linux-kernel - Re: Bug: "bad unlock balance detected" 2.6.27-rc3-next-20080820

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Date:	Thu, 21 Aug 2008 10:19:49 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"jay kumar" <jaykumarks@...il.com>
Cc:	"David Howells" <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org, linux-next@...r.kernel.org
Subject: Re: Bug: "bad unlock balance detected" 2.6.27-rc3-next-20080820

On Thu, Aug 21, 2008 at 10:10 AM, Vegard Nossum <vegard.nossum@...il.com> wrote:
> On Thu, Aug 21, 2008 at 9:04 AM, jay kumar <jaykumarks@...il.com> wrote:
>> While testing 2.6.27-rc3-next-20080820 ,  i observed this    "BUG:bad
>> unlock balance detected" during boot time
>>
> Thanks for the report. The error comes from
>
> commit d9a939fb80ef390b78b3c801f668bd1e35ebc970
> Author: David Howells <dhowells@...hat.com>
> Date:   Thu Aug 7 20:02:20 2008 +1000
>
>    CRED: Make execve() take advantage of copy-on-write credentials
>
> (Added to Cc. I guess it's also nice to Cc linux-next on errors in -next code.)
>
> I couldn't reproduce your original failure, but I've attempted to fix
> it by reordering the mutex unlock and bprm free and removing the
> extraneous unlock (see attached patch; it boots for me without
> errors).

Actually, I was able to reproduce the original issue after all. And
the patch fixed it for me. Please review :-)


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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