Bug ID 426328: Updating iRule procs while in use can cause a core

Last Modified: Oct 06, 2020

Bug Tracker

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

Known Affected Versions:
11.4.0, 11.4.1, 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, 11.6.0 HF5

Fixed In:
12.0.0, 11.6.0 HF6, 11.5.2, 11.4.1 HF9

Opened: Jul 26, 2013
Severity: 2-Critical
Related AskF5 Article:


When updating an iRule that is in process or parked and has existing connections and uses a proc, a core can occur due to incorrect internal reference counting.


The BIG-IP system might temporarily fail to process traffic, and fail over if configured as part of a high availability (HA) pair.


High traffic iRule that both parks and uses a proc.


Disable listener before updating iRule. For more information, see SOL14654: Updating an iRule that uses sideband connections may cause TMM to core, available here: http://support.f5.com/kb/en-us/solutions/public/14000/600/sol14654.

Fix Information

Updating an iRule that uses sideband connections no longer causes TMM to core.

Behavior Change