linux-kernel - Re: bio linked list corruption.

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Message-ID: <9ba0cd0b-33f6-2156-aaf2-ad9ed9a00115@pmhahn.de>
Date:   Wed, 19 Oct 2016 19:09:46 +0200
From:   Philipp Hahn <pmhahn@...ahn.de>
To:     Chris Mason <clm@...com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jens Axboe <axboe@...com>,
        Dave Jones <davej@...emonkey.org.uk>,
        Al Viro <viro@...iv.linux.org.uk>, Josef Bacik <jbacik@...com>,
        David Sterba <dsterba@...e.com>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: bio linked list corruption.

Hello,

Am 19.10.2016 um 01:42 schrieb Chris Mason:
> 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@...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.

Nearly a month ago I reported also a "list_add corruption", but with 4.1.6:
<http://marc.info/?l=linux-kernel&m=147508265316854&w=2>

That server rungs Samba4, which also is a heavy user of xattr.

Might be that it is related.

Philipp Hahn