Bug ID 479171: TMM might crash when DSACK is enabled

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
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, 11.5.10, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
12.0.0, 11.6.0 HF5, 11.5.2

Opened: Sep 12, 2014
Severity: 2-Critical
Related Article:


TMM might crash when DSACK is enabled


Traffic disrupted while tmm restarts.


This occurs rarely on a virtual server configured with a TCP profile that has DSACK (Duplicate Selective Acknowledgement) enabled.


Do not use TCP profile with the DSACK feature enabled.

Fix Information

TMM no longer attempts to transmit DSACKs after reassembly queue has been purged, so no TMM crash occurs.

Behavior Change