/compat/linux/dev/null: Operation not supported.

[Marcin Cieslak]

Why do you have anything in /compat/linux/dev in the first place?

Normally you should have this empty and mapping routines should
send all calls of the Linux devices to the normal devfs /dev
filesystem.

On my system:

saperski% LANG=C ls -l /dev/null
crw-rw-rw-  1 root  wheel    0,  19 Sep  9 10:11 /dev/null
saperski% ls -l /compat/linux/dev/null
ls: /compat/linux/dev/null: No such file or directory

Your are just attempting to write to some device with major
number 2 and minor number 2 and that device probably does not exist..

You must have something very old crap in your /compat/linux/dev.

-- 
               << Marcin Cieslak // saper at system.pl >>