Bug ID 508053: TMM crashes with Assertion 'flow not in use' log message

Last Modified: Mar 17, 2021

Bug Tracker

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

Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3,,,,, 11.6.4, 11.6.5,,,

Fixed In:

Opened: Feb 19, 2015
Severity: 2-Critical
Related AskF5 Article:


TMM crashes with an assertion 'flow not in use' log message. This issue is more prominent when traffic selector narrowing occurs during IPsec/IKE negotiations.


TMM does not removes a flow properly. TMM crashes. The tmm log contains a message similar to the following: notice panic: ../base/flow_table.c:598: Assertion 'flow not in use' failed. Traffic disrupted while tmm restarts.


During traffic selector narrowing, the narrowed selector policies are added and deleted multiple times for the same parent ipsec policy. During this process, improper release of flows by TMM causes this issue.


There is no workaround at this time.

Fix Information

TMM now releases the flow properly and TMM does not crash.

Behavior Change