cvs commit: src/sys/dev/md md.c

[John Baldwin]

On Tuesday 25 January 2005 04:37 am, Poul-Henning Kamp wrote:
> In message <20050124134546.GB59685 at obiwan.tataz.chchile.org>, Jeremie Le Hen 
writes:
> >While talking about WITNESS, I checked my kernel config and remembered
> >that FULL_PREEMPTION is on.  The panic disappeared when I turned off
> >the latter : I managed to create up to about 16 md(4) devices.  I know
> >this should not be enabled for users, but I'm interested in "exposing
> >race conditions" as said in the comment.
>
> Well, you clearly did :-)
>
> I suggest you send a summary of what you have found to jhb at freebsd.org,
> he's working on the FULL_PREEMPTION stuff.

FULL_PREEMPTION just preempts more often is all.  It's still probably a 
locking bug of some sort.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org