Tasks blocked in xlog_grant_log_space

[Dave Chinner]

On Fri, Feb 14, 2014 at 11:19:33AM -0500, Laurence Oberman wrote:
> Hello
> 
> I have a customer seeing multiple tasks blocked in xlog_grant_log_space
> This lands up hitting the hungtask timer for pdflush.
> 
> I have seen on the list that this issue is still out there.
> I also don't see outstanding I/O requests on the XFS file system that experienced this block.
> 
> The last hung_task timeout was on dm-9 
> ffff81011c78c080 ffff81081a43bc00 xfs    /dev/vgautocomp/lv_autocomp /bb/autocomp
> 
> crash> gendisk ffff810814d24400 | grep in_flight
>   in_flight = 0, 
> 
> So just wondering if I am hitting an existing bug or if its a new one.
> 
> This is an older 2.6.18 kernel

There's been lots of problems fixed in this area in the past seven
years. Your best bet is to upgrade to a more recent 3.x based kernel
where the known issues in this area have been resolved.

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com