From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tejun Heo <tj@kernel.org>
Subject: Re: Race condition between "read CFQ stats" and "block device
 shutdown"
Date: Thu, 26 Sep 2013 10:20:44 -0400
Message-ID: <20130926142044.GC3482@htj.dyndns.org>
References: <CAOMFOmXJ5ZTYdOvdUt-oxsouhPGRmMshCRhn6AFgmFAGZw5WZA@mail.gmail.com>
 <5226D661.7070301@suse.de>
 <CAOMFOmUCqXN1uaqBEWH3PStuZXvnvLw=YrARgv7DvqO6Y4bFPQ@mail.gmail.com>
 <20130904160723.GC26609@mtj.dyndns.org>
 <CAOMFOmWWfxCZ7ND_Vso4UkSEOqGm=o-xsqrfrj5MKdf9_jr1gA@mail.gmail.com>
 <20130926135443.GC2480@htj.dyndns.org>
 <5244423A.2050107@suse.de>
Mime-Version: 1.0
Return-path: <linux-scsi-owner@vger.kernel.org>
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=sender:date:from:to:cc:subject:message-id:references:mime-version
         :content-type:content-disposition:in-reply-to:user-agent;
        bh=YtgFxeITG8Z9XKWCYNRaNedDpOvFgALUk0ENFtYwlEE=;
        b=jZrwWa3mlVxXfy3/98DpGVUsUplyjsfcugHsqnk17p/iYmKQVF710TY53vEsi5mpYh
         0qVxyfGYqcl8Ld8Lvgm7vmnDdN+XEerAusyxFErlt3QIjoYV4TdixByHNGVsGoIgVb8c
         +ztDxIJCDkBHHDees3Jx43puOia+jtLsQfOr1Zpvm0AA1owO6sQX0GRGiWDYrW0xT0Lk
         4mPVL1a51QajHY3JRJJxzl1XZYvWBCMuw4do0TajJSEQKzo54qS9rELoH6U/E5JXLoLV
         BTuZGSve9ejXLQYzJhlSspLKK5ITCo9Hvqpen99nAoqIon9wYgwcPW/+LKdHs9VxBjOl
         Bh7g==
Content-Disposition: inline
In-Reply-To: <5244423A.2050107@suse.de>
Sender: linux-scsi-owner@vger.kernel.org
List-ID: <cgroups.vger.kernel.org>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: Hannes Reinecke <hare@suse.de>
Cc: Anatol Pomozov <anatol.pomozov@gmail.com>, Cgroups <cgroups@vger.kernel.org>, Jens Axboe <axboe@kernel.dk>, linux-scsi@vger.kernel.org

Hey, Hannes.

On Thu, Sep 26, 2013 at 04:18:34PM +0200, Hannes Reinecke wrote:
> However, none of the modern devices should be using this lock
> switching, so I would just ignore it.
> EG SCSI most definitely doesn't use it.

The kernel is crashing from it, so I don't think ignoring is an
acceptable strategy here.

Thanks.

-- 
tejun