freebsd stable - Jan 2009 - recently happend kernel panics regarding usb

Hi,

I'm experiencing recently happend kernel panics while making bacula
backups on my external USB harddisk. It first happened some days ago
while I was running 6.4-PRERLEASE. I then updated to 6.4-STABLE and
enabled all the kernel debugging stuff.

I've uploaded "screenshots" (including backtrace) here:

http://pics.pofo.de/gallery/v/misc/

I'm now not sure if the external USB-case, the PATA harddisk or the USB
controler is dying - or if it is a FreeBSD problem. The USB case which I
had before died after 1.5 years of usage without any notice from one day
to another... maybe this one here is now dying too but with some noise?

-- 
 Oliver Lehmann
  http://www.pofo.de/
  http://wishlist.ans-netz.de/

Am 25.01.2009 um 11:12 schrieb Oliver Lehmann:
> I'm experiencing recently happend kernel panics while making bacula
> backups on my external USB harddisk. It first happened some days ago
> while I was running 6.4-PRERLEASE. I then updated to 6.4-STABLE and
> enabled all the kernel debugging stuff.
Looking at your screenshots, I'm getting plenty of these g_vfs_done()  
= 5 errors with an ordinary pen drive on various stages of stable/7  
as well. The pen drive works flawlessly on other computers. Same for  
another pen drive I tried for verification.

If you throw the EHCI driver out of the kernel your drive will use  
either OHCI or UHCI (both are slow). This seems to help, at least for  
the limited things I use this pen drive now.

The good thing is, you obviously had a FreeBSD installation which  
worked fine with USB 2.0 drives. This would be a good starting point  
for the search of a fix. Any chance you can get back to that state?

If the panics appeared without any change on the system, could you  
stress test this drive a little on another computer?


MarKus

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Dipl. Ing. Markus Hitter
http://www.jump-ing.de/