linux-kernel - Re: 3.14.0+/x86: lockdep and mutexes not getting along

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Message-ID: <3615.1397224782@turing-police.cc.vt.edu>
Date:	Fri, 11 Apr 2014 09:59:42 -0400
From:	Valdis.Kletnieks@...edu
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jason Low <jason.low2@...com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	"Michael L. Semon" <mlsemon35@...il.com>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: 3.14.0+/x86: lockdep and mutexes not getting along

On Thu, 10 Apr 2014 16:15:59 +0200, Peter Zijlstra said:
> On Thu, Apr 10, 2014 at 11:18:24AM +0200, Peter Zijlstra wrote:
> > So I managed to reproduce, and the below makes it go away. I just don't
> > understand why though. will stare more.
>
> /me kicks himself.. bloody obvious fail there :-)
>
> Not unlocking the lock after a lockdep trigger will make things get
> stuck real fast :-)
>
> ---
>  kernel/locking/mutex-debug.c | 19 +++++++++----------
>  1 file changed, 9 insertions(+), 10 deletions(-)

Confirming that this makes next-20140409 boot without hanging for me.
Feel free to stick a Tested-by: on it. ;)

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