This now has happened several times in the 1.13 pre6 release. Every time you repeatedly trade paper for emeralds with a cartographer villager, the server will eventually give a time-out, and all players will be disconnected. The server itself does not crash, and no stacktraces can be found in the server log. It does say this though:
[23:44:07] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 39074ms or 781 ticks behind.
That message only appears in the logs when this timeout happens.
MC-132935
Trading paper for emerald with a cartographer villager causes timeout on server, and all players get disconnected.
Resolved
Duplicate
0
Rene di Giovanni
(Unassigned)
Unconfirmed
Minecraft 1.13-pre6
Retrieved
This bug can be reproduced consistently. Set up a few cartographer villagers, keep trading paper for emerald so they will unlock new levels of trade, and eventually this will happen:
[11:46:32] [Server thread/INFO]: Xena_Dragon lost connection: Disconnected
[11:46:32] [Server thread/INFO]: Xena_Dragon left the game
[11:46:32] [Server thread/INFO]: Dongersmooi lost connection: Disconnected
[11:46:32] [Server thread/INFO]: Dongersmooi left the game
[11:46:32] [Server thread/INFO]: Joene lost connection: Disconnected
[11:46:32] [Server thread/INFO]: Joene left the game
[11:46:32] [Server thread/INFO]: Nomicor lost connection: Disconnected
[11:46:32] [Server thread/INFO]: Nomicor left the game
[11:46:32] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 35350ms or 707 ticks behind