Bug 1666676

Description of problem:

When performing graceful reloads of Apache with this module active, the semaphore count increments by one. This will occur indefinitely until the service is either restarted or eventually reaches the max semaphore per process defined for the operating system in question. Reaching the limit results in the process crashing.

Version-Release number of selected component (if applicable):

11.5

How reproducible:

Easily re-produced.

Steps to Reproduce:
1. Install httpd.x86_64 2.4.X from CentOS updates repo.
2. Install mod_qos 11.5 from EPEL repo.
3. Ensure this module is included in Apache configuration to be loaded.
4. Start Apache and then perform reloads with the module loaded to increment the semaphore count.

Actual results:

Semaphore count increases by one each time a reload is performed.

Expected results:

Semaphore count should not increase on a reload.

Additional info:

mod_qos 11.5 is the latest stable packaged up version provided by EPEL. Version 11.21 is stated to of fixed the leak as per the official mod_qos change documentation linked below (1). Even higher versions of the source are available, but none over version 11.5 are packaged up in EPEL making them difficult to manage on a standard build.

(1) https://fossies.org/linux/mod_qos/doc/CHANGES.txt