Zombies y <defunct>

[Larry Letelier N.]

Hola Gente:

Vengo a acusar a dovecot-auth, nos esta dando demaziados proceso Zombies

[root en maquina ~]# ps -el |grep Z
F S   UID   PID  PPID  C PRI  NI ADDR SZ WCHAN  TTY          TIME CMD
4 Z    97 32414 12911  0  75   0 -     0 exit   ?        00:00:00 imap-login
<defunct>
5 Z     0 32426 12914  0  77   0 -     0 exit   ?        00:00:00
dovecot-auth <defunct>

top - 15:31:25 up 1 day,  2:48,  3 users,  load average: 7.90, 7.72, 6.73
Tasks: 1423 total,   7 running, 1412 sleeping,   0 stopped,   4 zombie
Cpu(s): 40.1% us,  9.1% sy,  0.0% ni,  0.0% id, 50.5% wa,  0.3% hi,  0.0% si
Mem:   2043572k total,  1388116k used,   655456k free,    56080k buffers
Swap:  4610644k total,      160k used,  4610484k free,   550024k cached


alguna sugerencia?