Date: Tue, 18 Oct 2016 19:42:49 -0400
From: Chris Mason <clm@fb.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
CC: Jens Axboe <axboe@fb.com>, Dave Jones <davej@codemonkey.org.uk>,
        Al Viro <viro@zeniv.linux.org.uk>, Josef Bacik <jbacik@fb.com>,
        David Sterba <dsterba@suse.com>,
        linux-btrfs <linux-btrfs@vger.kernel.org>,
        Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: bio linked list corruption.
Message-ID: <20161018234248.GB93792@clm-mbp.masoncoding.com>
Mail-Followup-To: Chris Mason <clm@fb.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Jens Axboe <axboe@fb.com>, Dave Jones <davej@codemonkey.org.uk>,
        Al Viro <viro@zeniv.linux.org.uk>, Josef Bacik <jbacik@fb.com>,
        David Sterba <dsterba@suse.com>,
        linux-btrfs <linux-btrfs@vger.kernel.org>,
        Linux Kernel <linux-kernel@vger.kernel.org>
References: <20161011144507.okg6baqvodn2m2lh@codemonkey.org.uk>
 <20161018224205.bjgloslaxcej2td2@codemonkey.org.uk>
 <e9e28964-4540-6e95-b4b7-aafd509fd8bc@fb.com>
 <20161018233148.GA93792@clm-mbp.masoncoding.com>
 <CA+55aFz37uBqo9LG6pwRCB1pU94o3yz1SXwj3xwzHRXtg5Cgyw@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; format=flowed
Content-Disposition: inline
In-Reply-To: <CA+55aFz37uBqo9LG6pwRCB1pU94o3yz1SXwj3xwzHRXtg5Cgyw@mail.gmail.com>
User-Agent: Mutt/1.5.24 (2015-08-30)
SpamDiagnosticOutput: 1:99
SpamDiagnosticMetadata: NSPM
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Oct 2016 23:44:58.1733 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR15MB1248
X-OriginatorOrg: fb.com
X-Proofpoint-Spam-Reason: safe
X-FB-Internal: Safe
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-10-18_12:,,
 signatures=0
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 689
Lines: 19

On Tue, Oct 18, 2016 at 04:39:22PM -0700, Linus Torvalds wrote:
>On Tue, Oct 18, 2016 at 4:31 PM, Chris Mason <clm@fb.com> wrote:
>>
>> Jens, not sure if you saw the whole thread.  This has triggered bad page
>> state errors, and also corrupted a btrfs list.  It hurts me to say, but it
>> might not actually be your fault.
>
>Where is that thread, and what is the "this" that triggers problems?
>
>Looking at the "->mq_list" users, I'm not seeing any changes there in
>the last year or so. So I don't think it's the list itself.

Seems to be the whole thing:

http://www.gossamer-threads.com/lists/linux/kernel/2545792

My guess is xattr, but I don't have a good reason for that.

-chris