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CONTAP-777838: ONTAP node disruption after BSD wired memory grows with fix for CONTAP-520139

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Issue

An ONTAP node may experience a disruption after a userspace process such as mgwd, secd, or bcomd remains unresponsive and cannot recover:
PANIC: Process <process_name> unresponsive for <seconds> seconds ... in process nodewatchdog

A generic node watchdog signature is not sufficient to match this issue. The disruption event must also have the FreeBSD memory-exhaustion signature:

  • FreeBSD wired memory consumes nearly all of the BSD memory partition.
    All known field hits show approximately 94% or more wired memory.
  • Available BSD memory is reduced to a few hundred MB or less.
  • Systemshell top -bS output shows high Wired and little free memory usage.

Systemshell access requires diagnostic privilege. Use systemshell commnd only with NetApp Support guidance to determine current MHOST memory usage using the top command, example:
cluster::> set -privilege diagnostic
cluster::*> systemshell -node <node_name> -command "top -bS | head -n 5"
last pid: 78952; load averages: 29.70, 28.44, 26.02 up 138+18:44:26
3339 processes:72 running, 282 sleeping, 2 zombie, 2983 waiting
CPU: 2.3% user, 0.0% nice, 36.9% system, 0.1% interrupt, 60.7% idle
Mem: 62M Active, 1132K Inact, 3532K Laundry, 15G Wired, 905M Buf, 253M Free
Swap: 8192M Total, 1400M Used, 6792M Free, 17% Inuse

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