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Bug: 2.2.20pre/ext3 0.0.7a crash apparently in sys_close()

Apologies for a vague and wooly bug report, but I can't reproduce this
on my test systems - I *can* reproduce it on some production ones like a
flash.... but that seems to upset our operations guys :-(

I am getting a set of crashes on some boxes in the field, apparently
related to high network traffic (this only occurs on boxes with ethernet
connectivity back to the centre rather than the majority of boxes which
have E1 connectivity back), and when the boxes are under network load.
The boxes have several filesystems on a h/w RAID controller, all of
which are ext3 except /boot.   There should be *very* little disk
traffic on these boxes in normal use, including small amounts of syslog.

The kernel is a 2.2.20pre - the couple of messages here are from
2.2.20pre8 - which also has FreeSWAN 1.91 and RAID stuff patched in
(however on all of these boxes RAID is not in use since the h/w has
onboard h/w RAID).

A kernel which has 0.0.7a ext3 dies in this situation.
A kernel which has 0.0.6b ext3 works without fault.

The death message is:-
Unable to handle kernel NULL pointer dereference at virtual address
current->tss.cr3 = 0ddf6000, %cr3 = 0ddf6000
*pde = 00000000
Entering kdb due to panic @ 0xc9124fe3
eax = 0x00000006  ebx = 0x00000004  ecx = 0xcdf32000  edx = 0x00000000
esi = 0x00000000  edi = 0xfffffff7  esp = 0xcdf32000  eip = 0xc0124fe3
ebp = 0xbffffca0   ss = 0x00000000   cs = 0x00000010  eflags =
ds = 0x00000018   es = 0x00000018  origeax = 0xffffffff  &regs =

[NB These boxes have Compaq Remote Insight consoles - so this message is
retyped from a jpg of the console output :-(    Nothing makes it into

backtrace and checks against System.map show this to be in sys_close()
A few other bombs have also been mostly in sys_close with a couple of
others within schedule().


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