On Tue, 2021-01-05 at 13:35 -0800, Hugh Dickins wrote:

This patchset went into mmotm 2020-11-16-16-23, so probably linux-next
on 2020-11-17: you'll have had three trouble-free weeks testing with it
in, so it's not a likely suspect.  I haven't looked yet at your report,
to think of a more likely suspect: will do.

Probably my memory was bad then. Unfortunately, I had 2 weeks holidays before
the Thanksgiving as well. I have tried a few times so far and only been able to
reproduce once. Looks nasty...