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Date: Tue, 10 Mar 2009 00:14:13 +0200
From: Alexander Motin <mav@FreeBSD.org>
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To: pluknet <pluknet@gmail.com>
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Cc: FreeBSD-Current <freebsd-current@freebsd.org>
Subject: Re: Unable to set devclass (devname: (null)
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pluknet wrote:
> 2009/3/10 Alexander Motin <mav@freebsd.org>:
>> pluknet wrote:
>>> Is it ok (and how much harmfull) to see this message?
>>>
>>> driver bug: Unable to set devclass (devname: (null))
>>>
>>> P.S.
>>> This is introduced in subr_bus.c, v1.216
>>> -                                       PDEBUG(("Unable to set device
>>> class"));
>>> +                                       printf("driver bug: Unable to set
>>> devclass (devname: %s)\n",
>>> +                                           (child ?
>>> device_get_name(child) :
>>> +                                               "no device"));
>>>
>>> where PDEBUG was moved from BUS_DEBUG to general output.
>> Actually this check was introduced in rev. 1.214, just was not logged.
>> Before this change system could crash soon after this message. Now it should
>> not, but related device probably will not work properly. It is probably not
>> good and should be fixed, but it can be just a low memory symptom. It was
>> noticed for ata driver, but I hope it was fixed. Where have you get it?
> 
> This is during the boot, see dmesg (attached).

It does not gives much info. Can you try to add dl->driver->name, 
device_get_unit(child) and device_set_devclass() result printing there?

-- 
Alexander Motin