From: Brian Foster <bfoster@redhat.com>
To: Hrishikesh Barua <talonx@gmail.com>
Cc: xfs@oss.sgi.com
Subject: Re: Occassional problems with unfreeze
Date: Wed, 16 Jul 2014 08:47:58 -0400 [thread overview]
Message-ID: <20140716124757.GC36312@bfoster.bfoster> (raw)
In-Reply-To: <CAD2VtSjwu3eB+mrs2vX0G4+MJbHyNGVXvVR+P_ssNY6rydvijA@mail.gmail.com>
On Wed, Jul 16, 2014 at 04:50:22PM +0530, Hrishikesh Barua wrote:
> We use XFS on Amazon EBS on Ubuntu 12.04.3, kernel "3.2.0-54-virtual".
>
> Our backup scripts invoke "xfs_freeze -f" before taking a snapshot to
> ensure filesystem consistency. After the snapshot is taken, we invoke
> "xfs_freeze -u".
>
> Recently, we have observed that some of these unfreeze calls exit with code
> 255. This results in a frozen filesystem, processes queuing up and us
> having to reboot the EC2 instance. Invoking freeze -u manually results in
> multiple processes like this -
>
> 17628 ? D 0:00 /usr/sbin/xfs_io -F -r -p xfs_freeze -x -c
> thaw /mysql-vol-a
> 17694 ? D 0:00 /usr/sbin/xfs_io -F -r -p xfs_freeze -x -c
> thaw /mysql-vol-a
>
> A search on this list reveals at least one other instance of this problem -
> http://oss.sgi.com/archives/xfs/2013-01/msg00437.html
That one looks like a freeze hang whereas you see an unfreeze hang.
Perhaps similar to this:
https://bugzilla.redhat.com/show_bug.cgi?id=1052004
>
> No resolution seems to have happened there. Is this a known bug, or has it
> been fixed since (I'm running xfsprogs 3.1.7) ?
>
Do you have the hung task output for when this occurs (echo w >
/proc/sysrq-trigger)?
Brian
> Regards
> Hrish
> _______________________________________________
> xfs mailing list
> xfs@oss.sgi.com
> http://oss.sgi.com/mailman/listinfo/xfs
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next prev parent reply other threads:[~2014-07-16 12:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-16 11:20 Occassional problems with unfreeze Hrishikesh Barua
2014-07-16 12:47 ` Brian Foster [this message]
2014-07-16 13:23 ` Hrishikesh Barua
2014-09-25 6:07 ` Hrishikesh Barua
2014-09-25 7:18 ` Dave Chinner
2014-09-26 12:02 ` Hrishikesh Barua
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