CentOS - Aug 2007 - postfix - killed by signal 11 - debug help

Any suggestions to help me troubleshoot a "killed by signal 11"
problem
with Postfix?  I've Googled and fiddled, but cannot figure it out.  I 
have no idea where to look/start.

Based on this post, Wietse suggests this type of problem happens when 
there compiled with different libraries.  I tried ldd on various 
programs and found they all seemed to line up, but I know little.
http://www.security-express.com/archives/postfix/2005-12/0152.html

Logs:
[root at srv log]# grep 'killed by signal 11' maillog*
maillog:Aug 19 13:50:21 srv postfix/master[2719]: warning: process 
/usr/libexec/postfix/smtpd pid 3996 killed by signal 11
maillog.1:Aug 12 07:01:18 srv postfix/master[20954]: warning: process 
/usr/libexec/postfix/local pid 25006 killed by signal 11
maillog.1:Aug 13 06:22:38 srv postfix/master[25310]: warning: process 
/usr/libexec/postfix/cleanup pid 1195 killed by signal 11
maillog.1:Aug 13 18:02:37 srv postfix/master[25310]: warning: process 
/usr/libexec/postfix/pipe pid 6419 killed by signal 11
maillog.1:Aug 14 07:37:41 srv postfix/master[11557]: warning: process 
/usr/libexec/postfix/smtp pid 12580 killed by signal 11
maillog.1:Aug 16 14:18:04 srv postfix/master[11557]: warning: process 
/usr/libexec/postfix/smtpd pid 5323 killed by signal 11
maillog.1:Aug 17 02:37:19 srv postfix/master[11557]: warning: process 
/usr/libexec/postfix/anvil pid 9575 killed by signal 11
maillog.1:Aug 18 03:02:46 srv postfix/master[11909]: warning: process 
/usr/libexec/postfix/proxymap pid 19937 killed by signal 11
maillog.1:Aug 19 03:38:28 srv postfix/master[22278]: warning: process 
/usr/libexec/postfix/proxymap pid 28403 killed by signal 11
maillog.2:Aug  6 07:13:42 srv postfix/master[20954]: warning: process 
/usr/libexec/postfix/cleanup pid 26753 killed by signal 11
maillog.2:Aug  6 17:45:42 srv postfix/master[20954]: warning: process 
/usr/libexec/postfix/smtpd pid 31635 killed by signal 11
maillog.3:Jul 31 22:40:54 srv postfix/master[20149]: warning: process 
/usr/libexec/postfix/smtpd pid 21654 killed by signal 11
maillog.3:Aug  3 00:57:53 srv postfix/master[20149]: warning: process 
/usr/libexec/postfix/cleanup pid 10409 killed by signal 11
maillog.4:Jul 28 03:37:04 srv postfix/master[3457]: warning: process 
/usr/libexec/postfix/cleanup pid 14690 killed by signal 11
maillog.4:Jul 28 09:05:51 srv postfix/master[17435]: warning: process 
/usr/libexec/postfix/smtp pid 17490 killed by signal 11

System:
CentOS 5.0 - updated
postfix-pflogsumm-2.3.3-2.el5.centos.mysql_pgsql
postfix-2.3.3-2.el5.centos.mysql_pgsql
pam_mysql-0.6.2-4
cyrus-sasl-plain-2.1.22-4
cyrus-sasl-2.1.22-4
cyrus-sasl-md5-2.1.22-4
cyrus-sasl-sql-2.1.22-4
cyrus-imapd-utils-2.3.8-9
cyrus-imapd-devel-2.3.8-9
cyrus-sasl-lib-2.1.22-4
cyrus-sasl-devel-2.1.22-4
cyrus-sasl-gssapi-2.1.22-4
cyrus-imapd-perl-2.3.8-9
cyrus-imapd-2.3.8-9
sqlgrey-1.7.6-1
clamav-db-0.91.1-1.el5.rf
amavisd-new-2.5.2-1.el5.rf
clamav-0.91.1-1.el5.rf
mysql-5.0.22-2.1
mysql-server-5.0.22-2.1
mysql-devel-5.0.22-2.1

-- 
Sincerely,
John Thomas

On Sun, Aug 19, 2007 at 02:55:11PM -0700, John Thomas
wrote:
> Any suggestions to help me troubleshoot a "killed by signal 11"
problem
> with Postfix?  I've Googled and fiddled, but cannot figure it out.  I 
> have no idea where to look/start.
Try running a memory test (memtest86) on the machine.  One of the
standard "this machine has hardware problems" indicators is gcc dieing
with signal 11.  Maybe your postfix instance is being affected.

-- 

rgds
Stephen

John Thomas wrote:
> Any suggestions to help me troubleshoot a "killed by signal 11"
problem
> with Postfix?  I've Googled and fiddled, but cannot figure it out.  I 
> have no idea where to look/start.
> 
Debug with gdb. Enable in main.cf

debugger_command           PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
          gdb $daemon_directory/$process_name $process_id 2>&1 > 
$config_directory/$process_name.$process_id.log & sleep 5

debug_peer_level = 2

#debug_peer_list = some.domain

Set some.domain to an ip address of a host where you can run telnet to 
connect to port 25 of the postfix server.

This will create a file(s) in /etc/postfix