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From Tobias Wiersch <sw...@3d4x.de>
Subject general/9568: Apache's child processes don't die and sometimes use all CPU resources!
Date Wed, 23 Jan 2002 11:10:22 GMT

>Number:         9568
>Category:       general
>Synopsis:       Apache's child processes don't die and sometimes use all CPU resources!
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Wed Jan 23 03:20:00 PST 2002
>Originator:     swift@3d4x.de
>Release:        1.3.20
Suse Linux 7.3 Kernel 2.4.16-20011220
Apache-rpm from Suse 7.3 (including mod_ssl and mod_perl).
mod_ssl/2.8.4 OpenSSL/0.9.6b mod_perl/1.26 mod_gzip/
We have a high-traffic-server here (6000 visitors/day) and one week ago I needed to reinstall
this server. I used the latest components (rpms) available @ Suse (see Environment).

But under normal load, Apache produces every 1 or 2 hours a child-process who doesn't die.
With "top" and "apachectl fullstatus" I was able to catch some information (see below). At
first I thought that the problem may be the PHP-lib but there are also other childs who doesn't
die (.gif-files for example!!). Sometimes one of these childs eats up all CPU resources. One
day there were 5 processes who eat up all CPU-time (this was severe!!)!
Then I thought the problem is in mod_gzip and I deactivated it, but after some hours there
was again one non-dying child (82,2% of CPU!).

I can make a "killall -HUP httpd" to fix the problem for a short time. There is nothing suspicious
in the error_log.

Here is the information of 4 of these processes (sorry, I was not able to catch some info
from a "CPU-time eating child" - I will send it later when I was able to catch the info):
Snippet from "top":
18835 wwwrun     9   0  9436 5148  3408 S     0.0  0.8   0:42 httpd
18818 wwwrun     9   0  9720 5472  2624 S     0.3  0.8   0:39 httpd
19008 wwwrun     9   0  9836 5660  2892 S     0.0  0.8   0:39 httpd
18981 wwwrun     9   0  9876 5640  2904 S     0.1  0.8   0:38 httpd
Snippet from "apachectl fullstatus":
Srv   PID   Acc         M CPU   SS Req Conn Child Slot Host            VHost Request
11-2  18835 0/2255/2255 _ 42.93 53  9  0.0   5.15 5.15 193.98.108.XXX  www.mageknight.de GET
/banner.swift?NoBG=1&CloseOpt=0&Closed=0&MK=1 HTTP/1.0
0-2   18818 1/2193/2193 K 39.55  6  0  0.8   3.94 3.94 62.54.1.XXX     www.fanpro.com GET
/fun/chatdata/bar1-9.gif HTTP/1.0
119-2 19008 0/2309/2309 _ 39.49 22  0  0.0   3.35 3.35 145.254.118.XXX www.fanpro.com GET
/forum/templates/subSilver/images/icon_edit_german.gif HTTP
92-2  18981 0/1993/1993 _ 37.83 15  0  0.0   6.44 6.44 195.37.69.XXX   www.fanpro.com GET
/box/b4.gif HTTP/1.0
I cannot reproduce the problem because it seems to happen randomly.
Thanks for your help and support!
T.Wiersch from germany


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