RE: [Xen-devel] [PATCH] xen mmu: fix a race window causing leave_mm BUG()

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2011-05-11 at 02:20 +0100, Tian, Kevin wrote:
> > From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx]
> > Sent: Wednesday, May 11, 2011 4:27 AM
> > 
> > On Fri, Apr 29, 2011 at 12:10:57PM +0800, Tian, Kevin wrote:
> > >     xen mmu: fix a race window causing leave_mm BUG()
> > 
> > I've this in mailbox and I am wondering whether this still an issue with the
> > 2.6.39 type kernels?
> > How do you reproduce the failure? When using LVM?
> 
> this issue is reported by Xiaoyun when he did extensive test which happened
> occasionally after dozen of hours running. From the phenomenon and info
> provided by Xiaoyun, I found this potential race window and Xiaoyun has
> verified this patch solving his stability issue.
> 
> the original thread is at:
> http://lists.xensource.com/archives/html/xen-devel/2011-04/msg01186.html
> 
> his kernel is based on 2.6.38, and I checked latest 2.6.39 from your 
> maintained
> repo, and same issue still exists.
> 
> btw, I didn't reproduce it myself, and not sure whether Xiaoyun uses LVM. But
> I think it has nothing to do with storage type, and a pure mmu design issue.

Is there a specific stack trace (or two) which is associated with this
bug? I'm wondering if http://bugs.debian.org/613073 might be the same
thing...

Ian.


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