I've been seeing lots of the following error in my error_log recently, I've enabled core dumps and have managed to analyse one using gdb: [Fri Nov 29 20:44:41.318847 2013] [core:notice] [pid 2307] AH00051: child pid 7504 exit signal Segmentation fault (11), possible coredump in /tmp/core-dump [Fri Nov 29 20:44:41.318937 2013] [core:notice] [pid 2307] AH00051: child pid 7623 exit signal Segmentation fault (11), possible coredump in /tmp/core-dump [Fri Nov 29 20:44:43.324859 2013] [core:notice] [pid 2307] AH00051: child pid 7724 exit signal Segmentation fault (11), possible coredump in /tmp/core-dump Code (markup): GDB Analysis of Core Dump File Core was generated by `/usr/local/apache/bin/httpd -k start -DSSL'. Program terminated with signal 11, Segmentation fault. #0 0x00007fcc9b259798 in apr_uri_parse () from /usr/local/apache/lib/libaprutil-1.so.0 Code (markup): Backtrace #0 0x00007fcc9b259798 in apr_uri_parse () from /usr/local/apache/lib/libaprutil-1.so.0 #1 0x00000000004f1e09 in stapling_renew_response () #2 0x00000000004f2f58 in stapling_cb () #3 0x0000003f4022b431 in ssl_check_clienthello_tlsext () from /usr/lib64/libssl.so.10 #4 0x0000003f4021b9e5 in ssl3_get_client_hello () from /usr/lib64/libssl.so.10 #5 0x0000003f4021db6f in ssl3_accept () from /usr/lib64/libssl.so.10 #6 0x0000003f402290d9 in ssl23_get_client_hello () from /usr/lib64/libssl.so.10 #7 0x0000003f402298b3 in ssl23_accept () from /usr/lib64/libssl.so.10 #8 0x00000000004dc63c in ssl_io_filter_handshake () #9 0x00000000004dd641 in ssl_io_filter_input () #10 0x000000000043e61c in ap_get_brigade () #11 0x0000000000440d8e in ap_rgetline_core () #12 0x000000000044161f in read_request_line () #13 0x0000000000442e30 in ap_read_request () #14 0x0000000000497045 in ap_process_http_sync_connection () #15 0x00000000004970a3 in ap_process_http_connection () #16 0x000000000046ba8f in ap_run_process_connection () #17 0x000000000046bf66 in ap_process_connection () #18 0x000000000051c378 in child_main () #19 0x000000000051c58e in make_child () #20 0x000000000051c943 in perform_idle_server_maintenance () #21 0x000000000051d0b5 in prefork_run () #22 0x000000000043bf35 in ap_run_mpm () #23 0x000000000043423c in main () Code (markup): It seems the function apr_uri_parse() causes the issues and is located in /usr/local/apache/lib/. I don't really know what to do next with regards to fixing this? The mentioned file is editable as it is `.so` and I cannot find any other occurrences of it with other people? My software is all up to date, including CentOS, Apache, php. A new apache build did not fix this issue either.
Check if apache using correct library, for example: root@node5 [~]# ldd /usr/local/apache/bin/httpd |grep libaprutil libaprutil-1.so.0 => /usr/local/apache/lib/libaprutil-1.so.0 (0x00007f6578a06000) root@node5 [~]# ll /usr/local/apache/lib/libaprutil-1.so.0 lrwxrwxrwx 1 root root 21 Nov 17 17:24 /usr/local/apache/lib/libaprutil-1.so.0 -> libaprutil-1.so.0.5.2* Code (markup):
Enable coredump in httpd.conf. For that add the following directive to /usr/local/apache/conf/httpd.conf : CoreDumpDirectory /tmp/httpdump