500 Internal Server due to low RLimitMem value

Website was causing 500 Internal Server error while loading the php pages. Error log was saying the error below

/usr/bin/php: error while loading shared libraries: libpthread.so.0: failed to map segment from shared object: Cannot allocate memory

Investigation led the issue to be RLimitMem directive enabled by the client being too low. RLimit directives of apache often gives a false feeling of limiting the user resources.

Commenting out RLimitMem value solved the issue. If that also didn’t fix the issue, check out for the limit settings in /etc/security/limits.conf

I hope this helps a bit sometime in the future for my fellow SAGEs

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