linux-kernel - Re: system hang on latest git

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Message-ID: <20080129215648.GB28997@lixom.net>
Date:	Tue, 29 Jan 2008 15:56:49 -0600
From:	Olof Johansson <olof@...om.net>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-ia64@...r.kernel.org
Subject: Re: system hang on latest git

On Tue, Jan 29, 2008 at 10:38:52PM +0100, Jens Axboe wrote:
> Please try this.

[...]

> The latter is the problem, but since the queue lock is also held before
> doing the double_spin_lock(), we get into even more trouble. The locking
> hierarchy is fine, it's always queue lock -> io context locks, so the
> above patch should be all that is needed to fix this.
> 
> My initial analysis was wrong, that's all :/

Yep, looks much better now.

Tested-by: Olof Johansson <olof@...om.net>


-Olof
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