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From Eric Fisher <fis...@osiriscomm.com>
Subject general/5336: Apache process hangs, and parent will not die.
Date Thu, 18 Nov 1999 19:31:13 GMT

>Number:         5336
>Category:       general
>Synopsis:       Apache process hangs, and parent will not die.
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          sw-bug
>Submitter-Id:   apache
>Arrival-Date:   Thu Nov 18 11:40:01 PST 1999
>Originator:     fisher@osiriscomm.com
>Release:        1.3.9
Linux sobek.osiriscomm.com 2.2.13 #3 SMP Sat Nov 6 01:04:50 PST 1999 i686 unknown

This is a RedHat 6.1 box with a custom build of apache.
512 MB RAM on a dual Pentium III

Apache is built as:    Server Version: Apache/1.3.9 (Unix) mod_perl/1.21 PHP/3.0.12
               and     Server Version: Apache/1.3.9 (Unix) PHP/3.0.12 mod_ssl/2.4.6 OpenSSL/0.9.4
We have a failry large web server with 9 separate instances and versions of apache
running.  We have named them the following: httpd-d1, httpd-d2, httpd-d3, httpd-d4,
httpd-d5, httpd-h1, httpd-ssl, httpd-fp, and httpd-sava.

About once a day, now, we notice that the machine's load rises to about 1 and stays
there.  At this time, we try to restart the the web servers (using kill -HUP `cat /home/logs/<servername>.pid`)
and all but (usually) one server restarts.  A typical amount of traffic for one of
these servers is about 125000 connections and 1GB per day.  There are rarely any
messages in the error log for that server.  Sometimes we will see something like this, but
not always:

[Thu Nov 18 08:48:40 1999] [warn] child process 24339 still did not exit, sending a SIGTERM
[Thu Nov 18 08:48:44 1999] [error] child process 24339 still did not exit, sending a SIGKILL
[Thu Nov 18 08:49:00 1999] [notice] caught SIGTERM, shutting down

strace -p <pid> on the parent process returns nothing for the dead server.  The web
server still serves up pages through the children, but as the children die, or are killed,
they are not respawning.  So, I guess it looks like the parent is dead.  The only way 
to get that instance of apache running again is to restart the machine.

If we neglect to watch the load, then eventually the whole linux box locks up.  The
load gradually gets higher and higher after several hours of the parent being

The following is a typical httpd.conf file with some cuts made in the VirtualHost section:

ServerType standalone
ServerRoot "/var/lib/httpd"
PidFile /var/lib/httpd/logs/d1.pid
ScoreBoardFile /home/logs/d1.scoreboard
ResourceConfig /dev/null
AccessConfig /dev/null
Timeout 300
KeepAlive On
MaxKeepAliveRequests 256
KeepAliveTimeout 15
MinSpareServers 5
MaxSpareServers 15
StartServers 10
MaxClients 256
MaxRequestsPerChild 100000
ExtendedStatus On
#Port 80
User nobody
Group www
ServerAdmin support@osiriscomm.com
ServerName domain1.osiriscomm.com
DocumentRoot "/var/lib/httpd/htdocs"

<Directory />
    Options All
#    AllowOverride None

<Directory "/var/lib/httpd/conf/htdocs">
    Options All
    AllowOverride None
    Order allow,deny
    Allow from all

<Location /server-status>
        SetHandler server-status
        Order deny,allow
        Deny from all
        Allow from
        Allow from
        Allow from

<Location /server-info>
        SetHandler server-info
        Order deny,allow
        Deny from all
        Allow from
        Allow from
        Allow from

#UserDir public_html

DirectoryIndex index.html index.htm index.shtml index.php3 index.cgi

AccessFileName .htaccess

<Files ~ "^\.ht">
    Order allow,deny
    Deny from all
UseCanonicalName On
TypesConfig /etc/httpd/conf/mime.types
DefaultType text/plain
HostnameLookups On
ErrorLog /home/logs/server/d1_error_log
LogLevel warn
LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %b" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent
CustomLog /home/logs/server/d1_access_log common
ServerSignature On

Alias /icons/ "/var/lib/httpd/icons/"
Alias /img-osiris/ "/var/lib/httpd/htdocs/images/"
<Directory "/var/lib/httpd/icons">
    Options Indexes MultiViews
    AllowOverride None
    Order allow,deny
    Allow from all

ScriptAlias /cgi-bin/ /var/lib/httpd/cgi-bin/
ScriptAlias /cgi-osiris/ /var/lib/httpd/cgi-bin/

# "/var/lib/httpd/conf/cgi-bin" should be changed to whatever your ScriptAliased
# CGI directory exists, if you have that configured.
<Directory "/var/lib/httpd/cgi-bin">
    AllowOverride None
    Options None
    Order allow,deny
    Allow from all

IndexOptions FancyIndexing
AddIconByEncoding (CMP,/icons/compressed.gif) x-compress x-gzip

AddIconByType (TXT,/icons/text.gif) text/*
AddIconByType (IMG,/icons/image2.gif) image/*
AddIconByType (SND,/icons/sound2.gif) audio/*
AddIconByType (VID,/icons/movie.gif) video/*

AddIcon /icons/binary.gif .bin .exe
AddIcon /icons/binhex.gif .hqx
AddIcon /icons/tar.gif .tar
AddIcon /icons/world2.gif .wrl .wrl.gz .vrml .vrm .iv
AddIcon /icons/compressed.gif .Z .z .tgz .gz .zip
AddIcon /icons/a.gif .ps .ai .eps
AddIcon /icons/layout.gif .html .shtml .htm .pdf
AddIcon /icons/text.gif .txt
AddIcon /icons/c.gif .c
AddIcon /icons/p.gif .pl .py
AddIcon /icons/f.gif .for
AddIcon /icons/dvi.gif .dvi
AddIcon /icons/uuencoded.gif .uu
AddIcon /icons/script.gif .conf .sh .shar .csh .ksh .tcl
AddIcon /icons/tex.gif .tex
AddIcon /icons/bomb.gif core

AddIcon /icons/back.gif ..
AddIcon /icons/hand.right.gif README
AddIcon /icons/folder.gif ^^DIRECTORY^^
AddIcon /icons/blank.gif ^^BLANKICON^^

DefaultIcon /icons/unknown.gif

ReadmeName README
HeaderName HEADER

# IndexIgnore is a set of filenames which directory indexing should ignore
# and not include in the listing.  Shell-style wildcarding is permitted.
IndexIgnore .??* *~ *# HEADER* README* RCS CVS *,v *,t

# AddEncoding allows you to have certain browsers (Mosaic/X 2.1+) uncompress
# information on the fly. Note: Not all browsers support this.
# Despite the name similarity, the following Add* directives have nothing
# to do with the FancyIndexing customization directives above.
AddEncoding x-compress Z
AddEncoding x-gzip gz tgz

# AddLanguage allows you to specify the language of a document. You can
# then use content negotiation to give a browser a file in a language
# it can understand.  Note that the suffix does not have to be the same
# as the language keyword --- those with documents in Polish (whose
# net-standard language code is pl) may wish to use "AddLanguage pl .po"
# to avoid the ambiguity with the common suffix for perl scripts.
AddLanguage en .en
AddLanguage fr .fr
AddLanguage de .de
AddLanguage da .da
AddLanguage el .el
AddLanguage it .it

# LanguagePriority allows you to give precedence to some languages
# in case of a tie during content negotiation.
# Just list the languages in decreasing order of preference.
LanguagePriority en fr de

# AddType allows you to tweak mime.types without actually editing it, or to
# make certain files to be certain types.
# For example, the PHP3 module (not part of the Apache distribution - see
# http://www.php.net) will typically use:
AddType application/x-httpd-php3 .php3
AddType application/x-httpd-php3-source .phps

AddType application/x-tar .tgz

# AddHandler allows you to map certain file extensions to "handlers",
# actions unrelated to filetype. These can be either built into the server
# or added with the Action command (see below)
# If you want to use server side includes, or CGI outside
# ScriptAliased directories, uncomment the following lines.
# To use CGI scripts:
AddHandler cgi-script .cgi
AddHandler cgi-script .pl

# To use server-parsed HTML files
AddType text/html .shtml
AddHandler server-parsed .shtml

# Uncomment the following line to enable Apache's send-asis HTTP file
# feature
#AddHandler send-as-is asis

# If you wish to use server-parsed imagemap files, use
AddHandler imap-file map

# To enable type maps, you might want to use
#AddHandler type-map var

BrowserMatch "Mozilla/2" nokeepalive
BrowserMatch "MSIE 4\.0b2;" nokeepalive downgrade-1.0 force-response-1.0
BrowserMatch "RealPlayer 4\.0" force-response-1.0
BrowserMatch "Java/1\.0" force-response-1.0
BrowserMatch "JDK/1\.0" force-response-1.0

# Enable/disable the handling of HTTP/1.1 "Via:" headers.
# ("Full" adds the server version; "Block" removes all outgoing Via: headers)
# Set to one of: Off | On | Full | Block
#ProxyVia On

### Section 3: Virtual Hosts

The problem seems to be the cause.  It typically happens every 24 hours or so.
If we increase the MaxRequestsPerChild then it will last longer, if we decrease
it then the server dies sooner.  Would happen once a week when it was set to 0...
once every 10 hours when it was 10000
For now we restart the servers regularly and monitor the load.  We really need a
fix, though.
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