This is some addendum to my send-pr.

1. I forgot to mention that panic() was occured under heavy load.  
   While repeating 80Mbyte with ftp with my testing machine, panic()
   was occured within 10th transfer.

2. Patch may not complete: 

>	It crashes at fxp_add_rfabuf(), and the same crash happens on
>	FreeBSD 2.2.8 (same code base fxp driver) on the same machine.
   My coworker at remote office try with the same machine which
   installed FreeBSD 2.2.8(stable).  He apply the corresponding fix
   which issue FXP_SCB_COMMAND_RU_ABORT, but panic() was occured under
   his heavy load.  So, attached my patch may restrain panic() but is
   dosen't solve the problem comletely.  :-(

--
Takahiro Kambe <taca@sky.yamashina.kyoto.jp>