Bug ID 486514: tmm coredump seen with remote logging via TCP

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP All(all modules)

Known Affected Versions:
11.4.1, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5

Fixed In:
12.0.0, 11.5.1 HF6

Opened: Oct 23, 2014
Severity: 3-Major
Related AskF5 Article:


TMM crash and coredump while logging to remote logging server.


Traffic disrupted while tmm restarts.


This can happen when logging for AFM or other modules is turned on and one of the log destinations is a remote logging server with log messages sent over TCP transport protocol. The crash specifically occurs when transport is TCP, and an error occurs attempting to connect to the remote logging server.


Use UDP transport for the remote logging destination server.

Fix Information

Fixed the crash that occurred in the logging module when using TCP as the transport to a log destination server.

Behavior Change