It started working again at 03:13 UTC. I got the error first at 19:13 UTC, so the lock lasted for ~ 8 hours or more. It is possible to configure such a look, whatever caused it, to timeout faster?

Do you know which specific servers were hit (like "mw1234")?

Only know the IP I included in my first message, 10.64.16.13, which seems to be db1024.

Unsure whether to put this API or DB or Page editing territory, meh.

Looking at https://fi.wikipedia.org/w/index.php?title=Wikipedia:Viikon_kilpailu/Viikon_kilpailu_2014-35&action=history I assume this is about UKBot?

(In reply to Dan Michael Heggø from comment #1)

It started working again at 03:13 UTC.

Wondering if the diff size (+40499) comes into play here...

Also see bug 37519 comment 13.

It's about UKBot, yes. However, once the page was locked, noone else could edit it either. What puzzles me the most is that the lock lasted for so many hours.

(In reply to Andre Klapper from comment #4)

Unsure whether to put this API or DB or Page editing territory, meh.

Not API, the API just calls into the core page editing code. The error itself was coming from the database layer, although the base cause for the lock wait timeout might be elsewhere (e.g. something else holding a lock for far too long).

I removed "via bot" from the bug title since comment 0 implies that the same error was received when editing via the UI.

(In reply to Brad Jorsch from comment #6)

The error itself was coming from the database layer, although the base
cause for the lock wait timeout might be elsewhere (e.g. something else
holding a lock for far too long).

Thanks.

Might be hard to track down now that the problem is gone. :-/