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Re: XFS WARN_ON in xfs_vm_writepage

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: XFS WARN_ON in xfs_vm_writepage
From: Dave Jones <davej@xxxxxxxxxx>
Date: Fri, 13 Jun 2014 10:19:25 -0400
Cc: xfs@xxxxxxxxxxx, Linux Kernel <linux-kernel@xxxxxxxxxxxxxxx>, linux-mm@xxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20140613062645.GZ9508@dastard>
Mail-followup-to: Dave Jones <davej@xxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx, Linux Kernel <linux-kernel@xxxxxxxxxxxxxxx>, linux-mm@xxxxxxxxx
References: <20140613051631.GA9394@xxxxxxxxxx> <20140613062645.GZ9508@dastard>
User-agent: Mutt/1.5.23 (2014-03-12)
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

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