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From: Borut Mrak <b@aufbix.org>
Organization: Anonymous Attitude Readjusters Association
To: users@httpd.apache.org
Date: Thu, 29 May 2003 14:22:10 +0200
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Subject: [users@httpd] apache 2.0.x freezing when using perchild mpm

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The subject says it all...

At first I thought this is somehow related to PHP, but I commented out almo=
st=20
all of the modules, and it still happens on static content.

error log (LogLevel debug):

Lots of these (normal):
[Thu May 29 13:20:48 2003] [debug] perchild.c(1790): Determining if request=
=20
should be passed. Child Num: 2, SD: 6, sd from table: 16, hostname from=20
server: www3.example.com

And then:

[Thu May 29 13:20:48 2003] [debug] perchild.c(1799): Passing request.
[Thu May 29 13:20:48 2003] [debug] perchild.c(1655): passing request to=20
another child.  Vhost: www3.example.com, child 2 7
[Thu May 29 13:20:48 2003] [debug] perchild.c(1707): Writing message to 7,=
=20
passing sd:  22
[Thu May 29 13:20:48 2003] [debug] perchild.c(1717): Writing message succee=
ded=20
49

=2D From here on httpd stops serving requests. It does not refuse connectio=
ns, but=20
there are no new log entries and it doesn't return anything. Running
ab -n 10 -c 1 http://www3.example.com/zeros.txt
(zeros.txt is 10K worth of zeros) from 1 to 3 times is enough to freeze the=
=20
server, but the number of tries needed is not connected to *Threads*=20
directives (I tried to fiddle with those to see if it has any effect).

What I've found out is that the server freezes as long as it is running und=
er=20
different UIDs. If it only runs as the default user (no ChildPerUserID=20
directives), everything is fine. If ChildPerUserID # # =3D NumServers,=20
everything is fine (no httpd processes running under the default UID).

MPM config:
<IfModule perchild.c>
NumServers           8
StartThreads         20
MinSpareThreads      5
MaxSpareThreads      20
MaxThreadsPerChild   20
MaxRequestsPerChild  0
ChildPerUserId #30000 #30000 2
</IfModule>

vhost config:
NameVirtualHost xx.xx.xx.xx:80
<VirtualHost xx.xx.xx.xx:80>
  ServerAdmin webmaster@example.com
  DocumentRoot /var/www/www3.example.com
  ServerName www3.example.com

  AssignUserID #30000 #30000
</VirtualHost>

Loaded modules:
LoadModule access_module modules/mod_access.so
LoadModule log_config_module modules/mod_log_config.so
LoadModule mime_module modules/mod_mime.so
LoadModule autoindex_module modules/mod_autoindex.so
LoadModule negotiation_module modules/mod_negotiation.so
LoadModule dir_module modules/mod_dir.so
LoadModule userdir_module modules/mod_userdir.so
LoadModule alias_module modules/mod_alias.so

(I could lose some of these, but didn't want to massacre the default config=
=20
file by removing all the directives that need these modules - I could if=20
anyone thinks it might help)

Other non-default settings:
AcceptMutex flock
(the default - sysvsem doesn't work - but that's a topic for another post)

My system:
Debian 3.0
Linux 2.4.21-pre5 (also tried earlier kernels, 2.4.18 and maybe some others=
,=20
can't remember)
glibc 2.2.5-11.5
Apache 2.0.46 (also tried 45 and two or three older versions)

Httpd was configured like this:
=2E/configure --prefix=3D/opt/apache-2.0.46 --bindir=3D/usr/local/bin/=20
=2D --sbindir=3D/usr/local/sbin/ --enable-mods-shared=3Dall --with-mpm=3Dpe=
rchild=20
=2D --enable-ssl

Any ideas? I need mpm_perchild, otherwise I won't migrate this webserver to=
=20
Apache 2.0 - yet. :-)

thanks,

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Borut Mrak, b@aufbix.org
PGP: finger b@aufbix.org
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=3DEbxX
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