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

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Date:	Sat, 11 Oct 2008 09:50:19 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>, 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>
Subject: Re: [bug] latest -git boot hang

Hello,

Linus Torvalds wrote:
> 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?

Hmmm... openSUSE 11.0 didn't have any problem with it, which I was a bit
pleasantly surprised about.  I haven't tested management tools but the
base system worked just fine.

> 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.

Yeap, if fedora didn't work, I think it should be hidden.  Do we already
have place to hide things like this?

Thanks.

-- 
tejun
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