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Date: Sat, 21 Mar 2009 21:16:54 -0600 (MDT)
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To: pluknet@gmail.com
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: mav@freebsd.org, freebsd-current@freebsd.org
Subject: Re: Unable to set devclass (devname: (null)
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In message: <a31046fc0903091504h24626240p3bb46401fedb37a@mail.gmail.com>
            pluknet <pluknet@gmail.com> writes:
: 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).

Looks like something to do with atakbd or psm.  What does your hints
file look like?

Warner