On a system with skip-external-locking = ON, why would I ever see a thread state of "System lock" on a MyISAM table? This documentation:

https://mariadb.com/kb/en/library/general-thread-states/

suggests that "... MyISAM storage engine uses file-based locks. However, MyISAM's external locks are disabled by default ...", which makes me think I shouldn't see them. Last night at one point I had several threads stacked up in "System lock" status and trying to get to the bottom of it.

It's 10.3.14, if it makes a difference.

Thanks,

Dan