linux-kernel - Re: [bug] sata detection problem

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Date:	Sun, 8 Feb 2009 13:30:01 +0100
From:	Maciej Rutecki <maciej.rutecki@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Tejun Heo <tj@...nel.org>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [bug] sata detection problem

2009/2/8 Ingo Molnar <mingo@...e.hu>:

[...]

> Look at the weird sda detection. The only _real_ device on this system is the
> ST3320620AS disk which got detected as sdb. But the bogus sda entry crashed the
> (older) OS installation on the box:
>
> [   20.132252] VFS: Cannot open root device "sda3" or unknown-block(0,0)
>
> Find below a successful bootup. Bug is very sporadic. (seems timing related)
>

I had similar problem few months ago, while laptop hangs during DVD
drive detection. Problem occurs very often when CONFIG_HZ_1000 is set,
but never when CONFIG_HZ=300 is set. I reported this, but I hadn't any
response. Also I think, that is timming issue.

http://kerneltrap.org/mailarchive/linux-kernel/2008/8/11/2898134

-- 
Maciej Rutecki
http://www.maciek.unixy.pl
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