LVM volume with XFS file system hanged

[Christoph Hellwig]

On Fri, Mar 23, 2012 at 02:19:05PM +0530, Supratik Goswami wrote:
> Hi
> 
> Our current system is running Ubuntu 10.04 with a the below kernel version.
> 
> root at ip-10-0-1-117:~# cat /etc/issue
> Ubuntu 10.04.4 LTS \n \l
> 
> root at ip-10-0-1-117:~# uname -a
> Linux ip-10-0-1-117 2.6.32-343-ec2 #45-Ubuntu SMP Tue Feb 14 18:18:17
> UTC 2012 x86_64 GNU/Linux
> 
> We have an LVM volume which is using XFS filesystem. We found the
> below call trace in /var/log/messages when it was unresponsive.
> 
> Can anyone please tell me what went wrong ?

Device mapper is hanging for some reason, and XFS waits for it to
finish.