Re: [FYI] "kernel BUG at fs/nfs/inode.c:152!"

[Kirill Korotaev <dev@sw.ru>]

Hello Ian,

This looks very much like the problem in iget() I described today in 
LKML. Hope I'll post a patch here soon.

Kirill

> When my networking card died yesterday (sundance based d-link card) i
> used dhclient to update the route. Unfortunately it caused it to change
> ip, thus today i had some NFS problems...
> 
> fstab entry:
> blue:/mnt/large /mnt/large      nfs    
> user,async,soft,rsize=32768,wsize=32768,tcp     0 0
> 
> Anyways, i did a bunch of umount -f's and so on and so forth as i have
> done a million times before, but when i tried remounting it, nothing
> happened... A quick ps aux |grep revealed:
> 
> root     26793  0.0  0.0  1740  696 ?        D    14:23   0:00
> /bin/umount /mnt/large
> root     26800  0.0  0.0  1868  828 ?        D    14:23   0:00
> /bin/mount /mnt/large
> root     26805  0.0  0.0  1868  828 ?        D    14:23   0:00
> /bin/mount /mnt/large
> root     26807  0.0  0.0  1868  828 ?        D    14:23   0:00
> /bin/mount /mnt/large
> root     26809  0.0  0.0  1868  828 ?        D    14:23   0:00
> /bin/mount /mnt/large
> 
> And to further my agony a dmesg revealed:
> 
> ------------[ cut here ]------------
> kernel BUG at fs/nfs/inode.c:152!
> invalid operand: 0000 [#1]
> Modules linked in: nls_cp437 vfat fat floppy nvidia twofish serpent blowfish sha256 crypto_null ip6table_filter ip6_tables forcedethCPU:    0
> EIP:    0060:[<c01a8bb0>]    Tainted: P   VLI
> EFLAGS: 00210286   (2.6.9-rc1-bk7)
> EIP is at nfs_clear_inode+0x50/0x70
> eax: ffffffff   ebx: f70595a8   ecx: edc36c60   edx: f710cf60
> esi: f7059490   edi: 000000ce   ebp: c042792c   esp: c05cbf04
> ds: 007b   es: 007b   ss: 0068
> Process umount (pid: 26773, threadinfo=c05ca000 task=df308bb0)
> Stack: 00000002 f70595a8 c05cbf2c c016058d f70595a8 c01605dc 00000000 c1bff64c
>        c1bff600 c0160736 c05cbf2c c05cbf2c c1bff600 c1bff64c c042a460 c05ca000
>        c01506f5 ef95c000 00000015 c042a5a0 08050278 c0150dd9 f7e8cc00 c01ab2dc
> Call Trace:
>  [<c016058d>] clear_inode+0x8d/0xa0
>  [<c01605dc>] dispose_list+0x3c/0x70
>  [<c0160736>] invalidate_inodes+0x66/0x80
>  [<c01506f5>] generic_shutdown_super+0x55/0x100
>  [<c0150dd9>] kill_anon_super+0x9/0x20
>  [<c01ab2dc>] nfs_kill_super+0xc/0x70
>  [<c0150623>] deactivate_super+0x43/0x60
>  [<c0162e4b>] sys_umount+0x3b/0x90
>  [<c03a693d>] schedule+0x27d/0x450
>  [<c0103db9>] sysenter_past_esp+0x52/0x71
> Code: d4 39 43 d4 75 2f 8b 86 b4 00 00 00 85 c0 74 05 e8 f6 f8 1e 00 8b 86 ac 00 00 00 85 c0 75 0c 8b 5c 24 04 8b 74 24 08 83 c4 0c c3 <0f> 0b 98 00 7a 28 3c c0 eb ea 0f 0b 94 00 7a 28 3c c0 eb c7 8d
> 
> This is, as stated before, just FYI... Anyone feeling like making nvidia
> comments can read this and just skip mailing "/me no care".
> 
> CC, Since i'm not subbed.