java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 04:06:22,289 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 04:06:22,291 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 04:06:22,304 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 04:06:22,304 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 04:06:22,305 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 04:06:22,306 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 04:06:22,308 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 04:06:22,310 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 04:06:22,311 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 04:06:22,312 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 04:06:22,312 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 04:06:22,313 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 04:06:22,314 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 04:06:22,315 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 04:06:22,316 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 04:06:22,317 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 04:06:22,319 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 04:06:22,320 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 04:06:22,322 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 04:06:22,323 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 04:06:22,324 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 04:06:22,326 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 04:06:22,327 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 04:06:22,327 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 04:06:22,328 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 04:06:22,329 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 04:06:22,330 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 04:06:22,331 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 04:06:22,332 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 04:06:22,332 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 04:06:22,333 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 04:06:22,333 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 04:06:22,333 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 04:06:22,334 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 04:06:22,336 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 04:06:22,336 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-27 04:06:22,353 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 04:06:22,353 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 04:06:22,354 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 04:06:22,354 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 04:06:22,354 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 04:06:22,355 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 04:06:22,355 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 04:06:22,355 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 04:06:22,355 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 04:06:22,355 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 04:06:22,356 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 04:06:22,356 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 04:06:22,356 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 04:06:22,357 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 04:06:22,357 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 04:06:22,357 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 04:06:22,357 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 04:06:22,357 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 04:06:22,358 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 04:06:22,358 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 04:06:22,358 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 04:06:22,358 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 04:06:22,358 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 04:06:22,359 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 04:06:22,359 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:06:22,359 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 04:06:22,359 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 04:06:22,359 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 04:06:22,360 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 04:06:22,360 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 04:06:22,360 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 04:06:22,360 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 04:06:22,361 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 04:06:22,361 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 04:06:22,407 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 04:06:22,421 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 04:06:22,426 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 04:06:22,427 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 04:06:22,428 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 04:06:22,428 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-10-27 04:06:22,488 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b09770806/b9dd17f0e3514f5f868b6d281e58dfd1/FLAG831589faa [2018-10-27 04:06:22,969 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 04:06:22,969 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call1.i [2018-10-27 04:06:22,976 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b09770806/b9dd17f0e3514f5f868b6d281e58dfd1/FLAG831589faa [2018-10-27 04:06:22,991 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/b09770806/b9dd17f0e3514f5f868b6d281e58dfd1 [2018-10-27 04:06:23,003 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 04:06:23,005 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 04:06:23,006 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 04:06:23,006 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 04:06:23,010 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 04:06:23,011 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:06:22" (1/1) ... [2018-10-27 04:06:23,014 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e34a1a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23, skipping insertion in model container [2018-10-27 04:06:23,014 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:06:22" (1/1) ... [2018-10-27 04:06:23,025 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 04:06:23,047 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 04:06:23,263 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:06:23,268 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 04:06:23,288 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:06:23,306 INFO L193 MainTranslator]: Completed translation [2018-10-27 04:06:23,307 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23 WrapperNode [2018-10-27 04:06:23,307 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 04:06:23,308 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 04:06:23,308 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 04:06:23,308 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 04:06:23,319 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (1/1) ... [2018-10-27 04:06:23,325 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (1/1) ... [2018-10-27 04:06:23,332 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 04:06:23,332 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 04:06:23,333 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 04:06:23,333 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 04:06:23,343 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (1/1) ... [2018-10-27 04:06:23,344 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (1/1) ... [2018-10-27 04:06:23,344 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (1/1) ... [2018-10-27 04:06:23,345 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (1/1) ... [2018-10-27 04:06:23,348 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (1/1) ... [2018-10-27 04:06:23,355 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (1/1) ... [2018-10-27 04:06:23,356 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (1/1) ... [2018-10-27 04:06:23,358 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 04:06:23,359 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 04:06:23,359 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 04:06:23,359 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 04:06:23,360 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (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 04:06:23,484 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 04:06:23,484 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 04:06:23,484 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 04:06:23,485 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 04:06:23,485 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 04:06:23,485 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 04:06:23,485 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 04:06:23,485 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 04:06:23,687 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 04:06:23,688 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:06:23 BoogieIcfgContainer [2018-10-27 04:06:23,689 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 04:06:23,690 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 04:06:23,690 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 04:06:23,693 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 04:06:23,694 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 04:06:22" (1/3) ... [2018-10-27 04:06:23,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e653c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:06:23, skipping insertion in model container [2018-10-27 04:06:23,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:06:23" (2/3) ... [2018-10-27 04:06:23,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e653c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:06:23, skipping insertion in model container [2018-10-27 04:06:23,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:06:23" (3/3) ... [2018-10-27 04:06:23,697 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call1.i [2018-10-27 04:06:23,708 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 04:06:23,716 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 04:06:23,734 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 04:06:23,768 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 04:06:23,768 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 04:06:23,769 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 04:06:23,769 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 04:06:23,769 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 04:06:23,769 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 04:06:23,769 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 04:06:23,769 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 04:06:23,786 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-27 04:06:23,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 04:06:23,792 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:23,793 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:23,796 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:23,801 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:23,801 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-10-27 04:06:23,803 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:23,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:23,853 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:23,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:23,854 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:23,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:23,913 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 04:06:23,915 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:06:23,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 04:06:23,916 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:06:23,920 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 04:06:23,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 04:06:23,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:06:23,936 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-27 04:06:23,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:23,957 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-27 04:06:23,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 04:06:23,958 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 04:06:23,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:23,967 INFO L225 Difference]: With dead ends: 29 [2018-10-27 04:06:23,968 INFO L226 Difference]: Without dead ends: 12 [2018-10-27 04:06:23,971 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 04:06:23,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-27 04:06:24,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-27 04:06:24,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-27 04:06:24,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-27 04:06:24,008 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-27 04:06:24,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:24,008 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-27 04:06:24,008 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 04:06:24,009 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-27 04:06:24,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 04:06:24,009 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:24,010 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:24,010 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:24,010 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:24,011 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-10-27 04:06:24,011 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:24,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:24,012 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:24,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:24,013 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:24,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:24,205 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 04:06:24,205 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:06:24,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 04:06:24,206 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:06:24,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 04:06:24,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 04:06:24,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:06:24,209 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-10-27 04:06:24,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:24,292 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-27 04:06:24,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 04:06:24,293 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 04:06:24,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:24,294 INFO L225 Difference]: With dead ends: 19 [2018-10-27 04:06:24,294 INFO L226 Difference]: Without dead ends: 14 [2018-10-27 04:06:24,296 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:06:24,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-27 04:06:24,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-27 04:06:24,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-27 04:06:24,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-27 04:06:24,304 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-27 04:06:24,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:24,305 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-27 04:06:24,305 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 04:06:24,305 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-27 04:06:24,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 04:06:24,309 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:24,309 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:24,309 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:24,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:24,310 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-10-27 04:06:24,310 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:24,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:24,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:24,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:24,316 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:24,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:24,554 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 04:06:24,554 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:24,554 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:24,555 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-27 04:06:24,557 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-10-27 04:06:24,604 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:06:24,604 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:06:24,705 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 04:06:25,079 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:06:25,080 INFO L272 AbstractInterpreter]: Visited 12 different actions 74 times. Merged at 3 different actions 28 times. Widened at 1 different actions 6 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-27 04:06:25,115 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:25,116 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:06:25,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:25,117 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 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 04:06:25,129 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:25,129 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:25,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:25,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:25,221 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 04:06:25,221 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:25,347 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 04:06:25,369 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:25,370 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 04:06:25,370 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:25,370 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 04:06:25,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 04:06:25,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:06:25,372 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-10-27 04:06:25,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:25,413 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 04:06:25,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 04:06:25,414 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-27 04:06:25,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:25,415 INFO L225 Difference]: With dead ends: 21 [2018-10-27 04:06:25,415 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 04:06:25,419 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 04:06:25,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 04:06:25,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-27 04:06:25,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-27 04:06:25,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-27 04:06:25,429 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-27 04:06:25,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:25,429 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-27 04:06:25,429 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 04:06:25,430 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-27 04:06:25,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 04:06:25,430 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:25,431 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:25,431 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:25,431 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:25,431 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-10-27 04:06:25,432 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:25,432 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:25,433 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:25,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:25,433 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:25,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:25,604 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:25,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:25,605 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:25,605 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:25,605 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:25,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:25,606 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 04:06:25,615 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:25,615 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:25,640 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 04:06:25,640 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:25,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:25,664 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:25,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:26,017 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:26,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:26,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 04:06:26,041 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:26,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 04:06:26,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 04:06:26,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 04:06:26,042 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-10-27 04:06:26,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:26,079 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-27 04:06:26,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 04:06:26,080 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-27 04:06:26,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:26,082 INFO L225 Difference]: With dead ends: 23 [2018-10-27 04:06:26,082 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 04:06:26,083 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 04:06:26,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 04:06:26,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 04:06:26,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 04:06:26,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-27 04:06:26,088 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-27 04:06:26,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:26,089 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-27 04:06:26,089 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 04:06:26,089 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-27 04:06:26,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 04:06:26,090 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:26,090 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:26,091 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:26,091 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:26,091 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-10-27 04:06:26,091 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:26,092 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:26,092 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:26,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:26,093 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:26,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:26,237 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:26,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:26,237 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:26,238 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:26,238 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:26,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:26,238 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 04:06:26,246 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:26,246 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:26,263 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:26,264 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:26,267 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:26,310 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:26,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:26,520 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:26,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:26,541 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 04:06:26,541 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:26,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 04:06:26,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 04:06:26,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 04:06:26,543 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-10-27 04:06:26,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:26,593 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-27 04:06:26,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 04:06:26,593 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-10-27 04:06:26,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:26,594 INFO L225 Difference]: With dead ends: 25 [2018-10-27 04:06:26,594 INFO L226 Difference]: Without dead ends: 20 [2018-10-27 04:06:26,596 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 04:06:26,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-27 04:06:26,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-27 04:06:26,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 04:06:26,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-27 04:06:26,600 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-27 04:06:26,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:26,601 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-27 04:06:26,601 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 04:06:26,601 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-27 04:06:26,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-27 04:06:26,602 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:26,602 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:26,603 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:26,603 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:26,603 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-10-27 04:06:26,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:26,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:26,605 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:26,605 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:26,605 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:26,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:26,823 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:26,823 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:26,823 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:26,824 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:26,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:26,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:26,824 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 04:06:26,834 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:26,835 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:26,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:26,852 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:26,871 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:26,871 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:27,341 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:27,363 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:27,363 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 04:06:27,363 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:27,364 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 04:06:27,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 04:06:27,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 04:06:27,365 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-10-27 04:06:27,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:27,429 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 04:06:27,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 04:06:27,430 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-27 04:06:27,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:27,432 INFO L225 Difference]: With dead ends: 27 [2018-10-27 04:06:27,432 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 04:06:27,433 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 04:06:27,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 04:06:27,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-27 04:06:27,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-27 04:06:27,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-27 04:06:27,438 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-27 04:06:27,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:27,439 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-27 04:06:27,439 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 04:06:27,439 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-27 04:06:27,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 04:06:27,439 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:27,440 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:27,440 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:27,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:27,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-10-27 04:06:27,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:27,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:27,441 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:27,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:27,442 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:27,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:27,649 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:27,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:27,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:27,649 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:27,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:27,650 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:27,650 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 04:06:27,657 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:27,657 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:27,681 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 04:06:27,681 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:27,684 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:27,701 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:27,701 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:27,916 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:27,937 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:27,938 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 04:06:27,938 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:27,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 04:06:27,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 04:06:27,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:06:27,939 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-10-27 04:06:28,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:28,031 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-27 04:06:28,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 04:06:28,034 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-27 04:06:28,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:28,035 INFO L225 Difference]: With dead ends: 29 [2018-10-27 04:06:28,035 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 04:06:28,035 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 04:06:28,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 04:06:28,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-27 04:06:28,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 04:06:28,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-27 04:06:28,040 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-27 04:06:28,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:28,041 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-27 04:06:28,041 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 04:06:28,041 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-27 04:06:28,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 04:06:28,042 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:28,042 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:28,042 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:28,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:28,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-10-27 04:06:28,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:28,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:28,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:28,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:28,044 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:28,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:28,257 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:28,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:28,258 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:28,258 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:28,258 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:28,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:28,258 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 04:06:28,266 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:28,266 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:28,277 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:28,277 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:28,280 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:28,298 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:28,298 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:28,546 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:28,578 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:28,578 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 04:06:28,578 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:28,579 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 04:06:28,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 04:06:28,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 04:06:28,580 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-27 04:06:28,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:28,653 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-27 04:06:28,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 04:06:28,655 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-27 04:06:28,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:28,656 INFO L225 Difference]: With dead ends: 31 [2018-10-27 04:06:28,656 INFO L226 Difference]: Without dead ends: 26 [2018-10-27 04:06:28,657 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 04:06:28,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-27 04:06:28,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-27 04:06:28,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 04:06:28,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-27 04:06:28,663 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-27 04:06:28,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:28,664 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-27 04:06:28,664 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 04:06:28,664 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-27 04:06:28,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 04:06:28,665 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:28,665 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:28,665 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:28,665 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:28,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-10-27 04:06:28,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:28,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:28,667 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:28,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:28,667 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:28,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:28,823 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:28,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:28,824 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:28,824 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:28,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:28,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:28,824 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 04:06:28,832 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:28,832 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:28,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:28,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:28,920 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:28,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:29,233 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:29,255 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:29,256 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 04:06:29,256 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:29,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 04:06:29,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 04:06:29,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 04:06:29,257 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-10-27 04:06:29,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:29,390 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 04:06:29,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 04:06:29,394 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-10-27 04:06:29,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:29,395 INFO L225 Difference]: With dead ends: 33 [2018-10-27 04:06:29,395 INFO L226 Difference]: Without dead ends: 28 [2018-10-27 04:06:29,396 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 04:06:29,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-27 04:06:29,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-27 04:06:29,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-27 04:06:29,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-27 04:06:29,400 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-27 04:06:29,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:29,401 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-27 04:06:29,401 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 04:06:29,401 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-27 04:06:29,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-27 04:06:29,402 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:29,402 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:29,402 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:29,403 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:29,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-10-27 04:06:29,403 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:29,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:29,404 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:29,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:29,404 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:29,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:29,579 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:29,579 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:29,580 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:29,580 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:29,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:29,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:29,580 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 04:06:29,590 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:29,591 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:30,332 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 04:06:30,332 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:30,347 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:30,368 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:30,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:30,690 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:30,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:30,712 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 04:06:30,712 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:30,712 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 04:06:30,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 04:06:30,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 04:06:30,713 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-10-27 04:06:30,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:30,810 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-27 04:06:30,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 04:06:30,814 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-10-27 04:06:30,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:30,815 INFO L225 Difference]: With dead ends: 35 [2018-10-27 04:06:30,815 INFO L226 Difference]: Without dead ends: 30 [2018-10-27 04:06:30,816 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 04:06:30,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-27 04:06:30,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-27 04:06:30,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 04:06:30,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-27 04:06:30,821 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-27 04:06:30,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:30,821 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-27 04:06:30,821 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 04:06:30,822 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-27 04:06:30,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 04:06:30,823 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:30,823 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:30,823 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:30,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:30,823 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-10-27 04:06:30,824 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:30,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:30,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:30,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:30,825 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:30,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:31,144 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:31,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:31,145 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:31,145 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:31,146 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:31,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:31,146 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 04:06:31,154 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:06:31,154 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:06:31,165 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:06:31,166 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:31,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:31,180 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:31,181 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:31,494 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:31,515 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:31,516 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 04:06:31,516 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:31,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 04:06:31,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 04:06:31,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 04:06:31,518 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-10-27 04:06:31,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:31,692 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-27 04:06:31,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 04:06:31,694 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-10-27 04:06:31,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:31,695 INFO L225 Difference]: With dead ends: 37 [2018-10-27 04:06:31,695 INFO L226 Difference]: Without dead ends: 32 [2018-10-27 04:06:31,696 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 04:06:31,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-27 04:06:31,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-27 04:06:31,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-27 04:06:31,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-27 04:06:31,702 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-27 04:06:31,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:31,702 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-27 04:06:31,703 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 04:06:31,703 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-27 04:06:31,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-27 04:06:31,704 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:31,704 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:31,704 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:31,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:31,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-10-27 04:06:31,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:31,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:31,706 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:06:31,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:31,706 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:31,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:31,977 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:31,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:31,977 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:31,977 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:31,978 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:31,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:31,978 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 04:06:31,986 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:31,986 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:06:32,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:32,009 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:06:32,038 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:32,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:06:32,518 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:32,539 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:06:32,539 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 04:06:32,539 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:06:32,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 04:06:32,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 04:06:32,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 04:06:32,541 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-10-27 04:06:32,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:06:32,657 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 04:06:32,658 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 04:06:32,658 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-10-27 04:06:32,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:06:32,659 INFO L225 Difference]: With dead ends: 39 [2018-10-27 04:06:32,659 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 04:06:32,661 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 04:06:32,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 04:06:32,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-27 04:06:32,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-27 04:06:32,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-27 04:06:32,667 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-27 04:06:32,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:06:32,667 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-27 04:06:32,667 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 04:06:32,668 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-27 04:06:32,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-27 04:06:32,668 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:06:32,669 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:06:32,669 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:06:32,669 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:06:32,669 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-10-27 04:06:32,669 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:06:32,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:32,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:06:32,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:06:32,671 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:06:32,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:06:32,944 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:06:32,944 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:32,944 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:06:32,944 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:06:32,945 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:06:32,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:06:32,945 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 04:06:32,952 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:06:32,952 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:06:59,963 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 04:06:59,963 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:06:59,993 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:00,055 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:00,056 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:00,748 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:00,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:00,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 04:07:00,770 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:00,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 04:07:00,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 04:07:00,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 04:07:00,772 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-10-27 04:07:00,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:00,961 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-27 04:07:00,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 04:07:00,964 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-10-27 04:07:00,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:00,965 INFO L225 Difference]: With dead ends: 41 [2018-10-27 04:07:00,965 INFO L226 Difference]: Without dead ends: 36 [2018-10-27 04:07:00,966 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 04:07:00,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-27 04:07:00,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-27 04:07:00,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 04:07:00,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-27 04:07:00,970 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-27 04:07:00,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:00,971 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-27 04:07:00,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 04:07:00,971 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-27 04:07:00,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 04:07:00,972 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:00,972 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:00,973 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:00,973 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:00,973 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-10-27 04:07:00,973 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:00,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:00,974 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:00,974 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:00,974 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:00,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:01,329 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:01,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:01,329 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:01,329 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:01,329 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:01,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:01,329 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 04:07:01,337 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:07:01,337 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:07:01,349 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:07:01,349 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:01,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:01,370 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:01,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:02,041 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:02,071 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:02,071 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 04:07:02,071 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:02,072 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 04:07:02,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 04:07:02,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-27 04:07:02,072 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-10-27 04:07:02,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:02,259 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-27 04:07:02,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 04:07:02,259 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-10-27 04:07:02,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:02,261 INFO L225 Difference]: With dead ends: 43 [2018-10-27 04:07:02,261 INFO L226 Difference]: Without dead ends: 38 [2018-10-27 04:07:02,262 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-27 04:07:02,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-27 04:07:02,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-27 04:07:02,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-27 04:07:02,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-27 04:07:02,267 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-27 04:07:02,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:02,267 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-27 04:07:02,268 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 04:07:02,268 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-27 04:07:02,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-27 04:07:02,269 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:02,269 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:02,269 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:02,269 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:02,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-10-27 04:07:02,270 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:02,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:02,271 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:02,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:02,271 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:02,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:02,600 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:02,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:02,600 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:02,600 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:02,601 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:02,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:02,601 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 04:07:02,608 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:02,608 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:07:02,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:02,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:02,657 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:02,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:03,329 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:03,350 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:03,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 04:07:03,351 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:03,351 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 04:07:03,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 04:07:03,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-27 04:07:03,352 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-10-27 04:07:03,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:03,740 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 04:07:03,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 04:07:03,740 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-10-27 04:07:03,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:03,742 INFO L225 Difference]: With dead ends: 45 [2018-10-27 04:07:03,742 INFO L226 Difference]: Without dead ends: 40 [2018-10-27 04:07:03,743 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-27 04:07:03,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-27 04:07:03,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-27 04:07:03,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-27 04:07:03,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-27 04:07:03,748 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-27 04:07:03,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:03,748 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-27 04:07:03,748 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 04:07:03,748 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-27 04:07:03,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-27 04:07:03,749 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:03,749 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:03,750 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:03,750 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:03,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-10-27 04:07:03,750 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:03,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:03,751 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:03,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:03,751 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:03,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:04,614 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:04,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:04,615 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:04,615 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:04,615 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:04,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:04,615 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 04:07:04,628 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:07:04,628 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:07:31,292 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 04:07:31,293 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:31,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:31,335 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:31,337 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:32,165 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:32,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:32,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 04:07:32,186 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:32,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 04:07:32,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 04:07:32,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-27 04:07:32,188 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-10-27 04:07:32,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:32,366 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-10-27 04:07:32,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 04:07:32,366 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-10-27 04:07:32,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:32,367 INFO L225 Difference]: With dead ends: 47 [2018-10-27 04:07:32,367 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 04:07:32,368 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-27 04:07:32,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 04:07:32,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-27 04:07:32,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 04:07:32,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-27 04:07:32,374 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-27 04:07:32,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:32,374 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-27 04:07:32,374 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 04:07:32,374 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-27 04:07:32,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 04:07:32,375 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:32,375 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:32,375 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:32,376 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:32,376 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-10-27 04:07:32,376 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:32,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:32,377 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:32,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:32,377 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:32,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:32,768 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:32,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:32,769 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:32,769 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:32,769 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:32,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:32,769 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 04:07:32,778 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:07:32,778 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:07:32,800 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:07:32,801 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:32,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:32,824 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:32,824 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:33,707 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:33,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:33,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 04:07:33,727 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:33,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 04:07:33,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 04:07:33,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 04:07:33,729 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-10-27 04:07:33,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:33,937 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-27 04:07:33,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 04:07:33,938 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-10-27 04:07:33,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:33,938 INFO L225 Difference]: With dead ends: 49 [2018-10-27 04:07:33,938 INFO L226 Difference]: Without dead ends: 44 [2018-10-27 04:07:33,939 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 04:07:33,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-27 04:07:33,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-27 04:07:33,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-27 04:07:33,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-27 04:07:33,944 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-27 04:07:33,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:33,945 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-27 04:07:33,945 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 04:07:33,945 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-27 04:07:33,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-27 04:07:33,945 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:33,946 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:33,946 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:33,946 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:33,946 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-10-27 04:07:33,946 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:33,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:33,947 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:33,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:33,947 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:33,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:34,227 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:34,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:34,228 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:34,228 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:34,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:34,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:34,228 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 04:07:34,235 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:34,236 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:07:34,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:34,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:34,273 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:34,274 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:35,164 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:35,185 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:35,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 04:07:35,186 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:35,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 04:07:35,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 04:07:35,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 04:07:35,187 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-10-27 04:07:35,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:35,572 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 04:07:35,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 04:07:35,574 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-10-27 04:07:35,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:35,575 INFO L225 Difference]: With dead ends: 51 [2018-10-27 04:07:35,575 INFO L226 Difference]: Without dead ends: 46 [2018-10-27 04:07:35,576 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 04:07:35,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-27 04:07:35,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-27 04:07:35,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-27 04:07:35,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-27 04:07:35,581 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-27 04:07:35,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:35,581 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-27 04:07:35,581 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 04:07:35,581 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-27 04:07:35,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 04:07:35,582 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:35,582 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:35,582 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:35,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:35,583 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-10-27 04:07:35,583 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:35,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:35,583 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:07:35,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:35,584 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:35,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:35,926 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:35,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:35,926 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:35,926 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:35,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:35,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:35,927 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 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 04:07:35,934 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:07:35,934 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:07:57,230 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 04:07:57,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:57,556 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:57,582 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:57,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:07:58,519 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:58,540 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:07:58,540 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 04:07:58,540 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:07:58,540 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 04:07:58,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 04:07:58,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 04:07:58,542 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 20 states. [2018-10-27 04:07:59,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:07:59,064 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-10-27 04:07:59,064 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 04:07:59,064 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-10-27 04:07:59,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:07:59,065 INFO L225 Difference]: With dead ends: 53 [2018-10-27 04:07:59,066 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 04:07:59,067 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 04:07:59,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 04:07:59,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-27 04:07:59,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 04:07:59,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-27 04:07:59,071 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-27 04:07:59,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:07:59,071 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-27 04:07:59,071 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 04:07:59,072 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-27 04:07:59,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 04:07:59,072 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:07:59,072 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:07:59,073 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:07:59,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:07:59,073 INFO L82 PathProgramCache]: Analyzing trace with hash 723901956, now seen corresponding path program 18 times [2018-10-27 04:07:59,073 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:07:59,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:59,074 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:07:59,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:07:59,074 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:07:59,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:07:59,891 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:59,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:59,891 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:07:59,891 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:07:59,892 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:07:59,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:07:59,892 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 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 04:07:59,899 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:07:59,899 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:07:59,915 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:07:59,915 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:07:59,919 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:07:59,938 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:07:59,938 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:01,327 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:01,347 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:01,347 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 04:08:01,348 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:01,348 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 04:08:01,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 04:08:01,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 04:08:01,349 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 21 states. [2018-10-27 04:08:01,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:01,745 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-27 04:08:01,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 04:08:01,745 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2018-10-27 04:08:01,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:01,746 INFO L225 Difference]: With dead ends: 55 [2018-10-27 04:08:01,747 INFO L226 Difference]: Without dead ends: 50 [2018-10-27 04:08:01,748 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 04:08:01,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-27 04:08:01,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-27 04:08:01,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-27 04:08:01,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-27 04:08:01,756 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-10-27 04:08:01,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:01,756 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-27 04:08:01,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 04:08:01,757 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-27 04:08:01,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-27 04:08:01,758 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:01,758 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:01,759 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:01,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:01,759 INFO L82 PathProgramCache]: Analyzing trace with hash 880063306, now seen corresponding path program 19 times [2018-10-27 04:08:01,759 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:01,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:01,760 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:08:01,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:01,760 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:01,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:02,112 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:02,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:02,112 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:02,112 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:02,112 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:02,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:02,112 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 04:08:02,120 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:08:02,120 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:08:02,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:02,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:08:02,171 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:02,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:08:03,715 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:03,736 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:08:03,736 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 04:08:03,736 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:08:03,736 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 04:08:03,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 04:08:03,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 04:08:03,737 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 22 states. [2018-10-27 04:08:04,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:08:04,146 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 04:08:04,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 04:08:04,146 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-10-27 04:08:04,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:08:04,147 INFO L225 Difference]: With dead ends: 57 [2018-10-27 04:08:04,148 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 04:08:04,149 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 04:08:04,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 04:08:04,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-27 04:08:04,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-27 04:08:04,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-27 04:08:04,154 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-10-27 04:08:04,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:08:04,155 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-27 04:08:04,155 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 04:08:04,155 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-27 04:08:04,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-27 04:08:04,155 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:08:04,156 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:08:04,156 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:08:04,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:08:04,156 INFO L82 PathProgramCache]: Analyzing trace with hash 627265296, now seen corresponding path program 20 times [2018-10-27 04:08:04,156 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:08:04,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:04,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:08:04,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:08:04,158 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:08:04,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:08:04,924 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:08:04,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:04,924 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:08:04,924 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:08:04,924 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:08:04,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:08:04,924 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 04:08:04,932 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:08:04,932 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:10:20,546 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 04:10:20,546 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:10:20,577 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:10:20,607 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:10:20,607 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:10:22,470 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:10:22,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:10:22,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 04:10:22,491 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:10:22,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 04:10:22,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 04:10:22,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 04:10:22,493 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 23 states. [2018-10-27 04:10:22,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:10:22,852 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-10-27 04:10:22,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 04:10:22,855 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2018-10-27 04:10:22,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:10:22,856 INFO L225 Difference]: With dead ends: 59 [2018-10-27 04:10:22,856 INFO L226 Difference]: Without dead ends: 54 [2018-10-27 04:10:22,857 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 04:10:22,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-27 04:10:22,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-27 04:10:22,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 04:10:22,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-27 04:10:22,862 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-10-27 04:10:22,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:10:22,862 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-27 04:10:22,862 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 04:10:22,862 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-27 04:10:22,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 04:10:22,863 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:10:22,863 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:10:22,863 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:10:22,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:10:22,863 INFO L82 PathProgramCache]: Analyzing trace with hash -1793453738, now seen corresponding path program 21 times [2018-10-27 04:10:22,864 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:10:22,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:22,864 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:10:22,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:22,865 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:10:22,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:10:24,511 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:10:24,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:24,511 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:10:24,511 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:10:24,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:10:24,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:24,512 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 04:10:24,520 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:10:24,520 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:10:24,538 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:10:24,538 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:10:24,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:10:24,550 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:10:24,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:10:26,054 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:10:26,074 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:10:26,074 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-27 04:10:26,074 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:10:26,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 04:10:26,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 04:10:26,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 04:10:26,075 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 24 states. [2018-10-27 04:10:26,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:10:26,415 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-27 04:10:26,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 04:10:26,415 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2018-10-27 04:10:26,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:10:26,416 INFO L225 Difference]: With dead ends: 61 [2018-10-27 04:10:26,416 INFO L226 Difference]: Without dead ends: 56 [2018-10-27 04:10:26,418 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 04:10:26,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-27 04:10:26,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-10-27 04:10:26,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-27 04:10:26,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-27 04:10:26,423 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-10-27 04:10:26,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:10:26,423 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-27 04:10:26,423 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 04:10:26,423 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-27 04:10:26,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-27 04:10:26,424 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:10:26,424 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:10:26,424 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:10:26,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:10:26,424 INFO L82 PathProgramCache]: Analyzing trace with hash -232170980, now seen corresponding path program 22 times [2018-10-27 04:10:26,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:10:26,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:26,425 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:10:26,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:26,425 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:10:26,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:10:26,924 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:10:26,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:26,925 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:10:26,925 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:10:26,925 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:10:26,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:26,925 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 04:10:26,934 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:10:26,934 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:10:26,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:10:26,953 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:10:26,985 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:10:26,985 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:10:28,636 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:10:28,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:10:28,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-27 04:10:28,657 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:10:28,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 04:10:28,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 04:10:28,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 04:10:28,659 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 25 states. [2018-10-27 04:10:29,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:10:29,032 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-27 04:10:29,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 04:10:29,032 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2018-10-27 04:10:29,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:10:29,033 INFO L225 Difference]: With dead ends: 63 [2018-10-27 04:10:29,033 INFO L226 Difference]: Without dead ends: 58 [2018-10-27 04:10:29,035 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 87 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 04:10:29,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-27 04:10:29,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-10-27 04:10:29,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-27 04:10:29,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-10-27 04:10:29,039 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 55 [2018-10-27 04:10:29,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:10:29,039 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-10-27 04:10:29,039 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 04:10:29,039 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-10-27 04:10:29,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-27 04:10:29,040 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:10:29,040 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:10:29,040 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:10:29,040 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:10:29,041 INFO L82 PathProgramCache]: Analyzing trace with hash 1216973154, now seen corresponding path program 23 times [2018-10-27 04:10:29,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:10:29,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:29,041 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:10:29,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:10:29,042 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:10:29,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:10:29,735 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:10:29,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:29,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:10:29,735 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:10:29,735 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:10:29,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:10:29,735 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 04:10:29,743 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:10:29,744 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown