Daniel A. Ramaley wrote:
Hello. I have been struggling for a few months to solve a problem with
an Apache web server. First i'll try to describe the symptoms, then
give details about the configuration and what i have tried so far. I
would greatly appreciate any suggestions on how to diagnose and correct
the problem.
Symptom 1:
After starting Apache during periods of high load the server appears to
run fine for awhile ("awhile" is highly variable but on the order of 90
minutes) then starts returning empty pages. When the empty pages start,
Apache's error_log gets filled with lines like this:
[Thu Sep 07 09:09:11 2006] [notice] child pid 3579 exit signal
Segmentation fault (11), possible coredump in /etc/httpd/core
These errors are very intermittent during periods of light load. I have
had CoreDumpDirectory defined for awhile and have amassed quite a
collection of core files. This is the first few lines of what gdb
reports for one of them:
(gdb) bt
#0 0x0000002a99ff2492 in preg_replace_impl (ht=Variable "ht" is not
available.)
at /usr/src/redhat/BUILD/php-4.3.9/ext/pcre/php_pcre.c:1154
#1 0x0000002a9a0ac255 in execute (op_array=0x552afe2798)
at /usr/src/redhat/BUILD/php-4.3.9/Zend/zend_execute.c:1640
#2 0x0000002a9a0a9386 in execute (op_array=0x552aff7fb8)
at /usr/src/redhat/BUILD/php-4.3.9/Zend/zend_execute.c:1684
#3 0x0000002a9a0a9386 in execute (op_array=0x552b0e26c8)
at /usr/src/redhat/BUILD/php-4.3.9/Zend/zend_execute.c:1684
#4 0x0000002a9a0a9386 in execute (op_array=0x552af80db8)
at /usr/src/redhat/BUILD/php-4.3.9/Zend/zend_execute.c:1684
Symptom 2:
A further symptom of problems is found in PostgreSQL's logs. The web
applications the server runs rely on PostgreSQL, which logs several
times per minute messages like this:
The php crash would probably explain the postgres problems.
You're probably better off asking the internals list,
http://www.php.net/mailing-lists.php, because they write the C code
behind PHP.
Have you run any hardware tests to make sure it's not memory/cpu related?
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