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

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Message-ID: <20081010205642.GA28840@elte.hu>
Date:	Fri, 10 Oct 2008 22:56:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
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


> bisection ongoing. [...]

the result is:

 # bad:  [f6bccf69] Merge git://git.kernel.org/pub/scm/linux/kernel/gi
 # good: [3fa8749e] Linux 2.6.27
 # good: [d403a648] Merge phase #1 of git://git.kernel.org/pub/scm/lin
 # bad:  [ad3316bf] block: Find bio sector offset given idx and offset
 # bad:  [10865dfa] sg: convert the non-data path to use the block lay
 # good: [88e34126] block: update add_partition() error handling
 # bad:  [4c46501d] block: move holder_dir from disk to part0
 # good: [f615b48c] sd/ide-disk: apply extended minors to sd and ide
 # bad:  [80795aef] block: move capacity from disk to part0
 # bad:  [ed9e1982] block: implement and use {disk|part}_to_dev()
 # bad:  [870d6656] block: implement CONFIG_DEBUG_BLOCK_EXT_DEVT

| 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.

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?

	Ingo
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