Comment 7 for bug 400484

Using git://kernel.ubuntu.com/ubuntu/ubuntu-karmic.git, both with and without
CONFIG_USER_NS, it works for me:

[hallyn@linuz11 ~]$ keyctl add user mykey stuff @u
351981811
[hallyn@linuz11 ~]$ keyctl show
Session Keyring
       -3 --alswrv 501 501 keyring: _ses
456819210 --alswrv 501 -1 \_ keyring: _uid.501
351981811 --alswrv 501 501 \_ user: mykey
[hallyn@linuz11 ~]$ keyctl list @u
1 key in keyring:
351981811: --alswrv 501 501 user: mykey

Dustin, can you post your .config?