linux-kernel - Re: oops in __nodemgr_remove_host_dev (was Re: Ooops with suspend to RAM)

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Date:	Thu, 15 Mar 2007 01:08:43 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Adrian Bunk <bunk@...sta.de>
CC:	Ismail Dönmez <ismail@...dus.org.tr>,
	linux-kernel@...r.kernel.org,
	linux1394-devel@...ts.sourceforge.net, Greg KH <greg@...ah.com>
Subject: Re: oops in __nodemgr_remove_host_dev (was Re: Ooops with suspend
 to RAM)

Ismail Dönmez wrote:
> On Wednesday 14 March 2007 20:25:24 Stefan Richter wrote:
>> Ismail Dönmez wrote:
>> > Are you able to rmmod it?
>>
>> Yes, but on 2.6.20 and earlier kernels, most of the time with
>> development versions of the 1394 drivers. I still haven't tried
>> 2.6.21-rc, will hopefully get to it tonight.
> 
> Ok then that explains a bit, without suspend if I rmmod ohci1394 module I got 
> the exact oops.

Elsewhere, Adrian Bunk wrote:
| Is this an old problem, or what was the last kernel that worked
| for you?

Adrian,

according to a quick test I made right now it is a regression post 2.6.20.
# modprobe ohci1394   # wait a bit, eth1394 is auto-loaded
# modprobe -r eth1394
# modprobe -r ohci1394
works.
# modprobe ohci1394   # wait a bit, eth1394 is auto-loaded
# modprobe -r ohci1394
oopses with the same trace as Ismael posted. And indeed, looking at his
trace once more I now also spot eth1394 among his linked-in modules.

Ismail, if you have the opportunity, the next thing you could test would
be to unload eth1394 explicitly before ohci1394 on 2.6.21-rc3. This
would _not_ oops according to my observation.

Thanks to Ismail's link to the similar report on 2.6.19-rc5-mm2 we
already have a hot candidate to be the trigger (not necessarily to be
the actual bug):
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=43cb76d91ee85f579a69d42bc8efc08bac560278
"Network: convert network devices to use struct device instead of
class_device"

Alas I didn't remember that older 2.6.19-rc5-mm2 discussion when I saw
Greg's pull request with this conversion patch (February 7) and didn't
react and test Linus' newest.

Advice would be appreciated...
-- 
Stefan Richter
-=====-=-=== --== -====
http://arcgraph.de/sr/
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