Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.0.0, 11.1.0, 11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5
Fixed In:
11.6.0, 11.5.2, 11.5.1 HF6
Opened: May 09, 2014 Severity: 3-Major Related Article:
K15476
Large objects in the session database can cause TMM to core in HA configurations.
The Traffic Management Microkernel (TMM) may produce a core file when using an iRule table command with large datasets, and the BIG-IP system will temporarily fail to process traffic as it recovers from TMM restarting.
This issue occurs when all of the following conditions are met: An iRule contains a table command, such as set, add or replace, which attempts to insert a large set of data (more than 128k): -- Session mirroring is enabled between BIG-IP high-availability devices. Note: Session mirroring is enabled by default through the StateMirror.MirrorSessions database variable.
To work around this issue, revise the iRule to avoid insertion of large datasets. Note: Changing the design of an iRule may have additional effects on traffic processing. Ensure any modification is compatible with your environment.
This release provides improved handling of large objects in the session database.