SA junfengtwoheyblpcsarenglercsstanfordedu ABSTRACT File systems RAID systems and applications that require data consistency among others assure data integrity by carefully forcing valuable data to stable storage Unfortu nately verifying that a syste ID: 86266
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EXPLODE:ALightweight,GeneralApproachtoFindingSeriousErrorsinStorageSystemsJunfengYang,PaulTwohey,BenPfaff,CanSar,DawsonEnglerComputerSystemsLaboratoryStanfordUniversityStanford,CA94305,U.S.A.fjunfeng,twohey,blp,csar,engler@cs.stanford.edugABSTRACTFilesystems,RAIDsystems,andapplicationsthatrequiredataconsistency,amongothers,assuredataintegritybycarefullyforcingvaluabledatatostablestorage.Unfortu-nately,verifyingthatasystemcanrecoverfromacrashtoavalidstateatanyprogramcounterisverydicult.Previoustechniquesforndingdataintegritybugshavebeenheavy-weight,requiringextensiveeortforeachOSandlesystemtobechecked.Wedemonstratealightweight,\rexible,easy-to-applytechniquebydevelopingatoolcalledExplodeandshowhowweusedittond25seriousbugsineightLinuxlesystems,LinuxsoftwareRAID5,LinuxNFS,andthreeversioncontrolsystems.1.INTRODUCTIONManysystemspreventthelossofvaluabledatabycare-fullyforcingittostablestorage.Applicationssuchasver-sioncontrolandmailhandlingsystemsensuredataintegrityvialesystemsynchronizationservices.Thelesysteminturnusessynchronouswrites,journaling,etc.toassurein-tegrity.Attheblockdevicelayer,RAIDsystemsusere-dundancytosurvivediskfailure.Attheapplicationlayer,softwarebasedonthesesystemsisoftentrustedwiththeonlycopyofdata,makingdatalossirrevocableandarbi-trarilyserious.Unfortunately,verifyingthatasystemcanrecoverfromacrashtoavalidstateatanyprogramcounterisverydicult.Ourgoalistocomprehensivelytestrealsystemsfordatapersistenceerrors,adaptingideasfrommodelchecking.Tra-ditionalmodelchecking[5]requiresthattheimplementorrewritethesysteminanarticialmodelinglanguage.Alatertechnique,calledimplementation-levelmodelchecking,eliminatesthisrequirement[19,18,21]bycheckingcodedi-rectly.Itistailoredtoeectivelynderrorsinsystemcode,notverifycorrectness.Toachievethisgoal,itaggressivelydeploysunsoundstateabstractionstotradecompletenessforeectiveness.OnemajordisadvantageofthistechniqueThisresearchwassupportedbyNSFgrantCCR-0326227and0121481,DARPAgrantF29601-03-2-0117,anNSFCa-reerawardandStanfordGraduateFellowship.Permissiontomakedigitalorhardcopiesofallorpartofthisworkforpersonalorclassroomuseisgrantedwithoutfeeprovidedthatcopiesarenotmadeordistributedforprotorcommercialadvantageandthatcopiesbearthisnoticeandthefullcitationontherstpage.Tocopyotherwise,torepublish,topostonserversortoredistributetolists,requirespriorspecicpermissionand/orafee.Copyright200XACMXXXXXXXXX/XX/XX...$5.00.isthatitcannotchecksoftwarewithoutsourcecodeandre-quiresportingtheentireOStorunontopofamodelchecker,whichnecessitatesmanyintrusive,non-portablemodica-tions.CheckinganewOSoradierentversionofthesameOSrequiresanewport.Evencheckingnewlesystemsoftenrequiresaboutaweekofeort.Thispaperdescribesourimprovedapproachthatreme-diestheseproblems.Wereducetheinfrastructureneededforcheckingasystemtoasingledevicedriver,whichcanberuninsideofastockkernelthatrunsonrealhardware.Thislightweightapproachmakesiteasytochecknewlesystems(andotherstoragesystems):simplymountandrun.Check-inganewOSisusuallyamatterofimplementingadevicedriver.Ourapproachisalsoverygeneralinthatitrarelylimitsthetypesofchecksthatcanbedone:ifyoucanrunapro-gram,youcancheckit.WeusedExplodetocheckCVSandSubversion,bothopensourceversioncontrolsystems,andBitKeeper,acommercialversioncontrolsystem,nd-ingbugsinallthree.Atthenetworklayer,wecheckedtheLinuxNFSclientandserver.Atthelesystemlayer,wechecked8dierentLinuxlesystems.Finally,attheblockdevicelayer,wecheckedtheLinuxRAID5implementation.Explodecannderrorseveninprogramsforwhichwedonothavethesource,aswedidwithBitKeeper.Explodecancheckalmostallofthemyriadwaysthestor-agelayerscanbestackedononeanother,asshownontheleftsideofFigure1.Thisabilityhasthreebenets.First,Explodecanreuseconsistencychecksforonespeciclayertocheckallthelayersbelowit.Forexample,onceweimple-mentaconsistencycheckforalesystemontopofasingledisk,wecaneasilypluginaRAIDlayerandcheckthatRAIDdoesnotcompromisethisguarantee.Second,testingentirestacksfacilitatesend-to-endchecking.Dataconsis-tencyisessentiallyend-to-end:inamulti-layersystem,ifonelayerisbroken,theentiresystemisbroken.Simplyverifyingthatasinglelayeriscorrectmayhavelittleprac-ticalvalueforend-to-endconsistency,anditmayrequireahugeamountofmanualeorttoseparatethislayerfromthesystemandbuildatestharnessforit.Third,wecancross-checkdierentimplementationsofonelayerandlocal-izeerrors.Forexample,ifabugoccurswithanapplicationontopof7outof8lesystems,theapplicationisproba-blybuggy,butifitoccursononlyonelesystem,thatlesystemisprobablybuggy.Thecontributionsofthispapercanbesummarizedasfollows: /Pre; ict;or 1; /C;olum;ns 2; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 2; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 3; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 1; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 1; /C;olor;s 30;'/Pre; ict;or 1; /C;olum;ns 1; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 1; /C;olor;s 30;'/Pre; ict;or 1; /C;olum;ns 1; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 1; /C;olor;s 30;/Pre; ict;or 1; /C;olum;ns 1; /C;olor;s 30;/Pre; ict;or 1; 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