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

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Message-ID: <alpine.DEB.2.20.1702161533280.3543@nanos>
Date:   Thu, 16 Feb 2017 15:35:20 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jens Axboe <axboe@...nel.dk>
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 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.

Thanks,

	tglx