Bug#518846: User not found?

[Eugen Dedu]

Maybe it's related: I have some processes with ID without user name!
snoopy:~$ ps aux|grep ^[^a-z]
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
104       3002  0.1  0.0  21576  1108 ?        Ss   09:22   0:36 
/usr/bin/dbus-daemon --system
100       3362  0.0  0.0  47952   524 ?        Ss   09:22   0:00 
/usr/sbin/exim4 -bd -q30m
107       3415  0.1  0.1  36428  2208 ?        Ss   09:22   0:21 
/usr/sbin/hald
107       3576  0.0  0.0  32216   968 ?        S    09:22   0:00 
hald-addon-acpi: listening on acpid socket /var/run/acpid.socket
103       4049  0.0  0.0  14296   652 ?        S<s  09:23   0:00 
avahi-autoipd: [eth0] bound 169.254.8.166
snoopy:~$

Is it normal??
-- 
Eugen