Date: Tue, 15 Oct 2013 08:40:25 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Knut Petersen <Knut_Petersen@t-online.de>,
        Thomas Gleixner <tglx@linutronix.de>, Greg KH <greg@kroah.com>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [BUG 3.12.rc4] Oops: unable to handle kernel paging request
 during shutdown
Message-ID: <20131015064025.GA22672@gmail.com>
References: <525BD08C.2080101@t-online.de>
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* Frederic Weisbecker <fweisbec@gmail.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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