Bug ID 435022: TMM might crash if an ICMP packet refers to a closed UDP connection

Last Modified: Apr 10, 2019

Bug Tracker

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

Known Affected Versions:
11.2.0, 11.2.1, 11.3.0

Opened: Oct 23, 2013
Severity: 3-Major
Related AskF5 Article:
K15826

Symptoms

TMM might crash if an ICMP packet refers to a closed UDP connection.

Impact

Traffic disrupted while tmm restarts.

Conditions

- A virtual server with UDP profile. This is more likely to occur if the UDP profile 'Datagram LB' option is enabled and/or if the UDP profile timeout is 0 or 'immediate'. - An ICMP packet (such as destination-unreachable) arrives matching the IP and port tuple of an old UDP connection just after a new UDP packet arrives from a client with the same tuple for a new connection.

Workaround

If the UDP profile timeout is set to 0 or 'immediate', consider increasing this value.

Fix Information

None

Behavior Change