System hangs with vnode backed md(4) devices -- still a problem?

Toward the end of last year, through to earlier this year, -current had  
a problem with vnode backed md(4) devices.  Specifically,

     truncate -s 6G foo.md
     mdconfig -a -t vnode -f foo.md -u 0
     newfs /dev/md0
     mount /dev/md0 /mnt
     rsync /large/amount/of/data /mnt

would cause the rsync process to eventually get stuck in a wdrain  
state, and other processes in the system would gradually hang --  
processes were still running, but doing anything that might need to  
read from a buffer caused the process to hang.  Eventually, everything  
would be hung.

If I'm reading the mailing lists right, this was supposed to be solved  
here:

      
http://lists.freebsd.org/pipermail/freebsd-current/2003-November/ 
013183.html

However, I'm still seeing the problem in -current from Jan 14th.  So  
I'm wondering if anyone else is seeing it, and if not, a rough idea of  
when it was fixed.  I'm trying to avoid the pain of updating to a very  
recent current (nVidia issues, having to spend days rebuilding ports)  
if the problem still exists.

Cheers,

N