Bug ID 881401: TMM crash at Tcl_AfterCancelByUF() while deleting connections.

Last Modified: Apr 15, 2022

Bug Tracker

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

Known Affected Versions:
15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5

Fixed In:
16.0.0, 15.1.5.1

Opened: Feb 15, 2020
Severity: 2-Critical

Symptoms

TMM crashed while deleting connections.

Impact

Traffic is disrupted while TMM restarts.

Conditions

1.There are a high volume of connections remaining (those connections born from a virtual server which has iRule with "after XXX -periodic" iRule command) and connections are deleted. 2. A huge number of DNS requests are sent from the same source IP/port to a datagram_LB enabled UDP listener, which results in a huge number of flows in the same bucket and connections are deleted.

Workaround

N/A

Fix Information

N/A

Behavior Change