XFS / writeback invoking soft lockup.

[Dave Jones]

On Fri, Dec 13, 2013 at 03:16:39AM -0800, Christoph Hellwig wrote:
 > On Fri, Dec 13, 2013 at 09:48:53PM +1100, Dave Chinner wrote:
 > > All I can say is that there doesn't look to be any obvious signs
 > > that this is a XFS or writeback problem fom the stack trace, and
 > > without more information or a reproducable test case I'm not going
 > > to be able to understand the cause.
 > > 
 > > Is the problem reproducable, or is it just a one-off?
 > 
 > If it's reproducable it would be good to enable the xfs_writepage
 > tracepoint and get a trace-cmd log of it.

I hit it pretty reliably last night.  I'll make a note to look into it 
on monday with that enabled.

	Dave