linux-kernel - Re: dio_get_page() lockdep complaints

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Message-ID: <20070419125236.GF11780@kernel.dk>
Date:	Thu, 19 Apr 2007 14:52:36 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	"Vladimir V. Saveliev" <vs@...esys.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-aio@...ck.org,
	reiserfs-dev@...esys.com, linux-mm@...ck.org
Subject: Re: dio_get_page() lockdep complaints

On Thu, Apr 19 2007, Jens Axboe wrote:
> > I tried fio (1.15) with this job file and did not get the possible
> > circular locking dependency detected
> 
> Perhaps some of the preempt settings? The box is an emc centera, it's a
> lowly p4/ht.

As I mentioned, the rootfs is on reiser. So something in the boot up
scripts may trigger something that gets reiser to run through that path
with the wrong locking order. After the box is done booting, the dmesg
is clean. I then mount the ext3 fs and run the fio test, the lockdep
trace shows up immediately.

The distro is SLES9.

-- 
Jens Axboe

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