rwatson at FreeBSD.org
Tue Aug 1 13:32:00 UTC 2006
On Tue, 25 Jul 2006, Graham Menhennitt wrote:
>>> Fatal trap 12: page fault while in kernel mode
>>>> current process = 479 (mountd)
>> I have the same panic reproducibly. Shutting off nfs_server_enable (i.e.
>> mountd) in rc.conf prevents it. This is with 6-STABLE cvsupped yesterday.
>> I'll get some more info and follow up the PR.
> I rebuilt my kernel (to enable debugging) and now it doesn't panic. So it
> seems that an old kernel (from around the end of May) with a new mountd
> (from Sunday) will crash. But a new kernel with a new mountd won't.
FYI, I've managed to reproduce this on a 7-CURRENT kernel, so will try to take
a look at this in detail in the next few days. It looks like a race during
socket connect/accept for UNIX domain sockets, likely involving simultaneous
close, which may be a sign of a bug in mountd (or the like) that triggers it.
Of course, the kernel shouldn't panic under those circumstances. :-)
Robert N M Watson
University of Cambridge
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