Bug ID 958465: in BIG-IP Virtual Edition, TMM may prematurely shut down during initialization

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 16.0.0, 16.0.0.1, 16.0.1, 16.0.1.1

Fixed In:
16.1.0, 16.0.1.2, 15.1.3.1, 14.1.4.4

Opened: Oct 23, 2020
Severity: 3-Major

Symptoms

TMM may prematurely shut down during its initialization when several TMMs and interfaces are configured. The system logs messages in one or more TMM log files (/var/log/tmm*): MCP connection aborted, exiting.

Impact

TMM shuts down prematurely. Traffic disrupted while tmm restarts. Possible deadlock and MCP restart loop requiring a full reboot of the BIG-IP device.

Conditions

-- BIG-IP Virtual Edition (VE). -- Happens during TMM startup. -- The issue is intermittent, but is more likely to occur on systems with a lot of TMMs (more 20 in most cases) and several interfaces (approximately 8 or more).

Workaround

None.

Fix Information

A new TCL configuration element was added: "max_poll_pre_rfw", with a default value of 4, to modulate the function of "max_poll" in TMMs which are not yet Ready-For-World. The value of "max_poll_pre_rfw" can be configured in the "tmm_base.tcl" file.

Behavior Change