linux-kernel - Re: [BUG] Potential deadlock in the block layer

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Message-ID: <e2c68940-17d3-d5ca-6385-a79cea238b0a@kernel.dk>
Date:   Thu, 16 Feb 2017 07:56:12 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, linux-block@...r.kernel.org,
        Gabriel C <nix.or.die@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [BUG] Potential deadlock in the block layer

On 02/16/2017 07:35 AM, Thomas Gleixner wrote:
> On Mon, 13 Feb 2017, Jens Axboe wrote:
> 
>> On 02/13/2017 07:14 AM, Thomas Gleixner wrote:
>>> Gabriel reported the lockdep splat below while investigating something
>>> different.
>>>
>>> Explanation for the splat is in the function comment above
>>> del_timer_sync().
>>>
>>> I can reproduce it as well and it's clearly broken.
>>
>> Agree, the disable logic is broken. The below isn't super pretty, but it
>> should do the trick for 4.10.
> 
> Cures the splat. Is that a new 4.10 'feature'? That wbt stuff has been
> merged a few releases ago.

OK good, I'll get this submitted for 4.10. wbt is a new feature in
this release.

-- 
Jens Axboe