792 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 339 SyntacticMatches, 1 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=8662, Invalid=9970, Unknown=0, NotChecked=0, Total=18632 [2018-10-27 09:19:25,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-27 09:19:25,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-10-27 09:19:25,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-27 09:19:25,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-10-27 09:19:25,795 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 203 [2018-10-27 09:19:25,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:25,795 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-10-27 09:19:25,795 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-27 09:19:25,796 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-10-27 09:19:25,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-27 09:19:25,797 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:25,797 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:25,797 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:25,797 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:25,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1202356611, now seen corresponding path program 65 times [2018-10-27 09:19:25,797 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:25,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:25,798 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:19:25,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:25,798 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:25,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:27,438 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:27,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:27,438 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:27,438 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:27,438 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:27,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:27,439 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:27,448 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:19:27,449 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:19:27,610 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2018-10-27 09:19:27,610 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:19:27,614 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:27,689 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:27,689 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:32,327 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:32,347 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:32,347 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 138 [2018-10-27 09:19:32,347 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:32,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-27 09:19:32,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-27 09:19:32,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8921, Invalid=9985, Unknown=0, NotChecked=0, Total=18906 [2018-10-27 09:19:32,349 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 70 states. [2018-10-27 09:19:32,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:19:32,541 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-10-27 09:19:32,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-27 09:19:32,541 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 206 [2018-10-27 09:19:32,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:19:32,543 INFO L225 Difference]: With dead ends: 216 [2018-10-27 09:19:32,543 INFO L226 Difference]: Without dead ends: 211 [2018-10-27 09:19:32,544 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 344 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=8927, Invalid=10255, Unknown=0, NotChecked=0, Total=19182 [2018-10-27 09:19:32,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-27 09:19:32,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-10-27 09:19:32,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-27 09:19:32,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 210 transitions. [2018-10-27 09:19:32,547 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 210 transitions. Word has length 206 [2018-10-27 09:19:32,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:32,547 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 210 transitions. [2018-10-27 09:19:32,547 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-27 09:19:32,547 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 210 transitions. [2018-10-27 09:19:32,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-27 09:19:32,548 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:32,548 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:32,548 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:32,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:32,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1260710141, now seen corresponding path program 66 times [2018-10-27 09:19:32,548 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:32,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:32,549 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:19:32,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:32,549 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:32,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:34,224 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:34,225 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:34,225 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:34,225 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:34,225 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:34,225 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:34,225 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:34,233 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:19:34,233 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:19:34,334 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:19:34,334 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:19:34,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:34,420 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:34,421 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:39,203 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:39,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:39,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-27 09:19:39,224 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:39,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-27 09:19:39,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-27 09:19:39,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9190, Invalid=10270, Unknown=0, NotChecked=0, Total=19460 [2018-10-27 09:19:39,225 INFO L87 Difference]: Start difference. First operand 210 states and 210 transitions. Second operand 71 states. [2018-10-27 09:19:39,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:19:39,381 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-10-27 09:19:39,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-27 09:19:39,381 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 209 [2018-10-27 09:19:39,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:19:39,382 INFO L225 Difference]: With dead ends: 219 [2018-10-27 09:19:39,382 INFO L226 Difference]: Without dead ends: 214 [2018-10-27 09:19:39,383 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 349 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=9196, Invalid=10544, Unknown=0, NotChecked=0, Total=19740 [2018-10-27 09:19:39,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-27 09:19:39,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-27 09:19:39,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-27 09:19:39,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 213 transitions. [2018-10-27 09:19:39,386 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 213 transitions. Word has length 209 [2018-10-27 09:19:39,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:39,387 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 213 transitions. [2018-10-27 09:19:39,387 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-27 09:19:39,387 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 213 transitions. [2018-10-27 09:19:39,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-27 09:19:39,388 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:39,388 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:39,388 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:39,389 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:39,389 INFO L82 PathProgramCache]: Analyzing trace with hash -1033933187, now seen corresponding path program 67 times [2018-10-27 09:19:39,389 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:39,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:39,389 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:19:39,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:39,390 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:39,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:41,170 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:41,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:41,171 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:41,171 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:41,171 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:41,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:41,171 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:41,179 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:19:41,179 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:19:41,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:41,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:41,364 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:41,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:46,358 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:46,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:46,379 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 142 [2018-10-27 09:19:46,379 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:46,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-27 09:19:46,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-27 09:19:46,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9463, Invalid=10559, Unknown=0, NotChecked=0, Total=20022 [2018-10-27 09:19:46,380 INFO L87 Difference]: Start difference. First operand 213 states and 213 transitions. Second operand 72 states. [2018-10-27 09:19:46,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:19:46,605 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2018-10-27 09:19:46,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-27 09:19:46,605 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 212 [2018-10-27 09:19:46,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:19:46,606 INFO L225 Difference]: With dead ends: 222 [2018-10-27 09:19:46,606 INFO L226 Difference]: Without dead ends: 217 [2018-10-27 09:19:46,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 354 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=9469, Invalid=10837, Unknown=0, NotChecked=0, Total=20306 [2018-10-27 09:19:46,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-27 09:19:46,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 216. [2018-10-27 09:19:46,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-10-27 09:19:46,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 216 transitions. [2018-10-27 09:19:46,611 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 216 transitions. Word has length 212 [2018-10-27 09:19:46,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:46,612 INFO L481 AbstractCegarLoop]: Abstraction has 216 states and 216 transitions. [2018-10-27 09:19:46,612 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-27 09:19:46,612 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 216 transitions. [2018-10-27 09:19:46,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-27 09:19:46,613 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:46,613 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:46,613 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:46,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:46,614 INFO L82 PathProgramCache]: Analyzing trace with hash -2053834499, now seen corresponding path program 68 times [2018-10-27 09:19:46,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:46,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:46,614 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:19:46,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:46,615 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:46,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:48,405 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:48,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:48,406 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:48,406 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:48,406 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:48,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:48,406 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:48,413 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:19:48,413 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:19:48,584 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-10-27 09:19:48,584 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:19:48,588 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:48,671 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:48,671 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:19:53,747 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:53,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:19:53,769 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 144 [2018-10-27 09:19:53,769 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:19:53,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-27 09:19:53,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-27 09:19:53,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9740, Invalid=10852, Unknown=0, NotChecked=0, Total=20592 [2018-10-27 09:19:53,770 INFO L87 Difference]: Start difference. First operand 216 states and 216 transitions. Second operand 73 states. [2018-10-27 09:19:53,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:19:53,968 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2018-10-27 09:19:53,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-27 09:19:53,968 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 215 [2018-10-27 09:19:53,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:19:53,969 INFO L225 Difference]: With dead ends: 225 [2018-10-27 09:19:53,969 INFO L226 Difference]: Without dead ends: 220 [2018-10-27 09:19:53,970 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 359 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=9746, Invalid=11134, Unknown=0, NotChecked=0, Total=20880 [2018-10-27 09:19:53,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-27 09:19:53,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 219. [2018-10-27 09:19:53,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-27 09:19:53,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 219 transitions. [2018-10-27 09:19:53,973 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 219 transitions. Word has length 215 [2018-10-27 09:19:53,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:19:53,974 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 219 transitions. [2018-10-27 09:19:53,974 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-27 09:19:53,974 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 219 transitions. [2018-10-27 09:19:53,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-10-27 09:19:53,974 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:19:53,975 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:19:53,975 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:19:53,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:19:53,975 INFO L82 PathProgramCache]: Analyzing trace with hash 959798909, now seen corresponding path program 69 times [2018-10-27 09:19:53,975 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:19:53,975 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:53,976 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:19:53,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:19:53,976 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:19:54,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:19:55,809 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:55,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:55,810 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:19:55,810 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:19:55,810 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:19:55,810 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:19:55,810 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:19:55,818 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:19:55,818 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:19:55,929 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:19:55,929 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:19:55,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:19:56,010 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:19:56,010 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:20:01,177 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:20:01,197 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:20:01,197 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-10-27 09:20:01,197 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:20:01,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-10-27 09:20:01,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-10-27 09:20:01,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10021, Invalid=11149, Unknown=0, NotChecked=0, Total=21170 [2018-10-27 09:20:01,199 INFO L87 Difference]: Start difference. First operand 219 states and 219 transitions. Second operand 74 states. [2018-10-27 09:20:01,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:20:01,423 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2018-10-27 09:20:01,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-10-27 09:20:01,423 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 218 [2018-10-27 09:20:01,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:20:01,424 INFO L225 Difference]: With dead ends: 228 [2018-10-27 09:20:01,424 INFO L226 Difference]: Without dead ends: 223 [2018-10-27 09:20:01,425 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 364 SyntacticMatches, 1 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=10027, Invalid=11435, Unknown=0, NotChecked=0, Total=21462 [2018-10-27 09:20:01,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-27 09:20:01,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2018-10-27 09:20:01,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-27 09:20:01,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 222 transitions. [2018-10-27 09:20:01,428 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 222 transitions. Word has length 218 [2018-10-27 09:20:01,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:20:01,428 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 222 transitions. [2018-10-27 09:20:01,428 INFO L482 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-10-27 09:20:01,428 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 222 transitions. [2018-10-27 09:20:01,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-27 09:20:01,429 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:20:01,429 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:20:01,429 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:20:01,429 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:20:01,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1883698947, now seen corresponding path program 70 times [2018-10-27 09:20:01,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:20:01,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:20:01,430 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:20:01,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:20:01,431 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:20:01,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:20:03,327 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:20:03,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:20:03,328 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:20:03,328 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:20:03,328 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:20:03,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:20:03,328 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:20:03,336 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:20:03,336 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:20:03,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:20:03,446 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:20:03,523 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:20:03,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-27 09:20:06,710 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-27 09:20:06,911 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:20:06,912 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 09:20:06,917 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 09:20:06,918 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 09:20:06 BoogieIcfgContainer [2018-10-27 09:20:06,918 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 09:20:06,918 INFO L168 Benchmark]: Toolchain (without parser) took 232446.99 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 890.2 MB). Free memory was 1.4 GB in the beginning and 1.9 GB in the end (delta: -464.9 MB). Peak memory consumption was 425.4 MB. Max. memory is 7.1 GB. [2018-10-27 09:20:06,920 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:20:06,920 INFO L168 Benchmark]: CACSL2BoogieTranslator took 260.11 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 09:20:06,921 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.64 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:20:06,921 INFO L168 Benchmark]: Boogie Preprocessor took 27.90 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 09:20:06,921 INFO L168 Benchmark]: RCFGBuilder took 373.56 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 736.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -786.0 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-27 09:20:06,922 INFO L168 Benchmark]: TraceAbstraction took 231757.00 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 154.1 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 310.5 MB). Peak memory consumption was 464.7 MB. Max. memory is 7.1 GB. [2018-10-27 09:20:06,924 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 260.11 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 23.64 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 27.90 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 373.56 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 736.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -786.0 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 231757.00 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 154.1 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 310.5 MB). Peak memory consumption was 464.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 222 with TraceHistMax 71,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 124 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 231.6s OverallTime, 72 OverallIterations, 71 TraceHistogramMax, 10.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 791 SDtfs, 2553 SDslu, 19636 SDs, 0 SdLazy, 4698 SolverSat, 111 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18770 GetRequests, 13393 SyntacticMatches, 70 SemanticMatches, 5307 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19517 ImplicationChecksByTransitivity, 201.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=222occurred in iteration=71, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 71 MinimizatonAttempts, 69 StatesRemovedByMinimization, 69 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.7s SsaConstructionTime, 5.6s SatisfiabilityAnalysisTime, 205.6s InterpolantComputationTime, 16029 NumberOfCodeBlocks, 16029 NumberOfCodeBlocksAsserted, 968 NumberOfCheckSat, 23824 ConstructedInterpolants, 0 QuantifiedInterpolants, 10207476 SizeOfPredicates, 139 NumberOfNonLiveVariables, 30705 ConjunctsInSsa, 2894 ConjunctsInUnsatCore, 209 InterpolantComputations, 2 PerfectInterpolantSequences, 0/507150 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown