XFS WARN_ON in xfs_vm_writepage

[Dave Jones]

On Fri, Jun 13, 2014 at 04:26:45PM +1000, Dave Chinner wrote:

> >  970         if (WARN_ON_ONCE((current->flags & (PF_MEMALLOC|PF_KSWAPD)) ==
> >  971                         PF_MEMALLOC))
>
> What were you running at the time? The XFS warning is there to
> indicate that memory reclaim is doing something it shouldn't (i.e.
> dirty page writeback from direct reclaim), so this is one for the mm
> folk to work out...

Trinity had driven the machine deeply into swap, and the oom killer was
kicking in pretty often. Then this happened.

	Dave