topic lsof stuck in Operating System - HP-UX

lsof stuck

Raymond Wu - MTG — Tue, 17 Apr 2007 13:28:14 GMT

What/how does lsof work? In trying to play around trying to identify Unidata user sessions and their port/pid correlation, I tried to do a lsof on one session via the "port" and the command has not returned going on now for 5 minutes. Looking for lsof, I discovered my command along with another one w/o any arguments and a PPID of 1.

Tried killing without and with -9 and yet the process prevails.

Re: lsof stuck

Aussan — Tue, 17 Apr 2007 13:31:30 GMT

what OS version do you have and also the lsof version you are running

and did you run the lsof command as root? or a user?

Re: lsof stuck

Aussan — Tue, 17 Apr 2007 13:33:33 GMT

also the exact command used

Re: lsof stuck

Raymond Wu - MTG — Tue, 17 Apr 2007 13:34:49 GMT

11.23 4.77 ran as root

Re: lsof stuck

Raymond Wu - MTG — Tue, 17 Apr 2007 13:35:52 GMT

lsof -i :199

Re: lsof stuck

Raymond Wu - MTG — Tue, 17 Apr 2007 13:39:34 GMT

was a typo - I had wanted to look at 1199 but inadvertently dropped off the trailing (or first 9). Yeah, yeah â lucky it wasnâ t a kill or something else like that. 8-).

Re: lsof stuck

Robert-Jan Goossens_1 — Tue, 17 Apr 2007 13:43:13 GMT

try adding the protcol name (udp/tcp)

# lsof -i tcp:1199

Re: lsof stuck

A. Clay Stephenson — Tue, 17 Apr 2007 13:43:35 GMT

There are two sections of the lsof man page that you should have read BEFORE using lsof: "BLOCKS AND TIMEOUTS" and "AVOIDING KERNEL BLOCKS". Lsof is kernel intrusive and can certainly block on some operations but you are allowed to adjust timeouts and void potentially blocking system calls using the -b option.

Re: lsof stuck

Raymond Wu - MTG — Tue, 17 Apr 2007 13:54:59 GMT

Okay, I have been educated as to the future use of lsof AND reading through the entire manpage of a command before trying it. But what do I do now? Do they effectively become zombies and need to wait for a reboot to clear them out? Any potential harm - reason why I am asking is that the box hasn't been rebooted in almost 1/2 year and the people here frown on even thinking of rebooting....

Re: lsof stuck

Aussan — Tue, 17 Apr 2007 13:58:49 GMT

sorry i got confused a bit

the command you are trying is lsof -i:1199 or lsof -l?

and also can you do bdf on your system

i know that sometime if i have a dead nfs mount bdf does not work, and lsof does not work also...

Re: lsof stuck

Aussan — Tue, 17 Apr 2007 14:01:38 GMT

if it's a zombie process with ppid of 1 a reboot is the only way to clear it

Re: lsof stuck

Raymond Wu - MTG — Tue, 17 Apr 2007 14:09:01 GMT

Aussan,

No, no stuck unresolvable/unmountable mounts out there - bdf works.

Killed the parent of the one I fired off; the parent died but init inherited the surviving child now so there's two zombies.

Oh well...

Re: lsof stuck

Raymond Wu - MTG — Tue, 17 Apr 2007 14:16:17 GMT

Aussan,

and the command was lsof -i :119 - was trying to find out who/what was running on 1199.

Re: lsof stuck

Raymond Wu - MTG — Tue, 17 Apr 2007 14:57:35 GMT

chalking it up to just another learning experience.