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Date:      Tue, 27 Jan 2009 06:51:08 +0100
From:      Oliver Lehmann <lehmann@ans-netz.de>
To:        Markus Hitter <mah@jump-ing.de>
Cc:        freebsd-stable@freebsd.org, freebsd-usb@freebsd.org
Subject:   Re: recently happend kernel panics regarding usb
Message-ID:  <20090127065108.45623019.lehmann@ans-netz.de>
In-Reply-To: <9B0861C2-EF09-4FC4-A8E4-51C654117B98@jump-ing.de>
References:  <1c80fd50-1e5c-4be7-a8dc-3f6f29c4f02a@exchange01.ecp.noc> <9B0861C2-EF09-4FC4-A8E4-51C654117B98@jump-ing.de>

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Markus Hitter wrote:

> 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.

I'm not sure, that this g_vfs_done is related to the panic. I've attached
the drive to an uhci drived port on the same machine, started an fsck and
I've got an immediate panic:

trying to sleep while sleeping is prohibited

If I remember it correctly. The driver has some power saving feature
which shuts the drive down if it is not used for some time and spins it
up when a request arrives. But yesterday I powered the drive up... waited
some secunds and started then a fsck. So I guess it was not in a
"shutdown" state - So I wonder who requested a sleep ;)



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