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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Sun, 9 Aug 2009 18:40:53 +0200
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Subject: Re: Performance issues
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On Sunday 09 August 2009 18:23:41 M. Warner Losh wrote:
> Any ideas how to track this down?

Hi,

USB is only draining from "usbd_transfer_drain()" in 
/sys/dev/usb/usb_transfer.c . You could add a print including the backtrace 
and see if that function gets called when it freezes.

Else I would try to compile a fresh kernel from USB P4. There are some patches 
there in relation to the recent newbus lock change, that might help.

USB uses uppercase "WDRAIN". Is your printout lowercase "wdrain" ?

--HPS