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mount hang attempting to mount a umass device

My mount and shell (ksh in an xterm) hang when doing a mount of a 
USB-based flash disk device. For example:

umass0 at uhub4 port 5 configuration 1 interface 0
umass0: vendor 0x10d6 USB 2.0(HS) Flash Disk, rev 2.00/1.00, addr 2
umass0: using ATAPI over Bulk-Only
atapibus1 at umass0: 2 targets
cd1 at atapibus1 drive 0: <GPX, , 1.00> cdrom removable

This is a GPX Digital Audio Player ML648B.

new-host$ sudo mount /dev/cd1d /mnt
mount: cannot open `/dev/cd1d': Operation not supported by device
new-host$ sudo mount /dev/cd1a /mnt 


mount is running, but no file system is mounted.

root  3764  0.0  0.1   1080    568 ttyp7  D+   Sat09AM   0:00.00 mount 
/dev/cd1a /mnt 
reed 20589  0.0  0.1   2824   1092 ttyp7  Is   Thu03PM   0:00.02 ksh 
reed  1759  0.0  0.3   5508   3508 ?      S    Thu03PM   0:05.96 

As you can see the mount has been hanging for a couple days. Even after 
unplugging the USB device, and multiple SIGKILL attempts, no change.

My kernel is:

NetBSD new-host 5.0.0_PATCH NetBSD 5.0.0_PATCH (GENERIC) #0: Wed Jul 15 
12:42:22 UTC 2009

This happens with a different physical device too.

Any ideas on how to kill this?

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