linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Al Viro <viro@ZenIV.linux.org.uk>
To: Dave Jones <davej@codemonkey.org.uk>, Chris Mason <clm@fb.com>,
	Josef Bacik <jbacik@fb.com>, David Sterba <dsterba@suse.com>,
	linux-btrfs@vger.kernel.org,
	Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: btrfs_direct_IO oops
Date: Mon, 10 Oct 2016 16:55:03 +0100	[thread overview]
Message-ID: <20161010155503.GZ19539@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20161010131122.cjmoof6yblwl7tak@codemonkey.org.uk>

On Mon, Oct 10, 2016 at 09:11:22AM -0400, Dave Jones wrote:

> My compiler choked on that, but I fixed it up. The printk didn't
> trigger though..
> 
> idx = 0, offset = 0
> curbuf = 0, nrbufs = 1, buffers = 16
> [ffffffffb9a21100 ffffea00126019c0 0 4096]
> [          (null) ffffea0013746440 0 0]
> [          (null) ffffea00132956c0 0 0]
> [          (null) ffffea0013295700 0 0]
> [          (null) ffffea0013295740 0 0]
> [          (null) ffffea0013295780 0 0]
> [          (null) ffffea00132957c0 0 0]
> [          (null) ffffea0013595c00 0 0]
> [          (null) ffffea0012b1b6c0 0 0]
> [          (null)           (null) 0 0]
> [          (null)           (null) 0 0]
> [          (null)           (null) 0 0]
> [          (null)           (null) 0 0]
> [          (null)           (null) 0 0]
> [          (null)           (null) 0 0]
> [          (null)           (null) 0 0]
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 13581 at lib/iov_iter.c:327 sanity+0x102/0x150
> CPU: 1 PID: 13581 Comm: trinity-c17 Not tainted 4.8.0-think+ #9 
>  ffffc90000963ae8
>  ffffffffb93e22d1
>  0000000000000000
>  0000000000000000
> 
>  ffffffffb9c1e1cb
>  ffffffffb93fa5b2
>  ffffc90000963b28
>  ffffffffb908b010
> 
>  00000147d43c0e7f
>  ffffffffb9c1e1cb
>  0000000000000147
>  0000000000000010

What are these from?  Confused...

> Call Trace:

[via splice_direct_to_actor()]

Hmmm...  I think I see it.  Could you try the following (on top of debugging
in lib/iov_iter.c) and see if anything triggers?

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index bfc2aa7..b63d8c5 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -319,7 +319,7 @@ xfs_file_dio_aio_read(
 	data = *to;
 	ret = __blockdev_direct_IO(iocb, inode, target->bt_bdev, &data,
 			xfs_get_blocks_direct, NULL, NULL, 0);
-	if (ret > 0) {
+	if (ret >= 0) {
 		iocb->ki_pos += ret;
 		iov_iter_advance(to, ret);
 	}
diff --git a/mm/filemap.c b/mm/filemap.c
index 68f1813..88e5ddd 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1935,7 +1935,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 		file_accessed(file);
 
 		retval = mapping->a_ops->direct_IO(iocb, &data);
-		if (retval > 0) {
+		if (retval >= 0) {
 			iocb->ki_pos += retval;
 			iov_iter_advance(iter, retval);
 		}

  reply	other threads:[~2016-10-10 15:55 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-08 18:08 btrfs_direct_IO oops Dave Jones
2016-10-08 18:29 ` Al Viro
2016-10-08 23:20   ` Dave Jones
2016-10-09 15:11     ` Dave Jones
2016-10-10  3:43       ` Al Viro
2016-10-10 13:11         ` Dave Jones
2016-10-10 15:55           ` Al Viro [this message]
2016-10-10 17:17             ` Dave Jones

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20161010155503.GZ19539@ZenIV.linux.org.uk \
    --to=viro@zeniv.linux.org.uk \
    --cc=clm@fb.com \
    --cc=davej@codemonkey.org.uk \
    --cc=dsterba@suse.com \
    --cc=jbacik@fb.com \
    --cc=linux-btrfs@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).