Bug ID 1069113: ASM process watchdog should be less aggressive

Last Modified: Nov 07, 2022

Bug Tracker

Affected Product:  See more info
BIG-IP ASM(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, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 13.1.3.4, 13.1.3.5, 13.1.3.6, 13.1.4, 13.1.4.1, 13.1.5, 13.1.5.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 14.1.2.5, 14.1.2.6, 14.1.2.7, 14.1.2.8, 14.1.3, 14.1.3.1, 14.1.4, 14.1.4.1, 14.1.4.2, 14.1.4.3, 14.1.4.4, 14.1.4.5, 14.1.4.6, 14.1.5, 14.1.5.1, 14.1.5.2, 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, 16.1.0, 16.1.1, 16.1.2, 16.1.2.1, 16.1.2.2, 16.1.3, 16.1.3.1, 16.1.3.2

Opened: Dec 20, 2021
Severity: 3-Major

Symptoms

During standard operation a process is expected to exit and be restarted once it has exceeded a certain memory limit. As a failsafe, the watchdog forcefully kills the process if it exceeds a higher threshold. But if the handler was running close to the memory limit before a resource-intensive event like a full sync load, this operation could push it over both limits.

Impact

A process may be killed in the middle of a data-integrity sensitive action, like a device-group sync, which can leave the system in a corrupt state.

Conditions

An ASMConfig handler is running close to the memory limit before a resource intensive event, like a full sync load.

Workaround

Modify the memory limits in nwd.cfg to raise it by 100 MB. To load the configuration change, restart the asm_config_server process. Impact of workaround: Performing the following procedure should not have a negative impact on your system: 1. Log in to the BIG-IP system command line. 2. To restart the asm_config_server process, type the following command: "pkill -f asm_config_server" Note : Restarting the asm_config_server process does not disrupt traffic processing. The BIG-IP ASM watchdog process automatically restarts the asm_config_server process within 10 to 15 seconds.

Fix Information

None

Behavior Change