My apache children have been segfaulting for a few weeks now. My attempts
to debug them leads me to believe that its happening in php somewhere.
The SIGSEGV actually occurs in chunk_alloc, after a malloc and several
calls to execute. (I'll fwd a backtrace per the bugs docs as soon as my
gdb -p catches the SIGSEGV).
This weekend, I started apache with MALLOC_CHECK_=2 and built my php with
--enable-debug. Some interesting things started appearing in the logs:
[Sat Oct 12 19:58:16 2002] Script:
'/var/www/vhost/webmail.divinia.com/docs/src/login.php'
---------------------------------------
zend_stack.c(103) : Block 0x08C6E628 status:
Beginning: Overrun (magic=0x08415420, expected=0x7312F8DC)
[Sat Oct 12 19:58:17 2002] [notice] child pid 3037 exit signal Segmentation fault (11)
[Sat Oct 12 18:50:42 2002] Script:
'/var/www/vhost/www.divinia.com/docs/mail/src/read_body.php'
---------------------------------------
zend_stack.c(103) : Block 0x08BAF388 status:
Beginning: Overrun (magic=0x08415420, expected=0x7312F8DC)
[Sat Oct 12 18:50:42 2002] [notice] child pid 4672 exit signal Segmentation fault (11)
Then some pretty whack stuff (that looks like trampled memory) starts
showing up:
Sun Oct 13 15:08:02 2002] [notice] child pid 28803 exit signal Aborted (6)
Unknown(0) : Warning - String is not zero-terminated (base_uri) (source:
zend_execute_API.c:274)
Unknown(0) : Warning - String is not zero-terminated (ZZZZZZZZZ
�*)
(source: zend_opcode.c:159)
[Sun Oct 13 15:08:14 2002] Script:
'/var/www/vhost/webmail.divinia.com/docs/src/login.php'
---------------------------------------
zend_opcode.c(159) : Block 0x08698778 status:
zend_variables.c(44) : Actual location (location was relayed)
Beginning: Cached (allocated on zend_language_scanner.c:4150, 9 bytes)
End: OK
---------------------------------------
��B��Bp�=X�X���B��B��B��Bph���B��B��B��B(�(��B�B�B�ݸ���(�B(�B0�B0�B8�B8�B@�B@�BH�BH�BP�BP�B��`�B`�B�#ror]
[client 66.25.48.206] File does not exist:
/var/www/vhost/www.divinia.com/docs/
Unknown(0) : Fatal error - Maximum execution time of 30 seconds exceeded
��B��Bp�=X�X���B��B��B��BpPs��B��B��B��B(�(��B�B�B�ݸ���(�B(�B0�B0�B8�B8�B@�B@�BH�BH�BP�BP�B��`�B`�B�#02]
[error] [client 66.25.48.206] File does not exist:
/var/www/vhost/www.divinia.com/docs/
images/max.gif
The PHP application is squirrelmail-1.2.8 (although its also segfaulted
with vbulletin scripts). Heres my httpd -l:
Compiled-in modules:
http_core.c
mod_env.c
mod_log_config.c
mod_mime.c
mod_negotiation.c
mod_status.c
mod_include.c
mod_autoindex.c
mod_dir.c
mod_cgi.c
mod_actions.c
mod_speling.c
mod_userdir.c
mod_alias.c
mod_rewrite.c
mod_access.c
mod_auth.c
mod_auth_mysql.c
mod_usertrack.c
mod_unique_id.c
mod_setenvif.c
mod_php4.c
mod_perl.c
mod_throttle.c
apache_ssl.c
suexec: enabled; valid wrapper /sbin/suexec
glibc-2.2.5, Linux kernel 2.4.19.
As soon as the next child segfaults, I'll forward a backtrace, but if
anyone has any comments or suggestions it'd be much appreciated.
Thanks in advance,
Aa.
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