panic: sleeping thread wile using USB hard drive

I have been installing FreeBSD 6.2 on IBM XSeries servers some of which
I need to run external USB  drives.

While backing up to a USB hard drive at random times the computer locks
up or reboots with some, but not all of the systems.


The XP3100's work fine and dmesg shows a ntel 82801GB/R ICH7 USB
controller.
The XP3400 shows a GENERIC usb 2.0 chipset and a scan of the PCI bus
shows a slightly differant motherboard chipset (I cant remember what it
was).


I set up my Dell server at home with 2 differant USB/PCI cards each with
a differant chipset and got the same type of errors.


One was NEC and dmesg shows

ohci1: <NEC uPD 9210 USB controller> mem 0xfeb01000-0xfeb01fff irq 24 at
device 14.0 on pci1
usb1: <NEC uPD 9210 USB controller> on ohci1
uhub1: <NEC OHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb1
ohci2: <NEC uPD 9210 USB controller> mem 0xfeb00000-0xfeb00fff irq 23 at
device 14.1 on pci1
usb2: <NEC uPD 9210 USB controller> on ohci2
uhub2: <NEC OHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb2
ehci0: <NEC uPD 720100 USB 2.0 controller> mem 0xfeb02000-0xfeb020ff irq
22 at device 14.2 on pci1
usb3: <NEC uPD 720100 USB 2.0 controller> on ehci0
uhub3: <NEC EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb3


The via shows

ohci0: <OHCI (generic) USB controller> mem 0xfe220000-0xfe220fff irq 5
at device 15.2 on pci0
usb1: <VIA 83C572 USB controller> on uhci0
uhub1: <VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb1
uhci1: <VIA 83C572 USB controller> port 0xccc0-0xccdf irq 23 at device
14.1 on pci1
usb2: <VIA 83C572 USB controller> on uhci1
uhub2: <VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb2
ehci0: <VIA VT6202 USB 2.0 controller> mem 0xfeb00800-0xfeb008ff irq 22
at device 14.2 on pci1
usb3: <VIA VT6202 USB 2.0 controller> on ehci0
uhub3: <VIA EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb3

Both of thease chipsets freeze at ramdom times under FreeBSD 6.2 and
7-CURRENT (as of a few days ago)


The errors on the screen which dont make it to the log are;


sleeping thread (tid 100015, pid 19) owns a non-sleepable-lock
panic: sleeping thread
cpuid=1


and


panic: Trying sleep, but thread marked as sleeping prohimited
cpuid=0
[thread pid 13 tid 100002]
stoped at kbd-enter + ox32: leave db7


The only error in /var/log/messages is

messages.error:Sep 19 19:19:04 mauibuilt savecore: reboot after panic:
sleeping thread

Any help or suggestions would be greatly apriciated, and if anyone knows
of an add in PCI card with yet a differant chipset that does not have
problems, please let me know.


Thanks in advance

Richard Puga
puga_at_mauibuilt.com