Hi all,
we experience a lot of threads segfaulting with our Apaches. There are
about 300 dying threads per day. The error in syslog is the following:
Apr 16 23:51:41 foo-bar kernel: httpd[24629]: segfault at
00007fffae529f98 rip 00002b2ffd6408b7 rsp 00007fffae529ea0 error 6
I wish I could give you some kind of trace or core file. But we don't
get a core file since only threads die and not the root-process. I also
tried to strace the Apache but this slowed the server down too much. And
the error appears only on the live system with a very high load. Any
ideas welcome here.
At the same time we get broken TCP packets with a wrong window size
which looks like this:
Apr 17 00:14:17 foo-bar kernel: TCP: Treason uncloaked! Peer
84.175.98.78:2637/80 shrinks window 1785243455:1785255071. Repaired.
The information I found on the net are very contradictory, so I can't
estimate the impact on the system.
The box is used for dynamic webpages on PHP. Below are some system
information.
Sorry, this is not very much information but I'm still at the beginning
of my Apache leraning curve.
Thx and cheers,
---
Markus Meyer
Some system info:
# uname -a
Linux wkw-fra2 2.6.18-4-amd64 #1 SMP Fri May 4 00:37:33 UTC 2007 x86_64
GNU/Linux
from httpd.conf
================
ServerLimit 1800
StartServers 250
MinSpareServers 64
MaxSpareServers 128
MaxClients 1200
Timeout 60
KeepAlive On
KeepAliveTimeout 2
MaxKeepAliveRequests 128
MaxRequestsPerChild 10000
LoadModule authz_owner_module modules/mod_authz_owner.so
LoadModule ext_filter_module modules/mod_ext_filter.so
LoadModule env_module modules/mod_env.so
LoadModule mime_magic_module modules/mod_mime_magic.so
LoadModule expires_module modules/mod_expires.so
LoadModule autoindex_module modules/mod_autoindex.so
LoadModule asis_module modules/mod_asis.so
LoadModule info_module modules/mod_info.so
LoadModule cgi_module modules/mod_cgi.so
LoadModule negotiation_module modules/mod_negotiation.so
LoadModule actions_module modules/mod_actions.so
LoadModule php5_module modules/libphp5.so
CoreDumpDirectory /var/log/apache/core
UseCanonicalName On
TypesConfig /etc/apache2/conf-prefork/mime.types
DefaultType text/plain
MIMEMagicFile /etc/apache2/conf-prefork/magic
HostnameLookups Off
PHP version
============
# ./php --version
PHP 5.2.3 (cli) (built: Jun 17 2007 21:46:02)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
with eAccelerator v0.9.5.2, Copyright (c) 2004-2006 eAccelerator,
by eAccelerator
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