Bug ID 2007705: HSL can incorrectly handle pending TCP connections leading to a TMM crash

Last Modified: Nov 05, 2025

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

Known Affected Versions:
16.0.0, 16.0.0.1, 16.0.1, 16.0.1.1, 16.0.1.2, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2, 16.1.3.3, 16.1.3.4, 16.1.3.5, 16.1.4, 16.1.4.1, 16.1.4.2, 16.1.4.3, 16.1.5, 16.1.5.1, 16.1.5.2, 16.1.6, 16.1.6.1, 17.0.0, 17.0.0.1, 17.0.0.2, 17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.1.3, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3

Fixed In:
21.0.0

Opened: Jul 30, 2025

Severity: 2-Critical

Symptoms

TMM crashes.

Impact

Traffic disrupted while tmm restarts.

Conditions

A pool member is marked down or delete while there are TCP connection issues with some pool members

Workaround

None

Fix Information

Does not core anymore, and TMM handle the situation correctly

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips