Bug ID 1327961: EAM plugin crashes

Last Modified: Dec 28, 2023

Affected Product(s):
BIG-IP APM(all modules)

Known Affected Versions:
16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1

Opened: Aug 07, 2023

Severity: 3-Major

Symptoms

EAM process was restarting and kept coring. Suspecting this as key collision. The key is generated using ftok and isn't guaranteed to avoid collisions on a large box with 18 TMMs, which creates the opportunity for collisions (more shared memory in use).

Impact

Impacts functionality.

Conditions

Errors come across when EAM plugin intialisation eam: shmget name:/var/run/tmm.mp.eam16, key:0xff14561e, size:7, total:789184 : Invalid argument

Workaround

Fixed the problem by restarting the BIG-IP The fact that a reboot clears the condition also supports this - the underlying inode being used to generate key is changed due to the a new version of the key file being created.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips