RE: <defunct> process in AIX

the 'C' program is "respawned" in inittab thru crontab.... the <defunct> appears many times in ps-eaf but gets cleaned up soon... not this time though...

according to all you posts, i have concluded that the program needs modification,
i have asked the vendor to take a look.... will let you know the results.

Regards

Rahul

> ----------
> From: Brian D. Silverio[SMTP:bsilverio_at_necc.mass.edu ]
> Reply To: ORACLE-L_at_fatcity.com
> Sent: Wednesday, January 10, 2001 11:06 PM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: <defunct> process in AIX
>
> A defunct or zombie process has already ended. There is no way to
> send it a signal to clean it up.
>
> Signals (kill -9 included) are only acted on when a process either
> exits from executing its time slice or is about to get another CPU
> time slice. Since a zombie is no longer a candidate for execution
> it will never "see" the signal.
>
> The problem is usually caused by a parent process that is not coded
> properly. Zombies are removed by a program executing the "wait" system
> routine. If the parent process has ended, then the children are
> inherited by init and cleaned up. This is called "reaping" and init is
> the grim reaper.
>
> If the parent process has ended then it is a bug with the OS. AIX had
> this problem five years ago. Perhaps it was not fixed properly.
>
> Brian
>
> > -----Original Message-----
> > From: root_at_fatcity.com [mailto:root_at_fatcity.com]On Behalf Of Rahul
> > Sent: Wednesday, January 10, 2001 5:06 AM
> > To: Multiple recipients of list ORACLE-L
> > Subject: <defunct> process in AIX
> >
> >
> > List,
> > we are running oracle 816 on AIX H70, we use the tty port to communicate
>
> > with a telephone switch, program written in 'C' reads from Oracle and
> > writes the command to the '/dev/tty1' .
> >
> > the problem is that sometimes the port hangs and we find a zombie
> <defuct>
> > process hanging in memory...... it does not allow to drop and recreate
> the
> > port also..
> > says... "specified device is busy..."
> >
> > is there any way to clear the <defunct> process ? and/or drop/recreate
> the
> > TTY port ??
> >
> > previously we used to re-boot the machine, but this is not an option
> now..
> >
> > Regards
> >
> > Rahul
> >
> >
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.com
> > --
> > Author: Rahul
> > INET: rahul_at_ratelindo.co.id
> >
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> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Brian D. Silverio
> INET: bsilverio_at_necc.mass.edu
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
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Received on Wed Jan 10 2001 - 21:33:54 CST