Bug ID 920285: WS::disconnect may result in TMM crash under certain conditions

Last Modified: Sep 14, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:,, 12.1.6,,,, 13.1.4,, 13.1.5,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,,,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,, 15.1.9,, 15.1.10

Opened: Jun 23, 2020

Severity: 3-Major


The WebSocket profile allows use of the WS::disconnect iRule command to gracefully terminate a connection with a client or a server. Use of this command may result in crash if tmm parts the iRule before execution completes.


Traffic disrupted while tmm restarts.


-- BIG-IP has a virtual server configured with a WebSocket profile. -- An iRule the includes the WS::disconnect command is attached to the virtual server. -- BIG-IP is under heavy load and/or the iRule requires an extended time to execute, which might happen, for example, during execution on an iRule, tmm might park the iRule execution because the operation takes more CPU cycle than tmm can allocate to complete the iRule execution.



Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips