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    SubjectRe: DEVFS broken?
    From
    Also using Debian sid here (devfsd 1.3.21-1). Over the past two days
    I've seen random nasties with devfs-v199.6 and v199.7 (I backed out
    v199.7 in my local tree because my machine refuses to finish booting
    otherwise). Machine: VIA VT82C693A/694x, PIII/1GHz SMP, 1GB HIGHMEM
    enabled.

    What follows is a series of crashes culled from /var/log/kern.log
    (apologies regarding the format). Before each I'll explain what I did to
    possibly invoke it. All are with devfs-v199.6 and devfsd-1.3.21 running
    2.4.18-pre4 + ext3-2.4-0.9.17-2418p3 + ide.2.4.16.12102001:

    # modprobe aic7xxx //I tried to start an Eterm in X 4.1.0.1 afterward
    -- snip --
    Jan 16 22:54:50 opeth kernel: invalid operand: 0000
    Jan 16 22:54:50 opeth kernel: CPU: 0
    Jan 16 22:54:50 opeth kernel: EIP: 0010:[d_instantiate+17/68]
    Tainted: P
    Jan 16 22:54:50 opeth kernel: EFLAGS: 00010202
    Jan 16 22:54:50 opeth kernel: eax: 5a5a5a00 ebx: f6b5f560 ecx:
    f7aa1b80 ed
    x: f6b5f590
    Jan 16 22:54:50 opeth kernel: esi: f7aa1b80 edi: f6b5f560 ebp:
    f7a7f840 es
    p: f7a41f18
    Jan 16 22:54:50 opeth kernel: ds: 0018 es: 0018 ss: 0018
    Jan 16 22:54:50 opeth kernel: Process devfsd (pid: 26,
    stackpage=f7a41000)
    Jan 16 22:54:50 opeth kernel: Stack: f77d9460 c0179b13 f6b5f560 f7aa1b80
    f6b5f56
    0 00000000 f7a41fa4 f7a83620
    Jan 16 22:54:50 opeth kernel: c01409be f6b5f560 00000000 f7a41f74
    c014118
    1 f7a83620 f7a41f74 00000000
    Jan 16 22:54:50 opeth kernel: f60d4000 00000000 f7a41fa4 00000009
    0000000
    9 f60d4005 00000000 f60d4004
    Jan 16 22:54:50 opeth kernel: Call Trace:
    [devfs_d_revalidate_wait+231/276] [cac
    hed_lookup+46/84] [link_path_walk+1409/2016] [path_walk+26/28]
    [__user_walk+53/8
    0]
    Jan 16 22:54:50 opeth kernel: [sys_stat64+25/112] [sys_read+188/196]
    [system_
    call+51/56]
    Jan 16 22:54:50 opeth kernel:
    Jan 16 22:54:50 opeth kernel: Code: 0f 0b f0 fe 0d a0 66 2d c0 0f 88 43
    09 00 00
    85 c9 74 12 8b
    Jan 16 23:09:25 opeth kernel: <7>VFS: Disk change detected on device
    ide1(22,0)
    Jan 16 23:55:23 opeth kernel: scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI
    HBA DRIV
    ER, Rev 6.2.4
    Jan 16 23:55:23 opeth kernel: <Adaptec aic7860 Ultra SCSI
    adapter>
    Jan 16 23:55:23 opeth kernel: aic7860: Ultra Single Channel A,
    SCSI Id=7
    , 3/253 SCBs
    Jan 16 23:55:23 opeth kernel:
    Jan 16 23:55:39 opeth kernel: Vendor: PLEXTOR Model: CD-ROM PX-40TS
    Rev:
    1.04
    Jan 16 23:55:39 opeth kernel: Type: CD-ROM
    ANSI
    SCSI revision: 02
    Jan 16 23:55:39 opeth kernel: Attached scsi CD-ROM sr0 at scsi0,
    channel 0, id 3
    , lun 0
    Jan 16 23:55:39 opeth kernel: (scsi0:A:3): 20.000MB/s transfers
    (20.000MHz, offs
    et 15)
    Jan 16 23:55:39 opeth kernel: sr0: scsi-1 drive
    Jan 16 23:59:45 opeth kernel: invalid operand: 0000
    Jan 16 23:59:45 opeth kernel: CPU: 1
    Jan 16 23:59:45 opeth kernel: EIP: 0010:[d_instantiate+17/68]
    Tainted: P
    Jan 16 23:59:45 opeth kernel: EFLAGS: 00010202
    Jan 16 23:59:45 opeth kernel: eax: 5a5a5a00 ebx: e7304660 ecx:
    e8d92e00 ed
    x: e7304690
    Jan 16 23:59:45 opeth kernel: esi: f742f520 edi: f7ea9140 ebp:
    e7304660 es
    p: ea08deb4
    Jan 16 23:59:45 opeth kernel: ds: 0018 es: 0018 ss: 0018
    Jan 16 23:59:45 opeth kernel: Process Eterm (pid: 4924,
    stackpage=ea08d000)
    Jan 16 23:59:45 opeth kernel: Stack: e8d92e00 c0179d4e e7304660
    e8d92e00 fffffff
    4 f7a7f840 ea08c000 e7304660
    Jan 16 23:59:45 opeth kernel: f7ea914c c0287c80 f3b1b600
    c0126938 f6fddb6
    0 f3b1b600 4038dc00 00000000
    Jan 16 23:59:45 opeth kernel: 00000246 00000000 f7a7f840
    f7a7f8a8 f7a8362
    0 00000246 c0149613 c200f288
    Jan 16 23:59:45 opeth kernel: Call Trace: [devfs_lookup+526/600]
    [handle_mm_faul
    t+92/184] [d_alloc+27/376] [real_lookup+122/264]
    [link_path_walk+1431/2016]
    Jan 16 23:59:45 opeth kernel: [path_walk+26/28] [__user_walk+53/80]
    [sys_stat
    64+25/112] [sys_ioctl+490/497] [system_call+51/56]
    Jan 16 23:59:45 opeth kernel:
    Jan 16 23:59:45 opeth kernel: Code: 0f 0b f0 fe 0d a0 66 2d c0 0f 88 43
    09 00 00
    85 c9 74 12 8b
    -- snip --

    //this one occurred during boot
    -- snip --
    Jan 17 00:07:47 opeth kernel: invalid operand: 0000
    Jan 17 00:07:47 opeth kernel: CPU: 0
    Jan 17 00:07:47 opeth kernel: EIP: 0010:[d_instantiate+17/68]
    Tainted: P
    Jan 17 00:07:47 opeth kernel: EFLAGS: 00010287
    Jan 17 00:07:47 opeth kernel: eax: 5a5a5a00 ebx: f7228540 ecx:
    f7215060 ed
    x: f7228570
    Jan 17 00:07:47 opeth kernel: esi: f7215060 edi: f7228540 ebp:
    f7a810c0 es
    p: f7a41f18
    Jan 17 00:07:47 opeth kernel: ds: 0018 es: 0018 ss: 0018
    Jan 17 00:07:47 opeth kernel: Process devfsd (pid: 26,
    stackpage=f7a41000)
    Jan 17 00:07:47 opeth kernel: Stack: f7252940 c0179b13 f7228540 f7215060
    f722854
    0 00000000 f7a41fa4 f7a82a20
    Jan 17 00:07:47 opeth kernel: c01409be f7228540 00000000 f7a41f74
    c014118
    1 f7a82a20 f7a41f74 00000000
    Jan 17 00:07:47 opeth kernel: f7854000 00000000 f7a41fa4 00000009
    0000000
    9 f7854005 00000000 f7854004
    Jan 17 00:07:47 opeth kernel: Call Trace:
    [devfs_d_revalidate_wait+231/276] [cac
    hed_lookup+46/84] [link_path_walk+1409/2016] [path_walk+26/28]
    [__user_walk+53/8
    0]
    Jan 17 00:07:47 opeth kernel: [sys_stat64+25/112] [sys_read+188/196]
    [system_
    call+51/56]
    Jan 17 00:07:47 opeth kernel:
    Jan 17 00:07:47 opeth kernel: Code: 0f 0b f0 fe 0d a0 66 2d c0 0f 88 43
    09 00 00 85 c9 74 12 8b
    -- snip --

    Interestingly enough, I applied rml's preempt-kernel-rml-2.4.18-pre4-1,
    recompiled, rebooted, and have yet to see an oops, though I believe it's
    just dumb luck thus far. Any ideas?

    On Thu, Jan 17, 2002 at 09:12:29AM -0800, Lawrence Walton wrote:
    > I am not sure how to debug this but it apears that
    > in 2.5.3-pre1 and in 2.5.2-dj1 DEVFS is not working.
    > It started by terminals hanging and not being able to
    > shutdown.
    > I went to /dev/ and did a ls, it compleatly hangs that
    > terminal and I cannot kill ls.
    > I have the devfsd version from debian 1.3.21 .

    --
    Dan Chen crimsun@email.unc.edu
    GPG key: www.unc.edu/~crimsun/pubkey.gpg.asc
    [unhandled content-type:application/pgp-signature]
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