linux-kernel - Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request during shutdown

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Date:	Tue, 15 Oct 2013 08:40:25 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Knut Petersen <Knut_Petersen@...nline.de>,
	Thomas Gleixner <tglx@...utronix.de>, Greg KH <greg@...ah.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request
 during shutdown


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> I've been thinking that CONFIG_DEBUG_LIST could help. Unfortunately it's 
> good to spot list APIs misuse but, if Linus is right, the problem may be 
> that the list belongs to an object that has been freed, and I believe 
> that won't detect such a thing.

Use-after free should be reliably detectable via CONFIG_DEBUG_PAGEALLOC=y.

A couple of years ago I wrote a list debugging beast that would catch 
use-after-free mishaps (sent it to lkml too IIRC), but it was a bit 
complex and I never found the time to nurse it upstream.

Thanks,

	Ingo
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