oops in close when exiting fsx

[Steve French <smfrench@austin.rr.com>]

ctl-c exiting fsx after a few hours with 2.6.18-rc4 got the following 
oops - anyone recognize it?
Although I didn't see cifs symbols on the call stack it is running on a 
cifs mount, but it is not
one I have seen before.

BUG: unable to handle kernel NULL pointer dereference at virtual address 
0000000 0
printing eip:
c133064f
*pde = 00000000
Oops: 0002 [#1]
Modules linked in: cifs nfsd exportfs lockd nfs_acl ipv6 sunrpc 
snd_pcm_oss snd_ mixer_oss snd_seq snd_seq_device af_packet edd ibm_acpi 
snd_intel8x0 snd_ac97_co dec snd_ac97_bus snd_pcm snd_timer snd 
soundcore snd_page_alloc
CPU:    0
EIP:    0060:[<c133064f>]    Not tainted VLI
EFLAGS: 00210002   (2.6.18-rc4-default #1)
EIP is at __down+0x56/0xc5
eax: f7708b6c   ebx: f7708b64   ecx: 00000000   edx: f5f77f04
esi: f5f5e030   edi: 00200246   ebp: 00000000   esp: f5f77ed8
ds: 007b   es: 007b   ss: 0068
Process fsx-linux (pid: 4038, ti=f5f76000 task=f5f5e030 task.ti=f5f76000)
Stack: 00000000 00000000 00000000 00000000 00000000 f76e24a0 00000000 
c1038908
      00000001 f5f5e030 c1013678 f7708b6c 00000000 f7708b40 f609f600 
f7708b64
      c132ed37 dff49a40 f5f76000 fa2da685 f611f8c0 f5a5406c 03240e72 
00000008
Call Trace:
[<c1038908>] mempool_free+0x43/0x46
[<c1013678>] default_wake_function+0x0/0xc
[<c132ed37>] __down_failed+0x7/0xc
[<fa2da685>] .text.lock.file+0x87/0x9a [cifs]
[<c104e807>] __fput+0xab/0x148
[<c104c453>] filp_close+0x4e/0x54
[<c101773a>] put_files_struct+0x64/0xa6
[<c1018581>] do_exit+0x1c7/0x675
[<c10052b0>] do_syscall_trace+0x12b/0x172
[<c1018a8b>] sys_exit_group+0x0/0xd
[<c1002abf>] syscall_call+0x7/0xb
Code: 89 74 24 24 c7 44 24 28 78 36 01 c1 c7 06 02 00 00 00 9c 5f fa 83 
4c 24 20  01 8d 43 08 8b 48 04 8d 54 24 2c 89 50 04 89 44 24 2c <89> 11 
ff 43 04 89 4c 24  30 8b 43 04 48 01 03 0f 98 c0 84 c0 75
EIP: [<c133064f>] __down+0x56/0xc5 SS:ESP 0068:f5f77ed8
<3>BUG: sleeping function called from invalid context at kernel/rwsem.c:20
in_atomic():0, irqs_disabled():1
[<c1026618>] down_read+0x12/0x1f
[<c101fcc8>] blocking_notifier_call_chain+0xe/0x29
[<c10183d6>] do_exit+0x1c/0x675
[<c101695e>] printk+0x14/0x18
[<c1003dcd>] die+0x206/0x20e
[<c13315bf>] do_page_fault+0x3ea/0x4b8
[<c13311d5>] do_page_fault+0x0/0x4b8
[<c10035d1>] error_code+0x39/0x40
[<c133064f>] __down+0x56/0xc5
[<c1038908>] mempool_free+0x43/0x46
[<c1013678>] default_wake_function+0x0/0xc
[<c132ed37>] __down_failed+0x7/0xc
[<fa2da685>] .text.lock.file+0x87/0x9a [cifs]
[<c104e807>] __fput+0xab/0x148
[<c104c453>] filp_close+0x4e/0x54
[<c101773a>] put_files_struct+0x64/0xa6
[<c1018581>] do_exit+0x1c7/0x675
[<c10052b0>] do_syscall_trace+0x12b/0x172
[<c1018a8b>] sys_exit_group+0x0/0xd
[<c1002abf>] syscall_call+0x7/0xb
Fixing recursive fault but reboot is needed!

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