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

From: Hans Petter Selasky <hsela...@c2i.net>
To: freebsd-usb@freebsd.org
Cc: Krutov Mikle <nekoexmach...@gmail.com>,
 freebsd-gnats-sub...@freebsd.org
Subject: Re: usb/145513: New USB stack: no new devices after forced usb flash 
detach
Date: Thu, 8 Apr 2010 13:52:50 +0200

 On Thursday 08 April 2010 12:55:44 Krutov Mikle wrote:
 > >Number:         145513
 > >Category:       usb
 > >Synopsis:       New USB stack: no new devices after forced usb flash
 > > detach Confidential:   no
 > >Severity:       serious
 > >Priority:       low
 > >Responsible:    freebsd-usb
 > >State:          open
 > >Quarter:
 > >Keywords:
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Thu Apr 08 11:00:15 UTC 2010
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Krutov Mikle
 > >Release:        8.0-STABLE
 > >Organization:
 > >Environment:
 > 
 > FreeBSD takino.homeftp.org 8.0-STABLE FreeBSD 8.0-STABLE #0: Mon Mar  8
 >  06:25:34 MSK 2010     r...@takino.homeftp.org:/usr/obj/usr/src/sys/TAKINO 
 >  amd64
 > 
 > >Description:
 > 
 > After detaching the mounted usb-flash device, no new usb-devices are
 >  detected. USB controller is     "device     = 'SB700 USB OHCI1 Controller"
 > 
 > >How-To-Repeat:
 > 
 > 1) attach (vfat-formated, did not test with other fs) flash device, mount
 >  it 2) detach without umounting
 > 3) try to attach another usb-device
 > 4) see no new devices, no dmesg messages, nothing
 > 
 
 Hi,
 
 That's because the UMASS detach is hanging, most likely.
 
 Try to break into the kernel and get a backtrace.
 
 --HPS
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