segmentation

[madunix at gmail.com]

I am running Web apache2 server on RHEL6.1 64bit
[root at server1 lib]# rpm -aq | grep http
httpd-2.2.15-9.el6_1.2.x86_64
httpd-devel-2.2.15-9.el6_1.2.x86_64
httpd-manual-2.2.15-9.el6_1.2.noarch
httpd-tools-2.2.15-9.el6_1.2.x86_64
jakarta-commons-httpclient-3.1-0.6.el6.x86_64

In the apache log I keep getting
[root at server1 httpd]# tail -f error_log
[Sun Sep 04 16:44:13 2011] [notice] child pid 2581 exit signal
Segmentation fault (11)
[Sun Sep 04 16:44:16 2011] [notice] child pid 10754 exit signal
Segmentation fault (11)
[Sun Sep 04 16:44:20 2011] [notice] child pid 10777 exit signal
Segmentation fault (11)
[Sun Sep 04 16:44:20 2011] [notice] child pid 10779 exit signal
Segmentation fault (11)
[Sun Sep 04 16:47:03 2011] [error] [client 10.5.1.32] Invalid method
in request exit
[Sun Sep 04 16:50:22 2011] [error] [client 10.6.40.55] Directory index
forbidden by Options directive: /var/www/html/
[Sun Sep 04 16:50:23 2011] [error] [client 10.6.40.55] File does not
exist: /var/www/html/favicon.ico
[Sun Sep 04 16:50:27 2011] [notice] child pid 10786 exit signal
Segmentation fault (11)
[Sun Sep 04 16:50:27 2011] [notice] child pid 10790 exit signal
Segmentation fault (11)
[Sun Sep 04 16:51:26 2011] [notice] child pid 11016 exit signal
Segmentation fault (11)

[root at server1 yum.repos.d]# free -m
             total       used       free     shared    buffers     cached
Mem:         15941       1652      14289          0        128        597
-/+ buffers/cache:        926      15015
Swap:        18127          0      18127
[root at server1 yum.repos.d]# uname -a
Linux server1.cdsjordan.com 2.6.32-131.12.1.el6.x86_64 #1 SMP Sun Jul
31 16:44:56 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux
[root at server1 yum.repos.d]#

Could it be hardware problem RAM issue, or bug with php and apache?

the following php module are installed
[root at server1 yum.repos.d]# rpm -aq | grep php
php-mysql-5.3.3-3.el6.x86_64
php-mbstring-5.3.3-3.el6.x86_64
php-pspell-5.3.3-3.el6.x86_64
php-devel-5.3.3-3.el6.x86_64
php-pdo-5.3.3-3.el6.x86_64
php-ldap-5.3.3-3.el6.x86_64
php-tidy-5.3.3-3.el6.x86_64
php-zts-5.3.3-3.el6.x86_64
php-common-5.3.3-3.el6.x86_64
php-cli-5.3.3-3.el6.x86_64
php-odbc-5.3.3-3.el6.x86_64
php-soap-5.3.3-3.el6.x86_64
php-imap-5.3.3-3.el6.x86_64
php-snmp-5.3.3-3.el6.x86_64
php-process-5.3.3-3.el6.x86_64
phpmyadmin-2.11.11.3-2.el6.rf.noarch
php-mcrypt-5.3.2-3.el6.x86_64
php-eaccelerator-0.9.6.1-1.el6.x86_64
php-pear-1.9.0-2.el6.noarch
php-pecl-memcache-3.0.5-3.el6.x86_64
php-recode-5.3.3-3.el6.x86_64
php-enchant-5.3.3-3.el6.x86_64
php-bcmath-5.3.3-3.el6.x86_64
php-gd-5.3.3-3.el6.x86_64
php-xmlrpc-5.3.3-3.el6.x86_64
php-intl-5.3.3-3.el6.x86_64
php-5.3.3-3.el6.x86_64
php-mssql-5.3.2-3.el6.x86_64
php-pgsql-5.3.3-3.el6.x86_64
php-embedded-5.3.3-3.el6.x86_64
php-dba-5.3.3-3.el6.x86_64
php-xml-5.3.3-3.el6.x86_64

What could be the problem....?