Bug ID 530761: TMM crash in DNS processing on a TCP virtual

Last Modified: May 29, 2024

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

Known Affected Versions:
11.5.3, 11.6.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2

Fixed In:
12.0.0, 11.6.1, 11.5.4

Opened: Jun 30, 2015

Severity: 3-Major


TMM can crash while processing DNS requests on a TCP virtual server.


Traffic disrupted while tmm restarts.


A TCP DNS virtual server combined with a DNS iRule that suspends and a client that closes its connection before receiving a response to its DNS request.


While no true workaround exists, the situation can be avoiding by removing any one of the conditions above.

Fix Information

TMM now properly handles DNS requests through a TCP virtual where the client closes the connection during iRule processing.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips