This forum is NOT FOR USER questions or problems but DEVELOPER.Most likely busybox init implementation is to blame:
http://www.mail-archive.com/busybox@bus ... 02837.html
Personally I just decided to ignore them
. I think running out of PIDs scenario, althought theoretically possible, is not very likely to happen in practice, as only daemon processes are affected. I tested various services in this environement (mediatomb, vncserver, alsa, apache, sshd and X) but never got more then 30 zombies in total.