zombie processes waiting for a lock, smth to worry about?

[Stefan Krüger <skrueger@xxxxxxxxxxxxxxxx>]

hi folks,

sometimes sysctl or fstat just stop and end up as a zombie process

% ps
  PID  TT  STAT      TIME COMMAND
   81 #C1  SL     0:00.04 _su -m (csh)
40884 #C1  IWL    0:00.00 sysctl
41510 #C1  DWL    0:00.00 sh -c /usr/bin/fstat > /dev/null 2>&1
41513 #C1  ZL     0:00.00 /usr/bin/fstat
53544 #C1  IWL    0:00.00 sysctl
53549 #C1  IWL    0:00.00 sysctl
53647 #C1  DL     0:00.01 sh -c /usr/bin/fstat > /dev/null 2>&1
53648 #C1  ZL     0:00.00 /usr/bin/fstat
53651 #C1  DL     0:00.02 sh -c /usr/bin/fstat > /dev/null 2>&1
53654 #C1  ZL     0:00.00 /usr/bin/fstat
57387 #C1  R1L+   0:00.01 ps

I can't kill them, even with kill -9

so my question is, ignore them or is smth broken?