The following reply was made to PR usb/171262; it has been noted by GNATS.

From: Hans Petter Selasky <hsela...@c2i.net>
To: freebsd-usb@freebsd.org
Cc: Waitman Gobble <uzi...@da3m0n8t3r.com>,
 freebsd-gnats-sub...@freebsd.org
Subject: Re: usb/171262: plug in sdhc via usb reader reboots machine
Date: Mon, 3 Sep 2012 17:27:59 +0200

 On Sunday 02 September 2012 23:03:52 Waitman Gobble wrote:
 > >Number:         171262
 > >Category:       usb
 > >Synopsis:       plug in sdhc via usb reader reboots machine
 > >Confidential:   no
 > >Severity:       non-critical
 > >Priority:       low
 > >Responsible:    freebsd-usb
 > >State:          open
 > >Quarter:
 > >Keywords:
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Sun Sep 02 21:10:11 UTC 2012
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Waitman Gobble
 > >Release:        FreeBSD 9.1-RC1
 > 
 > >Organization:
 > Waitman Gobble
 > 
 > >Environment:
 > FreeBSD kamira.waitman.net 9.1-RC1 FreeBSD 9.1-RC1 #0: Tue Aug 14 04:25:06
 > UTC 2012     r...@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC 
 > amd64
 > 
 > >Description:
 > was dumping sdhc cards to ntfs-3g mounted usb drive (8 cards successfully,
 > then inserting 9th card rebooted machine)
 > 
 > this in logs 45 times:
 > 
 > Sep  3 04:36:59 kamira kernel: (da1:umass-sim1:1:0:0): SCSI sense: HARDWARE
 > FAILURE asc:4b,0 (Data phase error)
 > 
 > (then machine reboot.)
 > 
 > full log starting from insert:
 > 
 > 
  
 > >How-To-Repeat:
 > reader in usb port with sdhc card seems to work 'most of the time' but for
 > some reason caused machine reboot in one instance. thank you.
 > 
 
 Hi,
 
 If you add the kernel debugging options to your GENERIC file, then you will 
 get a backtrace next time it crashes.
 
 There is also a script under:
 /usr/src/tools/regression/usb/
 
 Which you can use to forcedly re-enumerate your USB card-reader. Try that when 
 a card is inserted with NTFS and see what happens.
 
 --HPS
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