If you get the following error in your linux-vserver guest after upgrading it to lenny:
Feb 21 14:03:22 ftp sshd[18392]: error writing /proc/self/oom_adj: Permission denied
Adjust /etc/default/ssh ‘s SSHD_OOM_ADJUST=-17 into SSHD_OOM_ADJUST= then restart ssh to get rid of it.