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Promit
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Joined: 15 Nov 2003
Posts: 344
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 Posted: Tue Dec 23, 2003 12:40 am Post subject: How do you kill a process *no matter what* ? |
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How can you absolutely force a process kill, regardless of its status (zombied, orphaned, etc.) or what it's doing? I want a process DEAD and I don't care what goes down with it...
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Windows, Linux, whatever. |
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xoomix
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Joined: 02 Jan 2003
Posts: 489
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| Posted: Tue Dec 23, 2003 12:44 am Post subject: Reboot |
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| sadly, even in Linux processes can become completely unresponsive and only changing runlevels or rebooting will clear it. Kill -9 is your best bet -- if that doesn't work, telinit to a lower runlevel than you are at and then telinit back up, or reboot. |
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xoomix
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Joined: 02 Jan 2003
Posts: 489
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| Posted: Tue Dec 23, 2003 12:47 am Post subject: Oh yeah -- |
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| Zombie processes you might have more luck with -- zombied processes are just proceses that have had their parent processes terminated prematurely. If you can find out what the parent process was and restart it, you may be able to get it to kill the child or zombie process by stopping the parent correctly. |
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Flolp
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Joined: 02 Jul 2003
Posts: 26
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| Posted: Tue Mar 16, 2004 11:03 am Post subject: |
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Hmmm I experienced that I get rid of processes like this if I kill their parents, for example my X Server. Sideeffect: All my processes running in graphical terminals go down.
Isn't there any way to do what the dying parent does on the process manually? *sigh* |
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Vulpes_Vulpes
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Joined: 10 Dec 2003
Posts: 264
Location: Amsterdam
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| Posted: Tue Mar 16, 2004 11:08 am Post subject: |
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Maybe you want to take a look at psDoom.   |
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Flolp
n00b
Joined: 02 Jul 2003
Posts: 26
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| Posted: Tue Mar 16, 2004 11:23 am Post subject: |
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*LOL* quite a good Idea. I'll install it and see if the BFG does the job  |
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Bastux
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Joined: 15 Dec 2002
Posts: 369
Location: France - Paris
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| Posted: Tue Mar 16, 2004 11:23 am Post subject: |
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-8<---8<---TIP---8<---8<---
il you want to kill an app (e.g. firefox) and you don't want to look for its PID, just type :
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killall -s KILL firefox
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same effect as kill -9 but you call it with its name instead of its PID
Pros :
more convenient
Cons :
Kill ALL apps with that name, not just the one that crashed
It's usefull sometimes, not sure everybody knew that tip so...
-8<---8<---TIP---8<---8<--- |
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ed0n
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Joined: 23 Apr 2003
Posts: 638
Location: Prishtine/Kosove
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| Posted: Tue Mar 16, 2004 11:35 am Post subject: |
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| killall -9 process |
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Flolp
n00b
Joined: 02 Jul 2003
Posts: 26
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| Posted: Tue Mar 16, 2004 11:52 am Post subject: |
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| Yes, but what to do if not even kill -9 (or killall) works? |
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Roguelazer
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Joined: 10 Feb 2003
Posts: 1233
Location: San Francisco, CA
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| Posted: Tue Mar 16, 2004 11:52 am Post subject: |
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I do this, just to be certain:
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while (true); do killall -9 $process; done
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When it starts throwing "No process killed" messages, it's finished. I use this because sometimes things like mplayer take 20 or 30 kill messages to get the point.
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Flolp
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Joined: 02 Jul 2003
Posts: 26
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| Posted: Tue Mar 16, 2004 12:00 pm Post subject: |
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| *lol* How about calling this one "MG": "Machine Giller" |
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NiklasH
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Joined: 30 Aug 2002
Posts: 211
Location: On top of something
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| Posted: Tue Mar 16, 2004 12:51 pm Post subject: |
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A puny is no match for a stale NFS mount.
How the f*ck do you kill an NFS mount where the server has gone down or changed IP?
Is it even possible?
I can't even reboot without the famous Alt+SysRq+B when one of those has hung.
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georwell
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Joined: 25 Jun 2003
Posts: 430
Location: Uppsala, Sweden
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| Posted: Tue Mar 16, 2004 1:44 pm Post subject: |
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| Quote: | | How the f*ck do you kill an NFS mount where the server has gone down or changed IP? |
It is a very long process of unmount, unmount, unmount.... usually works for me. But damn NFS is damn near impossible to stop sometimes. I feel your pain.  |
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sapphirecat
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Joined: 15 Jan 2003
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| Posted: Tue Mar 16, 2004 4:47 pm Post subject: Re: Oh yeah -- |
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| kiosk wrote: | | Zombie processes you might have more luck with -- zombied processes are just proceses that have had their parent processes terminated prematurely. If you can find out what the parent process was and restart it, you may be able to get it to kill the child or zombie process by stopping the parent correctly. |
No, zombie processes are processes that have called exit, but their parent is still active and hasn't called wait for them. They can be reaped by killing the parent, but that doesn't have to be done "correctly" to kill the zombie. As long as the parent is gone, it'll get reparented to init which will call wait on it.
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Phant0m51
Tux's lil' helper
Joined: 30 Mar 2003
Posts: 105
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| Posted: Tue Mar 16, 2004 6:27 pm Post subject: |
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Of course, if you do want to know the PID of a process, you can just:
pidof (process)
As long as you know the name of the process, that is... |
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Lews_Therin
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Joined: 03 Oct 2003
Posts: 657
Location: Banned
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| Posted: Tue Mar 16, 2004 6:30 pm Post subject: |
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| If it just won't die, use The Button. |
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reek
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Joined: 13 Oct 2003
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| Posted: Tue Mar 16, 2004 7:57 pm Post subject: |
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Lews_Therin? Are you claiming to be the Penguin Reborn or what?
[edit]
Oh wait, my original question was supposed to be "What is the difference between kill -9 and killall?" I've never used killall and in the linux class I took I was only told about kill -9. I'd check the man pages on my linux box but it's at home and my windows and linux boxes are suddenly battling over the same IP address and I haven't fixed it yet.
[/edit] |
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Lews_Therin
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Joined: 03 Oct 2003
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Location: Banned
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| Posted: Tue Mar 16, 2004 9:07 pm Post subject: |
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| reek wrote: | Lews_Therin? Are you claiming to be the Penguin Reborn or what?
[edit]
Oh wait, my original question was supposed to be "What is the difference between kill -9 and killall?" I've never used killall and in the linux class I took I was only told about kill -9. I'd check the man pages on my linux box but it's at home and my windows and linux boxes are suddenly battling over the same IP address and I haven't fixed it yet.
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Kill -9 kills a single process, and does it no matter what the outcome might be. It's basically a power switch for processes. Killall kills multiple processes...if you have 3 Eterms open, you can do a killall Eterm and bring them all down.
And of course I am the Penguin reborn  |
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Roguelazer
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| Posted: Tue Mar 16, 2004 9:10 pm Post subject: |
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Sadly, many processes ignore kill -9 or killall -9. Like mplayer. Open mozilla with mplayerplug-in, go to some trailer site and start a movie playing. Then do a "killall mozilla" from the command line. mozilla dies, mplayer goes zombie. Both processes ignore kill -9 and killall -9. You can sometimes get away with my while statement, but usually they just ignore. I happened across this bug when mplayer caused mozilla to crash without giving a segfault, it just vanished off screen...
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Uranus
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Joined: 07 May 2002
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| Posted: Tue Mar 16, 2004 11:38 pm Post subject: |
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| dude that psdoom looks cool! Is there an ebuild out there? |
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Epyon
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Joined: 11 Sep 2003
Posts: 754
Location: NJ, USA
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| Posted: Wed Mar 17, 2004 1:09 am Post subject: |
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| Roguelazer wrote: | | Sadly, many processes ignore kill -9 or killall -9. Like mplayer. Open mozilla with mplayerplug-in, go to some trailer site and start a movie playing. Then do a "killall mozilla" from the command line. mozilla dies, mplayer goes zombie. Both processes ignore kill -9 and killall -9. You can sometimes get away with my while statement, but usually they just ignore. I happened across this bug when mplayer caused mozilla to crash without giving a segfault, it just vanished off screen... |
Yeah thats really annoying |
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lightvhawk0
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Joined: 07 Nov 2003
Posts: 388
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| Posted: Wed Mar 17, 2004 4:02 am Post subject: |
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kill a zombie = reboot/maybe stop and start it via STOP/CONT signals
NFS try kill -2 or -3
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sapphirecat
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Joined: 15 Jan 2003
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| Posted: Wed Mar 17, 2004 4:27 am Post subject: |
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| Roguelazer wrote: | | Sadly, many processes ignore kill -9 or killall -9. |
If that's true, that's a major bug.
| signal(7) wrote: | | The signals SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. |
Of course, zombies can't be killed, but that's the way the system was designed. They're rather minimal structures kept in a separate tasklist (at least for 2.6, I'm not so familiar with the 2.4 scheduler) anyway, so it doesn't really hurt much to have them lying around.
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dontremember
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Joined: 21 Sep 2002
Posts: 151
Location: Oklahoma
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| Posted: Wed Mar 17, 2004 6:16 am Post subject: |
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| loonxtall wrote: | | Roguelazer wrote: | | Sadly, many processes ignore kill -9 or killall -9. |
If that's true, that's a major bug.
| signal(7) wrote: | | The signals SIGKILL and SIGSTOP cannot be caught, blocked, or ignored. |
Of course, zombies can't be killed, but that's the way the system was designed. They're rather minimal structures kept in a separate tasklist (at least for 2.6, I'm not so familiar with the 2.4 scheduler) anyway, so it doesn't really hurt much to have them lying around. |
I think you'll find that SIGKILL and SIGSTOP cannot be caught, blocked, or ignored is not true if the process is in a device-wait state. For example, a backup program might command a tape drive to forward space by a number of blocks - it will then be waiting for the device to become ready again and will be unkillable. Once the device responds, the kill should get through and terminate the program.
Under some circumstances, however, the device may not ever respond, so the program never gets the kill. |
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