Bug ID 712919: Removing an iRule from a Virtual Server may prevent executing other iRules on the same Virtual Server.

Last Modified: Oct 30, 2019

Bug Tracker

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

Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.4, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1

Fixed In:
15.0.0, 14.0.1.1, 13.1.3

Opened: Mar 30, 2018
Severity: 3-Major

Symptoms

When an iRule is removed from a Virtual Server, especially one with explicitly specified high priority (with "priority" keyword), other iRules on the same Virtual Server may become "invisible" i.e. they are present but some of them are no longer executed. It may affect all the events or only certain types of them. Under certain conditions the defect may even disappear upon removing another iRule, particularly if it has low priority and handles the same event as the one which introduced the problem.

Impact

Some or all iRules on given Virtual Servers stop being executed.

Conditions

Removing an iRule from a Virtual Server.

Workaround

Restart or reload the configuration. If removing iRules needs to be performed in run-time and it triggers the problem, it can be prevented by having any iRule (even an empty one) for the same event, as the iRule which is going to be removed, but with higher priority e.g. with attribute "priority 1".

Fix Information

Corrected scanning of iRules stored behind the one which is being deleted.

Behavior Change