A player on my server was flying and the server kicked him for floating too long,. which is normal. However it issued multiple kicks to the same player. Not sure if this is a Ubuntu issue, a java issue or if this is Minecraft. Figured i would upload it anyways since I haven't seen this kind of thing before.
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Quite normal with hacked clients (e.g. FlyMod). Look at the timestamps, that has happened all in the same second.
This is still a bug in the latest version and it has been a bug for a very long time. When the server thinks that a player is flying, the following is logged to the console:
[Disconnect] User PLAYER has disconnected, reason: Flying is not enabled on this server
[Server] INFO [Player] PLAYER left the game
[Server] WARN PLAYER was kicked for floating too long!
The bug is that the "was kicked for floating too long" message is logged hundreds of times all at once in response to a single kick event (it was logged 382 times in response to a single kick event on my server today), which floods the console with the same message over using up lots of disk space over time and is also very annoying. This may also cause a lag spike on the server, as others have reported.
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.