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Date: Mon, 9 Dec 2002 05:57:40 -0500 (EST)
From: Zwane Mwaikambo <zwane@holomorphy.com>
X-X-Sender: zwane@montezuma.mastecende.com
To: Roy Sigurd Karlsbakk <roy@karlsbakk.net>
cc: Kernel mailing list <linux-kernel@vger.kernel.org>,
       Jens Axboe <axboe@suse.de>
Subject: Re: BUG in 2.5.50
In-Reply-To: <200212091056.08860.roy@karlsbakk.net>
Message-ID: <Pine.LNX.4.50.0212090508390.2139-100000@montezuma.mastecende.com>
References: <200212091056.08860.roy@karlsbakk.net>
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Added Jens to CC to verify any incorrect information i may or may not put
down.

On Mon, 9 Dec 2002, Roy Sigurd Karlsbakk wrote:

> installed 2.5.50 and got an OOPS after a short while. .
> config is attached as tonjeconfig
> /var/log/messages including dmesg and oops is attached as tonje_messages

Perhaps this might help with debugging;

He has CONFIG_BLK_DEV_IDE_TCQ enabled and his IBM supports it,

when he gets to do_rw_disk();

We know its a READ request
	if (rq_data_dir(rq) == READ) {
		if (blk_rq_tagged(rq))
			return hwif->ide_dma_queued_read(drive);

... the request isn't tagged so we drop down here...

		if (drive->using_dma && !hwif->ide_dma_read(drive))
			return ide_started;

int __ide_dma_read (ide_drive_t *drive)
...
	if (HWGROUP(drive)->handler != NULL)
		BUG();

and ->handler = ?

Is this reproducible? If so without CONFIG_PREEMPT?

Cheers,
	Zwane
-- 
function.linuxpower.ca
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