linux-kernel - Re: [PATCH] module: fix reference to mod->percpu after freeing module.

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Message-ID: <4C038E90.3020008@gmail.com>
Date:	Mon, 31 May 2010 12:25:20 +0200
From:	Tejun Heo <htejun@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Brandon Philips <brandon@...p.org>,
	Jon Masters <jonathan@...masters.org>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH] module: fix reference to mod->percpu after freeing module.

On 05/31/2010 12:23 PM, Rusty Russell wrote:
> Rafael sees a sometimes crash at precpu_modfree from kernel/module.c; it
> only occurred with another (since-reverted) patch, but that patch simply
> changed timing to uncover this bug, it was otherwise unrelated.
> 
> The comment about the mod being freed is self-explanatory, but neither
> Tejun nor I read it.  This bug was introduced in 259354deaa, after it
> had previously been fixed in 6e2b75740b.  How embarrassing.
> 
> Reported-by: "Rafael J. Wysocki" <rjw@...k.pl>
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Masami Hiramatsu <mhiramat@...hat.com>
> Tested-by: "Rafael J. Wysocki" <rjw@...k.pl>

Embarrassingly-Acked-by: Tejun Heo <tj@...nel.org>

Thanks. :-)

-- 
tejun
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