LLAWP process CPU usage goes to 100%+

Document ID : KB000045761
Last Modified Date : 14/02/2018
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Issue

- We have a new agent installation that is making the CPU usage climb to 100% + after some time. this is a production system and needs to be resolved right away. I tried to enable the trace logs from the LocalConfig.conf, but the web agent logs is not even showing any update happening on it, so it has become unresponsive.

 

Environment: 

- SPS 12.52 SP1 CR04

- RHEL 7.2/CentOS 7.2

 

Cause:

- The issue was discovered to be a "feature" integrated into RHEL 7, where the semaphores are getting removed by OS after user logout from session.

KB needed created to provide explanation about this situation.

 

Workaround:

- With RHEL/CentOS 7.2, the system logind will now remove all IPC's (semaphores) for a user when logging out. For some applications this will cause issues. On CA Single Sign-On, this causes the CPU to spike to 100% while it tries to manage the missing IPCs (semaphores). 

- As a workaround, all RHEL/CentOS 7.2 or better servers that require CA Single Sign-On will make the following changes:

1. Create directory /usr/lib/systemd/logind.conf.d 

2. Create file /usr/lib/systemd/logind.conf.d/siteminder.conf 

3. Edit file /usr/lib/systemd/logind.conf.d/siteminder.conf to contain the following: 

4. [Login]

5. RemoveIPC=noRestart the logind service - systemctl restart systemd-logind