Kernel Oops in NFS

[Jason.V.Mock@L-3Com.com]

We've come across an Oops, in what appears to NFS.

2.6.22.6 vanilla + realtime-lsm
RHEL4 over PXE/NFS_ROOT


Oct  9 14:26:13 WS15 gdm(pam_unix)[6038]: session opened for user mockj
by (uid=0)
Oct  9 14:26:48 WS15 gconfd (mockj-7583): starting (version 2.8.1), pid
7583 user 'mockj'
Oct  9 14:26:48 WS15 kernel: BUG: unable to handle kernel NULL pointer
dereference at virtual address 00000004
Oct  9 14:26:48 WS15 kernel:  printing eip:
Oct  9 14:26:48 WS15 kernel: c01a9fb8
Oct  9 14:26:48 WS15 kernel: *pde = c691d067
Oct  9 14:26:48 WS15 kernel: Oops: 0000 [#1]
Oct  9 14:26:48 WS15 kernel: PREEMPT SMP 
Oct  9 14:26:48 WS15 kernel: Modules linked in: lm85 w83781d hwmon_vid
hwmon ipv6 parport_pc lp parport autofs4 tulip dm_mirror dm_mod button
battery ac mct_u232 usbserial uhci_hcd ehci_hcd nvidia(P) e7xxx_edac
edac_mc rng_core i2c_i801 i2c_core aic79xx scsi_transport_spi ata_piix
libata scsi_mod snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm_oss
snd_mixer_oss snd_pcm snd_page_alloc snd_seq_dummy snd_seq_oss
snd_seq_midi_event snd_seq snd_timer snd_seq_device snd soundcore
realtime commoncap
Oct  9 14:26:48 WS15 kernel: CPU:    0
Oct  9 14:26:48 WS15 kernel: EIP:    0060:[<c01a9fb8>]    Tainted: P
VLI
Oct  9 14:26:48 WS15 kernel: EFLAGS: 00210246   (2.6.22-6.0.WSsmp #1)
Oct  9 14:26:48 WS15 kernel: EIP is at nfs_lookup+0x11b/0x26a
Oct  9 14:26:48 WS15 kernel: eax: 00000000   ebx: c0367600   ecx:
00000000   edx: 00000000
Oct  9 14:26:48 WS15 kernel: esi: 00000000   edi: 00000000   ebp:
00000000   esp: f63b5d44
Oct  9 14:26:48 WS15 kernel: ds: 007b   es: 007b   fs: 00d8  gs: 0033
ss: 0068
Oct  9 14:26:48 WS15 kernel: Process gconfd-2 (pid: 7583, ti=f63b4000
task=f6273070 task.ti=f63b4000)
Oct  9 14:26:48 WS15 kernel: Stack: f63b5d60 f63b5d98 f63b5d9c 7fffffff
f63b5ed8 f63ef118 f63f5e8c f63b0002 
Oct  9 14:26:48 WS15 kernel:        f63db21c 00000000 c014843e 00000000
0000000e 00000001 00000001 000081c0 
Oct  9 14:26:48 WS15 kernel:        00000002 00001459 000000c9 00000271
00000000 00002000 00000008 00000000 
Oct  9 14:26:48 WS15 kernel: Call Trace:
Oct  9 14:26:48 WS15 kernel:  [<c014843e>] write_cache_pages+0x235/0x285
Oct  9 14:26:48 WS15 kernel:  [<c01b4332>] nfs_flush_one+0x0/0xe5
Oct  9 14:26:48 WS15 kernel:  [<c01488c5>] mapping_tagged+0x2b/0x32
Oct  9 14:26:48 WS15 kernel:  [<c016e227>] d_alloc+0x15e/0x166
Oct  9 14:26:48 WS15 kernel:  [<c0166663>] lookup_one_len+0xc5/0xe0
Oct  9 14:26:48 WS15 kernel:  [<c01aabba>] nfs_sillyrename+0x12b/0x253
Oct  9 14:26:48 WS15 kernel:  [<c01aba09>] nfs_permission+0x0/0x147
Oct  9 14:26:48 WS15 kernel:  [<c01aae6e>] nfs_unlink+0x81/0xfc
Oct  9 14:26:48 WS15 kernel:  [<c01667f4>] may_delete+0x55/0x10a
Oct  9 14:26:48 WS15 kernel:  [<c0167a82>] vfs_unlink+0xa1/0xc5
Oct  9 14:26:48 WS15 kernel:  [<c0167b3b>] do_unlinkat+0x95/0xf5
Oct  9 14:26:48 WS15 kernel:  [<c0105a67>] do_syscall_trace+0x15c/0x19d
Oct  9 14:26:48 WS15 kernel:  [<c0103136>] syscall_call+0x7/0xb
Oct  9 14:26:48 WS15 kernel:  [<c0350000>] cache_make_upcall+0x40/0x129
Oct  9 14:26:48 WS15 kernel:  =======================
Oct  9 14:26:48 WS15 kernel: Code: 24 14 8b 00 83 c2 20 8b 58 38 8d 44
24 1c 89 04 24 8b 44 24 18 ff 53 20 83 f8 fe 0f 84 93 00 00 00 85 c0 89
c5 0f 88 3d 01 00 00 <8b> 76 04 8b 54 24 18 89 74 24 10 8b 82 a4 00 00
00 8b 54 24 64 
Oct  9 14:26:48 WS15 kernel: EIP: [<c01a9fb8>] nfs_lookup+0x11b/0x26a
SS:ESP 0068:f63b5d4

We haven't seen any negative side-effects other than users seeing this
in Kwrited quite often.  We've yet to update to 2.6.22.9, however we've
examined the change logs and patches associated with NFS between then
and now, and don't see anything appropriate for the errors we're
receiving.  Let me know if you need anything else for this...

Jason V. Mock
Software Engineer
L-3 Communications - Greenville Integrated Systems
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