Bug ID 450058: CPU lockup can occur while accessing swap on SSDs on BIG-IP 5000s, 5200v, 5050, 7000s, 7200v, 7050, 10000s, and 10200v platforms, and on VIPRION B2150 and B2250 blades

Last Modified: Dec 10, 2018

Bug Tracker

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

Known Affected Versions:
11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0

Fixed In:
11.6.0, 11.5.1, 11.5.0 HF1, 11.4.1 HF4, 11.4.0 HF8, 11.3.0 HF9, 11.2.1 HF12

Opened: Feb 24, 2014
Severity: 2-Critical

Symptoms

On BIG-IP and BIG-IQ platforms provisioned with SSD swap space, there is a possible race condition that can lock up some of the CPUs, causing a disruption of service from that CPU.

Impact

Swap activity can lock up the system, requiring a power cycle or AOM host reset.

Conditions

This occurs only on BIG-IP 5000s, 5200v, 5050, 7000s, 7200v, 7050, 10000s, and 10200v platforms, and on VIPRION B2150 and B2250 blades.

Workaround

None. However, this is a rare occurrence.

Fix Information

Added changes from RHEL6.4 kernel sources prevent possible lockup conditions by yielding to other tasks waiting for the swap I/O requests to complete.

Behavior Change