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Debugging segmentation fault in Apache?

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We are running debian linux stable (Jessie) with apache 2.4.10 and mod_wsgi 4.3.0-1 on a x86_64 machine. Our application is written in python 2.7 and django 1.8.

The list of modules as reported by apachectl -M are:Loaded Modules: core_module (static) so_module (static) watchdog_module (static) http_module (static) log_config_module (static) logio_module (static) version_module (static) unixd_module (static) access_compat_module (shared) alias_module (shared) auth_basic_module (shared) authn_core_module (shared) authn_file_module (shared) authz_core_module (shared) authz_host_module (shared) authz_user_module (shared) autoindex_module (shared) cgi_module (shared) deflate_module (shared) dir_module (shared) env_module (shared) filter_module (shared) mime_module (shared) mpm_worker_module (shared) negotiation_module (shared) perl_module (shared) rewrite_module (shared) setenvif_module (shared) socache_shmcb_module (shared) status_module (shared) wsgi_module (shared)

We were getting segmentation faults when rest api clients were making requests. The apache error log has the following messages:

[Mon Jul 27 09:04:38.375433 2015] [core:notice] [pid 32693:tid 140315326191488] AH00052: child pid 32700 exit signal Segmentation fault (11)
[Mon Jul 27 09:04:38.375556 2015] [core:notice] [pid 32693:tid 140315326191488] AH00052: child pid 32701 exit signal Segmentation fault (11)

I have enabled core dumps by setting ulimit to unlimited and adding core dump config directive in the apache2.conf file.
but the core dumps are not happening. When I tried to debug using gdb (gdb /usr/sbin/apache2), the environment variables are not getting read. Any clues on how to go about this?

posted Jul 27, 2015 by anonymous

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1 Answer

+1 vote

Indeed, the Debian Jessie repos lists apache2 (2.4.10-10)
< https://packages.debian.org/jessie/apache2 >;

However, the current HTTPD (from where debian Apache2 derives) is at
2.4.16 < http://httpd.apache.org/ >

If for whatever reason you don't want to build HTTPD 2.4.16 for Jessie, I would suggest to use the Debian Stretch Apache2 repo < https://packages.debian.org/stretch/apache2 > in a test instance to find out if your segmentation fault issue disappears.

answer Jul 27, 2015 by Kiran Kumar
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