From The Free On-line Dictionary of Computing (19 January 2023):
snark
[Lewis Carroll, via the Michigan Terminal System] 1. A system
failure. When a user's process bombed, the operator would get
the message "Help, Help, Snark in MTS!"
2. More generally, any kind of unexplained or threatening
event on a computer (especially if it might be a boojum).
Often used to refer to an event or a log file entry that might
indicate an attempted security violation. See snivitz.
3. UUCP name of snark.thyrsus.com, home site of the Hacker
Jargon File versions 2.*.*.