Description:
------------
We have dedicated server on that Drupal based flash archade website has hosted. Per day 2500 visitors and 150 users are online normally.  Now server creating the Signal Bus error and Apache gets crash.  If you possible please help me to resolve this issue.

 # grep 'exit signal Bus' error_log

 [Wed Jul 16 21:18:45 2008] [notice] child pid 19433 exit signal Bus error
 (7)
 [Wed Jul 16 22:12:56 2008] [notice] child pid 22194 exit signal Bus error
 (7)
 [Wed Jul 16 23:08:53 2008] [notice] child pid 31096 exit signal Bus error
 (7)
 [Wed Jul 16 23:30:29 2008] [notice] child pid 1139 exit signal Bus error
 (7)
 [Thu Jul 17 00:09:58 2008] [notice] child pid 3336 exit signal Bus error
 (7)
 [Thu Jul 17 00:28:03 2008] [notice] child pid 6256 exit signal Bus error
 (7)
 [Thu Jul 17 00:53:55 2008] [notice] child pid 7459 exit signal Bus error
 (7)

 We had test the Memory and Hardware test. But both of them passed (DC people checked) and also RHEL4 OS Reload with 64 bit.

 Server Details:
 --------------------

 CPU           :  Intel(R) Xeon(R) CPU X3210 @ 2.13GHz (4 CPU)
 CPU MHz   :  2133.413
 RAM          :  4 GB
 Apache      :  2.0 (Previously tested with 2.2.9)
 PHP          :  5.2.5
 MySQL      :  5.0.1 (Running separate box)

 Current Apache Settings:
 ----------------------------------

 KeepAlive On
 MaxKeepAliveRequests 0
 KeepAliveTimeout 5
 UseCanonicalName Off
 <IfModule prefork.c
 StartServers 5
 MinSpareServers 5
 MaxSpareServers 10
 ServerLimit 2000
 MaxClients 2000
 MaxRequestsPerChild 0
 </IfModule

 Previous Apache Settings:
 --------------------------------------

 (Tried with below apache settings on that time also the signal bus error
 created )

 Apache 2.2.9 with eAccelerator compailed.

 KeepAlive Off
 MaxKeepAliveRequests 50
 KeepAliveTimeout 10
 UseCanonicalName Off
 <IfModule prefork.c
 StartServers 16
 MinSpareServers 8
 MaxSpareServers 64
 ServerLimit 500
 MaxClients 500
 MaxRequestsPerChild 10000
 </IfModule

 Compiled in modules:
 --------------------------------

 core.c mod_access.c mod_auth.c mod_include.c mod_log_config.c mod_logio.c mod_env.c mod_expires.c mod_headers.c mod_unique_id.c
 mod_setenvif.c mod_proxy.c proxy_connect.c proxy_ftp.c proxy_http.c
 mod_ssl.c prefork.c http_core.c mod_mime.c mod_status.c  mod_autoindex.c mod_asis.c mod_info.c mod_suexec.c mod_cgi.c    mod_negotiation.c mod_dir.c mod_imap.c mod_actions.c mod_userdir.c
 mod_alias.c mod_rewrite.c mod_so.c

http://www.webhostingtalk.com/showthread.php?t=706656&highlight=signal+bus+error
http://www.webhostingtalk.com/search.php?searchid=5837019