The following reply was made to PR usb/145513; it has been noted by GNATS.

From: Mikle Krutov <nekoexmach...@gmail.com>
To: Hans Petter Selasky <hsela...@c2i.net>
Cc: freebsd-usb@freebsd.org, freebsd-gnats-sub...@freebsd.org
Subject: Re: usb/145513: New USB stack: no new devices after forced usb
 flash detach
Date: Sun, 11 Apr 2010 03:03:09 +0400

 On Thu, Apr 08, 2010 at 07:29:43PM +0200, Hans Petter Selasky wrote:
 > On Thursday 08 April 2010 19:14:03 Mikle Krutov wrote:
 > > On Thu, Apr 08, 2010 at 01:52:50PM +0200, Hans Petter Selasky wrote:
 > > > Hi,
 > > >
 > > > That's because the UMASS detach is hanging, most likely.
 > > >
 > > > Try to break into the kernel and get a backtrace.
 > > >
 > > > --HPS
 > > 
 > > Hi,
 > > I unfortunately could not find any info about how do i do this. Could
 > > you provide me some link?
 > > 
 > 
 > Add:
 > 
 > options         KDB                     # Enable kernel debugger support.
 > options         DDB                     # Support DDB.
 > options         GDB                     # Support remote GDB.
 > 
 > When it hangs, enter this from the console:
 > 
 > sysctl debug.kdb.panic=1
 > 
 > Type
 > 
 > alltrace
 > 
 > bt
 > 
 > bt all
 > 
 > or something similar.
 > 
 > Type "continue" when you are finished.
 > 
 > You can also use CTRL+ALT+ESC key combination.
 > 
 > --HPS
 Sorry for no-response for such a long time, that was because after the
 kernel-update (i've fetched the latest sources before rebuilding with
 debug support) i could not reproduce that bug. Before kernel-update it
 has happened not every time, so i wanted to see what happends for a
 couple of days.
 
 -- 
 Wbr,
 Krutov Mikle
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