From: Dave Chinner <david@fromorbit.com>
To: Dave Jones <davej@codemonkey.org.uk>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
Al Viro <viro@ZenIV.linux.org.uk>,
Linux Kernel <linux-kernel@vger.kernel.org>,
linux-xfs@vger.kernel.org
Subject: Re: iov_iter_pipe warning.
Date: Thu, 7 Sep 2017 09:46:17 +1000 [thread overview]
Message-ID: <20170906234617.GW17782@dastard> (raw)
In-Reply-To: <20170906200337.b5wj3gpfebliindw@codemonkey.org.uk>
On Wed, Sep 06, 2017 at 04:03:37PM -0400, Dave Jones wrote:
> On Mon, Aug 28, 2017 at 09:25:42PM -0700, Darrick J. Wong wrote:
> > On Mon, Aug 28, 2017 at 04:31:30PM -0400, Dave Jones wrote:
> > > I'm still trying to narrow down an exact reproducer, but it seems having
> > > trinity do a combination of sendfile & writev, with pipes and regular
> > > files as fd's is the best repro.
> > >
> > > Is this a real problem, or am I chasing ghosts ? That it doesn't happen
> > > on ext4 or btrfs is making me wonder...
> >
> > <shrug> I haven't heard of any problems w/ directio xfs lately, but OTOH
> > I think it's the only filesystem that uses iomap_dio_rw, which would
> > explain why ext4/btrfs don't have this problem.
>
> Another warning, from likely the same root cause.
>
> WARNING: CPU: 3 PID: 572 at lib/iov_iter.c:962 iov_iter_pipe+0xe2/0xf0
WARN_ON(pipe->nrbufs == pipe->buffers);
* @nrbufs: the number of non-empty pipe buffers in this pipe
* @buffers: total number of buffers (should be a power of 2)
So that's warning that the pipe buffer is already full before we
try to read from the filesystem?
That doesn't seem like an XFS problem - it indicates the pipe we are
filling in generic_file_splice_read() is not being emptied by
whatever we are splicing the file data to....
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2017-09-06 23:46 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170412152600.GP29622@ZenIV.linux.org.uk>
[not found] ` <20170412162709.bn5qfk4seues3yos@codemonkey.org.uk>
[not found] ` <20170412170723.GQ29622@ZenIV.linux.org.uk>
[not found] ` <20170412190318.srkkdytf2ebrjzrg@codemonkey.org.uk>
[not found] ` <20170421175430.GT29622@ZenIV.linux.org.uk>
[not found] ` <20170428152955.mafs3f22srmm34aw@codemonkey.org.uk>
[not found] ` <20170428164313.GK29622@ZenIV.linux.org.uk>
[not found] ` <20170428165024.ofyl2atpjwohekqa@codemonkey.org.uk>
[not found] ` <20170428172024.GL29622@ZenIV.linux.org.uk>
[not found] ` <20170807201818.kykqzexce6ap6aik@codemonkey.org.uk>
2017-08-28 20:31 ` iov_iter_pipe warning Dave Jones
2017-08-29 4:25 ` Darrick J. Wong
2017-08-30 17:05 ` Dave Jones
2017-08-30 17:13 ` Darrick J. Wong
2017-08-30 17:17 ` Dave Jones
2017-09-06 20:03 ` Dave Jones
2017-09-06 23:46 ` Dave Chinner [this message]
2017-09-07 3:48 ` Dave Jones
2017-09-07 4:33 ` Al Viro
2017-09-08 1:04 ` Al Viro
2017-09-10 1:07 ` Dave Jones
2017-09-10 2:57 ` Al Viro
2017-09-10 16:07 ` Dave Jones
2017-09-10 20:05 ` Al Viro
2017-09-10 20:07 ` Dave Jones
2017-09-10 20:33 ` Al Viro
2017-09-10 21:11 ` Dave Chinner
2017-09-10 21:19 ` Al Viro
2017-09-10 22:08 ` Dave Chinner
2017-09-10 23:07 ` Al Viro
2017-09-10 23:15 ` Al Viro
2017-09-11 0:31 ` Dave Chinner
2017-09-11 3:32 ` Al Viro
2017-09-11 6:44 ` Dave Chinner
2017-09-11 20:07 ` Al Viro
2017-09-11 20:17 ` Al Viro
2017-09-12 6:02 ` Dave Chinner
2017-09-12 11:13 ` Al Viro
2017-09-11 12:07 ` Christoph Hellwig
2017-09-11 12:51 ` Al Viro
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