Re: 2.6.39-rc3, 2.6.39-rc4: XFS lockup - regression since 2.6.38

[Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>]

On Fri, 29 April 2011 Bruno Prémont wrote:
> On Fri, 29 April 2011 Markus Trippelsdorf wrote:
> > On 2011.04.29 at 11:19 +1000, Dave Chinner wrote:
> > > OK, so the common elements here appears to be root filesystems
> > > with small log sizes, which means they are tail pushing all the
> > > time metadata operations are in progress. Definitely seems like a
> > > race in the AIL workqueue trigger mechanism. I'll see if I can
> > > reproduce this and cook up a patch to fix it.
> > 
> > Hmm, I'm wondering if this issue is somehow related to the hrtimer bug,
> > that Thomas Gleixner fixed yesterday:
> > http://git.us.kernel.org/?p=linux/kernel/git/tip/linux-2.6-tip.git;a=commit;h=ce31332d3c77532d6ea97ddcb475a2b02dd358b4
> > http://thread.gmane.org/gmane.linux.kernel.mm/61909/
> > 
> > It also looks similar to the issue that James Bottomley reported
> > earlier: http://thread.gmane.org/gmane.linux.kernel.mm/62185/ 
> 
> I'm going to see, I've applied Thomas' fix on the box seeing XFS freeze 
> (without
> other changes to kernel).
> Going to run that kernel for the week-end and beyond if it survives to see 
> what
> happens.

Happened again (after a few hours of uptime), so it definitely is not
caused by hrtimer bug that Thomas Gleixner fixed.

Bruno