Bug ID 537034: PEM: CPU spike seen when iRule tries to update nonexistent sessions.

Last Modified: Sep 13, 2023

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

Known Affected Versions:
11.5.1 HF1, 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, 11.5.1 HF10, 11.5.1 HF11, 11.5.2 HF1, 11.5.3 HF1, 11.5.3 HF2, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 12.0.0, 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:
12.1.0, 12.0.0 HF1, 11.6.0 HF6

Opened: Aug 01, 2015

Severity: 3-Major

Related Article: K13145204

Symptoms

CPU spikes and remains high, eventually leading to TMM core.

Impact

CPU spike. Traffic disrupted while tmm restarts.

Conditions

iRule is used to update a session with policies for a session that does not exist.

Workaround

Make sure the session exists if you plan to use iRules to update sessions with policies.

Fix Information

CPU spike are no longer seen, even if iRule tries to update nonexistent sessions.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips