Apache2 PHP mod_fcgi HTTP 500 errors

Hi All,

Any type of  help on the following problem would be greatly appreciated.

We thought everything is running smoothly until a few days ago. We 
discovered
a few HTTP 500 errors in the access log file. The additional PHP error 
log file
did not show any error message. So we ruled out a problem with the 
application.
The problem occurs sporadic a few times each day since we installed the 
server with
the required FCGI components.

We currently using the following components on our server:

Apache/2.0.54 (Debian GNU/Linux)
mod_fastcgi/mod_fastcgi-SNAP-0404142202
mod_suexec.so
PHP 4.4.0
(please note: all! configuration values for mod_fcgi and php_cgi are set 
to default
except for PHP_FCGI_CHILDREN=10)

It's hard to reproduce the problem, but putting heavy http load on the 
server produces
the problem more frequently.

I searched this mailing list and there seam to be similar cases, but 
none of the answers
really solve the problem. Deploying fcgid seams to be the common fix, 
but I am
not willing to give up on mod_fcgi just yet.

I spend a lot of time last week figuring out what the root cause is and 
this is what I have:

I think the information below shows quite clearly that the fcgi-pm(?) 
terminates the
php process while 2 of it's child processes still work on a request.

Thanks for having a look into this ...
    Stefan Wendt

PS before failure
---
test     10414  0.0  0.3 10552 3616 ?        Ss   10:34   0:00  |   \_ 
/usr/local/php_fcgi_4.4.0/bin/php
test     21061  8.5  0.9 14996 8748 ?        S    11:01   0:12  |   |   
\_ /usr/local/php_fcgi_4.4.0/bin/php
[... 9 more lines ]
test     17287  0.0  0.3 10556 3620 ?        Ss   10:54   0:00  |   \_ 
/usr/local/php_fcgi_4.4.0/bin/php
test     17288  7.7  0.9 15004 8760 ?        S    10:54   0:44  |   |   
\_ /usr/local/php_fcgi_4.4.0/bin/php
[... 9 more lines ]

Apache Access Logfile:
---
[...]
81.169.x.x - - [24/Oct/2005:11:04:24 +0100] "GET 
/hotels/Test/bookings/client.php?formname=multi_day_availability 
HTTP/1.0" 200 49901 "-" "ApacheBench/2.0.41-dev"
81.169.x.x - - [24/Oct/2005:11:04:24 +0100] "GET 
/hotels/Test/bookings/client.php?formname=multi_day_availability 
HTTP/1.0" 500 698 "-" "ApacheBench/2.0.41-dev"
81.169.x.x - - [24/Oct/2005:11:04:24 +0100] "GET 
/hotels/Test/bookings/client.php?formname=multi_day_availability 
HTTP/1.0" 500 698 "-" "ApacheBench/2.0.41-dev"
[...]

global Apache Error Logfile:
---
[Mon Oct 24 11:04:24 2005] [warn] FastCGI: (dynamic) server 
"/home/test/test.avvio.com/php-fcgi/php-fcgi-starter" (pid 17287) 
termination signaled
[Mon Oct 24 11:04:24 2005] [warn] FastCGI: (dynamic) server 
"/home/test/test.avvio.com/php-fcgi/php-fcgi-starter" (pid 17287) 
terminated by calling exit with status '0'


Trace of the PHP mother processes:
---
somehost:~# strace -p 17287
Process 17287 attached - interrupt to quit
wait4(-1, 0xbfd44944, 0, NULL)          = ? ERESTARTSYS (To be restarted)
--- SIGTERM (Terminated) @ 0 (0) ---
rt_sigaction(SIGTERM, {SIG_DFL}, NULL, 8) = 0
kill(-17287, SIGTERM)                   = 0
--- SIGCHLD (Child exited) @ 0 (0) ---
exit_group(0)                           = ?
Process 17287 detached
ds80-237-153-8:~#

PS after failure:
---
test     10414  0.0  0.3 10552 3616 ?        Ss   10:34   0:00  |   \_ 
/usr/local/php_fcgi_4.4.0/bin/php
test     21061  8.7  0.9 14996 8748 ?        S    11:01   0:14  |   |   
\_ /usr/local/php_fcgi_4.4.0/bin/php
[... 9 more line ]


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