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Re: xfs warnings on kernel 3.2.15

To: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Subject: Re: xfs warnings on kernel 3.2.15
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Sun, 12 Aug 2012 08:57:42 +1000
Cc: xfs@xxxxxxxxxxx
In-reply-to: <6314061.2K1xYxIYlT@saturn>
References: <1918987.4hlisJiio3@saturn> <20120809221518.GW2877@dastard> <6314061.2K1xYxIYlT@saturn>
User-agent: Mutt/1.5.21 (2010-09-15)
On Sat, Aug 11, 2012 at 12:50:45PM +0200, Michael Monnerie wrote:
> Am Freitag, 10. August 2012, 08:15:18 schrieb Dave Chinner:
> > The freeze/thaw deadlock is not fixed in 3.5 and i think it missed
> > 3.6 as well so you're going to be waiting until 3.7 for this to be
> > fixed, I suspect....
> OK, at least you guys have a plan for a fix. I'm happy to get that fixed 
> soon. Thank you.

It got included late in the 3.6-rc1 cycle, so it will be in 3.6.

> But when I think about it: Isn't that worth a backport fix? VMware isn't 
> a seldom used piece of software, and we use NetApp Storage with  
> snapshots, which is also used a lot worldwide. I can imagine others have 
> the same problem, or is it just me?

It's a problem that has been around for, well, since freeze was
first introduced many, many years ago. And the complexity of the fix
(20+ patch series, IIRC) makes it a difficult and time consuming fix
that requires a lot of testing - it touches the VFS and has changes
all through different filesystems, including XFS. I just can't see
anyone other than enterprise distro vendors spending that much
effort to back port such an intrusive fix....


Dave Chinner

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