boot error

[jb]

Per olof Ljungmark <peo <at> intersonic.se> writes:

> ... 
> Try a verbose boot.

I forgot to mention:
$ uname -a
FreeBSD localhost.localdomain 9.1-RC1 FreeBSD 9.1-RC1 #0: Tue Aug 14 03:56:40
UTC 2012     root at obrian.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

I set Verbose ON and put hw.usb.ugen.debug="1" in /boot/loader.conf as
originally ugen(4) driver followed the point of lockup.

This time the log sequence was a little different - the ata(4) driver
followed the point of lockup.

If I understand it correctly, these log messages may be recorded in somewhat
random sequence, so the dmesg output sequence in not 100% reliable.
Anyway, here it is:

$ dmesg -a
...
usbus0: 12Mbps Full Speed USB v1.0
usbus1: 12Mbps Full Speed USB v1.0
usbus2: 480Mbps High Speed USB v2.0
usbus3: 12Mbps Full Speed USB v1.0
usbus4: 12Mbps Full Speed USB v1.0
usbus5: 12Mbps Full Speed USB v1.0
usbus6: 480Mbps High Speed USB v2.0
< HERE THE BOOT LOCKUP HAPPENED <=====================================
ata0: reset tp1 mask=03 ostat0=50 ostat1=00
ata0: stat0=0x00 err=0x01 lsb=0x14 msb=0xeb
ata0: stat1=0x00 err=0x00 lsb=0x00 msb=0x00
ata0: reset tp2 stat0=00 stat1=00 devices=0x10000
ugen0.1: <Intel> at usbus0
uhub0: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
ugen1.1: <Intel> at usbus1
uhub1: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus1
ugen2.1: <Intel> at usbus2
uhub2: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus2
ugen3.1: <Intel> at usbus3
uhub3: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus3
ugen4.1: <Intel> at usbus4
uhub4: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus4
ugen5.1: <Intel> at usbus5
uhub5: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus5
ugen6.1: <Intel> at usbus6
uhub6: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus6
ahcich0: AHCI reset...
...

More ideas what to look for or catch ?
jb