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Mon, 31 May 2021 15:41:51 +0000 Received: from YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM ([fe80::583:528b:dbac:37bf]) by YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM ([fe80::583:528b:dbac:37bf%4]) with mapi id 15.20.4173.030; Mon, 31 May 2021 15:41:51 +0000 From: Rick Macklem To: Mateusz Guzik , Dimitry Andric CC: FreeBSD Current , Rick Macklem Subject: Re: Panics in recent NFS server Thread-Topic: Panics in recent NFS server Thread-Index: AQHXViaWmOgwBnlD30uTFQ19JhtRYar9qgCAgAABKICAAAQvUA== Date: Mon, 31 May 2021 15:41:51 +0000 Message-ID: References: , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 8cc7cf99-69ad-45a8-bb4f-08d9244a9c4e x-ms-traffictypediagnostic: YQXPR01MB4643: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:411; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(396003)(39860400002)(366004)(346002)(136003)(376002)(9686003)(7696005)(8936002)(786003)(2906002)(110136005)(54906003)(52536014)(4326008)(55016002)(478600001)(316002)(66946007)(71200400001)(186003)(66476007)(64756008)(66556008)(66446008)(83380400001)(76116006)(6506007)(38100700002)(8676002)(86362001)(5660300002)(122000001)(33656002);DIR:OUT;SFP:1101; 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none X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-ThisMailContainsUnwantedMimeParts: N Mateusz Guzik wrote:=0A= >On 5/31/21, Mateusz Guzik wrote:=0A= >> It's probably my commit d81aefa8b7dd8cbeffeda541fca9962802404983 ,=0A= >> I'll look at this later.=0A= >=0A= >Well let me rephrase. While the panic was added in said commit, I=0A= >suspect the bug is on nfs side -- it has its own namei variant which I=0A= >suspect is managing ni_pathlen in a manner different than the=0A= >original, it just happens to not panic on kernels prior to the above=0A= >change.=0A= The NFS code for lookup has not changed in a long time.=0A= There have definitely been no changed recently.=0A= The code should be nul terminating the path in nfsrv_parsename(),=0A= which looks straightforward.=0A= =0A= However, the NFS code does not include the nul byte in the ni_pathlen,=0A= and never has.=0A= =0A= Shouldn't it be:=0A= nulchar =3D &cnp->cn_nameptr[ndp->ni_pathlen];=0A= and not=0A= nulchar =3D &cnp->cn_nameptr[ndp->ni_pathlen - 1];=0A= =0A= rick=0A= =0A= >=0A= > On 5/31/21, Dimitry Andric wrote:=0A= >> Hi,=0A= >>=0A= >> I recently upgraded a -CURRENT NFS server from 2021-05-12 to today=0A= >> (2021-05-31), and when the first NFS client attempted to connect, I got= =0A= >> this=0A= >> panic:=0A= >>=0A= >> panic: lookup: expected nul at 0xfffff800104b3002; string [dim]=0A= >>=0A= >> cpuid =3D 0=0A= >> time =3D 1622463863=0A= >> KDB: stack backtrace:=0A= >> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame=0A= >> 0xfffffe00747e89b0=0A= >> vpanic() at vpanic+0x187/frame 0xfffffe00747e8a10=0A= >> panic() at panic+0x43/frame 0xfffffe00747e8a70=0A= >> lookup() at lookup+0xad2/frame 0xfffffe00747e8b10=0A= >> nfsvno_namei() at nfsvno_namei+0x1a4/frame 0xfffffe00747e8bc0=0A= >> nfsrvd_lookup() at nfsrvd_lookup+0x191/frame 0xfffffe00747e8eb0=0A= >> nfsrvd_dorpc() at nfsrvd_dorpc+0xfab/frame 0xfffffe00747e90c0=0A= >> nfssvc_program() at nfssvc_program+0x604/frame 0xfffffe00747e92a0=0A= >> svc_run_internal() at svc_run_internal+0xa72/frame 0xfffffe00747e93d0=0A= >> svc_run() at svc_run+0x250/frame 0xfffffe00747e9430=0A= >> nfsrvd_nfsd() at nfsrvd_nfsd+0x33c/frame 0xfffffe00747e9590=0A= >> nfssvc_nfsd() at nfssvc_nfsd+0x473/frame 0xfffffe00747e9aa0=0A= >> sys_nfssvc() at sys_nfssvc+0xc7/frame 0xfffffe00747e9ac0=0A= >> amd64_syscall() at amd64_syscall+0x12e/frame 0xfffffe00747e9bf0=0A= >> fast_syscall_common() at fast_syscall_common+0xf8/frame=0A= >> 0xfffffe00747e9bf0=0A= >> --- syscall (155, FreeBSD ELF64, sys_nfssvc), rip =3D 0x8011aa59a, rsp = =3D=0A= >> 0x7fffffffe4e8, rbp =3D 0x7fffffffe780 ---=0A= >> KDB: enter: panic=0A= >>=0A= >> __curthread ()=0A= >> at /share/dim/src/freebsd/src-dim/sys/amd64/include/pcpu_aux.h:55=0A= >> 55 __asm("movq %%gs:%P1,%0" : "=3Dr" (td) : "n" (offsetof(stru= ct pcpu,=0A= >> (kgdb) #0 __curthread ()=0A= >> at /share/dim/src/freebsd/src-dim/sys/amd64/include/pcpu_aux.h:55=0A= >> #1 doadump (textdump=3Dtextdump@entry=3D0)=0A= >> at /share/dim/src/freebsd/src-dim/sys/kern/kern_shutdown.c:399=0A= >> #2 0xffffffff804cca5a in db_dump (dummy=3D,=0A= >> dummy2=3D, dummy3=3D, dummy4=3D)=0A= >> at /share/dim/src/freebsd/src-dim/sys/ddb/db_command.c:575=0A= >> #3 0xffffffff804cc912 in db_command (last_cmdp=3D,=0A= >> cmd_table=3D, dopager=3Ddopager@entry=3D1)=0A= >> at /share/dim/src/freebsd/src-dim/sys/ddb/db_command.c:482=0A= >> #4 0xffffffff804cc58d in db_command_loop ()=0A= >> at /share/dim/src/freebsd/src-dim/sys/ddb/db_command.c:535=0A= >> #5 0xffffffff804cfd06 in db_trap (type=3D, code=3D> out>)=0A= >> at /share/dim/src/freebsd/src-dim/sys/ddb/db_main.c:270=0A= >> #6 0xffffffff80c69f17 in kdb_trap (type=3Dtype@entry=3D3, code=3Dcode@e= ntry=3D0,=0A= >> tf=3Dtf@entry=3D0xfffffe00747e88e0)=0A= >> at /share/dim/src/freebsd/src-dim/sys/kern/subr_kdb.c:727=0A= >> #7 0xffffffff810d7aee in trap (frame=3D0xfffffe00747e88e0)=0A= >> at /share/dim/src/freebsd/src-dim/sys/amd64/amd64/trap.c:576=0A= >> #8 =0A= >> #9 kdb_enter (why=3D0xffffffff812d3d27 "panic", msg=3D)= =0A= >> at /share/dim/src/freebsd/src-dim/sys/kern/subr_kdb.c:506=0A= >> #10 0xffffffff80c1d248 in vpanic (=0A= >> fmt=3D0xffffffff8129dfef "%s: expected nul at %p; string [%s]\n",=0A= >> ap=3D, ap@entry=3D0xfffffe00747e8a50)=0A= >> at /share/dim/src/freebsd/src-dim/sys/kern/kern_shutdown.c:907=0A= >> #11 0xffffffff80c1cfd3 in panic (=0A= >> fmt=3D0xffffffff81e9b9c8 "=3D\t)\201\377\377\377\377")= =0A= >> at /share/dim/src/freebsd/src-dim/sys/kern/kern_shutdown.c:843=0A= >> #12 0xffffffff80cfa992 in lookup (ndp=3Dndp@entry=3D0xfffffe00747e8d90)= =0A= >> at /share/dim/src/freebsd/src-dim/sys/kern/vfs_lookup.c:919=0A= >> #13 0xffffffff80b33f84 in nfsvno_namei (nd=3Dnd@entry=3D0xfffffe00747e91= 00,=0A= >> ndp=3Dndp@entry=3D0xfffffe00747e8d90, dp=3D,=0A= >> dp@entry=3D0xfffff80010544380, islocked=3D,=0A= >> islocked@entry=3D0,=0A= >> exp=3Dexp@entry=3D0xfffffe00747e8fd8, p=3Dp@entry=3D0xfffffe00bbfa30= 00,=0A= >> retdirp=3D0xfffffe00747e8e78)=0A= >> at /share/dim/src/freebsd/src-dim/sys/fs/nfsserver/nfs_nfsdport.c:59= 7=0A= >> #14 0xffffffff80b266a1 in nfsrvd_lookup (nd=3D0xfffffe00747e9100,=0A= >> isdgram=3D, dp=3D0xfffff80010544380,=0A= >> vpp=3D0xfffffe00747e9010,=0A= >> fhp=3D0xfffffe00747e9074, exp=3D0xfffffe00747e8fd8)=0A= >> at /share/dim/src/freebsd/src-dim/sys/fs/nfsserver/nfs_nfsdserv.c:60= 7=0A= >> #15 0xffffffff80b1073b in nfsrvd_compound (nd=3D0xfffffe00747e9100,=0A= >> isdgram=3D0,=0A= >> tag=3D0xf , taglen=3D6,= =0A= >> minorvers=3D4294967294)=0A= >> at=0A= >> /share/dim/src/freebsd/src-dim/sys/fs/nfsserver/nfs_nfsdsocket.c:1098=0A= >> #16 nfsrvd_dorpc (nd=3Dnd@entry=3D0xfffffe00747e9100,=0A= >> isdgram=3Disdgram@entry=3D0,=0A= >> tag=3D0xf , taglen=3D6,= =0A= >> minorvers=3D4294967294)=0A= >> at=0A= >> /share/dim/src/freebsd/src-dim/sys/fs/nfsserver/nfs_nfsdsocket.c:626=0A= >> #17 0xffffffff80b24c44 in nfs_proc (nd=3D0xfffffe00747e9100,=0A= >> xid=3D, xprt=3D0xfffff80003a14e00, rpp=3D)=0A= >> at /share/dim/src/freebsd/src-dim/sys/fs/nfsserver/nfs_nfsdkrpc.c:40= 2=0A= >> #18 nfssvc_program (rqst=3D0xfffff80010455800, xprt=3D0xfffff80003a14e00= )=0A= >> at /share/dim/src/freebsd/src-dim/sys/fs/nfsserver/nfs_nfsdkrpc.c:28= 8=0A= >> #19 0xffffffff80edead2 in svc_executereq (rqstp=3D0xfffff80010455800)=0A= >> at /share/dim/src/freebsd/src-dim/sys/rpc/svc.c:1037=0A= >> #20 svc_run_internal (grp=3D, grp@entry=3D0xfffff800100e6= 100,=0A= >> ismaster=3Dismaster@entry=3D1)=0A= >> at /share/dim/src/freebsd/src-dim/sys/rpc/svc.c:1313=0A= >> #21 0xffffffff80eddf80 in svc_run (pool=3D)=0A= >> at /share/dim/src/freebsd/src-dim/sys/rpc/svc.c:1392=0A= >> #22 0xffffffff80b251ec in nfsrvd_nfsd (td=3D,=0A= >> td@entry=3D0xfffffe00bbfa3000, args=3Dargs@entry=3D0xfffffe00747e966= 0)=0A= >> at /share/dim/src/freebsd/src-dim/sys/fs/nfsserver/nfs_nfsdkrpc.c:56= 1=0A= >> #23 0xffffffff80b3ec93 in nfssvc_nfsd (td=3D0xfffffe00bbfa3000,=0A= >> uap=3D)=0A= >> at=0A= >> /share/dim/src/freebsd/src-dim/sys/fs/nfsserver/nfs_nfsdport.c:3714=0A= >> #24 0xffffffff80e6f647 in sys_nfssvc (td=3D0xfffffe00bbfa3000,=0A= >> uap=3D0xfffffe00bbfa33e8)=0A= >> at /share/dim/src/freebsd/src-dim/sys/nfs/nfs_nfssvc.c:111=0A= >> #25 0xffffffff810d891e in syscallenter (td=3D)=0A= >> at=0A= >> /share/dim/src/freebsd/src-dim/sys/amd64/amd64/../../kern/subr_syscall.c= :189=0A= >> #26 amd64_syscall (td=3D0xfffffe00bbfa3000, traced=3D0)=0A= >> at /share/dim/src/freebsd/src-dim/sys/amd64/amd64/trap.c:1156=0A= >> #27 =0A= >> #28 0x00000008011aa59a in ?? ()=0A= >>=0A= >> Is anybody seeing this too? :)=0A= >>=0A= >> I can probably bisect, but it'll take quite a while.=0A= >>=0A= >> -Dimitry=0A= >>=0A= >>=0A= >=0A= >=0A= > --=0A= > Mateusz Guzik =0A= >=0A= =0A= =0A= --=0A= Mateusz Guzik =0A=