Bug ID 771493: When CPU at max, logs might be missing

Last Modified: Jan 06, 2023

Bug Tracker

Affected Product:  See more info
BIG-IP APM(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, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1

Opened: Apr 10, 2019
Severity: 3-Major

Symptoms

Under stress, when CPU goes to Max, some logs might be missing in debug mode.

Impact

Logging might not be not reliable; some logs might be missing. This occurs because logging is a lower priority task on the system.

Conditions

-- Logging is configured for debug mode. -- System is under stress. -- CPU is at max.

Workaround

Do not turn on debug mode, which can produce a large number of logs containing a large number of debug messages. Run the system at normal load usually max at 95% CPU, so leave CPU room for logging.

Fix Information

None

Behavior Change