quota deadlock on 6.1-RC1

Kris Kennaway kris at obsecurity.org
Tue May 2 17:59:08 UTC 2006

On Tue, May 02, 2006 at 09:44:29PM +0400, Dmitriy Kirhlarov wrote:
> Hi!
> On Tue, May 02, 2006 at 01:22:26PM -0400, Kris Kennaway wrote:
> > > I think it's same problem as in thread "fsck_ufs locked in snaplk".
> > > Is this problem fixed in fresh 6.1-PRE?
> > 
> > I think we've reproduced the problem, but it probably won't be fixed
> > before the release.  Sorry, the bug reports came too late in the
> > release cycle.
> Imho, it's bad idea -- create release with so important bug. It's not
> coda, unionfs or something else. It's very useful.
> I think, postpone release for fix this issue -- more fine.

The release cycle has been in progress for over 3 months, and based on
our understanding of the problems there is little chance of a quick
fix for this issue even if the decision was made to delay the release

Let me point out something important, which ties in to Scott's recent

On February 21 -- that is over 2 months ago -- I sent email to this
list containing a fix for the quota deadlocks that were known at the
time.  I got minimal response from users, but it was uniformly
positive.  The fix was committed, and the status of the "quota
deadlocks" item on the 6.1-RELEASE todo list was changed from "must
fix" to "believed fixed, please test".

The next I heard about the problem was about a week ago when someone
reported another deadlock and several others chimed in with "oh yeah,
it still deadlocks for me too".

Well, sorry folks, you should have told me in February.  Or if you
only found out about the problem a week ago, you need to recognize
that problems raised at the last minute cannot always be fixed

The best we can do now is provide a patch when the fix is available,
and with the agreement of the release engineers it may be possible to
commit the fix to the errata/security branch at a later date.

In the meantime, the best advice is to avoid snapshots on busy systems
(with or without quotas, they both can deadlock).

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