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

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Message-ID: <20090614115428.1127ed2d@lxorguk.ukuu.org.uk>
Date:	Sun, 14 Jun 2009 11:54:28 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	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, 14 Jun 2009 10:10:52 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> Ok, this is one for those who like to look at weird crashes/bugs.
> 
> Here's a new regression that popped up in this merge window, there's 
> some sort of slab corruption going on in tty data structures:

I split the ldisc and tty apart and redid the ldisc locking so its a fair
bet I know what changeset is to blame, will just need to hunt it down a
bit. kmemcheck found one leak case on Friday which I've fixed but not yet
scribbles.

>  c65c9bc: tty: rewrite the ldisc locking

Almost certainly that one and will investigate on Monday

Alan
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