./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_8_true-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_8_true-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cd6d4490a7412402195d3193de0347508566f7c8 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-5842f4b [2018-11-18 16:47:44,245 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 16:47:44,246 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 16:47:44,254 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 16:47:44,255 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 16:47:44,255 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 16:47:44,256 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 16:47:44,258 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 16:47:44,259 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 16:47:44,260 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 16:47:44,261 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 16:47:44,261 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 16:47:44,262 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 16:47:44,262 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 16:47:44,263 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 16:47:44,264 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 16:47:44,264 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 16:47:44,265 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 16:47:44,267 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 16:47:44,268 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 16:47:44,269 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 16:47:44,270 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 16:47:44,272 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 16:47:44,272 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 16:47:44,272 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 16:47:44,273 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 16:47:44,274 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 16:47:44,274 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 16:47:44,275 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 16:47:44,275 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 16:47:44,275 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 16:47:44,276 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 16:47:44,276 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 16:47:44,276 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 16:47:44,276 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 16:47:44,277 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 16:47:44,277 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-18 16:47:44,286 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 16:47:44,286 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 16:47:44,287 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 16:47:44,287 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-18 16:47:44,288 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-18 16:47:44,288 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-18 16:47:44,288 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-18 16:47:44,288 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-18 16:47:44,288 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-18 16:47:44,288 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-18 16:47:44,289 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-18 16:47:44,289 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-18 16:47:44,289 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-18 16:47:44,290 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 16:47:44,290 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 16:47:44,290 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 16:47:44,290 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 16:47:44,290 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 16:47:44,290 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 16:47:44,291 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 16:47:44,291 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 16:47:44,291 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 16:47:44,291 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 16:47:44,291 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 16:47:44,291 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 16:47:44,292 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 16:47:44,292 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 16:47:44,292 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 16:47:44,292 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 16:47:44,292 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 16:47:44,292 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 16:47:44,293 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 16:47:44,293 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 16:47:44,293 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-18 16:47:44,293 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 16:47:44,293 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 16:47:44,293 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-18 16:47:44,294 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cd6d4490a7412402195d3193de0347508566f7c8 [2018-11-18 16:47:44,322 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 16:47:44,333 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 16:47:44,336 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 16:47:44,338 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 16:47:44,338 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 16:47:44,339 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/fibo_2calls_8_true-unreach-call_true-termination.c [2018-11-18 16:47:44,394 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/data/6905bb2d7/20fa0a886e244a9d829640a795fe84f1/FLAG86c04336d [2018-11-18 16:47:44,748 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 16:47:44,749 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/sv-benchmarks/c/recursive-simple/fibo_2calls_8_true-unreach-call_true-termination.c [2018-11-18 16:47:44,755 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/data/6905bb2d7/20fa0a886e244a9d829640a795fe84f1/FLAG86c04336d [2018-11-18 16:47:44,767 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/data/6905bb2d7/20fa0a886e244a9d829640a795fe84f1 [2018-11-18 16:47:44,770 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 16:47:44,771 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-18 16:47:44,771 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 16:47:44,771 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 16:47:44,774 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 16:47:44,775 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,777 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@300c35c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44, skipping insertion in model container [2018-11-18 16:47:44,777 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,785 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 16:47:44,799 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 16:47:44,935 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 16:47:44,939 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 16:47:44,951 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 16:47:44,962 INFO L195 MainTranslator]: Completed translation [2018-11-18 16:47:44,962 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44 WrapperNode [2018-11-18 16:47:44,962 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 16:47:44,963 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-18 16:47:44,963 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-18 16:47:44,963 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-18 16:47:44,970 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,974 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,980 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-18 16:47:44,980 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 16:47:44,980 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 16:47:44,980 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 16:47:44,987 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,988 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,988 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,989 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,991 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,993 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,994 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (1/1) ... [2018-11-18 16:47:44,995 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 16:47:44,996 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 16:47:44,996 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 16:47:44,996 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 16:47:44,997 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:47:45,081 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 16:47:45,082 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 16:47:45,082 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 16:47:45,082 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 16:47:45,082 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 16:47:45,082 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 16:47:45,082 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2018-11-18 16:47:45,082 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2018-11-18 16:47:45,082 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2018-11-18 16:47:45,082 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2018-11-18 16:47:45,219 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 16:47:45,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 04:47:45 BoogieIcfgContainer [2018-11-18 16:47:45,220 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 16:47:45,221 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 16:47:45,221 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 16:47:45,224 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 16:47:45,224 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 04:47:44" (1/3) ... [2018-11-18 16:47:45,225 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e620e08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 04:47:45, skipping insertion in model container [2018-11-18 16:47:45,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 04:47:44" (2/3) ... [2018-11-18 16:47:45,225 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e620e08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 04:47:45, skipping insertion in model container [2018-11-18 16:47:45,225 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 04:47:45" (3/3) ... [2018-11-18 16:47:45,227 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_8_true-unreach-call_true-termination.c [2018-11-18 16:47:45,237 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 16:47:45,244 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 16:47:45,259 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 16:47:45,290 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 16:47:45,291 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 16:47:45,291 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 16:47:45,291 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 16:47:45,291 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 16:47:45,291 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 16:47:45,291 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 16:47:45,291 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 16:47:45,309 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2018-11-18 16:47:45,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-18 16:47:45,315 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:47:45,316 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:47:45,318 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:47:45,323 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:45,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2018-11-18 16:47:45,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:47:45,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:45,366 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:47:45,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:45,366 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:47:45,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:47:45,462 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 16:47:45,463 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 16:47:45,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-18 16:47:45,464 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 16:47:45,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 16:47:45,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 16:47:45,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 16:47:45,479 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2018-11-18 16:47:45,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:47:45,580 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2018-11-18 16:47:45,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 16:47:45,582 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-18 16:47:45,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:47:45,589 INFO L225 Difference]: With dead ends: 44 [2018-11-18 16:47:45,590 INFO L226 Difference]: Without dead ends: 30 [2018-11-18 16:47:45,592 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-18 16:47:45,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-18 16:47:45,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-11-18 16:47:45,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-18 16:47:45,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2018-11-18 16:47:45,625 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2018-11-18 16:47:45,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:47:45,626 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2018-11-18 16:47:45,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 16:47:45,626 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2018-11-18 16:47:45,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-18 16:47:45,627 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:47:45,628 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:47:45,628 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:47:45,628 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:45,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2018-11-18 16:47:45,628 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:47:45,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:45,629 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:47:45,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:45,630 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:47:45,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:47:45,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 16:47:45,687 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 16:47:45,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-18 16:47:45,691 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 16:47:45,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-18 16:47:45,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-18 16:47:45,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-18 16:47:45,693 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2018-11-18 16:47:45,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:47:45,784 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2018-11-18 16:47:45,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-18 16:47:45,785 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-11-18 16:47:45,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:47:45,786 INFO L225 Difference]: With dead ends: 36 [2018-11-18 16:47:45,786 INFO L226 Difference]: Without dead ends: 32 [2018-11-18 16:47:45,787 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-18 16:47:45,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-11-18 16:47:45,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2018-11-18 16:47:45,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-18 16:47:45,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2018-11-18 16:47:45,792 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2018-11-18 16:47:45,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:47:45,793 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2018-11-18 16:47:45,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-18 16:47:45,793 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2018-11-18 16:47:45,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-11-18 16:47:45,794 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:47:45,794 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:47:45,795 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:47:45,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:45,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2018-11-18 16:47:45,795 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:47:45,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:45,796 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:47:45,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:45,796 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:47:45,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:47:45,891 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-18 16:47:45,891 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:47:45,892 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:47:45,893 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 27 with the following transitions: [2018-11-18 16:47:45,895 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [31], [32], [36], [40], [42], [44], [45], [46], [47], [48], [50], [51], [56], [57], [58], [59] [2018-11-18 16:47:45,922 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 16:47:45,922 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 16:47:46,016 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-11-18 16:47:46,017 INFO L272 AbstractInterpreter]: Visited 12 different actions 12 times. Never merged. Never widened. Performed 15 root evaluator evaluations with a maximum evaluation depth of 3. Performed 15 inverse root evaluator evaluations with a maximum inverse evaluation depth of 3. Never found a fixpoint. Largest state had 5 variables. [2018-11-18 16:47:46,023 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:46,023 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-11-18 16:47:46,059 INFO L227 lantSequenceWeakener]: Weakened 4 states. On average, predicates are now at 50% of their original sizes. [2018-11-18 16:47:46,059 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-11-18 16:47:46,087 INFO L415 sIntCurrentIteration]: We unified 25 AI predicates to 25 [2018-11-18 16:47:46,087 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-11-18 16:47:46,088 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-11-18 16:47:46,088 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2018-11-18 16:47:46,088 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 16:47:46,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 16:47:46,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 16:47:46,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-11-18 16:47:46,089 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 7 states. [2018-11-18 16:47:46,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:47:46,265 INFO L93 Difference]: Finished difference Result 72 states and 95 transitions. [2018-11-18 16:47:46,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 16:47:46,265 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2018-11-18 16:47:46,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:47:46,267 INFO L225 Difference]: With dead ends: 72 [2018-11-18 16:47:46,267 INFO L226 Difference]: Without dead ends: 48 [2018-11-18 16:47:46,268 INFO L604 BasicCegarLoop]: 2 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2018-11-18 16:47:46,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-18 16:47:46,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2018-11-18 16:47:46,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-11-18 16:47:46,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2018-11-18 16:47:46,278 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 26 [2018-11-18 16:47:46,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:47:46,278 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2018-11-18 16:47:46,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 16:47:46,279 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2018-11-18 16:47:46,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-18 16:47:46,280 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:47:46,281 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:47:46,281 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:47:46,281 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:46,281 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2018-11-18 16:47:46,282 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:47:46,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:46,283 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:47:46,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:46,283 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:47:46,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:47:46,348 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-18 16:47:46,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:47:46,348 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:47:46,349 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-11-18 16:47:46,349 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [26], [28], [30], [31], [32], [35], [36], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2018-11-18 16:47:46,351 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 16:47:46,351 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 16:47:46,499 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-11-18 16:47:46,500 INFO L272 AbstractInterpreter]: Visited 28 different actions 313 times. Never merged. Widened at 2 different actions 18 times. Performed 647 root evaluator evaluations with a maximum evaluation depth of 4. Performed 647 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 29 fixpoints after 6 different actions. Largest state had 5 variables. [2018-11-18 16:47:46,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:46,510 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-11-18 16:47:46,528 INFO L227 lantSequenceWeakener]: Weakened 7 states. On average, predicates are now at 50% of their original sizes. [2018-11-18 16:47:46,528 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-11-18 16:47:46,579 INFO L415 sIntCurrentIteration]: We unified 38 AI predicates to 38 [2018-11-18 16:47:46,579 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-11-18 16:47:46,580 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-11-18 16:47:46,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [6] total 13 [2018-11-18 16:47:46,580 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 16:47:46,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-18 16:47:46,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-18 16:47:46,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-11-18 16:47:46,581 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 9 states. [2018-11-18 16:47:46,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:47:46,810 INFO L93 Difference]: Finished difference Result 87 states and 106 transitions. [2018-11-18 16:47:46,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-18 16:47:46,810 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 39 [2018-11-18 16:47:46,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:47:46,811 INFO L225 Difference]: With dead ends: 87 [2018-11-18 16:47:46,811 INFO L226 Difference]: Without dead ends: 55 [2018-11-18 16:47:46,812 INFO L604 BasicCegarLoop]: 2 DeclaredPredicates, 41 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2018-11-18 16:47:46,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-11-18 16:47:46,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-11-18 16:47:46,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-11-18 16:47:46,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2018-11-18 16:47:46,822 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 39 [2018-11-18 16:47:46,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:47:46,822 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2018-11-18 16:47:46,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-18 16:47:46,822 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2018-11-18 16:47:46,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-11-18 16:47:46,824 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:47:46,824 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:47:46,825 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:47:46,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:46,825 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2018-11-18 16:47:46,826 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:47:46,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:46,827 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:47:46,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:46,827 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:47:46,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:47:46,899 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-18 16:47:46,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:47:46,900 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:47:46,900 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:47:46,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:47:46,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:47:46,902 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:47:46,914 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 16:47:46,914 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 16:47:46,936 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-18 16:47:46,936 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:47:46,943 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:47:47,030 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-11-18 16:47:47,030 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:47:47,300 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 12 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-11-18 16:47:47,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:47:47,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 15 [2018-11-18 16:47:47,320 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:47:47,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-18 16:47:47,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-18 16:47:47,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2018-11-18 16:47:47,321 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 11 states. [2018-11-18 16:47:47,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:47:47,518 INFO L93 Difference]: Finished difference Result 121 states and 177 transitions. [2018-11-18 16:47:47,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-18 16:47:47,519 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 52 [2018-11-18 16:47:47,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:47:47,521 INFO L225 Difference]: With dead ends: 121 [2018-11-18 16:47:47,521 INFO L226 Difference]: Without dead ends: 76 [2018-11-18 16:47:47,521 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 92 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-11-18 16:47:47,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-11-18 16:47:47,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 59. [2018-11-18 16:47:47,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-11-18 16:47:47,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 70 transitions. [2018-11-18 16:47:47,530 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 70 transitions. Word has length 52 [2018-11-18 16:47:47,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:47:47,531 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 70 transitions. [2018-11-18 16:47:47,531 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-18 16:47:47,531 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 70 transitions. [2018-11-18 16:47:47,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-18 16:47:47,532 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:47:47,533 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:47:47,533 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:47:47,533 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:47,533 INFO L82 PathProgramCache]: Analyzing trace with hash -242988780, now seen corresponding path program 1 times [2018-11-18 16:47:47,533 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:47:47,534 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:47,534 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:47:47,534 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:47,534 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:47:47,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:47:47,593 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2018-11-18 16:47:47,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:47:47,594 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:47:47,594 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 56 with the following transitions: [2018-11-18 16:47:47,594 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [25], [26], [28], [30], [31], [32], [36], [39], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2018-11-18 16:47:47,595 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 16:47:47,595 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 16:47:48,843 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-11-18 16:47:48,843 INFO L272 AbstractInterpreter]: Visited 29 different actions 4700 times. Merged at 11 different actions 1218 times. Widened at 2 different actions 234 times. Performed 10886 root evaluator evaluations with a maximum evaluation depth of 4. Performed 10886 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 580 fixpoints after 9 different actions. Largest state had 5 variables. [2018-11-18 16:47:48,862 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:48,862 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-11-18 16:47:48,877 INFO L227 lantSequenceWeakener]: Weakened 11 states. On average, predicates are now at 50% of their original sizes. [2018-11-18 16:47:48,877 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-11-18 16:47:48,929 INFO L415 sIntCurrentIteration]: We unified 54 AI predicates to 54 [2018-11-18 16:47:48,929 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-11-18 16:47:48,930 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-11-18 16:47:48,930 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [11] imperfect sequences [7] total 16 [2018-11-18 16:47:48,930 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 16:47:48,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-18 16:47:48,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-18 16:47:48,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-11-18 16:47:48,931 INFO L87 Difference]: Start difference. First operand 59 states and 70 transitions. Second operand 11 states. [2018-11-18 16:47:49,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:47:49,282 INFO L93 Difference]: Finished difference Result 109 states and 136 transitions. [2018-11-18 16:47:49,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-18 16:47:49,282 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 55 [2018-11-18 16:47:49,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:47:49,285 INFO L225 Difference]: With dead ends: 109 [2018-11-18 16:47:49,289 INFO L226 Difference]: Without dead ends: 68 [2018-11-18 16:47:49,290 INFO L604 BasicCegarLoop]: 2 DeclaredPredicates, 58 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2018-11-18 16:47:49,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-11-18 16:47:49,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-11-18 16:47:49,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-11-18 16:47:49,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 82 transitions. [2018-11-18 16:47:49,299 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 82 transitions. Word has length 55 [2018-11-18 16:47:49,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:47:49,299 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 82 transitions. [2018-11-18 16:47:49,299 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-18 16:47:49,299 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 82 transitions. [2018-11-18 16:47:49,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-18 16:47:49,301 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:47:49,301 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:47:49,302 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:47:49,302 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:49,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1768644787, now seen corresponding path program 1 times [2018-11-18 16:47:49,302 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:47:49,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:49,303 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:47:49,303 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:47:49,303 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:47:49,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:47:49,363 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 16 proven. 15 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2018-11-18 16:47:49,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:47:49,364 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:47:49,364 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 68 with the following transitions: [2018-11-18 16:47:49,364 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [25], [26], [28], [30], [31], [32], [35], [36], [39], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2018-11-18 16:47:49,365 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 16:47:49,365 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 16:47:59,308 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-18 16:47:59,309 INFO L272 AbstractInterpreter]: Visited 34 different actions 66811 times. Merged at 16 different actions 20941 times. Widened at 4 different actions 2001 times. Performed 164403 root evaluator evaluations with a maximum evaluation depth of 4. Performed 164403 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 9083 fixpoints after 10 different actions. Largest state had 5 variables. [2018-11-18 16:47:59,310 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:47:59,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-18 16:47:59,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:47:59,310 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:47:59,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:47:59,318 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 16:47:59,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:47:59,345 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:47:59,417 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-11-18 16:47:59,418 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:47:59,937 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 8 proven. 48 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-11-18 16:47:59,968 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:47:59,968 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 13] total 18 [2018-11-18 16:47:59,969 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:47:59,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 16:47:59,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 16:47:59,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2018-11-18 16:47:59,970 INFO L87 Difference]: Start difference. First operand 68 states and 82 transitions. Second operand 12 states. [2018-11-18 16:48:00,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:00,232 INFO L93 Difference]: Finished difference Result 144 states and 218 transitions. [2018-11-18 16:48:00,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-18 16:48:00,233 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2018-11-18 16:48:00,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:00,235 INFO L225 Difference]: With dead ends: 144 [2018-11-18 16:48:00,235 INFO L226 Difference]: Without dead ends: 95 [2018-11-18 16:48:00,236 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 117 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=122, Invalid=528, Unknown=0, NotChecked=0, Total=650 [2018-11-18 16:48:00,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-11-18 16:48:00,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 70. [2018-11-18 16:48:00,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-11-18 16:48:00,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2018-11-18 16:48:00,249 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 67 [2018-11-18 16:48:00,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:00,249 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2018-11-18 16:48:00,249 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 16:48:00,250 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2018-11-18 16:48:00,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-11-18 16:48:00,251 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:00,251 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:00,252 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:00,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:00,252 INFO L82 PathProgramCache]: Analyzing trace with hash 650896746, now seen corresponding path program 1 times [2018-11-18 16:48:00,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:00,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:00,253 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:48:00,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:00,253 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:00,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:00,390 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 39 proven. 39 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2018-11-18 16:48:00,390 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:00,390 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:00,390 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 82 with the following transitions: [2018-11-18 16:48:00,391 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [18], [21], [22], [26], [28], [30], [31], [32], [35], [36], [39], [40], [42], [44], [45], [46], [47], [48], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59] [2018-11-18 16:48:00,392 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-18 16:48:00,392 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-18 16:48:00,839 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-11-18 16:48:00,840 INFO L272 AbstractInterpreter]: Visited 29 different actions 3227 times. Merged at 11 different actions 856 times. Widened at 2 different actions 130 times. Performed 7980 root evaluator evaluations with a maximum evaluation depth of 4. Performed 7980 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 384 fixpoints after 9 different actions. Largest state had 5 variables. [2018-11-18 16:48:00,841 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:00,841 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-11-18 16:48:00,858 INFO L227 lantSequenceWeakener]: Weakened 19 states. On average, predicates are now at 55.26% of their original sizes. [2018-11-18 16:48:00,859 INFO L413 sIntCurrentIteration]: Unifying AI predicates [2018-11-18 16:48:00,919 INFO L415 sIntCurrentIteration]: We unified 80 AI predicates to 80 [2018-11-18 16:48:00,919 INFO L424 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-11-18 16:48:00,919 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-11-18 16:48:00,919 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [15] imperfect sequences [11] total 24 [2018-11-18 16:48:00,919 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 16:48:00,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-18 16:48:00,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-18 16:48:00,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-11-18 16:48:00,920 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand 15 states. [2018-11-18 16:48:01,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:01,343 INFO L93 Difference]: Finished difference Result 136 states and 177 transitions. [2018-11-18 16:48:01,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-18 16:48:01,343 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 81 [2018-11-18 16:48:01,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:01,344 INFO L225 Difference]: With dead ends: 136 [2018-11-18 16:48:01,344 INFO L226 Difference]: Without dead ends: 88 [2018-11-18 16:48:01,345 INFO L604 BasicCegarLoop]: 2 DeclaredPredicates, 90 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=51, Invalid=369, Unknown=0, NotChecked=0, Total=420 [2018-11-18 16:48:01,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-11-18 16:48:01,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-11-18 16:48:01,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-11-18 16:48:01,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 109 transitions. [2018-11-18 16:48:01,352 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 109 transitions. Word has length 81 [2018-11-18 16:48:01,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:01,352 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 109 transitions. [2018-11-18 16:48:01,352 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-18 16:48:01,353 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 109 transitions. [2018-11-18 16:48:01,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-11-18 16:48:01,353 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:01,353 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:01,354 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:01,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:01,354 INFO L82 PathProgramCache]: Analyzing trace with hash -1708632044, now seen corresponding path program 2 times [2018-11-18 16:48:01,354 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:01,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:01,355 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:48:01,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:01,355 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:01,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:01,451 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 68 proven. 48 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2018-11-18 16:48:01,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:01,452 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:01,452 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:01,452 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:01,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:01,452 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:01,461 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 16:48:01,461 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 16:48:01,472 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-18 16:48:01,472 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:48:01,476 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:01,530 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 67 proven. 15 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2018-11-18 16:48:01,531 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:01,788 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 67 proven. 16 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2018-11-18 16:48:01,807 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:01,807 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 9] total 20 [2018-11-18 16:48:01,807 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:01,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 16:48:01,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 16:48:01,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2018-11-18 16:48:01,808 INFO L87 Difference]: Start difference. First operand 88 states and 109 transitions. Second operand 16 states. [2018-11-18 16:48:02,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:02,168 INFO L93 Difference]: Finished difference Result 218 states and 340 transitions. [2018-11-18 16:48:02,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-18 16:48:02,168 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2018-11-18 16:48:02,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:02,170 INFO L225 Difference]: With dead ends: 218 [2018-11-18 16:48:02,170 INFO L226 Difference]: Without dead ends: 147 [2018-11-18 16:48:02,171 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 202 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=174, Invalid=882, Unknown=0, NotChecked=0, Total=1056 [2018-11-18 16:48:02,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-11-18 16:48:02,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 117. [2018-11-18 16:48:02,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-11-18 16:48:02,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 166 transitions. [2018-11-18 16:48:02,185 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 166 transitions. Word has length 108 [2018-11-18 16:48:02,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:02,185 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 166 transitions. [2018-11-18 16:48:02,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 16:48:02,186 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 166 transitions. [2018-11-18 16:48:02,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-11-18 16:48:02,188 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:02,188 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 11, 11, 10, 9, 8, 8, 8, 8, 8, 8, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:02,188 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:02,188 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:02,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1764149606, now seen corresponding path program 3 times [2018-11-18 16:48:02,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:02,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:02,189 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:48:02,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:02,190 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:02,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:02,326 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 187 proven. 21 refuted. 0 times theorem prover too weak. 725 trivial. 0 not checked. [2018-11-18 16:48:02,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:02,327 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:02,327 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:02,327 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:02,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:02,327 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:02,335 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 16:48:02,336 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 16:48:02,373 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 16:48:02,373 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:48:02,378 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:02,492 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 55 proven. 281 refuted. 0 times theorem prover too weak. 597 trivial. 0 not checked. [2018-11-18 16:48:02,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:03,319 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 55 proven. 297 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-11-18 16:48:03,338 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:03,338 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 15] total 24 [2018-11-18 16:48:03,338 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:03,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-18 16:48:03,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-18 16:48:03,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=470, Unknown=0, NotChecked=0, Total=552 [2018-11-18 16:48:03,339 INFO L87 Difference]: Start difference. First operand 117 states and 166 transitions. Second operand 17 states. [2018-11-18 16:48:03,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:03,775 INFO L93 Difference]: Finished difference Result 319 states and 576 transitions. [2018-11-18 16:48:03,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-18 16:48:03,776 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 188 [2018-11-18 16:48:03,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:03,779 INFO L225 Difference]: With dead ends: 319 [2018-11-18 16:48:03,780 INFO L226 Difference]: Without dead ends: 194 [2018-11-18 16:48:03,781 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 350 SyntacticMatches, 12 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=226, Invalid=1106, Unknown=0, NotChecked=0, Total=1332 [2018-11-18 16:48:03,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-11-18 16:48:03,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 135. [2018-11-18 16:48:03,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-11-18 16:48:03,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 198 transitions. [2018-11-18 16:48:03,807 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 198 transitions. Word has length 188 [2018-11-18 16:48:03,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:03,808 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 198 transitions. [2018-11-18 16:48:03,808 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-18 16:48:03,808 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 198 transitions. [2018-11-18 16:48:03,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-11-18 16:48:03,813 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:03,813 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 15, 13, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 7, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:03,814 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:03,814 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:03,814 INFO L82 PathProgramCache]: Analyzing trace with hash 790923186, now seen corresponding path program 4 times [2018-11-18 16:48:03,814 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:03,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:03,815 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:48:03,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:03,815 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:03,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:04,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1595 backedges. 198 proven. 174 refuted. 0 times theorem prover too weak. 1223 trivial. 0 not checked. [2018-11-18 16:48:04,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:04,026 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:04,026 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:04,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:04,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:04,026 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:04,042 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:48:04,043 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 16:48:04,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:04,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:04,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1595 backedges. 92 proven. 439 refuted. 0 times theorem prover too weak. 1064 trivial. 0 not checked. [2018-11-18 16:48:04,298 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:05,484 INFO L134 CoverageAnalysis]: Checked inductivity of 1595 backedges. 92 proven. 463 refuted. 0 times theorem prover too weak. 1040 trivial. 0 not checked. [2018-11-18 16:48:05,502 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:05,502 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 12, 17] total 23 [2018-11-18 16:48:05,502 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:05,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 16:48:05,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 16:48:05,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=425, Unknown=0, NotChecked=0, Total=506 [2018-11-18 16:48:05,503 INFO L87 Difference]: Start difference. First operand 135 states and 198 transitions. Second operand 16 states. [2018-11-18 16:48:05,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:05,864 INFO L93 Difference]: Finished difference Result 356 states and 720 transitions. [2018-11-18 16:48:05,864 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-18 16:48:05,864 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 245 [2018-11-18 16:48:05,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:05,867 INFO L225 Difference]: With dead ends: 356 [2018-11-18 16:48:05,867 INFO L226 Difference]: Without dead ends: 210 [2018-11-18 16:48:05,869 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 508 GetRequests, 460 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=226, Invalid=964, Unknown=0, NotChecked=0, Total=1190 [2018-11-18 16:48:05,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2018-11-18 16:48:05,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 149. [2018-11-18 16:48:05,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-11-18 16:48:05,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 223 transitions. [2018-11-18 16:48:05,892 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 223 transitions. Word has length 245 [2018-11-18 16:48:05,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:05,892 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 223 transitions. [2018-11-18 16:48:05,892 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 16:48:05,892 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 223 transitions. [2018-11-18 16:48:05,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2018-11-18 16:48:05,899 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:05,900 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 24, 20, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 10, 9, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:05,900 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:05,900 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:05,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1059403098, now seen corresponding path program 5 times [2018-11-18 16:48:05,900 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:05,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:05,901 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:48:05,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:05,901 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:05,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:06,074 INFO L134 CoverageAnalysis]: Checked inductivity of 4614 backedges. 351 proven. 479 refuted. 0 times theorem prover too weak. 3784 trivial. 0 not checked. [2018-11-18 16:48:06,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:06,075 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:06,075 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:06,075 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:06,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:06,075 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:06,084 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 16:48:06,084 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 16:48:06,113 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-18 16:48:06,113 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:48:06,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:06,239 INFO L134 CoverageAnalysis]: Checked inductivity of 4614 backedges. 680 proven. 3 refuted. 0 times theorem prover too weak. 3931 trivial. 0 not checked. [2018-11-18 16:48:06,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:06,920 INFO L134 CoverageAnalysis]: Checked inductivity of 4614 backedges. 547 proven. 5 refuted. 0 times theorem prover too weak. 4062 trivial. 0 not checked. [2018-11-18 16:48:06,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:06,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 8] total 19 [2018-11-18 16:48:06,940 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:06,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 16:48:06,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 16:48:06,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2018-11-18 16:48:06,941 INFO L87 Difference]: Start difference. First operand 149 states and 223 transitions. Second operand 16 states. [2018-11-18 16:48:07,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:07,141 INFO L93 Difference]: Finished difference Result 274 states and 448 transitions. [2018-11-18 16:48:07,141 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-18 16:48:07,141 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 405 [2018-11-18 16:48:07,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:07,143 INFO L225 Difference]: With dead ends: 274 [2018-11-18 16:48:07,143 INFO L226 Difference]: Without dead ends: 151 [2018-11-18 16:48:07,144 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 828 GetRequests, 797 SyntacticMatches, 6 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=136, Invalid=566, Unknown=0, NotChecked=0, Total=702 [2018-11-18 16:48:07,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-11-18 16:48:07,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 145. [2018-11-18 16:48:07,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2018-11-18 16:48:07,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 201 transitions. [2018-11-18 16:48:07,157 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 201 transitions. Word has length 405 [2018-11-18 16:48:07,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:07,157 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 201 transitions. [2018-11-18 16:48:07,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 16:48:07,157 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 201 transitions. [2018-11-18 16:48:07,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 534 [2018-11-18 16:48:07,165 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:07,166 INFO L375 BasicCegarLoop]: trace histogram [42, 42, 35, 35, 34, 30, 21, 21, 21, 21, 21, 21, 21, 17, 17, 17, 17, 17, 17, 17, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:07,166 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:07,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:07,166 INFO L82 PathProgramCache]: Analyzing trace with hash 899949547, now seen corresponding path program 6 times [2018-11-18 16:48:07,166 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:07,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:07,167 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:48:07,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:07,167 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:07,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:07,432 INFO L134 CoverageAnalysis]: Checked inductivity of 8204 backedges. 318 proven. 1100 refuted. 0 times theorem prover too weak. 6786 trivial. 0 not checked. [2018-11-18 16:48:07,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:07,432 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:07,432 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:07,432 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:07,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:07,433 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:07,442 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 16:48:07,443 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 16:48:07,525 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 16:48:07,525 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:48:07,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:07,681 INFO L134 CoverageAnalysis]: Checked inductivity of 8204 backedges. 320 proven. 1095 refuted. 0 times theorem prover too weak. 6789 trivial. 0 not checked. [2018-11-18 16:48:07,681 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:09,396 INFO L134 CoverageAnalysis]: Checked inductivity of 8204 backedges. 321 proven. 1115 refuted. 0 times theorem prover too weak. 6768 trivial. 0 not checked. [2018-11-18 16:48:09,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:09,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 18] total 24 [2018-11-18 16:48:09,416 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:09,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-18 16:48:09,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-18 16:48:09,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2018-11-18 16:48:09,417 INFO L87 Difference]: Start difference. First operand 145 states and 201 transitions. Second operand 16 states. [2018-11-18 16:48:09,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:09,608 INFO L93 Difference]: Finished difference Result 260 states and 472 transitions. [2018-11-18 16:48:09,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-18 16:48:09,608 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 533 [2018-11-18 16:48:09,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:09,611 INFO L225 Difference]: With dead ends: 260 [2018-11-18 16:48:09,611 INFO L226 Difference]: Without dead ends: 153 [2018-11-18 16:48:09,613 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1090 GetRequests, 1046 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=186, Invalid=684, Unknown=0, NotChecked=0, Total=870 [2018-11-18 16:48:09,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2018-11-18 16:48:09,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 153. [2018-11-18 16:48:09,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-11-18 16:48:09,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 206 transitions. [2018-11-18 16:48:09,629 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 206 transitions. Word has length 533 [2018-11-18 16:48:09,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:09,630 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 206 transitions. [2018-11-18 16:48:09,630 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-18 16:48:09,630 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 206 transitions. [2018-11-18 16:48:09,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2018-11-18 16:48:09,635 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:09,636 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 30, 26, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 13, 9, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:09,636 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:09,636 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:09,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1897485789, now seen corresponding path program 7 times [2018-11-18 16:48:09,636 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:09,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:09,637 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:48:09,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:09,637 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:09,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:09,966 INFO L134 CoverageAnalysis]: Checked inductivity of 6472 backedges. 649 proven. 327 refuted. 0 times theorem prover too weak. 5496 trivial. 0 not checked. [2018-11-18 16:48:09,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:09,967 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:09,967 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:09,967 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:09,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:09,967 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:09,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:48:09,978 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 16:48:10,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:10,084 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:10,320 INFO L134 CoverageAnalysis]: Checked inductivity of 6472 backedges. 438 proven. 813 refuted. 0 times theorem prover too weak. 5221 trivial. 0 not checked. [2018-11-18 16:48:10,320 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:11,958 INFO L134 CoverageAnalysis]: Checked inductivity of 6472 backedges. 437 proven. 835 refuted. 0 times theorem prover too weak. 5200 trivial. 0 not checked. [2018-11-18 16:48:11,978 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:11,978 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 18] total 29 [2018-11-18 16:48:11,978 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:11,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-18 16:48:11,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-18 16:48:11,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=689, Unknown=0, NotChecked=0, Total=812 [2018-11-18 16:48:11,980 INFO L87 Difference]: Start difference. First operand 153 states and 206 transitions. Second operand 21 states. [2018-11-18 16:48:12,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:12,450 INFO L93 Difference]: Finished difference Result 339 states and 528 transitions. [2018-11-18 16:48:12,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-18 16:48:12,451 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 477 [2018-11-18 16:48:12,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:12,453 INFO L225 Difference]: With dead ends: 339 [2018-11-18 16:48:12,453 INFO L226 Difference]: Without dead ends: 197 [2018-11-18 16:48:12,454 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 982 GetRequests, 923 SyntacticMatches, 16 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=350, Invalid=1630, Unknown=0, NotChecked=0, Total=1980 [2018-11-18 16:48:12,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-11-18 16:48:12,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 179. [2018-11-18 16:48:12,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-11-18 16:48:12,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 248 transitions. [2018-11-18 16:48:12,469 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 248 transitions. Word has length 477 [2018-11-18 16:48:12,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:12,470 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 248 transitions. [2018-11-18 16:48:12,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-18 16:48:12,470 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 248 transitions. [2018-11-18 16:48:12,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2018-11-18 16:48:12,474 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:12,474 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 31, 29, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 18, 13, 10, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:12,474 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:12,474 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:12,475 INFO L82 PathProgramCache]: Analyzing trace with hash 575268532, now seen corresponding path program 8 times [2018-11-18 16:48:12,475 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:12,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:12,475 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:48:12,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:12,476 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:12,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:12,729 INFO L134 CoverageAnalysis]: Checked inductivity of 7643 backedges. 486 proven. 491 refuted. 0 times theorem prover too weak. 6666 trivial. 0 not checked. [2018-11-18 16:48:12,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:12,729 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:12,729 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:12,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:12,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:12,730 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:12,739 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 16:48:12,739 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 16:48:12,774 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-18 16:48:12,774 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:48:12,780 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:12,922 INFO L134 CoverageAnalysis]: Checked inductivity of 7643 backedges. 1200 proven. 36 refuted. 0 times theorem prover too weak. 6407 trivial. 0 not checked. [2018-11-18 16:48:12,922 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:14,103 INFO L134 CoverageAnalysis]: Checked inductivity of 7643 backedges. 1200 proven. 38 refuted. 0 times theorem prover too weak. 6405 trivial. 0 not checked. [2018-11-18 16:48:14,121 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:14,122 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 13] total 23 [2018-11-18 16:48:14,122 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:14,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-18 16:48:14,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-18 16:48:14,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2018-11-18 16:48:14,123 INFO L87 Difference]: Start difference. First operand 179 states and 248 transitions. Second operand 18 states. [2018-11-18 16:48:14,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:14,492 INFO L93 Difference]: Finished difference Result 344 states and 538 transitions. [2018-11-18 16:48:14,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-18 16:48:14,493 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 517 [2018-11-18 16:48:14,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:14,495 INFO L225 Difference]: With dead ends: 344 [2018-11-18 16:48:14,496 INFO L226 Difference]: Without dead ends: 187 [2018-11-18 16:48:14,498 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1057 GetRequests, 1012 SyntacticMatches, 11 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=230, Invalid=1030, Unknown=0, NotChecked=0, Total=1260 [2018-11-18 16:48:14,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-11-18 16:48:14,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 175. [2018-11-18 16:48:14,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-11-18 16:48:14,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 239 transitions. [2018-11-18 16:48:14,518 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 239 transitions. Word has length 517 [2018-11-18 16:48:14,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:14,519 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 239 transitions. [2018-11-18 16:48:14,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-18 16:48:14,519 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 239 transitions. [2018-11-18 16:48:14,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 423 [2018-11-18 16:48:14,523 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:14,524 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 25, 24, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 10, 9, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:14,524 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:14,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:14,524 INFO L82 PathProgramCache]: Analyzing trace with hash 643116701, now seen corresponding path program 9 times [2018-11-18 16:48:14,524 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:14,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:14,525 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:48:14,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:14,525 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:14,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:14,836 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 916 proven. 59 refuted. 0 times theorem prover too weak. 4041 trivial. 0 not checked. [2018-11-18 16:48:14,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:14,836 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:14,836 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:14,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:14,837 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:14,837 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:14,858 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 16:48:14,858 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 16:48:14,948 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 16:48:14,948 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:48:14,955 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:15,135 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 270 proven. 626 refuted. 0 times theorem prover too weak. 4120 trivial. 0 not checked. [2018-11-18 16:48:15,135 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:16,181 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 272 proven. 640 refuted. 0 times theorem prover too weak. 4104 trivial. 0 not checked. [2018-11-18 16:48:16,200 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:16,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 11, 15] total 28 [2018-11-18 16:48:16,200 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:16,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-18 16:48:16,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-18 16:48:16,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2018-11-18 16:48:16,201 INFO L87 Difference]: Start difference. First operand 175 states and 239 transitions. Second operand 22 states. [2018-11-18 16:48:16,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:16,923 INFO L93 Difference]: Finished difference Result 376 states and 581 transitions. [2018-11-18 16:48:16,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-18 16:48:16,923 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 422 [2018-11-18 16:48:16,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:16,926 INFO L225 Difference]: With dead ends: 376 [2018-11-18 16:48:16,926 INFO L226 Difference]: Without dead ends: 200 [2018-11-18 16:48:16,929 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 883 GetRequests, 819 SyntacticMatches, 13 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=435, Invalid=2321, Unknown=0, NotChecked=0, Total=2756 [2018-11-18 16:48:16,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-11-18 16:48:16,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 187. [2018-11-18 16:48:16,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-11-18 16:48:16,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 249 transitions. [2018-11-18 16:48:16,945 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 249 transitions. Word has length 422 [2018-11-18 16:48:16,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:16,945 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 249 transitions. [2018-11-18 16:48:16,945 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-18 16:48:16,945 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 249 transitions. [2018-11-18 16:48:16,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2018-11-18 16:48:16,948 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:16,948 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 24, 24, 22, 20, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 10, 7, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:16,948 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:16,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:16,949 INFO L82 PathProgramCache]: Analyzing trace with hash 1748139435, now seen corresponding path program 10 times [2018-11-18 16:48:16,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:16,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:16,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:48:16,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:16,950 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:16,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:17,173 INFO L134 CoverageAnalysis]: Checked inductivity of 3777 backedges. 366 proven. 370 refuted. 0 times theorem prover too weak. 3041 trivial. 0 not checked. [2018-11-18 16:48:17,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:17,174 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:17,174 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:17,174 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:17,174 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:17,174 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:17,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:48:17,184 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 16:48:17,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:17,258 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:17,404 INFO L134 CoverageAnalysis]: Checked inductivity of 3777 backedges. 333 proven. 470 refuted. 0 times theorem prover too weak. 2974 trivial. 0 not checked. [2018-11-18 16:48:17,405 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:18,567 INFO L134 CoverageAnalysis]: Checked inductivity of 3777 backedges. 335 proven. 484 refuted. 0 times theorem prover too weak. 2958 trivial. 0 not checked. [2018-11-18 16:48:18,585 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:18,586 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 16] total 27 [2018-11-18 16:48:18,586 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:18,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-18 16:48:18,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-18 16:48:18,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=595, Unknown=0, NotChecked=0, Total=702 [2018-11-18 16:48:18,587 INFO L87 Difference]: Start difference. First operand 187 states and 249 transitions. Second operand 20 states. [2018-11-18 16:48:18,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:18,916 INFO L93 Difference]: Finished difference Result 334 states and 463 transitions. [2018-11-18 16:48:18,917 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-18 16:48:18,917 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 367 [2018-11-18 16:48:18,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:18,918 INFO L225 Difference]: With dead ends: 334 [2018-11-18 16:48:18,918 INFO L226 Difference]: Without dead ends: 184 [2018-11-18 16:48:18,920 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 705 SyntacticMatches, 14 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=250, Invalid=1232, Unknown=0, NotChecked=0, Total=1482 [2018-11-18 16:48:18,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-11-18 16:48:18,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 173. [2018-11-18 16:48:18,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2018-11-18 16:48:18,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 220 transitions. [2018-11-18 16:48:18,935 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 220 transitions. Word has length 367 [2018-11-18 16:48:18,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:18,935 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 220 transitions. [2018-11-18 16:48:18,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-18 16:48:18,935 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 220 transitions. [2018-11-18 16:48:18,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2018-11-18 16:48:18,941 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:18,941 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 26, 25, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 11, 9, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:18,941 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:18,941 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:18,941 INFO L82 PathProgramCache]: Analyzing trace with hash -1740376526, now seen corresponding path program 11 times [2018-11-18 16:48:18,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:18,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:18,942 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:48:18,942 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:18,943 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:18,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:19,239 INFO L134 CoverageAnalysis]: Checked inductivity of 5369 backedges. 1090 proven. 156 refuted. 0 times theorem prover too weak. 4123 trivial. 0 not checked. [2018-11-18 16:48:19,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:19,239 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:19,240 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:19,240 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:19,240 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:19,240 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:19,252 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 16:48:19,252 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 16:48:19,317 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-11-18 16:48:19,317 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:48:19,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:19,422 INFO L134 CoverageAnalysis]: Checked inductivity of 5369 backedges. 663 proven. 113 refuted. 0 times theorem prover too weak. 4593 trivial. 0 not checked. [2018-11-18 16:48:19,422 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:20,301 INFO L134 CoverageAnalysis]: Checked inductivity of 5369 backedges. 667 proven. 119 refuted. 0 times theorem prover too weak. 4583 trivial. 0 not checked. [2018-11-18 16:48:20,319 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:20,319 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 10, 13] total 25 [2018-11-18 16:48:20,319 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:20,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-18 16:48:20,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-18 16:48:20,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2018-11-18 16:48:20,320 INFO L87 Difference]: Start difference. First operand 173 states and 220 transitions. Second operand 20 states. [2018-11-18 16:48:20,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:20,938 INFO L93 Difference]: Finished difference Result 232 states and 303 transitions. [2018-11-18 16:48:20,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-18 16:48:20,939 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 436 [2018-11-18 16:48:20,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:20,941 INFO L225 Difference]: With dead ends: 232 [2018-11-18 16:48:20,941 INFO L226 Difference]: Without dead ends: 208 [2018-11-18 16:48:20,942 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 912 GetRequests, 856 SyntacticMatches, 11 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=345, Invalid=1817, Unknown=0, NotChecked=0, Total=2162 [2018-11-18 16:48:20,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-11-18 16:48:20,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 196. [2018-11-18 16:48:20,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-11-18 16:48:20,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 255 transitions. [2018-11-18 16:48:20,952 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 255 transitions. Word has length 436 [2018-11-18 16:48:20,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:20,954 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 255 transitions. [2018-11-18 16:48:20,954 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-18 16:48:20,955 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 255 transitions. [2018-11-18 16:48:20,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2018-11-18 16:48:20,957 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:20,958 INFO L375 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 26, 26, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:20,958 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:20,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:20,958 INFO L82 PathProgramCache]: Analyzing trace with hash -134006843, now seen corresponding path program 12 times [2018-11-18 16:48:20,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:20,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:20,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:48:20,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:20,959 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:20,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:21,155 INFO L134 CoverageAnalysis]: Checked inductivity of 5706 backedges. 934 proven. 290 refuted. 0 times theorem prover too weak. 4482 trivial. 0 not checked. [2018-11-18 16:48:21,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:21,155 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:21,156 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:21,156 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:21,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:21,156 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:21,167 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 16:48:21,168 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 16:48:21,234 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 16:48:21,234 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:48:21,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:21,383 INFO L134 CoverageAnalysis]: Checked inductivity of 5706 backedges. 402 proven. 559 refuted. 0 times theorem prover too weak. 4745 trivial. 0 not checked. [2018-11-18 16:48:21,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:22,540 INFO L134 CoverageAnalysis]: Checked inductivity of 5706 backedges. 404 proven. 573 refuted. 0 times theorem prover too weak. 4729 trivial. 0 not checked. [2018-11-18 16:48:22,560 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:22,560 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11, 15] total 28 [2018-11-18 16:48:22,560 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:22,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-18 16:48:22,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-18 16:48:22,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=662, Unknown=0, NotChecked=0, Total=756 [2018-11-18 16:48:22,561 INFO L87 Difference]: Start difference. First operand 196 states and 255 transitions. Second operand 22 states. [2018-11-18 16:48:23,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:23,293 INFO L93 Difference]: Finished difference Result 400 states and 580 transitions. [2018-11-18 16:48:23,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-18 16:48:23,293 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 449 [2018-11-18 16:48:23,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:23,296 INFO L225 Difference]: With dead ends: 400 [2018-11-18 16:48:23,296 INFO L226 Difference]: Without dead ends: 230 [2018-11-18 16:48:23,297 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 875 SyntacticMatches, 13 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 550 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=423, Invalid=2127, Unknown=0, NotChecked=0, Total=2550 [2018-11-18 16:48:23,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2018-11-18 16:48:23,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 209. [2018-11-18 16:48:23,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-11-18 16:48:23,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 272 transitions. [2018-11-18 16:48:23,315 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 272 transitions. Word has length 449 [2018-11-18 16:48:23,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:23,316 INFO L480 AbstractCegarLoop]: Abstraction has 209 states and 272 transitions. [2018-11-18 16:48:23,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-18 16:48:23,316 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 272 transitions. [2018-11-18 16:48:23,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 586 [2018-11-18 16:48:23,320 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:23,320 INFO L375 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 35, 33, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 14, 12, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:23,320 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:23,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:23,321 INFO L82 PathProgramCache]: Analyzing trace with hash 563382971, now seen corresponding path program 13 times [2018-11-18 16:48:23,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:23,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:23,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:48:23,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:23,322 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:23,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:23,630 INFO L134 CoverageAnalysis]: Checked inductivity of 9859 backedges. 1044 proven. 531 refuted. 0 times theorem prover too weak. 8284 trivial. 0 not checked. [2018-11-18 16:48:23,631 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:23,631 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:23,631 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:23,631 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:23,631 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:23,631 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:23,638 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:48:23,638 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-18 16:48:23,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:23,741 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:23,969 INFO L134 CoverageAnalysis]: Checked inductivity of 9859 backedges. 353 proven. 1219 refuted. 0 times theorem prover too weak. 8287 trivial. 0 not checked. [2018-11-18 16:48:23,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:25,587 INFO L134 CoverageAnalysis]: Checked inductivity of 9859 backedges. 352 proven. 1241 refuted. 0 times theorem prover too weak. 8266 trivial. 0 not checked. [2018-11-18 16:48:25,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:25,605 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 18] total 27 [2018-11-18 16:48:25,605 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:25,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-18 16:48:25,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-18 16:48:25,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=568, Unknown=0, NotChecked=0, Total=702 [2018-11-18 16:48:25,606 INFO L87 Difference]: Start difference. First operand 209 states and 272 transitions. Second operand 19 states. [2018-11-18 16:48:25,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:25,836 INFO L93 Difference]: Finished difference Result 249 states and 335 transitions. [2018-11-18 16:48:25,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-18 16:48:25,837 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 585 [2018-11-18 16:48:25,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:25,838 INFO L225 Difference]: With dead ends: 249 [2018-11-18 16:48:25,839 INFO L226 Difference]: Without dead ends: 181 [2018-11-18 16:48:25,839 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1197 GetRequests, 1147 SyntacticMatches, 16 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=257, Invalid=1003, Unknown=0, NotChecked=0, Total=1260 [2018-11-18 16:48:25,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-11-18 16:48:25,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 178. [2018-11-18 16:48:25,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-11-18 16:48:25,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 217 transitions. [2018-11-18 16:48:25,849 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 217 transitions. Word has length 585 [2018-11-18 16:48:25,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:25,850 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 217 transitions. [2018-11-18 16:48:25,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-18 16:48:25,850 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 217 transitions. [2018-11-18 16:48:25,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2018-11-18 16:48:25,852 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:25,852 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:25,852 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:25,853 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:25,853 INFO L82 PathProgramCache]: Analyzing trace with hash 1326629730, now seen corresponding path program 14 times [2018-11-18 16:48:25,853 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:25,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:25,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 16:48:25,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:25,854 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:25,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:26,722 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2018-11-18 16:48:26,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:26,722 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:26,722 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:26,722 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:26,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:26,722 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:26,730 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 16:48:26,730 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-18 16:48:26,844 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-11-18 16:48:26,845 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:48:26,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:27,769 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2018-11-18 16:48:27,769 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:30,680 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 0 proven. 2033 refuted. 0 times theorem prover too weak. 4049 trivial. 0 not checked. [2018-11-18 16:48:30,700 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:30,700 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 52 [2018-11-18 16:48:30,701 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:30,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-18 16:48:30,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-18 16:48:30,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 16:48:30,702 INFO L87 Difference]: Start difference. First operand 178 states and 217 transitions. Second operand 52 states. [2018-11-18 16:48:31,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:31,281 INFO L93 Difference]: Finished difference Result 188 states and 226 transitions. [2018-11-18 16:48:31,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-18 16:48:31,281 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 463 [2018-11-18 16:48:31,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:31,283 INFO L225 Difference]: With dead ends: 188 [2018-11-18 16:48:31,283 INFO L226 Difference]: Without dead ends: 169 [2018-11-18 16:48:31,284 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 1062 GetRequests, 942 SyntacticMatches, 70 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=125, Invalid=2527, Unknown=0, NotChecked=0, Total=2652 [2018-11-18 16:48:31,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-18 16:48:31,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-11-18 16:48:31,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-11-18 16:48:31,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 204 transitions. [2018-11-18 16:48:31,297 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 204 transitions. Word has length 463 [2018-11-18 16:48:31,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:31,298 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 204 transitions. [2018-11-18 16:48:31,298 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-18 16:48:31,298 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 204 transitions. [2018-11-18 16:48:31,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 423 [2018-11-18 16:48:31,303 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 16:48:31,304 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 25, 24, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 10, 9, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 16:48:31,304 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 16:48:31,304 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 16:48:31,304 INFO L82 PathProgramCache]: Analyzing trace with hash -322048271, now seen corresponding path program 15 times [2018-11-18 16:48:31,304 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 16:48:31,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:31,305 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 16:48:31,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 16:48:31,305 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 16:48:31,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 16:48:31,506 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 557 proven. 195 refuted. 0 times theorem prover too weak. 4264 trivial. 0 not checked. [2018-11-18 16:48:31,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:31,506 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-18 16:48:31,507 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-18 16:48:31,507 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-18 16:48:31,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 16:48:31,507 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/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 [2018-11-18 16:48:31,520 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-18 16:48:31,520 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-18 16:48:31,597 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-18 16:48:31,597 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 16:48:31,608 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 16:48:31,723 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 665 proven. 231 refuted. 0 times theorem prover too weak. 4120 trivial. 0 not checked. [2018-11-18 16:48:31,724 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-18 16:48:32,941 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 669 proven. 243 refuted. 0 times theorem prover too weak. 4104 trivial. 0 not checked. [2018-11-18 16:48:32,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-18 16:48:32,960 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 15] total 18 [2018-11-18 16:48:32,960 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-18 16:48:32,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-18 16:48:32,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-18 16:48:32,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2018-11-18 16:48:32,961 INFO L87 Difference]: Start difference. First operand 169 states and 204 transitions. Second operand 12 states. [2018-11-18 16:48:33,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 16:48:33,090 INFO L93 Difference]: Finished difference Result 169 states and 204 transitions. [2018-11-18 16:48:33,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-18 16:48:33,093 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 422 [2018-11-18 16:48:33,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 16:48:33,094 INFO L225 Difference]: With dead ends: 169 [2018-11-18 16:48:33,094 INFO L226 Difference]: Without dead ends: 0 [2018-11-18 16:48:33,095 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 863 GetRequests, 827 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=470, Unknown=0, NotChecked=0, Total=600 [2018-11-18 16:48:33,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-18 16:48:33,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-18 16:48:33,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-18 16:48:33,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-18 16:48:33,096 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 422 [2018-11-18 16:48:33,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 16:48:33,096 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-18 16:48:33,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-18 16:48:33,096 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-18 16:48:33,096 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-18 16:48:33,101 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-18 16:48:34,038 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:34,962 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:35,008 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:35,017 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:35,029 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:35,074 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:35,079 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:35,130 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:35,171 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:35,181 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:35,218 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:35,229 WARN L250 erpolLogProxyWrapper]: Already inconsistent. [2018-11-18 16:48:36,088 WARN L180 SmtUtils]: Spent 697.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 45 [2018-11-18 16:48:36,772 WARN L180 SmtUtils]: Spent 578.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 46 [2018-11-18 16:48:36,774 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-18 16:48:36,774 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-18 16:48:36,774 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-18 16:48:36,774 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-18 16:48:36,774 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-18 16:48:36,774 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-18 16:48:36,774 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2018-11-18 16:48:36,774 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2018-11-18 16:48:36,774 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2018-11-18 16:48:36,775 INFO L425 ceAbstractionStarter]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2018-11-18 16:48:36,775 INFO L425 ceAbstractionStarter]: For program point L39(line 39) no Hoare annotation was computed. [2018-11-18 16:48:36,775 INFO L425 ceAbstractionStarter]: For program point L38(lines 38 40) no Hoare annotation was computed. [2018-11-18 16:48:36,775 INFO L421 ceAbstractionStarter]: At program point L37(line 37) the Hoare annotation is: (and (<= 8 main_~x~0) (<= main_~x~0 8)) [2018-11-18 16:48:36,775 INFO L425 ceAbstractionStarter]: For program point L37-1(line 37) no Hoare annotation was computed. [2018-11-18 16:48:36,775 INFO L425 ceAbstractionStarter]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2018-11-18 16:48:36,775 INFO L428 ceAbstractionStarter]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2018-11-18 16:48:36,775 INFO L421 ceAbstractionStarter]: At program point L23(line 23) the Hoare annotation is: (and (< 2 |fibo2_#in~n|) (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n)) [2018-11-18 16:48:36,775 INFO L425 ceAbstractionStarter]: For program point L23-1(line 23) no Hoare annotation was computed. [2018-11-18 16:48:36,775 INFO L421 ceAbstractionStarter]: At program point L23-2(line 23) the Hoare annotation is: (let ((.cse0 (and (<= 3 |fibo2_#t~ret2|) (<= |fibo2_#t~ret2| 3) (<= 5 |fibo2_#in~n|) (<= |fibo2_#in~n| 5)))) (and (<= fibo2_~n |fibo2_#in~n|) (or (<= fibo2_~n 3) (and (<= |fibo2_#t~ret2| 2) (<= 2 |fibo2_#t~ret2|)) .cse0 (<= 6 |fibo2_#in~n|)) (<= |fibo2_#in~n| fibo2_~n) (or (<= 7 |fibo2_#in~n|) (and (<= |fibo2_#t~ret2| 5) (<= 5 |fibo2_#t~ret2|)) .cse0 (<= |fibo2_#in~n| 4)) (or (and (<= 1 |fibo2_#t~ret2|) (<= |fibo2_#t~ret2| 1) (<= 3 |fibo2_#in~n|)) (< 3 |fibo2_#in~n|)) (or (and (<= |fibo2_#t~ret2| 8) (<= 8 |fibo2_#t~ret2|)) (not (= |fibo2_#in~n| 7))))) [2018-11-18 16:48:36,775 INFO L425 ceAbstractionStarter]: For program point L20(lines 20 24) no Hoare annotation was computed. [2018-11-18 16:48:36,775 INFO L425 ceAbstractionStarter]: For program point L23-3(line 23) no Hoare annotation was computed. [2018-11-18 16:48:36,775 INFO L425 ceAbstractionStarter]: For program point L18(lines 18 24) no Hoare annotation was computed. [2018-11-18 16:48:36,775 INFO L425 ceAbstractionStarter]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2018-11-18 16:48:36,776 INFO L425 ceAbstractionStarter]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2018-11-18 16:48:36,776 INFO L428 ceAbstractionStarter]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2018-11-18 16:48:36,776 INFO L421 ceAbstractionStarter]: At program point L13(line 13) the Hoare annotation is: (and (< 2 |fibo1_#in~n|) (<= fibo1_~n |fibo1_#in~n|) (<= |fibo1_#in~n| fibo1_~n)) [2018-11-18 16:48:36,776 INFO L425 ceAbstractionStarter]: For program point L13-1(line 13) no Hoare annotation was computed. [2018-11-18 16:48:36,776 INFO L421 ceAbstractionStarter]: At program point L13-2(line 13) the Hoare annotation is: (and (or (<= 4 fibo1_~n) (and (<= 1 |fibo1_#t~ret0|) (<= |fibo1_#t~ret0| 1))) (<= fibo1_~n |fibo1_#in~n|) (or (and (<= |fibo1_#t~ret0| 5) (<= 5 |fibo1_#t~ret0|)) (not (= |fibo1_#in~n| 6))) (or (and (<= |fibo1_#t~ret0| 13) (<= 13 |fibo1_#t~ret0|)) (not (= |fibo1_#in~n| 8))) (<= |fibo1_#in~n| fibo1_~n) (or (<= 6 |fibo1_#in~n|) (<= |fibo1_#in~n| 4) (and (<= 3 |fibo1_#t~ret0|) (<= |fibo1_#t~ret0| 3))) (or (and (<= 3 |fibo1_#in~n|) (<= |fibo1_#in~n| 3)) (and (<= 2 |fibo1_#t~ret0|) (<= |fibo1_#t~ret0| 2)) (<= 5 fibo1_~n))) [2018-11-18 16:48:36,776 INFO L425 ceAbstractionStarter]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2018-11-18 16:48:36,776 INFO L425 ceAbstractionStarter]: For program point L10(lines 10 14) no Hoare annotation was computed. [2018-11-18 16:48:36,776 INFO L425 ceAbstractionStarter]: For program point L13-3(line 13) no Hoare annotation was computed. [2018-11-18 16:48:36,776 INFO L425 ceAbstractionStarter]: For program point L8(lines 8 14) no Hoare annotation was computed. [2018-11-18 16:48:36,776 INFO L425 ceAbstractionStarter]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2018-11-18 16:48:36,779 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 04:48:36 BoogieIcfgContainer [2018-11-18 16:48:36,779 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 16:48:36,779 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 16:48:36,779 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 16:48:36,780 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 16:48:36,780 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 04:47:45" (3/4) ... [2018-11-18 16:48:36,784 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-18 16:48:36,791 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-18 16:48:36,791 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-18 16:48:36,791 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo2 [2018-11-18 16:48:36,791 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure fibo1 [2018-11-18 16:48:36,796 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2018-11-18 16:48:36,796 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2018-11-18 16:48:36,796 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-18 16:48:36,841 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_072f8f78-5fda-4d6c-aa1e-12f3323425f6/bin-2019/utaipan/witness.graphml [2018-11-18 16:48:36,841 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 16:48:36,842 INFO L168 Benchmark]: Toolchain (without parser) took 52071.69 ms. Allocated memory was 1.0 GB in the beginning and 3.7 GB in the end (delta: 2.7 GB). Free memory was 960.9 MB in the beginning and 1.7 GB in the end (delta: -768.6 MB). Peak memory consumption was 1.9 GB. Max. memory is 11.5 GB. [2018-11-18 16:48:36,842 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 982.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 16:48:36,842 INFO L168 Benchmark]: CACSL2BoogieTranslator took 191.53 ms. Allocated memory is still 1.0 GB. Free memory was 960.9 MB in the beginning and 949.0 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. [2018-11-18 16:48:36,842 INFO L168 Benchmark]: Boogie Procedure Inliner took 16.64 ms. Allocated memory is still 1.0 GB. Free memory was 949.0 MB in the beginning and 943.7 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2018-11-18 16:48:36,843 INFO L168 Benchmark]: Boogie Preprocessor took 15.32 ms. Allocated memory is still 1.0 GB. Free memory is still 943.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 16:48:36,843 INFO L168 Benchmark]: RCFGBuilder took 224.34 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 131.6 MB). Free memory was 943.7 MB in the beginning and 1.1 GB in the end (delta: -173.7 MB). Peak memory consumption was 14.5 MB. Max. memory is 11.5 GB. [2018-11-18 16:48:36,843 INFO L168 Benchmark]: TraceAbstraction took 51558.25 ms. Allocated memory was 1.2 GB in the beginning and 3.7 GB in the end (delta: 2.6 GB). Free memory was 1.1 GB in the beginning and 1.7 GB in the end (delta: -612.0 MB). Peak memory consumption was 2.0 GB. Max. memory is 11.5 GB. [2018-11-18 16:48:36,844 INFO L168 Benchmark]: Witness Printer took 61.72 ms. Allocated memory is still 3.7 GB. Free memory is still 1.7 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 16:48:36,846 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 982.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 191.53 ms. Allocated memory is still 1.0 GB. Free memory was 960.9 MB in the beginning and 949.0 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 16.64 ms. Allocated memory is still 1.0 GB. Free memory was 949.0 MB in the beginning and 943.7 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 15.32 ms. Allocated memory is still 1.0 GB. Free memory is still 943.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 224.34 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 131.6 MB). Free memory was 943.7 MB in the beginning and 1.1 GB in the end (delta: -173.7 MB). Peak memory consumption was 14.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 51558.25 ms. Allocated memory was 1.2 GB in the beginning and 3.7 GB in the end (delta: 2.6 GB). Free memory was 1.1 GB in the beginning and 1.7 GB in the end (delta: -612.0 MB). Peak memory consumption was 2.0 GB. Max. memory is 11.5 GB. * Witness Printer took 61.72 ms. Allocated memory is still 3.7 GB. Free memory is still 1.7 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. SAFE Result, 51.4s OverallTime, 22 OverallIterations, 43 TraceHistogramMax, 7.6s AutomataDifference, 0.0s DeadEndRemovalTime, 3.6s HoareAnnotationTime, HoareTripleCheckerStatistics: 825 SDtfs, 1192 SDslu, 8497 SDs, 0 SdLazy, 7917 SolverSat, 1160 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.4s Time, PredicateUnifierStatistics: 8 DeclaredPredicates, 12210 GetRequests, 11341 SyntacticMatches, 250 SemanticMatches, 619 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4618 ImplicationChecksByTransitivity, 8.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=209occurred in iteration=19, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 11.9s AbstIntTime, 5 AbstIntIterations, 4 AbstIntStrong, 0.8604060913705583 AbsIntWeakeningRatio, 0.5685279187817259 AbsIntAvgWeakeningVarsNumRemoved, 0.20812182741116753 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 22 MinimizatonAttempts, 292 StatesRemovedByMinimization, 15 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 1031 PreInvPairs, 2454 NumberOfFragments, 200 HoareAnnotationTreeSize, 1031 FomulaSimplifications, 334891 FormulaSimplificationTreeSizeReduction, 2.1s HoareSimplificationTime, 11 FomulaSimplificationsInter, 24187 FormulaSimplificationTreeSizeReductionInter, 1.5s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 1.1s SatisfiabilityAnalysisTime, 24.3s InterpolantComputationTime, 11700 NumberOfCodeBlocks, 10290 NumberOfCodeBlocksAsserted, 89 NumberOfCheckSat, 17382 ConstructedInterpolants, 0 QuantifiedInterpolants, 11455124 SizeOfPredicates, 99 NumberOfNonLiveVariables, 9397 ConjunctsInSsa, 468 ConjunctsInUnsatCore, 54 InterpolantComputations, 2 PerfectInterpolantSequences, 189694/212189 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...