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The httpd daemon did not reset an internal array for storing variables defined using the "Define" directive. Consequently, variables could be undefined after a graceful restart. httpd has been fixed to reset this internal array during a graceful restart, and variables are now correctly defined in this scenario.
Created attachment 1033646[details]
Example configuration that will lead to a crash on graceful reload
Description of problem:
Defined variables in Apache HTTP server version 2.4.x in RHEL 7 are not properly handled during graceful restarts, leading to variables suddenly becoming undefined or other unpredictable behaviour.
Version-Release number of selected component (if applicable):
Reproduced with httpd-2.4.6-31.el7.x86_64
How reproducible:
Every time.
Steps to Reproduce:
1. Define a certain set of variables (Example configuration attached)
2. Make the variable a part of a configuration item
3. Reload Apache
Actual results:
The variables apparently get undefined and any configuration using the value of the variable will result in a syntax error.
Expected results:
No errors.
Additional info:
The problem is discussed at https://bz.apache.org/bugzilla/show_bug.cgi?id=57328, and was fixed in 2.4.10.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2015-2194.html