Bug ID 744913: Tmm may be killed during snapshot creation on VMware ESXi

Last Modified: Apr 22, 2021

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6

Opened: Sep 24, 2018
Severity: 3-Major

Symptoms

tmm is sometimes killed by sod during snapshot creation when running on VMware ESXi.

Impact

Traffic processing can be severely impacted while the snapshot operation is proceeding regardless of whether tmm restarts or not. If tmm is restarted, production traffic will not be processed until it is finished restarting.

Conditions

An attempt to snapshot a running BIG-IP guest is made. This can cause the instance to be descheduled by the host upon which it is running which prevents tmm from touching its watchdog. Upon being scheduled to run, if sod runs before tmm can update the watchdog, it will kill tmm. A message indicating that tmm did not run for an extended period of time may be logged such as: 01010029:5: Clock advanced by 40124 ticks This message indicates generally that tmm did not run and can indicate other types of issues as well.

Workaround

There is no workaround at this time.

Fix Information

None

Behavior Change