Bug ID 465607: TMM cores with TMM log error 'Assertion "flow in use" failed.' when isuing FastHTTP.

Last Modified: Apr 10, 2019

Bug Tracker

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

Known Affected Versions:
11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5

Fixed In:
12.0.0, 11.6.0 HF6, 11.5.2, 11.4.1 HF9

Opened: Jun 04, 2014
Severity: 3-Major
Related AskF5 Article:
K15966

Symptoms

TMM cores with the TMM log showing the error 'Assertion "flow in use" failed.' This is an infrequent race condition.

Impact

Traffic disrupted while tmm restarts.

Conditions

This is an infrequent race condition. The actual set of events that leads to this core is unknown. However, this requires FastHTTP to be configured, and it is known that this happens when the FastHTTP connection is closing.

Workaround

Do not use FastHTTP.

Fix Information

The system now provides checks to mitigate the race condition on close of FastHTTP to avoid the core.

Behavior Change