#4596 Mitigating HTTPD semaphore leak
Closed: fixed 6 years ago Opened 9 years ago by edewata.

The Apache HTTPD has an old semaphore leaking problem that doesn't seem to have a solution. The problem might cause unpredictable server behaviors (e.g. server hangs, installation fails). Currently the solution is to clear the semaphores using ipcrm or restart the machine, but usually that is only done after spending some time troubleshooting a non-functioning server.

To help troubleshooting, the problem and the solution should be well documented in IPA docs.

To avoid disrupted service, IPA might be able to do some preventative steps such as:

  • clearing the semaphores during server startup
  • periodically monitoring the number of semaphores (using ipcs) and restarting the server (to clear the semaphores) when it exceeds a certain limit.

See also:
https://fedorahosted.org/freeipa/ticket/3990


I do not think FreeIPA should be active in this part, this is about httpd maintenance. We did not even seen this issue hit lately, so it is not a priority.

Metadata Update from @edewata:
- Issue assigned to someone
- Issue set to the milestone: Tickets Deferred

7 years ago

3rd party bug, fixed in HTTPD.

Metadata Update from @cheimes:
- Issue close_status updated to: fixed

6 years ago

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