User's cron job creates zombie process on 5.3

[Rob]

Peter Jeremy wrote:
> On Wed, 2005-Jan-19 09:16:59 +0900, Rob Lahaye wrote:
> 
>> tunnel="-L 55110:localhost:110 pop3.univ.net"
>> tunnel_up=`pgrep -f -- "${tunnel}"`
>> [ "${tunnel_up}" = "" ] && /usr/bin/ssh -N -f ${tunnel}
> 
> 
>>It works beautifully, but why does this also generate one zombie process:
>>USER  PID %CPU %MEM   VSZ  RSS  TT  STAT STARTED      TIME COMMAND
>>rob   655  0.0  0.0     0    0  ??  Z    Sat02PM   0:00.01 <defunct>
>
> You get a zombie when a process has exited and the parent hasn't issued
> a wait(2) (or SIG_IGN'd SIGCHLD).  Have a look at what the parent process
> is and that might give you an idea as to what is going wrong.

Sorry, can you tell me how to do this?
How can I find out what's the parent process of a Zombie process?
I have a user crontab, which calls a sh-shell script; so I have no
clue where to start investigating....

Thanks,
Rob.