java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 15:41:01,854 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 15:41:01,856 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 15:41:01,874 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 15:41:01,874 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 15:41:01,875 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 15:41:01,877 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 15:41:01,879 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 15:41:01,889 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 15:41:01,891 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 15:41:01,892 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 15:41:01,892 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 15:41:01,894 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 15:41:01,895 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 15:41:01,898 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 15:41:01,905 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 15:41:01,905 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 15:41:01,907 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 15:41:01,909 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 15:41:01,911 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 15:41:01,912 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 15:41:01,913 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 15:41:01,915 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 15:41:01,915 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 15:41:01,915 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 15:41:01,916 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 15:41:01,917 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 15:41:01,917 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 15:41:01,918 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 15:41:01,919 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 15:41:01,919 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 15:41:01,920 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 15:41:01,920 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 15:41:01,921 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 15:41:01,922 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 15:41:01,923 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 15:41:01,923 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-10-27 15:41:01,950 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 15:41:01,950 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 15:41:01,951 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 15:41:01,952 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 15:41:01,952 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 15:41:01,952 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 15:41:01,952 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 15:41:01,952 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 15:41:01,952 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 15:41:01,953 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 15:41:01,953 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 15:41:01,953 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 15:41:01,954 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 15:41:01,954 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 15:41:01,954 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 15:41:01,954 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 15:41:01,954 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 15:41:01,955 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 15:41:01,955 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 15:41:01,955 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 15:41:01,955 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 15:41:01,955 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 15:41:01,956 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 15:41:01,956 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 15:41:01,956 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:41:01,956 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 15:41:01,956 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 15:41:01,956 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 15:41:01,957 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 15:41:01,957 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 15:41:01,957 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 15:41:01,957 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 15:41:01,957 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 15:41:01,958 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 15:41:02,019 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 15:41:02,031 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 15:41:02,035 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 15:41:02,036 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 15:41:02,037 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 15:41:02,037 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i [2018-10-27 15:41:02,096 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/70617c839/57975802c72f40119ccb12af490d68c1/FLAGf0a13132b [2018-10-27 15:41:02,532 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 15:41:02,533 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_2_true-unreach-call_true-termination.i [2018-10-27 15:41:02,540 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/70617c839/57975802c72f40119ccb12af490d68c1/FLAGf0a13132b [2018-10-27 15:41:02,554 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/70617c839/57975802c72f40119ccb12af490d68c1 [2018-10-27 15:41:02,565 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 15:41:02,566 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 15:41:02,567 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 15:41:02,567 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 15:41:02,572 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 15:41:02,573 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,576 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3880cdf7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02, skipping insertion in model container [2018-10-27 15:41:02,576 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,587 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 15:41:02,613 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 15:41:02,828 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:41:02,832 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 15:41:02,845 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:41:02,861 INFO L193 MainTranslator]: Completed translation [2018-10-27 15:41:02,861 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02 WrapperNode [2018-10-27 15:41:02,862 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 15:41:02,862 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 15:41:02,863 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 15:41:02,863 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 15:41:02,870 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,875 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,881 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 15:41:02,881 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 15:41:02,881 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 15:41:02,881 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 15:41:02,890 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,891 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,891 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,891 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,894 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,899 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,900 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (1/1) ... [2018-10-27 15:41:02,902 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 15:41:02,902 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 15:41:02,902 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 15:41:02,903 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 15:41:02,903 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:41:02,956 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 15:41:02,957 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 15:41:02,957 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 15:41:02,957 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 15:41:02,957 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 15:41:02,957 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 15:41:02,958 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 15:41:02,958 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 15:41:03,221 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 15:41:03,222 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:41:03 BoogieIcfgContainer [2018-10-27 15:41:03,222 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 15:41:03,223 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 15:41:03,223 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 15:41:03,226 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 15:41:03,226 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 03:41:02" (1/3) ... [2018-10-27 15:41:03,227 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5094a810 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:41:03, skipping insertion in model container [2018-10-27 15:41:03,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:41:02" (2/3) ... [2018-10-27 15:41:03,228 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5094a810 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:41:03, skipping insertion in model container [2018-10-27 15:41:03,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:41:03" (3/3) ... [2018-10-27 15:41:03,230 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_2_true-unreach-call_true-termination.i [2018-10-27 15:41:03,240 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 15:41:03,248 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 15:41:03,265 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 15:41:03,296 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 15:41:03,297 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 15:41:03,297 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 15:41:03,297 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 15:41:03,297 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 15:41:03,297 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 15:41:03,298 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 15:41:03,298 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 15:41:03,317 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-27 15:41:03,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 15:41:03,323 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:03,324 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:03,327 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:03,333 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:03,334 INFO L82 PathProgramCache]: Analyzing trace with hash 563245249, now seen corresponding path program 1 times [2018-10-27 15:41:03,336 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:03,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:03,389 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:03,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:03,390 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:03,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:03,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:03,444 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:41:03,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 15:41:03,445 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:41:03,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 15:41:03,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 15:41:03,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:41:03,462 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-27 15:41:03,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:03,482 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2018-10-27 15:41:03,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 15:41:03,483 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 15:41:03,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:03,492 INFO L225 Difference]: With dead ends: 32 [2018-10-27 15:41:03,492 INFO L226 Difference]: Without dead ends: 13 [2018-10-27 15:41:03,495 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:41:03,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-27 15:41:03,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-27 15:41:03,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-27 15:41:03,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-27 15:41:03,530 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-27 15:41:03,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:03,531 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-27 15:41:03,531 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 15:41:03,531 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-27 15:41:03,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 15:41:03,532 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:03,533 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:03,533 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:03,533 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:03,534 INFO L82 PathProgramCache]: Analyzing trace with hash -496423, now seen corresponding path program 1 times [2018-10-27 15:41:03,534 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:03,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:03,535 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:03,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:03,536 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:03,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:03,584 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:03,585 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:41:03,585 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 15:41:03,585 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:41:03,587 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 15:41:03,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 15:41:03,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:41:03,589 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-10-27 15:41:03,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:03,668 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 15:41:03,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 15:41:03,669 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 15:41:03,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:03,670 INFO L225 Difference]: With dead ends: 21 [2018-10-27 15:41:03,671 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 15:41:03,672 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:41:03,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 15:41:03,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-27 15:41:03,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-27 15:41:03,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-27 15:41:03,676 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-10-27 15:41:03,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:03,677 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-27 15:41:03,677 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 15:41:03,677 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-27 15:41:03,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 15:41:03,678 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:03,678 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:03,678 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:03,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:03,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1177044387, now seen corresponding path program 1 times [2018-10-27 15:41:03,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:03,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:03,680 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:03,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:03,680 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:03,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:03,766 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:03,766 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:03,767 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:03,768 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-27 15:41:03,770 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [13], [15], [22], [25], [27], [33], [34], [35], [37] [2018-10-27 15:41:03,801 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:41:03,802 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:41:04,026 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:41:04,029 INFO L272 AbstractInterpreter]: Visited 13 different actions 40 times. Merged at 4 different actions 18 times. Widened at 1 different actions 2 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-27 15:41:04,072 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:04,074 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:41:04,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:04,074 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:04,100 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:04,101 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:04,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:04,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:04,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:04,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:04,251 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:04,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:04,273 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 15:41:04,273 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:04,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 15:41:04,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 15:41:04,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-27 15:41:04,274 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-10-27 15:41:04,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:04,315 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-27 15:41:04,315 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 15:41:04,315 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-27 15:41:04,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:04,317 INFO L225 Difference]: With dead ends: 24 [2018-10-27 15:41:04,317 INFO L226 Difference]: Without dead ends: 19 [2018-10-27 15:41:04,318 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-10-27 15:41:04,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-27 15:41:04,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-10-27 15:41:04,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 15:41:04,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-27 15:41:04,323 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-10-27 15:41:04,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:04,323 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-27 15:41:04,323 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 15:41:04,323 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-27 15:41:04,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 15:41:04,324 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:04,324 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:04,325 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:04,325 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:04,325 INFO L82 PathProgramCache]: Analyzing trace with hash -489337255, now seen corresponding path program 2 times [2018-10-27 15:41:04,326 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:04,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:04,327 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:04,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:04,327 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:04,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:04,384 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:04,385 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:04,385 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:04,386 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:04,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:04,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:04,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:04,395 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:04,395 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:04,432 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 15:41:04,432 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:04,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:04,442 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:04,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:04,630 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:04,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:04,660 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 15:41:04,660 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:04,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 15:41:04,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 15:41:04,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-27 15:41:04,662 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 5 states. [2018-10-27 15:41:04,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:04,818 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 15:41:04,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 15:41:04,819 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-10-27 15:41:04,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:04,820 INFO L225 Difference]: With dead ends: 27 [2018-10-27 15:41:04,820 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 15:41:04,820 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-10-27 15:41:04,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 15:41:04,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-27 15:41:04,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-27 15:41:04,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-27 15:41:04,825 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-10-27 15:41:04,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:04,826 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-27 15:41:04,826 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 15:41:04,826 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-27 15:41:04,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-27 15:41:04,827 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:04,827 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:04,828 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:04,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:04,828 INFO L82 PathProgramCache]: Analyzing trace with hash -169763, now seen corresponding path program 3 times [2018-10-27 15:41:04,828 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:04,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:04,830 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:04,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:04,830 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:04,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:04,936 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:04,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:04,937 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:04,937 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:04,937 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:04,937 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:04,937 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:04,948 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:04,949 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:04,967 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:04,968 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:04,970 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:04,980 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:04,980 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:05,088 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:05,109 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:05,109 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 15:41:05,109 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:05,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 15:41:05,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 15:41:05,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-27 15:41:05,111 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 6 states. [2018-10-27 15:41:05,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:05,173 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-27 15:41:05,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 15:41:05,174 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-10-27 15:41:05,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:05,175 INFO L225 Difference]: With dead ends: 30 [2018-10-27 15:41:05,175 INFO L226 Difference]: Without dead ends: 25 [2018-10-27 15:41:05,176 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-27 15:41:05,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-27 15:41:05,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-27 15:41:05,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 15:41:05,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-27 15:41:05,181 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-27 15:41:05,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:05,181 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-27 15:41:05,181 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 15:41:05,182 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-27 15:41:05,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 15:41:05,182 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:05,183 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:05,183 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:05,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:05,183 INFO L82 PathProgramCache]: Analyzing trace with hash -35450919, now seen corresponding path program 4 times [2018-10-27 15:41:05,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:05,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:05,185 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:05,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:05,185 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:05,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:05,369 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:05,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:05,369 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:05,370 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:05,370 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:05,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:05,370 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:05,385 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:05,385 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:05,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:05,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:05,417 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:05,418 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:05,540 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:05,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:05,561 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 15:41:05,561 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:05,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 15:41:05,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 15:41:05,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-27 15:41:05,563 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 7 states. [2018-10-27 15:41:05,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:05,711 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 15:41:05,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 15:41:05,712 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-10-27 15:41:05,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:05,714 INFO L225 Difference]: With dead ends: 33 [2018-10-27 15:41:05,714 INFO L226 Difference]: Without dead ends: 28 [2018-10-27 15:41:05,714 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-10-27 15:41:05,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-27 15:41:05,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-27 15:41:05,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-27 15:41:05,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-27 15:41:05,721 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-27 15:41:05,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:05,721 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-27 15:41:05,721 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 15:41:05,721 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-27 15:41:05,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-27 15:41:05,722 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:05,723 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:05,723 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:05,723 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:05,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1170618205, now seen corresponding path program 5 times [2018-10-27 15:41:05,723 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:05,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:05,725 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:05,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:05,725 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:05,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:06,028 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:06,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:06,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:06,029 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:06,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:06,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:06,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:06,040 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:06,040 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:06,052 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 15:41:06,052 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:06,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:06,063 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:06,063 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:06,187 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:06,216 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:06,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 15:41:06,217 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:06,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 15:41:06,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 15:41:06,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-27 15:41:06,218 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 8 states. [2018-10-27 15:41:06,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:06,262 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-27 15:41:06,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 15:41:06,263 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-10-27 15:41:06,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:06,264 INFO L225 Difference]: With dead ends: 36 [2018-10-27 15:41:06,264 INFO L226 Difference]: Without dead ends: 31 [2018-10-27 15:41:06,265 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-10-27 15:41:06,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-27 15:41:06,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-27 15:41:06,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 15:41:06,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-27 15:41:06,270 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-27 15:41:06,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:06,271 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-27 15:41:06,271 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 15:41:06,271 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-27 15:41:06,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 15:41:06,272 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:06,272 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:06,272 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:06,272 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:06,272 INFO L82 PathProgramCache]: Analyzing trace with hash -520507047, now seen corresponding path program 6 times [2018-10-27 15:41:06,272 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:06,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:06,274 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:06,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:06,274 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:06,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:06,395 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:06,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:06,396 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:06,396 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:06,396 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:06,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:06,397 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:06,404 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:06,405 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:06,413 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:06,413 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:06,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:06,424 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:06,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:06,652 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:06,672 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:06,672 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 15:41:06,673 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:06,673 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:41:06,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:41:06,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-27 15:41:06,674 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 9 states. [2018-10-27 15:41:06,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:06,737 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 15:41:06,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 15:41:06,740 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-10-27 15:41:06,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:06,741 INFO L225 Difference]: With dead ends: 39 [2018-10-27 15:41:06,741 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 15:41:06,742 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-10-27 15:41:06,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 15:41:06,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-27 15:41:06,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-27 15:41:06,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-27 15:41:06,747 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-27 15:41:06,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:06,747 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-27 15:41:06,747 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:41:06,748 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-27 15:41:06,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-27 15:41:06,749 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:06,749 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:06,749 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:06,749 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:06,749 INFO L82 PathProgramCache]: Analyzing trace with hash -866507299, now seen corresponding path program 7 times [2018-10-27 15:41:06,750 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:06,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:06,750 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:06,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:06,751 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:06,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:06,928 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:06,929 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:06,929 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:06,929 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:06,930 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:06,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:06,930 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:06,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:06,937 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:06,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:06,952 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:06,961 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:06,961 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:07,165 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:07,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:07,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 15:41:07,186 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:07,187 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 15:41:07,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 15:41:07,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-27 15:41:07,187 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-10-27 15:41:07,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:07,242 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-27 15:41:07,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 15:41:07,245 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-10-27 15:41:07,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:07,246 INFO L225 Difference]: With dead ends: 42 [2018-10-27 15:41:07,246 INFO L226 Difference]: Without dead ends: 37 [2018-10-27 15:41:07,247 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-10-27 15:41:07,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-27 15:41:07,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-27 15:41:07,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 15:41:07,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-27 15:41:07,251 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-27 15:41:07,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:07,251 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-27 15:41:07,252 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 15:41:07,252 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-27 15:41:07,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 15:41:07,253 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:07,253 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:07,253 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:07,253 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:07,253 INFO L82 PathProgramCache]: Analyzing trace with hash -638504231, now seen corresponding path program 8 times [2018-10-27 15:41:07,253 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:07,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:07,254 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:07,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:07,255 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:07,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:07,469 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:07,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:07,469 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:07,470 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:07,470 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:07,470 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:07,470 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:07,480 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:07,480 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:07,491 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 15:41:07,492 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:07,494 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:07,504 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:07,504 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:07,728 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:07,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:07,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 15:41:07,749 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:07,750 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 15:41:07,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 15:41:07,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-27 15:41:07,751 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 11 states. [2018-10-27 15:41:07,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:07,903 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 15:41:07,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 15:41:07,906 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-10-27 15:41:07,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:07,907 INFO L225 Difference]: With dead ends: 45 [2018-10-27 15:41:07,907 INFO L226 Difference]: Without dead ends: 40 [2018-10-27 15:41:07,908 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-10-27 15:41:07,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-27 15:41:07,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-27 15:41:07,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-27 15:41:07,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-27 15:41:07,913 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-27 15:41:07,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:07,913 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-27 15:41:07,913 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 15:41:07,913 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-27 15:41:07,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-27 15:41:07,914 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:07,915 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:07,915 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:07,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:07,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1457599581, now seen corresponding path program 9 times [2018-10-27 15:41:07,915 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:07,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:07,917 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:07,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:07,917 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:07,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:08,044 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:08,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:08,045 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:08,045 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:08,045 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:08,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:08,045 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:08,054 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:08,054 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:08,064 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:08,064 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:08,066 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:08,077 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:08,077 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:08,348 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:08,369 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:08,369 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 15:41:08,369 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:08,370 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 15:41:08,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 15:41:08,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-27 15:41:08,371 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 12 states. [2018-10-27 15:41:08,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:08,421 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-27 15:41:08,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 15:41:08,422 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-10-27 15:41:08,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:08,423 INFO L225 Difference]: With dead ends: 48 [2018-10-27 15:41:08,423 INFO L226 Difference]: Without dead ends: 43 [2018-10-27 15:41:08,425 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-10-27 15:41:08,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-27 15:41:08,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-27 15:41:08,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 15:41:08,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-27 15:41:08,430 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-27 15:41:08,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:08,430 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-27 15:41:08,430 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 15:41:08,431 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-27 15:41:08,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 15:41:08,431 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:08,432 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:08,432 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:08,432 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:08,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1956746329, now seen corresponding path program 10 times [2018-10-27 15:41:08,433 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:08,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:08,434 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:08,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:08,434 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:08,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:08,584 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:08,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:08,584 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:08,584 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:08,585 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:08,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:08,585 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:08,593 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:08,593 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:08,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:08,618 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:08,628 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:08,628 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:09,039 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:09,060 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:09,061 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 15:41:09,061 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:09,061 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 15:41:09,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 15:41:09,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-27 15:41:09,062 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 13 states. [2018-10-27 15:41:09,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:09,154 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 15:41:09,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 15:41:09,154 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-10-27 15:41:09,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:09,155 INFO L225 Difference]: With dead ends: 51 [2018-10-27 15:41:09,155 INFO L226 Difference]: Without dead ends: 46 [2018-10-27 15:41:09,156 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-10-27 15:41:09,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-27 15:41:09,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-27 15:41:09,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-27 15:41:09,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-27 15:41:09,161 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-27 15:41:09,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:09,161 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-27 15:41:09,161 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 15:41:09,161 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-27 15:41:09,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-27 15:41:09,162 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:09,162 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:09,163 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:09,163 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:09,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1434230051, now seen corresponding path program 11 times [2018-10-27 15:41:09,163 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:09,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:09,164 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:09,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:09,165 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:09,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:09,592 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:09,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:09,592 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:09,592 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:09,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:09,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:09,593 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-10-27 15:41:09,607 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:09,607 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:09,640 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 15:41:09,641 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:09,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:09,655 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:09,656 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:09,987 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:10,010 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:10,011 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 15:41:10,011 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:10,011 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 15:41:10,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 15:41:10,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-27 15:41:10,012 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 14 states. [2018-10-27 15:41:10,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:10,112 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-27 15:41:10,112 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 15:41:10,112 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-10-27 15:41:10,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:10,113 INFO L225 Difference]: With dead ends: 54 [2018-10-27 15:41:10,113 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 15:41:10,115 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-10-27 15:41:10,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 15:41:10,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-27 15:41:10,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 15:41:10,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-27 15:41:10,120 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-27 15:41:10,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:10,121 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-27 15:41:10,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 15:41:10,121 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-27 15:41:10,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 15:41:10,122 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:10,122 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:10,122 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:10,123 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:10,123 INFO L82 PathProgramCache]: Analyzing trace with hash -85797415, now seen corresponding path program 12 times [2018-10-27 15:41:10,123 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:10,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:10,124 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:10,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:10,124 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:10,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:10,290 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:10,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:10,291 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:10,291 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:10,291 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:10,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:10,291 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:10,300 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:10,300 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:10,326 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:10,326 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:10,328 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:10,349 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:10,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:10,678 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:10,700 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:10,700 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 15:41:10,700 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:10,700 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 15:41:10,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 15:41:10,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-27 15:41:10,701 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 15 states. [2018-10-27 15:41:10,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:10,746 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 15:41:10,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 15:41:10,747 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-10-27 15:41:10,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:10,748 INFO L225 Difference]: With dead ends: 57 [2018-10-27 15:41:10,748 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 15:41:10,749 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-10-27 15:41:10,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 15:41:10,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-27 15:41:10,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-27 15:41:10,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-27 15:41:10,754 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-27 15:41:10,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:10,754 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-27 15:41:10,755 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 15:41:10,755 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-27 15:41:10,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-27 15:41:10,755 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:10,756 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:10,756 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:10,756 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:10,756 INFO L82 PathProgramCache]: Analyzing trace with hash 241742173, now seen corresponding path program 13 times [2018-10-27 15:41:10,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:10,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:10,757 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:10,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:10,758 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:10,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:10,916 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:10,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:10,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:10,917 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:10,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:10,918 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:10,918 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:10,925 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:10,926 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:10,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:10,943 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:10,953 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:10,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:11,629 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:11,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:11,649 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 15:41:11,649 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:11,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 15:41:11,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 15:41:11,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-27 15:41:11,651 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 16 states. [2018-10-27 15:41:11,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:11,703 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-27 15:41:11,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 15:41:11,704 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-10-27 15:41:11,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:11,705 INFO L225 Difference]: With dead ends: 60 [2018-10-27 15:41:11,705 INFO L226 Difference]: Without dead ends: 55 [2018-10-27 15:41:11,706 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-10-27 15:41:11,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-27 15:41:11,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-27 15:41:11,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 15:41:11,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-27 15:41:11,711 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-27 15:41:11,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:11,711 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-27 15:41:11,711 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 15:41:11,711 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-27 15:41:11,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 15:41:11,712 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:11,713 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:11,713 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:11,713 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:11,713 INFO L82 PathProgramCache]: Analyzing trace with hash -192088231, now seen corresponding path program 14 times [2018-10-27 15:41:11,713 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:11,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:11,714 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:11,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:11,714 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:11,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:11,926 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:11,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:11,927 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:11,927 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:11,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:11,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:11,927 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:11,937 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:11,937 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:11,956 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 15:41:11,956 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:11,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:11,967 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:11,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:12,336 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:12,356 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:12,356 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 15:41:12,356 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:12,357 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 15:41:12,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 15:41:12,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-27 15:41:12,358 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 17 states. [2018-10-27 15:41:12,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:12,443 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-27 15:41:12,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 15:41:12,444 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-10-27 15:41:12,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:12,444 INFO L225 Difference]: With dead ends: 63 [2018-10-27 15:41:12,444 INFO L226 Difference]: Without dead ends: 58 [2018-10-27 15:41:12,445 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-10-27 15:41:12,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-27 15:41:12,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-27 15:41:12,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-27 15:41:12,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-27 15:41:12,450 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-27 15:41:12,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:12,450 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-27 15:41:12,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 15:41:12,450 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-27 15:41:12,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-27 15:41:12,451 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:12,452 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:12,452 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:12,452 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:12,452 INFO L82 PathProgramCache]: Analyzing trace with hash -877060131, now seen corresponding path program 15 times [2018-10-27 15:41:12,452 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:12,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:12,453 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:12,453 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:12,453 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:12,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:12,657 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:12,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:12,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:12,657 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:12,657 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:12,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:12,658 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:12,665 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:12,665 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:12,702 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:12,703 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:12,704 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:12,715 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:12,715 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:13,318 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:13,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:13,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 15:41:13,351 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:13,351 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 15:41:13,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 15:41:13,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 15:41:13,353 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 18 states. [2018-10-27 15:41:13,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:13,473 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-27 15:41:13,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 15:41:13,474 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-10-27 15:41:13,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:13,475 INFO L225 Difference]: With dead ends: 66 [2018-10-27 15:41:13,475 INFO L226 Difference]: Without dead ends: 61 [2018-10-27 15:41:13,477 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 15:41:13,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-27 15:41:13,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-27 15:41:13,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-27 15:41:13,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-27 15:41:13,483 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-27 15:41:13,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:13,483 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-27 15:41:13,483 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 15:41:13,484 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-27 15:41:13,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-27 15:41:13,487 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:13,487 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:13,487 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:13,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:13,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1485309735, now seen corresponding path program 16 times [2018-10-27 15:41:13,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:13,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:13,489 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:13,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:13,489 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:13,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:14,094 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:14,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:14,095 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:14,095 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:14,095 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:14,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:14,095 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:14,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:14,103 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:14,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:14,131 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:14,141 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:14,141 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:14,984 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:15,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:15,005 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 15:41:15,005 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:15,005 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 15:41:15,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 15:41:15,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 15:41:15,006 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 19 states. [2018-10-27 15:41:15,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:15,062 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-27 15:41:15,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 15:41:15,070 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-10-27 15:41:15,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:15,071 INFO L225 Difference]: With dead ends: 69 [2018-10-27 15:41:15,071 INFO L226 Difference]: Without dead ends: 64 [2018-10-27 15:41:15,072 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 15:41:15,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-27 15:41:15,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-27 15:41:15,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-27 15:41:15,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-27 15:41:15,075 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-27 15:41:15,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:15,076 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-27 15:41:15,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 15:41:15,076 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-27 15:41:15,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-27 15:41:15,077 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:15,077 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:15,077 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:15,078 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:15,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1382240675, now seen corresponding path program 17 times [2018-10-27 15:41:15,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:15,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:15,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:15,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:15,079 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:15,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:15,317 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:15,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:15,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:15,318 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:15,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:15,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:15,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:15,334 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:15,334 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:15,362 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 15:41:15,362 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:15,363 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:15,376 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:15,376 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:16,239 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:16,259 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:16,260 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 15:41:16,260 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:16,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 15:41:16,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 15:41:16,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 15:41:16,261 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 20 states. [2018-10-27 15:41:16,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:16,346 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-27 15:41:16,346 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 15:41:16,346 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-10-27 15:41:16,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:16,347 INFO L225 Difference]: With dead ends: 72 [2018-10-27 15:41:16,347 INFO L226 Difference]: Without dead ends: 67 [2018-10-27 15:41:16,348 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 15:41:16,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-27 15:41:16,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-27 15:41:16,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-27 15:41:16,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-27 15:41:16,352 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-27 15:41:16,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:16,353 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-27 15:41:16,353 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 15:41:16,353 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-27 15:41:16,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-27 15:41:16,354 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:16,354 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:16,354 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:16,355 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:16,355 INFO L82 PathProgramCache]: Analyzing trace with hash -1753490855, now seen corresponding path program 18 times [2018-10-27 15:41:16,355 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:16,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:16,356 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:16,356 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:16,356 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:16,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:17,174 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:17,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:17,175 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:17,175 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:17,175 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:17,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:17,175 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:17,185 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:17,185 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:17,198 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:17,198 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:17,201 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:17,213 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:17,213 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:17,673 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:17,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:17,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 15:41:17,693 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:17,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 15:41:17,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 15:41:17,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 15:41:17,694 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 21 states. [2018-10-27 15:41:17,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:17,763 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-27 15:41:17,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 15:41:17,763 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-10-27 15:41:17,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:17,763 INFO L225 Difference]: With dead ends: 75 [2018-10-27 15:41:17,764 INFO L226 Difference]: Without dead ends: 70 [2018-10-27 15:41:17,764 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=780, Invalid=780, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 15:41:17,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-27 15:41:17,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-27 15:41:17,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-27 15:41:17,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-27 15:41:17,769 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-27 15:41:17,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:17,769 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-27 15:41:17,769 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 15:41:17,769 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-27 15:41:17,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-27 15:41:17,770 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:17,770 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:17,770 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:17,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:17,771 INFO L82 PathProgramCache]: Analyzing trace with hash -2126816035, now seen corresponding path program 19 times [2018-10-27 15:41:17,771 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:17,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:17,772 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:17,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:17,772 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:17,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:18,058 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:18,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:18,059 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:18,059 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:18,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:18,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:18,059 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:18,066 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:18,067 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:18,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:18,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:18,104 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:18,104 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:18,552 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:18,572 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:18,572 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 15:41:18,572 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:18,572 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 15:41:18,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 15:41:18,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 15:41:18,573 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 22 states. [2018-10-27 15:41:18,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:18,719 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-27 15:41:18,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 15:41:18,720 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-10-27 15:41:18,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:18,721 INFO L225 Difference]: With dead ends: 78 [2018-10-27 15:41:18,721 INFO L226 Difference]: Without dead ends: 73 [2018-10-27 15:41:18,722 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 15:41:18,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-27 15:41:18,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-27 15:41:18,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-27 15:41:18,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-27 15:41:18,726 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-27 15:41:18,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:18,726 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-27 15:41:18,727 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 15:41:18,727 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-27 15:41:18,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-27 15:41:18,727 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:18,727 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:18,727 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:18,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:18,728 INFO L82 PathProgramCache]: Analyzing trace with hash 108043225, now seen corresponding path program 20 times [2018-10-27 15:41:18,728 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:18,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:18,728 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:18,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:18,729 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:18,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:18,996 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:18,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:18,997 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:18,997 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:18,997 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:18,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:18,997 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:19,005 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:19,005 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:19,023 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 15:41:19,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:19,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:19,034 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:19,035 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:19,857 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:19,877 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:19,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 15:41:19,878 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:19,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 15:41:19,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 15:41:19,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 15:41:19,879 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 23 states. [2018-10-27 15:41:19,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:19,976 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-27 15:41:19,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 15:41:19,980 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2018-10-27 15:41:19,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:19,980 INFO L225 Difference]: With dead ends: 81 [2018-10-27 15:41:19,980 INFO L226 Difference]: Without dead ends: 76 [2018-10-27 15:41:19,981 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 15:41:19,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-27 15:41:19,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-27 15:41:19,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-27 15:41:19,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-27 15:41:19,984 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-27 15:41:19,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:19,985 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-27 15:41:19,985 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 15:41:19,985 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-27 15:41:19,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-27 15:41:19,986 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:19,986 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:19,986 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:19,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:19,986 INFO L82 PathProgramCache]: Analyzing trace with hash -1782764707, now seen corresponding path program 21 times [2018-10-27 15:41:19,986 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:19,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:19,987 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:19,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:19,987 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:19,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:20,355 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:20,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:20,355 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:20,355 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:20,355 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:20,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:20,355 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:20,362 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:20,363 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:20,374 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:20,375 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:20,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:20,389 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:20,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:20,996 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:21,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:21,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-27 15:41:21,017 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:21,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 15:41:21,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 15:41:21,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 15:41:21,019 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 24 states. [2018-10-27 15:41:21,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:21,218 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-27 15:41:21,218 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 15:41:21,218 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 74 [2018-10-27 15:41:21,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:21,219 INFO L225 Difference]: With dead ends: 84 [2018-10-27 15:41:21,220 INFO L226 Difference]: Without dead ends: 79 [2018-10-27 15:41:21,221 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1035, Invalid=1035, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 15:41:21,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-27 15:41:21,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-10-27 15:41:21,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-27 15:41:21,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-10-27 15:41:21,225 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-10-27 15:41:21,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:21,225 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-10-27 15:41:21,226 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 15:41:21,226 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-10-27 15:41:21,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-27 15:41:21,227 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:21,227 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:21,227 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:21,227 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:21,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1949187417, now seen corresponding path program 22 times [2018-10-27 15:41:21,228 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:21,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:21,229 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:21,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:21,229 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:21,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:21,680 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:21,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:21,680 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:21,680 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:21,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:21,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:21,681 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:21,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:21,688 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:21,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:21,707 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:21,726 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:21,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:22,351 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:22,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:22,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-27 15:41:22,371 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:22,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 15:41:22,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 15:41:22,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 15:41:22,372 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 25 states. [2018-10-27 15:41:22,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:22,463 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-27 15:41:22,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 15:41:22,470 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-10-27 15:41:22,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:22,471 INFO L225 Difference]: With dead ends: 87 [2018-10-27 15:41:22,471 INFO L226 Difference]: Without dead ends: 82 [2018-10-27 15:41:22,472 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 15:41:22,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-27 15:41:22,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-10-27 15:41:22,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-27 15:41:22,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-10-27 15:41:22,475 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 77 [2018-10-27 15:41:22,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:22,475 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-10-27 15:41:22,476 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 15:41:22,476 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-10-27 15:41:22,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-27 15:41:22,476 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:22,477 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:22,477 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:22,477 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:22,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1011489245, now seen corresponding path program 23 times [2018-10-27 15:41:22,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:22,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:22,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:22,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:22,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:22,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:22,777 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:22,777 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:22,777 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:22,778 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:22,778 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:22,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:22,778 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:22,785 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:22,785 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:22,805 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-27 15:41:22,805 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:22,807 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:22,820 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:22,820 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:23,509 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:23,529 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:23,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-27 15:41:23,529 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:23,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 15:41:23,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 15:41:23,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 15:41:23,531 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 26 states. [2018-10-27 15:41:23,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:23,611 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-27 15:41:23,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 15:41:23,611 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 80 [2018-10-27 15:41:23,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:23,612 INFO L225 Difference]: With dead ends: 90 [2018-10-27 15:41:23,612 INFO L226 Difference]: Without dead ends: 85 [2018-10-27 15:41:23,614 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 15:41:23,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-27 15:41:23,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2018-10-27 15:41:23,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-27 15:41:23,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-10-27 15:41:23,618 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 80 [2018-10-27 15:41:23,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:23,618 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-10-27 15:41:23,618 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 15:41:23,618 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-10-27 15:41:23,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-27 15:41:23,619 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:23,619 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:23,619 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:23,619 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:23,620 INFO L82 PathProgramCache]: Analyzing trace with hash 512540377, now seen corresponding path program 24 times [2018-10-27 15:41:23,620 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:23,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:23,620 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:23,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:23,621 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:23,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:23,967 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:23,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:23,967 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:23,967 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:23,967 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:23,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:23,968 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:23,975 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:23,975 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:23,991 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:23,992 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:23,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:24,005 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:24,005 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:24,955 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:24,975 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:24,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-27 15:41:24,975 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:24,976 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 15:41:24,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 15:41:24,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 15:41:24,977 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 27 states. [2018-10-27 15:41:25,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:25,108 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-27 15:41:25,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-27 15:41:25,112 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-10-27 15:41:25,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:25,113 INFO L225 Difference]: With dead ends: 93 [2018-10-27 15:41:25,113 INFO L226 Difference]: Without dead ends: 88 [2018-10-27 15:41:25,115 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 15:41:25,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-27 15:41:25,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-10-27 15:41:25,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-27 15:41:25,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-10-27 15:41:25,118 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 83 [2018-10-27 15:41:25,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:25,118 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-10-27 15:41:25,118 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 15:41:25,119 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-10-27 15:41:25,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-27 15:41:25,119 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:25,120 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:25,120 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:25,120 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:25,120 INFO L82 PathProgramCache]: Analyzing trace with hash 1208625245, now seen corresponding path program 25 times [2018-10-27 15:41:25,120 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:25,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:25,121 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:25,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:25,121 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:25,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:26,116 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:26,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:26,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:26,117 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:26,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:26,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:26,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:26,125 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:26,125 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:26,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:26,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:26,156 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:26,157 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:28,340 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:28,360 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:28,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2018-10-27 15:41:28,360 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:28,361 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 15:41:28,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 15:41:28,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-27 15:41:28,362 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 28 states. [2018-10-27 15:41:28,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:28,445 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-27 15:41:28,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 15:41:28,446 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 86 [2018-10-27 15:41:28,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:28,447 INFO L225 Difference]: With dead ends: 96 [2018-10-27 15:41:28,447 INFO L226 Difference]: Without dead ends: 91 [2018-10-27 15:41:28,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-10-27 15:41:28,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-27 15:41:28,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-27 15:41:28,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-27 15:41:28,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-10-27 15:41:28,453 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 86 [2018-10-27 15:41:28,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:28,453 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-10-27 15:41:28,453 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 15:41:28,453 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-10-27 15:41:28,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-27 15:41:28,454 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:28,454 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:28,454 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:28,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:28,455 INFO L82 PathProgramCache]: Analyzing trace with hash -2124144551, now seen corresponding path program 26 times [2018-10-27 15:41:28,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:28,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:28,456 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:28,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:28,456 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:28,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:28,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:28,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:28,912 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:28,912 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:28,912 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:28,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:28,912 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:28,919 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:28,919 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:28,945 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-27 15:41:28,945 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:28,947 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:28,963 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:28,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:30,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:30,038 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:30,038 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-27 15:41:30,038 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:30,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 15:41:30,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 15:41:30,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 15:41:30,040 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 29 states. [2018-10-27 15:41:30,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:30,121 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-27 15:41:30,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 15:41:30,122 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 89 [2018-10-27 15:41:30,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:30,123 INFO L225 Difference]: With dead ends: 99 [2018-10-27 15:41:30,124 INFO L226 Difference]: Without dead ends: 94 [2018-10-27 15:41:30,125 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 15:41:30,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-27 15:41:30,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-10-27 15:41:30,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-27 15:41:30,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-10-27 15:41:30,128 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 89 [2018-10-27 15:41:30,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:30,128 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-10-27 15:41:30,128 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 15:41:30,129 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-10-27 15:41:30,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-27 15:41:30,129 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:30,129 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:30,130 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:30,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:30,130 INFO L82 PathProgramCache]: Analyzing trace with hash -1910155555, now seen corresponding path program 27 times [2018-10-27 15:41:30,130 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:30,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:30,131 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:30,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:30,131 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:30,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:30,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:30,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:30,854 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:30,854 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:30,854 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:30,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:30,854 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:30,861 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:30,861 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:30,878 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:30,879 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:30,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:30,894 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:30,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:31,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:31,832 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:31,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-27 15:41:31,833 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:31,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 15:41:31,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 15:41:31,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-10-27 15:41:31,835 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 30 states. [2018-10-27 15:41:31,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:31,926 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-27 15:41:31,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 15:41:31,927 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 92 [2018-10-27 15:41:31,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:31,928 INFO L225 Difference]: With dead ends: 102 [2018-10-27 15:41:31,928 INFO L226 Difference]: Without dead ends: 97 [2018-10-27 15:41:31,929 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1653, Invalid=1653, Unknown=0, NotChecked=0, Total=3306 [2018-10-27 15:41:31,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-27 15:41:31,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2018-10-27 15:41:31,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-27 15:41:31,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-10-27 15:41:31,933 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 92 [2018-10-27 15:41:31,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:31,934 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-10-27 15:41:31,934 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 15:41:31,934 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-10-27 15:41:31,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-27 15:41:31,934 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:31,935 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:31,935 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:31,935 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:31,935 INFO L82 PathProgramCache]: Analyzing trace with hash -695442983, now seen corresponding path program 28 times [2018-10-27 15:41:31,935 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:31,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:31,936 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:31,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:31,936 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:31,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:32,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:32,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:32,767 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:32,767 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:32,767 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:32,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:32,767 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:32,775 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:32,775 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:32,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:32,797 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:32,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:32,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:33,889 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:33,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:33,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2018-10-27 15:41:33,909 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:33,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 15:41:33,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 15:41:33,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2018-10-27 15:41:33,911 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 31 states. [2018-10-27 15:41:34,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:34,053 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-27 15:41:34,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 15:41:34,054 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 95 [2018-10-27 15:41:34,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:34,055 INFO L225 Difference]: With dead ends: 105 [2018-10-27 15:41:34,055 INFO L226 Difference]: Without dead ends: 100 [2018-10-27 15:41:34,057 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1770, Invalid=1770, Unknown=0, NotChecked=0, Total=3540 [2018-10-27 15:41:34,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-27 15:41:34,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-10-27 15:41:34,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-27 15:41:34,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-10-27 15:41:34,060 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 95 [2018-10-27 15:41:34,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:34,060 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-10-27 15:41:34,060 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 15:41:34,061 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-10-27 15:41:34,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-27 15:41:34,061 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:34,061 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:34,062 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:34,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:34,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1707320669, now seen corresponding path program 29 times [2018-10-27 15:41:34,062 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:34,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:34,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:34,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:34,063 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:34,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:35,215 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:35,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:35,215 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:35,215 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:35,215 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:35,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:35,215 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:35,223 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:35,223 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:35,253 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-27 15:41:35,253 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:35,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:35,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:35,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:36,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:36,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:36,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-27 15:41:36,402 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:36,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 15:41:36,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 15:41:36,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 15:41:36,403 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 32 states. [2018-10-27 15:41:36,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:36,641 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-27 15:41:36,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 15:41:36,642 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 98 [2018-10-27 15:41:36,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:36,643 INFO L225 Difference]: With dead ends: 108 [2018-10-27 15:41:36,643 INFO L226 Difference]: Without dead ends: 103 [2018-10-27 15:41:36,644 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1891, Invalid=1891, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 15:41:36,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-27 15:41:36,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-27 15:41:36,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-27 15:41:36,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-10-27 15:41:36,648 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 98 [2018-10-27 15:41:36,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:36,649 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-10-27 15:41:36,649 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 15:41:36,649 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-10-27 15:41:36,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-27 15:41:36,650 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:36,650 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:36,650 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:36,650 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:36,650 INFO L82 PathProgramCache]: Analyzing trace with hash -1780645031, now seen corresponding path program 30 times [2018-10-27 15:41:36,650 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:36,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:36,651 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:36,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:36,651 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:36,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:37,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:37,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:37,129 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:37,129 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:37,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:37,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:37,129 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:37,138 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:37,138 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:37,158 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:37,158 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:37,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:37,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:37,178 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:38,281 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:38,301 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:38,301 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2018-10-27 15:41:38,301 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:38,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 15:41:38,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 15:41:38,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-10-27 15:41:38,303 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 33 states. [2018-10-27 15:41:38,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:38,430 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-27 15:41:38,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-27 15:41:38,431 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 101 [2018-10-27 15:41:38,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:38,432 INFO L225 Difference]: With dead ends: 111 [2018-10-27 15:41:38,432 INFO L226 Difference]: Without dead ends: 106 [2018-10-27 15:41:38,433 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2016, Invalid=2016, Unknown=0, NotChecked=0, Total=4032 [2018-10-27 15:41:38,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-27 15:41:38,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-10-27 15:41:38,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-27 15:41:38,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2018-10-27 15:41:38,437 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 101 [2018-10-27 15:41:38,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:38,437 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2018-10-27 15:41:38,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 15:41:38,437 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2018-10-27 15:41:38,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-27 15:41:38,438 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:38,438 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:38,438 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:38,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:38,439 INFO L82 PathProgramCache]: Analyzing trace with hash 671945693, now seen corresponding path program 31 times [2018-10-27 15:41:38,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:38,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:38,440 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:38,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:38,440 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:38,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:39,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:39,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:39,346 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:39,346 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:39,346 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:39,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:39,346 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:39,355 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:39,355 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:39,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:39,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:39,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:39,390 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:40,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:40,883 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:40,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2018-10-27 15:41:40,883 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:40,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 15:41:40,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 15:41:40,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2018-10-27 15:41:40,885 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 34 states. [2018-10-27 15:41:41,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:41,030 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-27 15:41:41,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 15:41:41,031 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 104 [2018-10-27 15:41:41,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:41,032 INFO L225 Difference]: With dead ends: 114 [2018-10-27 15:41:41,033 INFO L226 Difference]: Without dead ends: 109 [2018-10-27 15:41:41,034 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2145, Invalid=2145, Unknown=0, NotChecked=0, Total=4290 [2018-10-27 15:41:41,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-27 15:41:41,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2018-10-27 15:41:41,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-27 15:41:41,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-10-27 15:41:41,037 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 104 [2018-10-27 15:41:41,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:41,038 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-10-27 15:41:41,038 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 15:41:41,038 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-10-27 15:41:41,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-27 15:41:41,039 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:41,039 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:41,039 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:41,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:41,039 INFO L82 PathProgramCache]: Analyzing trace with hash -181435175, now seen corresponding path program 32 times [2018-10-27 15:41:41,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:41,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:41,040 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:41,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:41,040 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:41,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:41,521 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:41,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:41,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:41,521 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:41,521 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:41,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:41,521 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:41,529 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:41,529 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:41,560 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-27 15:41:41,560 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:41,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:41,577 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:41,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:42,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:42,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:42,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-27 15:41:42,828 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:42,829 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 15:41:42,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 15:41:42,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 15:41:42,830 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 35 states. [2018-10-27 15:41:42,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:42,974 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-27 15:41:42,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 15:41:42,975 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 107 [2018-10-27 15:41:42,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:42,976 INFO L225 Difference]: With dead ends: 117 [2018-10-27 15:41:42,976 INFO L226 Difference]: Without dead ends: 112 [2018-10-27 15:41:42,977 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2278, Invalid=2278, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 15:41:42,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-27 15:41:42,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-27 15:41:42,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-27 15:41:42,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-10-27 15:41:42,981 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 107 [2018-10-27 15:41:42,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:42,981 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-10-27 15:41:42,981 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 15:41:42,981 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-10-27 15:41:42,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-27 15:41:42,982 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:42,982 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:42,982 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:42,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:42,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1339448739, now seen corresponding path program 33 times [2018-10-27 15:41:42,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:42,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:42,983 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:42,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:42,983 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:42,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:43,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:43,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:43,680 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:43,680 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:43,680 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:43,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:43,681 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:43,688 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:43,688 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:43,711 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:43,711 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:43,714 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:43,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:43,729 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:45,266 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:45,286 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:45,286 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 70 [2018-10-27 15:41:45,286 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:45,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 15:41:45,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 15:41:45,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-10-27 15:41:45,288 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 36 states. [2018-10-27 15:41:45,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:45,433 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-27 15:41:45,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-27 15:41:45,433 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 110 [2018-10-27 15:41:45,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:45,434 INFO L225 Difference]: With dead ends: 120 [2018-10-27 15:41:45,434 INFO L226 Difference]: Without dead ends: 115 [2018-10-27 15:41:45,435 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 187 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2415, Invalid=2415, Unknown=0, NotChecked=0, Total=4830 [2018-10-27 15:41:45,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-27 15:41:45,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-10-27 15:41:45,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-27 15:41:45,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-10-27 15:41:45,439 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 110 [2018-10-27 15:41:45,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:45,439 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-10-27 15:41:45,439 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 15:41:45,439 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-10-27 15:41:45,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-27 15:41:45,440 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:45,440 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:45,440 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:45,441 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:45,441 INFO L82 PathProgramCache]: Analyzing trace with hash 1750754905, now seen corresponding path program 34 times [2018-10-27 15:41:45,441 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:45,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:45,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:45,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:45,442 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:45,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:46,114 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:46,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:46,114 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:46,114 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:46,114 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:46,114 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:46,114 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:46,121 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:46,121 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:46,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:46,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:46,160 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:46,161 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:47,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:47,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:47,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 72 [2018-10-27 15:41:47,492 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:47,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 15:41:47,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 15:41:47,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2018-10-27 15:41:47,493 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 37 states. [2018-10-27 15:41:47,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:47,614 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-27 15:41:47,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 15:41:47,614 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 113 [2018-10-27 15:41:47,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:47,615 INFO L225 Difference]: With dead ends: 123 [2018-10-27 15:41:47,616 INFO L226 Difference]: Without dead ends: 118 [2018-10-27 15:41:47,616 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2018-10-27 15:41:47,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-27 15:41:47,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-10-27 15:41:47,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-27 15:41:47,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2018-10-27 15:41:47,619 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 113 [2018-10-27 15:41:47,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:47,619 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2018-10-27 15:41:47,619 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 15:41:47,620 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2018-10-27 15:41:47,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-27 15:41:47,620 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:47,620 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:47,620 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:47,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:47,621 INFO L82 PathProgramCache]: Analyzing trace with hash -616476451, now seen corresponding path program 35 times [2018-10-27 15:41:47,621 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:47,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:47,621 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:47,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:47,622 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:47,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:48,203 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:48,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:48,204 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:48,204 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:48,204 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:48,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:48,204 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:48,212 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:48,212 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:48,251 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-27 15:41:48,251 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:48,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:48,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:48,275 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:49,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:49,832 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:49,832 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-27 15:41:49,832 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:49,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 15:41:49,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 15:41:49,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 15:41:49,833 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 38 states. [2018-10-27 15:41:49,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:49,956 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-27 15:41:49,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 15:41:49,962 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 116 [2018-10-27 15:41:49,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:49,963 INFO L225 Difference]: With dead ends: 126 [2018-10-27 15:41:49,963 INFO L226 Difference]: Without dead ends: 121 [2018-10-27 15:41:49,964 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2701, Invalid=2701, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 15:41:49,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-27 15:41:49,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-10-27 15:41:49,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-27 15:41:49,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-10-27 15:41:49,967 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 116 [2018-10-27 15:41:49,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:49,968 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-10-27 15:41:49,968 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 15:41:49,968 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-10-27 15:41:49,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-27 15:41:49,968 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:49,969 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:49,969 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:49,969 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:49,969 INFO L82 PathProgramCache]: Analyzing trace with hash 557197273, now seen corresponding path program 36 times [2018-10-27 15:41:49,969 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:49,970 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:49,970 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:49,970 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:49,970 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:49,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:50,700 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:50,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:50,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:50,700 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:50,700 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:50,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:50,701 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:50,708 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:50,708 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:50,729 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:50,729 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:50,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:50,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:50,755 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:52,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:52,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:52,660 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-10-27 15:41:52,660 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:52,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 15:41:52,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 15:41:52,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 15:41:52,661 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 39 states. [2018-10-27 15:41:52,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:52,807 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-27 15:41:52,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 15:41:52,807 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 119 [2018-10-27 15:41:52,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:52,808 INFO L225 Difference]: With dead ends: 129 [2018-10-27 15:41:52,808 INFO L226 Difference]: Without dead ends: 124 [2018-10-27 15:41:52,809 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=2850, Invalid=2850, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 15:41:52,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-27 15:41:52,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-10-27 15:41:52,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-27 15:41:52,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-10-27 15:41:52,812 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 119 [2018-10-27 15:41:52,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:52,813 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-10-27 15:41:52,813 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 15:41:52,813 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-10-27 15:41:52,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-27 15:41:52,814 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:52,814 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:52,814 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:52,814 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:52,814 INFO L82 PathProgramCache]: Analyzing trace with hash 142352221, now seen corresponding path program 37 times [2018-10-27 15:41:52,814 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:52,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:52,815 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:52,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:52,815 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:52,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:53,669 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:53,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:53,669 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:53,669 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:53,669 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:53,670 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:53,670 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:53,677 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:53,677 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:41:53,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:53,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:53,733 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:53,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:55,533 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:55,552 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:55,553 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 78 [2018-10-27 15:41:55,553 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:55,553 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 15:41:55,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 15:41:55,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2018-10-27 15:41:55,554 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 40 states. [2018-10-27 15:41:55,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:55,688 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-27 15:41:55,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 15:41:55,689 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 122 [2018-10-27 15:41:55,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:55,691 INFO L225 Difference]: With dead ends: 132 [2018-10-27 15:41:55,691 INFO L226 Difference]: Without dead ends: 127 [2018-10-27 15:41:55,692 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=3003, Invalid=3003, Unknown=0, NotChecked=0, Total=6006 [2018-10-27 15:41:55,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-27 15:41:55,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2018-10-27 15:41:55,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-27 15:41:55,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-10-27 15:41:55,695 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 122 [2018-10-27 15:41:55,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:55,695 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-10-27 15:41:55,696 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 15:41:55,696 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-10-27 15:41:55,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-27 15:41:55,696 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:55,696 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:55,697 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:55,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:55,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1885681319, now seen corresponding path program 38 times [2018-10-27 15:41:55,697 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:55,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:55,698 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:41:55,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:55,698 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:55,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:57,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:57,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:57,361 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:57,361 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:57,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:57,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:57,361 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:41:57,368 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:41:57,369 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:41:57,404 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-27 15:41:57,404 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:57,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:57,428 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:57,428 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:41:59,044 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:41:59,063 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:41:59,064 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-27 15:41:59,064 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:41:59,064 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 15:41:59,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 15:41:59,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 15:41:59,065 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 41 states. [2018-10-27 15:41:59,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:41:59,194 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-27 15:41:59,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 15:41:59,195 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 125 [2018-10-27 15:41:59,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:41:59,196 INFO L225 Difference]: With dead ends: 135 [2018-10-27 15:41:59,196 INFO L226 Difference]: Without dead ends: 130 [2018-10-27 15:41:59,197 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 212 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3160, Invalid=3160, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 15:41:59,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-27 15:41:59,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-10-27 15:41:59,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-27 15:41:59,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2018-10-27 15:41:59,201 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 125 [2018-10-27 15:41:59,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:41:59,202 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2018-10-27 15:41:59,202 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 15:41:59,202 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2018-10-27 15:41:59,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-27 15:41:59,203 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:41:59,203 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:41:59,203 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:41:59,203 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:41:59,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1727918627, now seen corresponding path program 39 times [2018-10-27 15:41:59,203 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:41:59,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:59,204 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:41:59,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:41:59,204 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:41:59,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:41:59,879 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 15:41:59,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:59,880 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:41:59,880 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:41:59,880 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:41:59,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:41:59,880 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 15:41:59,888 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:41:59,889 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:41:59,906 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:41:59,906 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:41:59,909 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:41:59,926 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 15:41:59,926 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:01,927 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 15:42:01,957 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:01,957 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 82 [2018-10-27 15:42:01,957 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:01,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 15:42:01,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 15:42:01,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-10-27 15:42:01,959 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 42 states. [2018-10-27 15:42:02,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:02,194 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-10-27 15:42:02,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-27 15:42:02,202 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 128 [2018-10-27 15:42:02,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:02,203 INFO L225 Difference]: With dead ends: 138 [2018-10-27 15:42:02,203 INFO L226 Difference]: Without dead ends: 133 [2018-10-27 15:42:02,204 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 217 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3321, Invalid=3321, Unknown=0, NotChecked=0, Total=6642 [2018-10-27 15:42:02,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-27 15:42:02,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2018-10-27 15:42:02,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-27 15:42:02,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-10-27 15:42:02,208 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 128 [2018-10-27 15:42:02,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:02,208 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-10-27 15:42:02,208 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 15:42:02,208 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-10-27 15:42:02,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-27 15:42:02,209 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:02,209 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:02,209 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:02,209 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:02,210 INFO L82 PathProgramCache]: Analyzing trace with hash -513783079, now seen corresponding path program 40 times [2018-10-27 15:42:02,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:02,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:02,210 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:02,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:02,211 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:02,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:03,560 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 15:42:03,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:03,561 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:03,561 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:03,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:03,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:03,561 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 15:42:03,569 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:03,569 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:03,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:03,593 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:03,612 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 15:42:03,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:05,838 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 15:42:05,868 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:05,868 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 84 [2018-10-27 15:42:05,868 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:05,869 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 15:42:05,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 15:42:05,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-10-27 15:42:05,870 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 43 states. [2018-10-27 15:42:06,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:06,089 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-10-27 15:42:06,089 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 15:42:06,089 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 131 [2018-10-27 15:42:06,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:06,090 INFO L225 Difference]: With dead ends: 141 [2018-10-27 15:42:06,090 INFO L226 Difference]: Without dead ends: 136 [2018-10-27 15:42:06,091 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3486, Invalid=3486, Unknown=0, NotChecked=0, Total=6972 [2018-10-27 15:42:06,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-27 15:42:06,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-10-27 15:42:06,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-27 15:42:06,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-10-27 15:42:06,095 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 131 [2018-10-27 15:42:06,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:06,095 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-10-27 15:42:06,095 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 15:42:06,095 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-10-27 15:42:06,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-27 15:42:06,096 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:06,096 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:06,096 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:06,097 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:06,097 INFO L82 PathProgramCache]: Analyzing trace with hash 1878727773, now seen corresponding path program 41 times [2018-10-27 15:42:06,097 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:06,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:06,098 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:06,098 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:06,098 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:06,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:07,183 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 15:42:07,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:07,184 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:07,184 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:07,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:07,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:07,184 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 15:42:07,192 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:07,193 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:07,396 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-27 15:42:07,396 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:07,399 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:07,424 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 15:42:07,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:09,277 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 15:42:09,297 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:09,297 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-27 15:42:09,297 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:09,297 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 15:42:09,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 15:42:09,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-27 15:42:09,299 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 44 states. [2018-10-27 15:42:09,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:09,722 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-10-27 15:42:09,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 15:42:09,724 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 134 [2018-10-27 15:42:09,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:09,725 INFO L225 Difference]: With dead ends: 144 [2018-10-27 15:42:09,726 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 15:42:09,726 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 227 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=3655, Invalid=3655, Unknown=0, NotChecked=0, Total=7310 [2018-10-27 15:42:09,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 15:42:09,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-10-27 15:42:09,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-27 15:42:09,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-10-27 15:42:09,730 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 134 [2018-10-27 15:42:09,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:09,730 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-10-27 15:42:09,730 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 15:42:09,730 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-10-27 15:42:09,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-27 15:42:09,731 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:09,731 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:09,732 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:09,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:09,732 INFO L82 PathProgramCache]: Analyzing trace with hash -2107724711, now seen corresponding path program 42 times [2018-10-27 15:42:09,732 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:09,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:09,733 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:09,733 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:09,733 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:09,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:10,868 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 15:42:10,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:10,869 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:10,869 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:10,869 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:10,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:10,869 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 15:42:10,876 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:10,877 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:10,898 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:10,898 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:10,902 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:10,928 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 15:42:10,929 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:14,424 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 15:42:14,445 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:14,445 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 88 [2018-10-27 15:42:14,445 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:14,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 15:42:14,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 15:42:14,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-10-27 15:42:14,447 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 45 states. [2018-10-27 15:42:14,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:14,573 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-10-27 15:42:14,573 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-27 15:42:14,573 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 137 [2018-10-27 15:42:14,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:14,575 INFO L225 Difference]: With dead ends: 147 [2018-10-27 15:42:14,575 INFO L226 Difference]: Without dead ends: 142 [2018-10-27 15:42:14,576 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3828, Invalid=3828, Unknown=0, NotChecked=0, Total=7656 [2018-10-27 15:42:14,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-27 15:42:14,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-10-27 15:42:14,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-27 15:42:14,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2018-10-27 15:42:14,580 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 137 [2018-10-27 15:42:14,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:14,581 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2018-10-27 15:42:14,581 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 15:42:14,581 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2018-10-27 15:42:14,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-27 15:42:14,582 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:14,582 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:14,582 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:14,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:14,582 INFO L82 PathProgramCache]: Analyzing trace with hash 1921993437, now seen corresponding path program 43 times [2018-10-27 15:42:14,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:14,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:14,583 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:14,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:14,583 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:14,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:16,063 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 15:42:16,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:16,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:16,064 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:16,064 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:16,064 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:16,064 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 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 15:42:16,073 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:16,073 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:16,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:16,102 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:16,121 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 15:42:16,122 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:18,284 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 15:42:18,304 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:18,304 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 90 [2018-10-27 15:42:18,304 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:18,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-27 15:42:18,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-27 15:42:18,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2018-10-27 15:42:18,305 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 46 states. [2018-10-27 15:42:18,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:18,445 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-10-27 15:42:18,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 15:42:18,446 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 140 [2018-10-27 15:42:18,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:18,447 INFO L225 Difference]: With dead ends: 150 [2018-10-27 15:42:18,447 INFO L226 Difference]: Without dead ends: 145 [2018-10-27 15:42:18,448 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4005, Invalid=4005, Unknown=0, NotChecked=0, Total=8010 [2018-10-27 15:42:18,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-27 15:42:18,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2018-10-27 15:42:18,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-27 15:42:18,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-10-27 15:42:18,453 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 140 [2018-10-27 15:42:18,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:18,453 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-10-27 15:42:18,453 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-27 15:42:18,453 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-10-27 15:42:18,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-27 15:42:18,454 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:18,454 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:18,455 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:18,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:18,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1670517287, now seen corresponding path program 44 times [2018-10-27 15:42:18,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:18,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:18,456 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:18,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:18,456 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:18,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:19,519 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 15:42:19,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:19,519 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:19,519 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:19,519 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:19,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:19,520 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 15:42:19,527 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:19,527 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:19,576 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-10-27 15:42:19,576 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:19,578 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:19,600 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 15:42:19,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:22,066 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 15:42:22,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:22,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-27 15:42:22,087 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:22,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 15:42:22,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 15:42:22,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 15:42:22,088 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 47 states. [2018-10-27 15:42:22,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:22,222 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-10-27 15:42:22,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 15:42:22,223 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 143 [2018-10-27 15:42:22,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:22,224 INFO L225 Difference]: With dead ends: 153 [2018-10-27 15:42:22,225 INFO L226 Difference]: Without dead ends: 148 [2018-10-27 15:42:22,225 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 242 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4186, Invalid=4186, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 15:42:22,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-27 15:42:22,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-10-27 15:42:22,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-27 15:42:22,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-10-27 15:42:22,229 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 143 [2018-10-27 15:42:22,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:22,230 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-10-27 15:42:22,230 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 15:42:22,230 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-10-27 15:42:22,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-27 15:42:22,231 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:22,231 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:22,231 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:22,231 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:22,231 INFO L82 PathProgramCache]: Analyzing trace with hash 132553053, now seen corresponding path program 45 times [2018-10-27 15:42:22,231 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:22,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:22,232 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:22,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:22,232 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:22,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:23,206 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 15:42:23,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:23,206 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:23,206 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:23,206 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:23,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:23,207 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 15:42:23,215 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:23,215 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:23,239 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:23,239 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:23,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:23,265 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 15:42:23,265 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:25,527 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 15:42:25,548 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:25,548 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-10-27 15:42:25,548 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:25,548 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 15:42:25,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 15:42:25,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-10-27 15:42:25,550 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 48 states. [2018-10-27 15:42:25,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:25,688 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-10-27 15:42:25,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-27 15:42:25,688 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 146 [2018-10-27 15:42:25,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:25,689 INFO L225 Difference]: With dead ends: 156 [2018-10-27 15:42:25,690 INFO L226 Difference]: Without dead ends: 151 [2018-10-27 15:42:25,690 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 247 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4371, Invalid=4371, Unknown=0, NotChecked=0, Total=8742 [2018-10-27 15:42:25,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-27 15:42:25,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-10-27 15:42:25,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-27 15:42:25,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-10-27 15:42:25,693 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 146 [2018-10-27 15:42:25,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:25,693 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-10-27 15:42:25,693 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 15:42:25,693 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-10-27 15:42:25,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-27 15:42:25,694 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:25,694 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:25,694 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:25,694 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:25,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1754919079, now seen corresponding path program 46 times [2018-10-27 15:42:25,695 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:25,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:25,695 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:25,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:25,695 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:25,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:26,891 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 15:42:26,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:26,892 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:26,892 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:26,892 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:26,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:26,892 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 15:42:26,901 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:26,901 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:26,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:26,935 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:26,962 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 15:42:26,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:29,311 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 15:42:29,331 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:29,331 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-10-27 15:42:29,331 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:29,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 15:42:29,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 15:42:29,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2018-10-27 15:42:29,332 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 49 states. [2018-10-27 15:42:29,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:29,511 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-10-27 15:42:29,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 15:42:29,511 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 149 [2018-10-27 15:42:29,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:29,512 INFO L225 Difference]: With dead ends: 159 [2018-10-27 15:42:29,512 INFO L226 Difference]: Without dead ends: 154 [2018-10-27 15:42:29,513 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2018-10-27 15:42:29,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-27 15:42:29,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-10-27 15:42:29,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-27 15:42:29,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2018-10-27 15:42:29,517 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 149 [2018-10-27 15:42:29,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:29,517 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2018-10-27 15:42:29,517 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 15:42:29,518 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2018-10-27 15:42:29,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-27 15:42:29,518 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:29,519 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:29,519 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:29,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:29,519 INFO L82 PathProgramCache]: Analyzing trace with hash -1725364259, now seen corresponding path program 47 times [2018-10-27 15:42:29,519 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:29,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:29,523 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:29,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:29,524 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:29,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:30,462 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 15:42:30,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:30,463 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:30,463 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:30,463 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:30,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:30,463 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 15:42:30,470 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:30,471 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:30,525 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-27 15:42:30,525 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:30,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:30,558 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 15:42:30,558 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:33,397 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 15:42:33,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:33,418 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-27 15:42:33,418 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:33,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-27 15:42:33,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-27 15:42:33,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-27 15:42:33,420 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 50 states. [2018-10-27 15:42:33,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:33,605 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-10-27 15:42:33,605 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 15:42:33,605 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 152 [2018-10-27 15:42:33,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:33,606 INFO L225 Difference]: With dead ends: 162 [2018-10-27 15:42:33,606 INFO L226 Difference]: Without dead ends: 157 [2018-10-27 15:42:33,607 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 257 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4753, Invalid=4753, Unknown=0, NotChecked=0, Total=9506 [2018-10-27 15:42:33,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-27 15:42:33,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-10-27 15:42:33,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-10-27 15:42:33,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-10-27 15:42:33,610 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 152 [2018-10-27 15:42:33,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:33,611 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-10-27 15:42:33,611 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-27 15:42:33,611 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-10-27 15:42:33,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-27 15:42:33,612 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:33,612 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:33,612 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:33,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:33,612 INFO L82 PathProgramCache]: Analyzing trace with hash -1726017319, now seen corresponding path program 48 times [2018-10-27 15:42:33,612 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:33,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:33,613 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:33,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:33,613 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:33,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:34,904 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 15:42:34,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:34,905 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:34,905 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:34,905 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:34,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:34,905 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 15:42:34,912 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:34,912 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:34,937 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:34,938 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:34,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:34,964 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 15:42:34,964 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:37,767 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 15:42:37,787 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:37,787 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 100 [2018-10-27 15:42:37,788 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:37,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 15:42:37,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 15:42:37,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-10-27 15:42:37,789 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 51 states. [2018-10-27 15:42:37,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:37,956 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-10-27 15:42:37,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-27 15:42:37,957 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 155 [2018-10-27 15:42:37,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:37,958 INFO L225 Difference]: With dead ends: 165 [2018-10-27 15:42:37,958 INFO L226 Difference]: Without dead ends: 160 [2018-10-27 15:42:37,958 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 262 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4950, Invalid=4950, Unknown=0, NotChecked=0, Total=9900 [2018-10-27 15:42:37,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-27 15:42:37,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-27 15:42:37,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-27 15:42:37,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-10-27 15:42:37,961 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 155 [2018-10-27 15:42:37,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:37,961 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-10-27 15:42:37,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 15:42:37,961 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-10-27 15:42:37,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-27 15:42:37,962 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:37,962 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:37,962 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:37,962 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:37,962 INFO L82 PathProgramCache]: Analyzing trace with hash 293508701, now seen corresponding path program 49 times [2018-10-27 15:42:37,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:37,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:37,963 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:37,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:37,963 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:37,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:39,025 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 15:42:39,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:39,026 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:39,026 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:39,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:39,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:39,026 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 15:42:39,037 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:39,037 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:39,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:39,065 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:39,089 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 15:42:39,089 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:42,073 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 15:42:42,093 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:42,093 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 102 [2018-10-27 15:42:42,093 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:42,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-27 15:42:42,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-27 15:42:42,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-27 15:42:42,095 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 52 states. [2018-10-27 15:42:42,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:42,246 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-10-27 15:42:42,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-27 15:42:42,247 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 158 [2018-10-27 15:42:42,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:42,248 INFO L225 Difference]: With dead ends: 168 [2018-10-27 15:42:42,249 INFO L226 Difference]: Without dead ends: 163 [2018-10-27 15:42:42,249 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 267 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5151, Invalid=5151, Unknown=0, NotChecked=0, Total=10302 [2018-10-27 15:42:42,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-27 15:42:42,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2018-10-27 15:42:42,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-27 15:42:42,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-10-27 15:42:42,252 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 158 [2018-10-27 15:42:42,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:42,253 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-10-27 15:42:42,253 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-27 15:42:42,253 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-10-27 15:42:42,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-27 15:42:42,254 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:42,254 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:42,254 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:42,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:42,255 INFO L82 PathProgramCache]: Analyzing trace with hash 91288153, now seen corresponding path program 50 times [2018-10-27 15:42:42,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:42,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:42,255 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:42,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:42,256 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:42,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:43,482 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 15:42:43,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:43,482 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:43,482 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:43,483 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:43,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:43,483 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 15:42:43,492 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:43,492 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:43,541 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2018-10-27 15:42:43,541 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:43,544 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:43,577 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 15:42:43,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:46,785 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 15:42:46,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:46,805 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-27 15:42:46,805 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:46,805 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-27 15:42:46,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-27 15:42:46,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-10-27 15:42:46,807 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 53 states. [2018-10-27 15:42:46,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:46,992 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-10-27 15:42:46,992 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 15:42:46,992 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 161 [2018-10-27 15:42:46,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:46,994 INFO L225 Difference]: With dead ends: 171 [2018-10-27 15:42:46,994 INFO L226 Difference]: Without dead ends: 166 [2018-10-27 15:42:46,995 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 272 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2018-10-27 15:42:46,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-27 15:42:46,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-10-27 15:42:46,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-27 15:42:46,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2018-10-27 15:42:46,999 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 161 [2018-10-27 15:42:46,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:46,999 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2018-10-27 15:42:46,999 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-27 15:42:46,999 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2018-10-27 15:42:47,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-27 15:42:47,000 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:47,000 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:47,001 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:47,001 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:47,001 INFO L82 PathProgramCache]: Analyzing trace with hash 1578058973, now seen corresponding path program 51 times [2018-10-27 15:42:47,001 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:47,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:47,002 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:47,002 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:47,002 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:47,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:48,130 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 15:42:48,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:48,130 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:48,131 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:48,131 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:48,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:48,131 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 15:42:48,138 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:48,138 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:48,165 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:48,166 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:48,168 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:48,202 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 15:42:48,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:51,084 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 15:42:51,104 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:51,104 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 106 [2018-10-27 15:42:51,105 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:51,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 15:42:51,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 15:42:51,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-10-27 15:42:51,107 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 54 states. [2018-10-27 15:42:51,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:51,291 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-10-27 15:42:51,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-27 15:42:51,292 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 164 [2018-10-27 15:42:51,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:51,293 INFO L225 Difference]: With dead ends: 174 [2018-10-27 15:42:51,293 INFO L226 Difference]: Without dead ends: 169 [2018-10-27 15:42:51,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5565, Invalid=5565, Unknown=0, NotChecked=0, Total=11130 [2018-10-27 15:42:51,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-27 15:42:51,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2018-10-27 15:42:51,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-27 15:42:51,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-10-27 15:42:51,297 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 164 [2018-10-27 15:42:51,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:51,297 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-10-27 15:42:51,297 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 15:42:51,297 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-10-27 15:42:51,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-27 15:42:51,298 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:51,298 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:51,298 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:51,298 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:51,299 INFO L82 PathProgramCache]: Analyzing trace with hash -30166055, now seen corresponding path program 52 times [2018-10-27 15:42:51,299 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:51,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:51,299 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:51,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:51,299 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:51,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:53,498 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 15:42:53,498 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:53,498 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:53,498 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:53,499 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:53,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:53,499 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 15:42:53,506 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:53,507 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:53,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:53,538 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:53,576 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 15:42:53,576 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:56,728 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 15:42:56,748 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:56,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 108 [2018-10-27 15:42:56,749 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:56,749 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-27 15:42:56,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-27 15:42:56,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2018-10-27 15:42:56,751 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 55 states. [2018-10-27 15:42:56,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:56,999 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-10-27 15:42:56,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 15:42:56,999 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 167 [2018-10-27 15:42:57,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:57,001 INFO L225 Difference]: With dead ends: 177 [2018-10-27 15:42:57,001 INFO L226 Difference]: Without dead ends: 172 [2018-10-27 15:42:57,002 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=5778, Invalid=5778, Unknown=0, NotChecked=0, Total=11556 [2018-10-27 15:42:57,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-27 15:42:57,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-27 15:42:57,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-27 15:42:57,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-10-27 15:42:57,005 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 167 [2018-10-27 15:42:57,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:57,005 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-10-27 15:42:57,005 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-27 15:42:57,006 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-10-27 15:42:57,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-27 15:42:57,007 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:57,007 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:57,007 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:57,007 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:57,007 INFO L82 PathProgramCache]: Analyzing trace with hash -301788323, now seen corresponding path program 53 times [2018-10-27 15:42:57,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:57,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:57,008 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:57,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:57,008 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:57,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:59,203 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 15:42:59,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:59,203 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:59,203 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:59,203 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:59,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:59,203 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 15:42:59,212 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:59,212 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:59,267 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-10-27 15:42:59,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:59,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:59,306 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 15:42:59,306 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:02,538 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 15:43:02,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:02,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-27 15:43:02,558 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:02,559 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-27 15:43:02,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-27 15:43:02,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 15:43:02,560 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 56 states. [2018-10-27 15:43:02,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:02,717 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-10-27 15:43:02,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-27 15:43:02,717 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 170 [2018-10-27 15:43:02,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:02,718 INFO L225 Difference]: With dead ends: 180 [2018-10-27 15:43:02,719 INFO L226 Difference]: Without dead ends: 175 [2018-10-27 15:43:02,720 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=5995, Invalid=5995, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 15:43:02,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-27 15:43:02,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2018-10-27 15:43:02,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-27 15:43:02,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-10-27 15:43:02,722 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 170 [2018-10-27 15:43:02,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:02,723 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-10-27 15:43:02,723 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-27 15:43:02,723 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-10-27 15:43:02,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-27 15:43:02,723 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:02,723 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:02,724 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:02,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:02,724 INFO L82 PathProgramCache]: Analyzing trace with hash -482388647, now seen corresponding path program 54 times [2018-10-27 15:43:02,724 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:02,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:02,725 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:02,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:02,725 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:02,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:04,004 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 15:43:04,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:04,005 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:04,005 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:04,005 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:04,005 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:04,005 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 15:43:04,013 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:43:04,013 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:43:04,056 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:43:04,056 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:04,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:04,100 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 15:43:04,100 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:07,606 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 15:43:07,626 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:07,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 112 [2018-10-27 15:43:07,627 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:07,627 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 15:43:07,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 15:43:07,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-10-27 15:43:07,628 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 57 states. [2018-10-27 15:43:07,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:07,822 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-10-27 15:43:07,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-27 15:43:07,822 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 173 [2018-10-27 15:43:07,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:07,823 INFO L225 Difference]: With dead ends: 183 [2018-10-27 15:43:07,823 INFO L226 Difference]: Without dead ends: 178 [2018-10-27 15:43:07,823 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=6216, Invalid=6216, Unknown=0, NotChecked=0, Total=12432 [2018-10-27 15:43:07,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-27 15:43:07,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-10-27 15:43:07,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-27 15:43:07,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2018-10-27 15:43:07,828 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 173 [2018-10-27 15:43:07,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:07,828 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2018-10-27 15:43:07,828 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 15:43:07,828 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2018-10-27 15:43:07,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-27 15:43:07,829 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:07,829 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:07,830 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:07,830 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:07,830 INFO L82 PathProgramCache]: Analyzing trace with hash 847380957, now seen corresponding path program 55 times [2018-10-27 15:43:07,830 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:07,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:07,831 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:07,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:07,831 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:07,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:09,517 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 15:43:09,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:09,518 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:09,518 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:09,518 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:09,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:09,518 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 15:43:09,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:09,525 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:43:09,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:09,557 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:09,595 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 15:43:09,596 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:12,915 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 15:43:12,934 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:12,935 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 114 [2018-10-27 15:43:12,935 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:12,935 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-27 15:43:12,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-27 15:43:12,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6441, Invalid=6441, Unknown=0, NotChecked=0, Total=12882 [2018-10-27 15:43:12,936 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 58 states. [2018-10-27 15:43:13,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:13,168 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-10-27 15:43:13,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-27 15:43:13,169 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 176 [2018-10-27 15:43:13,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:13,170 INFO L225 Difference]: With dead ends: 186 [2018-10-27 15:43:13,170 INFO L226 Difference]: Without dead ends: 181 [2018-10-27 15:43:13,171 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6441, Invalid=6441, Unknown=0, NotChecked=0, Total=12882 [2018-10-27 15:43:13,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-27 15:43:13,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2018-10-27 15:43:13,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-27 15:43:13,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-10-27 15:43:13,175 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 176 [2018-10-27 15:43:13,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:13,175 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-10-27 15:43:13,175 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-27 15:43:13,176 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-10-27 15:43:13,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-27 15:43:13,176 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:13,177 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:13,177 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:13,177 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:13,177 INFO L82 PathProgramCache]: Analyzing trace with hash -764684583, now seen corresponding path program 56 times [2018-10-27 15:43:13,177 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:13,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:13,178 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:13,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:13,178 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:13,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:15,207 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 15:43:15,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:15,207 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:15,207 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:15,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:15,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:15,207 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 15:43:15,218 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:43:15,218 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:43:15,274 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2018-10-27 15:43:15,274 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:15,277 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:15,315 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 15:43:15,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:18,698 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 15:43:18,719 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:18,719 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-27 15:43:18,719 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:18,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-27 15:43:18,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-27 15:43:18,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-10-27 15:43:18,721 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 59 states. [2018-10-27 15:43:18,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:18,953 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-10-27 15:43:18,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-27 15:43:18,954 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 179 [2018-10-27 15:43:18,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:18,955 INFO L225 Difference]: With dead ends: 189 [2018-10-27 15:43:18,955 INFO L226 Difference]: Without dead ends: 184 [2018-10-27 15:43:18,956 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 302 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=6670, Invalid=6670, Unknown=0, NotChecked=0, Total=13340 [2018-10-27 15:43:18,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-27 15:43:18,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-10-27 15:43:18,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-27 15:43:18,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-10-27 15:43:18,960 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 179 [2018-10-27 15:43:18,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:18,960 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-10-27 15:43:18,960 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-27 15:43:18,960 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-10-27 15:43:18,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-27 15:43:18,961 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:18,961 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:18,962 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:18,962 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:18,962 INFO L82 PathProgramCache]: Analyzing trace with hash 515117149, now seen corresponding path program 57 times [2018-10-27 15:43:18,962 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:18,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:18,963 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:18,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:18,963 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:18,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:20,348 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 15:43:20,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:20,348 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:20,348 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:20,348 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:20,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:20,348 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 15:43:20,355 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:43:20,356 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:43:20,393 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:43:20,393 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:20,396 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:20,437 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 15:43:20,438 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:23,985 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 15:43:24,005 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:24,005 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-10-27 15:43:24,005 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:24,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-27 15:43:24,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-27 15:43:24,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-10-27 15:43:24,007 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 60 states. [2018-10-27 15:43:24,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:24,233 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-10-27 15:43:24,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-27 15:43:24,233 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 182 [2018-10-27 15:43:24,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:24,234 INFO L225 Difference]: With dead ends: 192 [2018-10-27 15:43:24,234 INFO L226 Difference]: Without dead ends: 187 [2018-10-27 15:43:24,235 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 307 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=6903, Invalid=6903, Unknown=0, NotChecked=0, Total=13806 [2018-10-27 15:43:24,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-27 15:43:24,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-27 15:43:24,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-27 15:43:24,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-10-27 15:43:24,239 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 182 [2018-10-27 15:43:24,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:24,239 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-10-27 15:43:24,239 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-27 15:43:24,239 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-10-27 15:43:24,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-27 15:43:24,240 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:24,240 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:24,241 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:24,241 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:24,241 INFO L82 PathProgramCache]: Analyzing trace with hash 663828569, now seen corresponding path program 58 times [2018-10-27 15:43:24,241 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:24,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:24,242 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:24,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:24,242 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:24,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:25,554 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 15:43:25,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:25,555 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:25,555 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:25,555 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:25,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:25,555 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 15:43:25,563 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:25,563 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:43:25,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:25,603 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:25,661 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 15:43:25,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:29,369 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 15:43:29,389 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:29,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 120 [2018-10-27 15:43:29,389 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:29,389 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-27 15:43:29,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-27 15:43:29,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7140, Invalid=7140, Unknown=0, NotChecked=0, Total=14280 [2018-10-27 15:43:29,390 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 61 states. [2018-10-27 15:43:29,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:29,589 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-10-27 15:43:29,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-27 15:43:29,590 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 185 [2018-10-27 15:43:29,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:29,591 INFO L225 Difference]: With dead ends: 195 [2018-10-27 15:43:29,592 INFO L226 Difference]: Without dead ends: 190 [2018-10-27 15:43:29,593 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 312 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=7140, Invalid=7140, Unknown=0, NotChecked=0, Total=14280 [2018-10-27 15:43:29,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-10-27 15:43:29,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-10-27 15:43:29,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-27 15:43:29,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2018-10-27 15:43:29,596 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 185 [2018-10-27 15:43:29,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:29,597 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2018-10-27 15:43:29,597 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-27 15:43:29,597 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2018-10-27 15:43:29,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-10-27 15:43:29,598 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:29,598 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:29,598 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:29,598 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:29,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1480507683, now seen corresponding path program 59 times [2018-10-27 15:43:29,599 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:29,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:29,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:29,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:29,600 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:29,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:30,931 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 15:43:30,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:30,931 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:30,931 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:30,931 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:30,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:30,931 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 15:43:30,939 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:43:30,939 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:43:30,998 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2018-10-27 15:43:30,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:31,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:31,041 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 15:43:31,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:34,839 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 15:43:34,859 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:34,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-27 15:43:34,860 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:34,860 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-27 15:43:34,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-27 15:43:34,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-10-27 15:43:34,861 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 62 states. [2018-10-27 15:43:35,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:35,094 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-10-27 15:43:35,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-27 15:43:35,094 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 188 [2018-10-27 15:43:35,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:35,095 INFO L225 Difference]: With dead ends: 198 [2018-10-27 15:43:35,095 INFO L226 Difference]: Without dead ends: 193 [2018-10-27 15:43:35,096 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 317 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=7381, Invalid=7381, Unknown=0, NotChecked=0, Total=14762 [2018-10-27 15:43:35,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-27 15:43:35,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-27 15:43:35,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-27 15:43:35,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-10-27 15:43:35,100 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 188 [2018-10-27 15:43:35,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:35,100 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-10-27 15:43:35,100 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-27 15:43:35,100 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-10-27 15:43:35,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-27 15:43:35,101 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:35,101 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:35,101 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:35,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:35,102 INFO L82 PathProgramCache]: Analyzing trace with hash -58230311, now seen corresponding path program 60 times [2018-10-27 15:43:35,102 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:35,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:35,102 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:35,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:35,102 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:35,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:36,480 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 15:43:36,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:36,481 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:36,481 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:36,481 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:36,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:36,481 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 15:43:36,488 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:43:36,489 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:43:36,516 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:43:36,516 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:36,519 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:36,551 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 15:43:36,551 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:40,380 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 15:43:40,399 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:40,399 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 124 [2018-10-27 15:43:40,400 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:40,400 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-27 15:43:40,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-27 15:43:40,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-10-27 15:43:40,401 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 63 states. [2018-10-27 15:43:41,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:41,636 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-10-27 15:43:41,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-27 15:43:41,636 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 191 [2018-10-27 15:43:41,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:41,637 INFO L225 Difference]: With dead ends: 201 [2018-10-27 15:43:41,638 INFO L226 Difference]: Without dead ends: 196 [2018-10-27 15:43:41,639 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=7626, Invalid=7626, Unknown=0, NotChecked=0, Total=15252 [2018-10-27 15:43:41,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-27 15:43:41,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-27 15:43:41,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-27 15:43:41,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-10-27 15:43:41,642 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 191 [2018-10-27 15:43:41,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:41,643 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-10-27 15:43:41,643 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-27 15:43:41,643 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-10-27 15:43:41,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-27 15:43:41,644 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:41,644 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:41,644 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:41,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:41,645 INFO L82 PathProgramCache]: Analyzing trace with hash 1154583901, now seen corresponding path program 61 times [2018-10-27 15:43:41,645 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:41,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:41,646 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:41,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:41,646 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:41,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:43,556 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 15:43:43,556 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:43,557 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:43,557 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:43,557 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:43,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:43,557 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 15:43:43,565 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:43,565 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:43:43,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:43,598 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:43,631 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 15:43:43,631 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:47,627 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 15:43:47,647 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:47,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 126 [2018-10-27 15:43:47,647 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:47,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-27 15:43:47,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-27 15:43:47,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7875, Invalid=7875, Unknown=0, NotChecked=0, Total=15750 [2018-10-27 15:43:47,650 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 64 states. [2018-10-27 15:43:47,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:47,960 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-10-27 15:43:47,960 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-27 15:43:47,960 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 194 [2018-10-27 15:43:47,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:47,961 INFO L225 Difference]: With dead ends: 204 [2018-10-27 15:43:47,961 INFO L226 Difference]: Without dead ends: 199 [2018-10-27 15:43:47,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 451 GetRequests, 327 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=7875, Invalid=7875, Unknown=0, NotChecked=0, Total=15750 [2018-10-27 15:43:47,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-27 15:43:47,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-27 15:43:47,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-27 15:43:47,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-10-27 15:43:47,966 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 194 [2018-10-27 15:43:47,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:47,966 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-10-27 15:43:47,966 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-27 15:43:47,966 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-10-27 15:43:47,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-27 15:43:47,967 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:47,967 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:47,968 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:47,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:47,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1457087655, now seen corresponding path program 62 times [2018-10-27 15:43:47,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:47,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:47,969 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:47,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:47,969 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:47,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:49,687 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 15:43:49,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:49,687 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:49,687 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:49,688 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:49,688 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:49,688 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 15:43:49,696 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:43:49,697 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:43:49,760 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2018-10-27 15:43:49,760 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:49,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:49,796 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 15:43:49,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:53,888 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 15:43:53,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:53,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-27 15:43:53,909 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:53,909 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-27 15:43:53,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-27 15:43:53,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-10-27 15:43:53,911 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 65 states. [2018-10-27 15:43:54,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:54,186 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-10-27 15:43:54,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-27 15:43:54,186 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 197 [2018-10-27 15:43:54,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:54,187 INFO L225 Difference]: With dead ends: 207 [2018-10-27 15:43:54,187 INFO L226 Difference]: Without dead ends: 202 [2018-10-27 15:43:54,188 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=8128, Invalid=8128, Unknown=0, NotChecked=0, Total=16256 [2018-10-27 15:43:54,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-27 15:43:54,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-10-27 15:43:54,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-27 15:43:54,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2018-10-27 15:43:54,193 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 197 [2018-10-27 15:43:54,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:54,193 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2018-10-27 15:43:54,193 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-27 15:43:54,193 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2018-10-27 15:43:54,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-27 15:43:54,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:54,195 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:54,195 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:54,195 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:54,195 INFO L82 PathProgramCache]: Analyzing trace with hash 1863121885, now seen corresponding path program 63 times [2018-10-27 15:43:54,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:54,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:54,196 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:54,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:54,196 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:54,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:55,737 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 15:43:55,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:55,738 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:55,738 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:55,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:55,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:55,738 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 15:43:55,747 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:43:55,747 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:43:55,776 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:43:55,776 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:55,780 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:55,826 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 15:43:55,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:01,229 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 15:44:01,248 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:01,248 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 130 [2018-10-27 15:44:01,248 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:01,249 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-27 15:44:01,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-27 15:44:01,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-10-27 15:44:01,250 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 66 states. [2018-10-27 15:44:01,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:01,530 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-10-27 15:44:01,530 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-27 15:44:01,530 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 200 [2018-10-27 15:44:01,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:01,531 INFO L225 Difference]: With dead ends: 210 [2018-10-27 15:44:01,531 INFO L226 Difference]: Without dead ends: 205 [2018-10-27 15:44:01,532 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 337 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=8385, Invalid=8385, Unknown=0, NotChecked=0, Total=16770 [2018-10-27 15:44:01,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-27 15:44:01,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-10-27 15:44:01,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-27 15:44:01,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2018-10-27 15:44:01,535 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 200 [2018-10-27 15:44:01,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:01,535 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2018-10-27 15:44:01,536 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-27 15:44:01,536 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2018-10-27 15:44:01,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-27 15:44:01,537 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:01,537 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:01,537 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:01,537 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:01,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1128701145, now seen corresponding path program 64 times [2018-10-27 15:44:01,537 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:01,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:01,538 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:01,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:01,538 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:01,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:03,071 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 15:44:03,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:03,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:03,071 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:03,071 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:03,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:03,072 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 15:44:03,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:03,079 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:44:03,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:03,114 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:03,150 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 15:44:03,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:07,468 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 15:44:07,487 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:07,487 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 132 [2018-10-27 15:44:07,487 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:07,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-27 15:44:07,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-27 15:44:07,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8646, Invalid=8646, Unknown=0, NotChecked=0, Total=17292 [2018-10-27 15:44:07,489 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 67 states. [2018-10-27 15:44:07,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:07,695 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-10-27 15:44:07,696 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-27 15:44:07,696 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 203 [2018-10-27 15:44:07,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:07,697 INFO L225 Difference]: With dead ends: 213 [2018-10-27 15:44:07,697 INFO L226 Difference]: Without dead ends: 208 [2018-10-27 15:44:07,698 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=8646, Invalid=8646, Unknown=0, NotChecked=0, Total=17292 [2018-10-27 15:44:07,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-27 15:44:07,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-10-27 15:44:07,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-27 15:44:07,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-10-27 15:44:07,702 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 203 [2018-10-27 15:44:07,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:07,702 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-10-27 15:44:07,702 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-27 15:44:07,702 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-10-27 15:44:07,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-27 15:44:07,703 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:07,703 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:07,703 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:07,703 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:07,703 INFO L82 PathProgramCache]: Analyzing trace with hash 563841629, now seen corresponding path program 65 times [2018-10-27 15:44:07,703 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:07,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:07,704 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:07,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:07,704 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:07,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:09,326 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 15:44:09,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:09,327 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:09,327 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:09,327 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:09,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:09,327 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 15:44:09,334 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:44:09,334 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:44:09,400 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2018-10-27 15:44:09,400 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:09,403 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:09,440 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 15:44:09,440 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:13,899 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 15:44:13,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:13,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-27 15:44:13,919 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:13,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-27 15:44:13,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-27 15:44:13,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-10-27 15:44:13,920 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 68 states. [2018-10-27 15:44:14,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:14,121 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-10-27 15:44:14,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-27 15:44:14,122 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 206 [2018-10-27 15:44:14,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:14,123 INFO L225 Difference]: With dead ends: 216 [2018-10-27 15:44:14,123 INFO L226 Difference]: Without dead ends: 211 [2018-10-27 15:44:14,124 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 479 GetRequests, 347 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2018-10-27 15:44:14,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-27 15:44:14,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-10-27 15:44:14,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-27 15:44:14,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 210 transitions. [2018-10-27 15:44:14,128 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 210 transitions. Word has length 206 [2018-10-27 15:44:14,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:14,128 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 210 transitions. [2018-10-27 15:44:14,128 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-27 15:44:14,128 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 210 transitions. [2018-10-27 15:44:14,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-27 15:44:14,129 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:14,130 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:14,130 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:14,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:14,130 INFO L82 PathProgramCache]: Analyzing trace with hash 515866201, now seen corresponding path program 66 times [2018-10-27 15:44:14,130 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:14,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:14,131 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:14,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:14,131 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:14,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:15,743 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 15:44:15,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:15,743 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:15,743 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:15,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:15,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:15,744 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 15:44:15,750 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:44:15,751 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:44:15,782 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:44:15,783 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:15,785 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:15,832 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 15:44:15,832 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:20,395 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 15:44:20,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:20,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 136 [2018-10-27 15:44:20,415 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:20,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-27 15:44:20,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-27 15:44:20,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-10-27 15:44:20,417 INFO L87 Difference]: Start difference. First operand 210 states and 210 transitions. Second operand 69 states. [2018-10-27 15:44:20,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:20,647 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-10-27 15:44:20,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-27 15:44:20,648 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 209 [2018-10-27 15:44:20,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:20,649 INFO L225 Difference]: With dead ends: 219 [2018-10-27 15:44:20,649 INFO L226 Difference]: Without dead ends: 214 [2018-10-27 15:44:20,650 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 352 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=9180, Invalid=9180, Unknown=0, NotChecked=0, Total=18360 [2018-10-27 15:44:20,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-27 15:44:20,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-27 15:44:20,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-27 15:44:20,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 213 transitions. [2018-10-27 15:44:20,655 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 213 transitions. Word has length 209 [2018-10-27 15:44:20,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:20,655 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 213 transitions. [2018-10-27 15:44:20,655 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-27 15:44:20,655 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 213 transitions. [2018-10-27 15:44:20,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-27 15:44:20,656 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:20,656 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:20,657 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:20,657 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:20,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1504000221, now seen corresponding path program 67 times [2018-10-27 15:44:20,657 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:20,657 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:20,658 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:20,658 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:20,658 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:20,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:22,407 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 15:44:22,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:22,407 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:22,407 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:22,407 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:22,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:22,407 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 15:44:22,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:22,417 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:44:22,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:22,452 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:22,490 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 15:44:22,490 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:27,168 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 15:44:27,188 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:27,188 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 138 [2018-10-27 15:44:27,188 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:27,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-27 15:44:27,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-27 15:44:27,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9453, Invalid=9453, Unknown=0, NotChecked=0, Total=18906 [2018-10-27 15:44:27,190 INFO L87 Difference]: Start difference. First operand 213 states and 213 transitions. Second operand 70 states. [2018-10-27 15:44:27,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:27,480 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2018-10-27 15:44:27,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-27 15:44:27,480 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 212 [2018-10-27 15:44:27,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:27,481 INFO L225 Difference]: With dead ends: 222 [2018-10-27 15:44:27,481 INFO L226 Difference]: Without dead ends: 217 [2018-10-27 15:44:27,482 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 357 SyntacticMatches, 0 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=9453, Invalid=9453, Unknown=0, NotChecked=0, Total=18906 [2018-10-27 15:44:27,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-27 15:44:27,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 216. [2018-10-27 15:44:27,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-10-27 15:44:27,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 216 transitions. [2018-10-27 15:44:27,486 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 216 transitions. Word has length 212 [2018-10-27 15:44:27,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:27,486 INFO L481 AbstractCegarLoop]: Abstraction has 216 states and 216 transitions. [2018-10-27 15:44:27,486 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-27 15:44:27,486 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 216 transitions. [2018-10-27 15:44:27,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-27 15:44:27,487 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:27,488 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:27,488 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:27,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:27,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1298743257, now seen corresponding path program 68 times [2018-10-27 15:44:27,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:27,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:27,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:27,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:27,489 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:27,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:29,306 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 15:44:29,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:29,307 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:29,307 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:29,307 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:29,307 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:29,307 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 15:44:29,315 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:44:29,315 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:44:29,384 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-10-27 15:44:29,384 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:29,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:29,425 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 15:44:29,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:34,303 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 15:44:34,323 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:34,323 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-27 15:44:34,324 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:34,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-27 15:44:34,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-27 15:44:34,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-10-27 15:44:34,325 INFO L87 Difference]: Start difference. First operand 216 states and 216 transitions. Second operand 71 states. [2018-10-27 15:44:34,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:34,566 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2018-10-27 15:44:34,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-27 15:44:34,567 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 215 [2018-10-27 15:44:34,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:34,568 INFO L225 Difference]: With dead ends: 225 [2018-10-27 15:44:34,568 INFO L226 Difference]: Without dead ends: 220 [2018-10-27 15:44:34,568 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 362 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=9730, Invalid=9730, Unknown=0, NotChecked=0, Total=19460 [2018-10-27 15:44:34,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-27 15:44:34,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 219. [2018-10-27 15:44:34,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-27 15:44:34,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 219 transitions. [2018-10-27 15:44:34,572 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 219 transitions. Word has length 215 [2018-10-27 15:44:34,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:34,572 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 219 transitions. [2018-10-27 15:44:34,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-27 15:44:34,572 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 219 transitions. [2018-10-27 15:44:34,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-10-27 15:44:34,573 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:34,573 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:34,573 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:34,573 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:34,573 INFO L82 PathProgramCache]: Analyzing trace with hash -1773009059, now seen corresponding path program 69 times [2018-10-27 15:44:34,573 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:34,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:34,574 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:34,574 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:34,574 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:34,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:36,348 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 15:44:36,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:36,349 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:36,349 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:36,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:36,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:36,349 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 15:44:36,357 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:44:36,357 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:44:36,389 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:44:36,389 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:36,392 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:36,432 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 15:44:36,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:41,437 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 15:44:41,457 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:41,457 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 142 [2018-10-27 15:44:41,457 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:41,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-27 15:44:41,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-27 15:44:41,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10011, Invalid=10011, Unknown=0, NotChecked=0, Total=20022 [2018-10-27 15:44:41,459 INFO L87 Difference]: Start difference. First operand 219 states and 219 transitions. Second operand 72 states. [2018-10-27 15:44:41,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:41,690 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2018-10-27 15:44:41,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-27 15:44:41,690 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 218 [2018-10-27 15:44:41,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:41,692 INFO L225 Difference]: With dead ends: 228 [2018-10-27 15:44:41,692 INFO L226 Difference]: Without dead ends: 223 [2018-10-27 15:44:41,693 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=10011, Invalid=10011, Unknown=0, NotChecked=0, Total=20022 [2018-10-27 15:44:41,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-27 15:44:41,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2018-10-27 15:44:41,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-27 15:44:41,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 222 transitions. [2018-10-27 15:44:41,696 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 222 transitions. Word has length 218 [2018-10-27 15:44:41,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:41,696 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 222 transitions. [2018-10-27 15:44:41,696 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-27 15:44:41,696 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 222 transitions. [2018-10-27 15:44:41,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-27 15:44:41,697 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:41,697 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:41,697 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:41,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:41,697 INFO L82 PathProgramCache]: Analyzing trace with hash 521920857, now seen corresponding path program 70 times [2018-10-27 15:44:41,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:41,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:41,698 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:41,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:41,698 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:41,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:43,522 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 15:44:43,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:43,523 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:43,523 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:43,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:43,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:43,523 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 15:44:43,530 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:43,530 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:44:43,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:43,568 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:43,609 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 15:44:43,609 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:48,846 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 15:44:48,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:48,867 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 144 [2018-10-27 15:44:48,867 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:48,867 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-27 15:44:48,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-27 15:44:48,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10296, Invalid=10296, Unknown=0, NotChecked=0, Total=20592 [2018-10-27 15:44:48,868 INFO L87 Difference]: Start difference. First operand 222 states and 222 transitions. Second operand 73 states. [2018-10-27 15:44:49,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:49,102 INFO L93 Difference]: Finished difference Result 231 states and 231 transitions. [2018-10-27 15:44:49,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-27 15:44:49,103 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 221 [2018-10-27 15:44:49,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:49,104 INFO L225 Difference]: With dead ends: 231 [2018-10-27 15:44:49,104 INFO L226 Difference]: Without dead ends: 226 [2018-10-27 15:44:49,105 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 372 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=10296, Invalid=10296, Unknown=0, NotChecked=0, Total=20592 [2018-10-27 15:44:49,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-10-27 15:44:49,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 225. [2018-10-27 15:44:49,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-10-27 15:44:49,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 225 transitions. [2018-10-27 15:44:49,108 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 225 transitions. Word has length 221 [2018-10-27 15:44:49,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:49,108 INFO L481 AbstractCegarLoop]: Abstraction has 225 states and 225 transitions. [2018-10-27 15:44:49,108 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-27 15:44:49,108 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 225 transitions. [2018-10-27 15:44:49,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-27 15:44:49,109 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:49,109 INFO L375 BasicCegarLoop]: trace histogram [72, 71, 71, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:49,109 INFO L424 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:49,109 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:49,110 INFO L82 PathProgramCache]: Analyzing trace with hash 1489630685, now seen corresponding path program 71 times [2018-10-27 15:44:49,110 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:49,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:49,110 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:49,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:49,110 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:49,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:51,387 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:51,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:51,387 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:51,387 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:51,387 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:51,387 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:51,388 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:51,394 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:44:51,394 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:44:51,468 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 72 check-sat command(s) [2018-10-27 15:44:51,468 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:51,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:51,512 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:51,512 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-27 15:44:54,878 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-27 15:44:55,078 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:55,079 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 15:44:55,084 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 15:44:55,085 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 03:44:55 BoogieIcfgContainer [2018-10-27 15:44:55,085 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 15:44:55,085 INFO L168 Benchmark]: Toolchain (without parser) took 232519.91 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 669.0 MB). Free memory was 1.4 GB in the beginning and 1.7 GB in the end (delta: -307.7 MB). Peak memory consumption was 361.3 MB. Max. memory is 7.1 GB. [2018-10-27 15:44:55,087 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:44:55,087 INFO L168 Benchmark]: CACSL2BoogieTranslator took 294.72 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-27 15:44:55,088 INFO L168 Benchmark]: Boogie Procedure Inliner took 18.44 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:44:55,088 INFO L168 Benchmark]: Boogie Preprocessor took 20.83 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-27 15:44:55,088 INFO L168 Benchmark]: RCFGBuilder took 319.84 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 751.3 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -804.2 MB). Peak memory consumption was 26.7 MB. Max. memory is 7.1 GB. [2018-10-27 15:44:55,089 INFO L168 Benchmark]: TraceAbstraction took 231862.05 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -82.3 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 485.9 MB). Peak memory consumption was 403.6 MB. Max. memory is 7.1 GB. [2018-10-27 15:44:55,091 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 294.72 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 18.44 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 20.83 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 319.84 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 751.3 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -804.2 MB). Peak memory consumption was 26.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 231862.05 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -82.3 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 485.9 MB). Peak memory consumption was 403.6 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 225 with TraceHistMax 72,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, 231.7s OverallTime, 73 OverallIterations, 72 TraceHistogramMax, 12.3s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 801 SDtfs, 2556 SDslu, 16900 SDs, 0 SdLazy, 7047 SolverSat, 109 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 8.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19080 GetRequests, 13969 SyntacticMatches, 0 SemanticMatches, 5111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 201.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=225occurred in iteration=72, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 72 MinimizatonAttempts, 71 StatesRemovedByMinimization, 71 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 2.5s SatisfiabilityAnalysisTime, 206.5s InterpolantComputationTime, 16471 NumberOfCodeBlocks, 16471 NumberOfCodeBlocksAsserted, 970 NumberOfCheckSat, 24484 ConstructedInterpolants, 0 QuantifiedInterpolants, 10474076 SizeOfPredicates, 70 NumberOfNonLiveVariables, 11550 ConjunctsInSsa, 2625 ConjunctsInUnsatCore, 212 InterpolantComputations, 2 PerfectInterpolantSequences, 0/529305 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown