> 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...
I was just checking to see if there's anything that I'm missing here, in
regards to never hearing a single thing back about this.
- Jason Mock
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