linux-kernel - Re: [Bug #11035] System hangs on 2.6.26-rc8

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Date:	Sat, 19 Jul 2008 00:25:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Roman Mindalev <lists@...0n.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Bug #11035] System hangs on 2.6.26-rc8


* Vegard Nossum <vegard.nossum@...il.com> wrote:

> BTW, I didn't consider that argument (of continuing as far as 
> possible) before, but it's a good one; if we don't crash completely, 
> the user can still copy the log we have a better report of it. I guess 
> kerneloops.org is currently missing out a great deal of reports which 
> all shut down the machine immediately without a chance to go into the 
> log.

yes. There are two techniques to improve the 'yield' of kerneloops.org: 
1) make a better job of getting the logs off the box 2) make a better 
job of not crashing the box when we can do better.

For example lockdep tries very hard to never crash the box. It is a 
feature that warns about a chance of a lockup, not about a lockup itself 
- so crashing the box at the point of the bug detection is 
counter-productive.

The same applies to DEBUG_PAGEALLOC as well: technically nobody (but the 
buggy code itself) is hurt by accessing already freed data. So we could 
try and let it run.

(Btw., this might be a way to share a mechanism between kmemcheck and 
DEBUG_PAGEALLOC, and make kmemcheck more useful to the general kernel as 
a whole.)

	Ingo
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