topic Re: How can i kill a process! in Operating System - HP-UX

How can i kill a process!

jack_8 — Wed, 28 Feb 2001 02:46:45 GMT

I have a program. I debuged it with gdb. when i quit from gdb, I found the program is still running. I try to kill it with command kill -9 ... . But it is no effect. The program still there. My program didn't catch any signals. I don't know how to kill the program without reboot my machine.
best regards.

Re: How can i kill a process!

Andy Monks — Wed, 28 Feb 2001 03:20:02 GMT

if a process won't respond to kill -9, then it's waiting on an unkillable system call, and there is no way to wake it up (without rebooting).

Re: How can i kill a process!

Karthik_2 — Wed, 28 Feb 2001 05:50:02 GMT

yes I don't think it can be killed or cleared from the process table without a reboot.
If the parent process of this process does not allow this process to die or if the parent process itself is dead .This process will be left in a stale state indefinitely

Re: How can i kill a process!

Jdamian — Wed, 28 Feb 2001 16:37:09 GMT

Hi

You can read the following discussion in the manual pages of "kill" command:

WARNINGS
If a process hangs during some operation (such as I/O) so that it is
never scheduled, it cannot die until it is allowed to run. Thus, such
a process may never go away after the kill. Similarly, defunct
processes (see ps(1)) may have already finished executing, but remain
on the system until their parent reaps them (see wait(2)). Using kill
to send signals to them has no effect.

Good luck !

Re: How can i kill a process!

Mark Vollmers — Wed, 28 Feb 2001 17:15:14 GMT

Hi-

Check to see if the process is just sitting there or if it is using system resources. If it is not using any resources, it shouldn't hurt anything to leave it there until whenever you reboot next (maintenence, etc). I don't think it will interfere with the next time you run the program, either. It kinda depends on when you plan on rebooting next (if you do it regularly or not).

Re: How can i kill a process!

Mike Rightmire — Wed, 28 Feb 2001 17:54:07 GMT

Just one last thought (as I have run into this too.) Be sure after the kill statement to use ps and verify the process ID HAS NOT CHANGED.

If there is a parent process on the machine RE-CREATING the process after each kill, the ID will change.

Sometimes what is actually happening is the process is dying, but the parent simply starts it right back up, giving the illusion the process will not die. Killing the parent process (if applicable) will stop the re-creation of the child process.
Mike

Re: How can i kill a process!

Satish Y — Wed, 28 Feb 2001 18:16:57 GMT

I agree with Mike, you should first try it.

Cheers....
Satish.

Re: How can i kill a process!

Sukumar Alagappan — Sat, 07 Apr 2001 19:52:23 GMT

I had similar experiences and the following article on Technical Knowledge base
keyword search = rcfaxperformance001

gives some information on what you are looking for. Ofcourse only thing that you can do is investigate what this process is doing and try to fix it in your program or try to get a patch for HPUX or for the third party program or library that you are dealing with.