linux-kernel - Re: tty_ldisc_try_get(): BUG kmalloc-8: Poison overwritten

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Message-ID: <84144f020906140132s56b5616flf61040553d88c05b@mail.gmail.com>
Date:	Sun, 14 Jun 2009 11:32:22 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	Vegard Nossum <vegard.nossum@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: tty_ldisc_try_get(): BUG kmalloc-8: Poison overwritten

On Sun, Jun 14, 2009 at 11:20 AM, Pekka Enberg<penberg@...helsinki.fi> wrote:
>> You could add something like
>>
>>  WARN_ON(ld->refcount == 0x6b)
>>
>> to tty_ldisc_deref() to see if that triggers.

On Sun, Jun 14, 2009 at 11:30 AM, Pekka Enberg<penberg@...helsinki.fi> wrote:
> Make that
>
>    WARN_ON(ld->refcount == (int)0xa56b6b6b)
>
> instead.

And oh, kmemcheck should be able to catch this too. :-)
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