Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
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 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, 11.5.1 HF10, 11.5.1 HF11, 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 Article:
K15966
TMM cores with the TMM log showing the error 'Assertion "flow in use" failed.' This is an infrequent race condition.
Traffic disrupted while tmm restarts.
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.
Do not use FastHTTP.
The system now provides checks to mitigate the race condition on close of FastHTTP to avoid the core.