XFS Freezing occasionally hangs

[Ryan Campbell]

Is there any additional information I can provide to debug this issue? We
are seeing it quite often.


On Thu, Jan 24, 2013 at 9:38 AM, Ryan Campbell <ryan.campbell at gmail.com>wrote:

> We use XFS on EC2 EBS running on Arch Linux (kernel 3.6.7-1-ARCH). Before
> we take an EC2 snapshot, we call xfs_freeze on the mount so that we can
> have a consistent snapshot.
>
> On instances running for around 30 days, we see the XFS freeze hang,
> resulting in a skyrocketing load (but not CPU). We can't kill the
> xfs_freeze process. The only route available is usually to force a reboot
> of the server without cleaning unmounting.
>
> There are backtraces in dmesg complaining both of hung xfs processes, and
> hung java processes. https://gist.github.com/3d46830eac52df44d30f
>
> Is this a known issue? We call xfs_freeze quite often on thousands of XFS
> volumes, so I wouldn't be surprised if we have encountered an edge case
> considering how often we do this.
>
> Any help appreciated. I'm recampbell on #xfs/freenode.
>
> Thanks,
> Ryan
>
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