Re: Deleting Zombie Process
On Fri, 8 Aug 2003 11:03:56 -0700 (PDT), Jonathan Bartlett wrote See my rant on Zombies - should have the info you need - http://www.advogato.org/person/johnnyb/diary.html?start=31 Uhm, does not look like I made your day You say, You can't kill a zombie process because it's already dead. However, you can kill off all of the zombie processes parents until it finds one that will wait() for it. Eventually, it will get to the init() process, and the init process doesn't do hardly anything except call wait() continually, so then the zombie will go away. I have this zombie: [EMAIL PROTECTED] root]# ps aux | grep 27440 root 27440 0.0 0.0 00 ?Z07:38 0:00 [linksysmon-watc defunct] I now understand why it cannot be killed since it is already dead. Just for education purposes; however, how do I find the zombie's parent processes to kill them? My guess would be that one of these processes root 28538 0.0 0.1 5932 664 ?SAug04 0:03 /usr/bin/perl /usr/sbin/linksysmon root 28539 0.0 0.0 43764 ?SAug04 0:00 sh -c /usr/sbin/snmptrapd -C -P -F %A %y-%02.2m-%02.2l %02root 28540 0.0 0.4 11000 1760 ?SAug04 0:32 /usr/sbin/snmptrapd -C -P -F %A %y-%02.2m-%02.2l %02.2h:%02 might be the parent, but then ... -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/redhat-list
Re: Deleting Zombie Process
Uhm, does not look like I made your day No, I was complaining about Sun Support employees not knowoing about Zombie processes. It's not something that's focused on in books, but someone who works support at Sun should know better. [EMAIL PROTECTED] root]# ps aux | grep 27440 root 27440 0.0 0.0 00 ?Z07:38 0:00 [linksysmon-watc defunct] ps -ef showns parents (PPID column), and ps afx shows it in an actual process tree. I now understand why it cannot be killed since it is already dead. Just for education purposes; however, how do I find the zombie's parent processes to kill them? See above Jon -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/redhat-list
Re: Deleting Zombie Process
On Fri, 8 Aug 2003 11:35:58 -0700 (PDT), Jonathan Bartlett wrote Uhm, does not look like I made your day No, I was complaining about Sun Support employees not knowoing about Zombie processes. It's not something that's focused on in books, but someone who works support at Sun should know better. [EMAIL PROTECTED] root]# ps aux | grep 27440 root 27440 0.0 0.0 00 ?Z07:38 0:00 [linksysmon-watc defunct] ps -ef showns parents (PPID column), and ps afx shows it in an actual process tree. I now understand why it cannot be killed since it is already dead. Just for education purposes; however, how do I find the zombie's parent processes to kill them? Thank you kindly, it has been a very useful education. 28538 ?S 0:03 /usr/bin/perl /usr/sbin/linksysmon 28539 ?S 0:00 \_ sh -c /usr/sbin/snmptrapd -C -P -F %A %y-%02.2m-%02.2l %02.2h:%02.2j:%02.2k %v\n 21 1/28540 ?S 0:32 | \_ /usr/sbin/snmptrapd -C -P -F %A %y-%02.2m-%02.2l %02.2h:%02.2j:%02.2k %v\n 27440 ?Z 0:00 \_ [linksysmon-watc defunct] [EMAIL PROTECTED] root]# service linksysmon restart Stopping linksysmon Starting linksysmon 30223 pts/1S 0:00 /usr/bin/perl /usr/sbin/linksysmon 30224 pts/1S 0:00 \_ sh -c /usr/sbin/snmptrapd -C -P -F %A %y-%02.2m-%02.2l %02.2h:%02.2j:%02.2k %v\n 21 1/30225 pts/1S 0:00 \_ /usr/sbin/snmptrapd -C -P -F %A %y-%02.2m-%02.2l %02.2h:%02.2j:%02.2k %v\n My, that was easy Now I can watch to see if a linksysmon-watch call results in a zombie. Wow! Thanks. -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/redhat-list
Re: Deleting Zombie Process
See my rant on Zombies - should have the info you need - http://www.advogato.org/person/johnnyb/diary.html?start=31 Jon On Fri, 8 Aug 2003, Mike Vanecek wrote: I have searched around looking for a definition of a zombie process and found this one: a zombie process is basically an ill-behaving creature that might mess up the system (usually because it is dead but not quite dead, whereas it should be quite dead, hence the name zombie). But since linux identifies it as zombie, it's constrained to the graveyard, so that won't actually happen. The only real danger with zombies is when you have lots of them. While running top, I saw that I had a zombie process. Best I could tell, it was left over from testing linksysmon. I did a sigterm on it and trucked on. Question, I assume that a zombie is something that did not get terminated cleanly? Will I ever run into a problem with doing a sigterm on the zombie process? If yes, when and what should I watch out for? Thanks. -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/redhat-list -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/redhat-list
Deleting Zombie Process
I have searched around looking for a definition of a zombie process and found this one: a zombie process is basically an ill-behaving creature that might mess up the system (usually because it is dead but not quite dead, whereas it should be quite dead, hence the name zombie). But since linux identifies it as zombie, it's constrained to the graveyard, so that won't actually happen. The only real danger with zombies is when you have lots of them. While running top, I saw that I had a zombie process. Best I could tell, it was left over from testing linksysmon. I did a sigterm on it and trucked on. Question, I assume that a zombie is something that did not get terminated cleanly? Will I ever run into a problem with doing a sigterm on the zombie process? If yes, when and what should I watch out for? Thanks. -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/redhat-list
