linux-kernel - Re: Linux 2.6.25-rc4

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Date:	Thu, 6 Mar 2008 14:33:47 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Anders Eriksson <aeriksson@...tmail.fm>
Subject: Re: Linux 2.6.25-rc4


* Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:

> The problem looks very similar to the one recently reported by Anders:
> 
> http://lkml.org/lkml/2008/2/22/239
> 
> "Trying out 2.6.25-rc2 smartd always causes my box to hang. I can 
> switch vt:s and the keyboard seems to work.
> 
> Using sysrq-e I noticed a callpath open -> ext3 -> journals -> 
> sync_buffer -> io_scheduel -> generic_unplig_device. I'd guess the 
> open stems from smartd. Removing smartd from the startup, I'm now 
> using rc2 fine..."
> 
> Initially we thought that it is an IDE regression but after some 
> testing and further investigation it seems that IDE changes just made 
> it more likely to occur (yesterday it turned out that the kernel with 
> the "guilty" IDE commit sometimes boots fine).  The issue is easily 
> reproducible.
> 
> PS We've already verified that it is not PREEMPT related or a compiler 
> bug.

smartd is not active here though - and starting/restarting it doesnt 
provoke a hang.

	Ingo
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