linux-kernel - Re: [bug] latest -git boot hang

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Date:	Fri, 10 Oct 2008 14:10:02 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Yinghai Lu <yinghai@...nel.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [bug] latest -git boot hang



On Fri, 10 Oct 2008, Ingo Molnar wrote:
> 
> | 870d6656126add8e383645732b03df2b7ccd4f94 is first bad commit
> | commit 870d6656126add8e383645732b03df2b7ccd4f94
> | Author: Tejun Heo <tj@...nel.org>
> | Date:   Mon Aug 25 19:47:25 2008 +0900
> |
> |     block: implement CONFIG_DEBUG_BLOCK_EXT_DEVT
> 
> and meanwhile 2 other test-systems failed to boot as well - both have 
> CONFIG_DEBUG_BLOCK_EXT_DEVT=y.
> 
> So i guess this debug feature is working as expected.

Ahh, yeah, sounds that way.

> I guess we should mark CONFIG_DEBUG_BLOCK_EXT_DEVT=y as really dangerous 
> to enable because contemporary distributions (i tried Fedora 9) fail 
> with it too?

Tejun - do you know whether _any_ distro will boot with 
CONFIG_DEBUG_BLOCK_EXT_DEVT=y?

It does sound like perhaps the option should be hidden more, if it's 
really only reasonably enabled for some very specialized distro debuggers, 
not normal kernel people.

			Linus
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