Bug ID 1000973: Unanticipated restart of TMM due to heartbeat failure

Last Modified: Jul 27, 2021

Bug Tracker

Affected Product:  See more info
BIG-IP TMOS, vCMP(all modules)

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 16.0.0,, 16.0.1,

Fixed In:

Opened: Mar 10, 2021
Severity: 2-Critical


A tmm thread might stall while yielding the CPU, and trigger a failsafe restart of the tmm process. A core file might be generated without any message logged in /var/log/*. High resolution timers (hrtimer) may be lost.


Traffic disrupted while tmm restarts.


The conditions under which this occurs are unknown.



Fix Information

Fixed an unanticipated restart of TMM due to heartbeat failure triggered by the kernel.

Behavior Change