Bug ID 851581: Server-side detach may crash TMM

Last Modified: Jun 24, 2020

Bug Tracker

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

Known Affected Versions:
14.1.0,,,,,,, 14.1.2,,,,,,, 15.0.0, 15.0.1,,,, 15.1.0,,,

Opened: Nov 20, 2019
Severity: 2-Critical


TMM crash with 'server drained' panic string.


TMM crash, failover, brief traffic outage. Traffic disrupted while tmm restarts.


-- Server-side flow is detached while the proxy is still buffering data for the pool member and the client continues to send data. -- The detach may be triggered by the LB::detach iRule commands or internally.


-- In cases in which the detach is triggered internally, there is no workaround. -- In cases in which the detach is triggered by LB::Detach, make sure the command is not executed when a request may still be in progress by using it in response events, for example HTTP_RESPONSE, USER_RESPONSE, etc.

Fix Information


Behavior Change