Deadlock on joining server

[Xenoxis]

Client version: 1.12.2
Server OS: Ubuntu server 16.04 i386
Cuberite Commit id: aac592f

Deadlock when i tried to join, the motd was displayed, but chunks wasn't able to load, and then the server has crashed.

Server log

[10:32:08] Deadlock detected: world world has been stuck at age 2798912. Aborting the server.
[10:32:08] CS at 0xb60ff41c, World world clients: RecursionCount = 0, ThreadIDHash = 3e25526c
[10:32:08] CS at 0xb59ae148, World world players: RecursionCount = 0, ThreadIDHash = 3e25526c
[10:32:08] CS at 0xb60ff3f0, World world tasks: RecursionCount = 0, ThreadIDHash = 3e25526c
[10:32:08] CS at 0xb8308b8, World world chunkmap: RecursionCount = 1, ThreadIDHash = 3e25526c
[10:32:08] CS at 0xb51a841c, World world_nether clients: RecursionCount = 0, ThreadIDHash = 4ef59e6e
[10:32:08] CS at 0xb4a57148, World world_nether players: RecursionCount = 0, ThreadIDHash = 4ef59e6e
[10:32:08] CS at 0xb51a83f0, World world_nether tasks: RecursionCount = 0, ThreadIDHash = 4ef59e6e
[10:32:08] CS at 0xcb81f40, World world_nether chunkmap: RecursionCount = 0, ThreadIDHash = 4ef59e6e
[10:32:08] CS at 0xb425141c, World world_the_end clients: RecursionCount = 0, ThreadIDHash = 5e0a3c39
[10:32:08] CS at 0xb3b00148, World world_the_end players: RecursionCount = 0, ThreadIDHash = 5e0a3c39
[10:32:08] CS at 0xb42513f0, World world_the_end tasks: RecursionCount = 0, ThreadIDHash = 5e0a3c39
[10:32:08] CS at 0xcb71010, World world_the_end chunkmap: RecursionCount = 0, ThreadIDHash = 5e0a3c39
[10:32:08] CS at 0xcb0bb90, cLuaState plugin ProtectionAreas: RecursionCount = 0, ThreadIDHash = d7d144e8
[10:32:08] CS at 0xcb45c88, cLuaState plugin AutoSave: RecursionCount = 0, ThreadIDHash = d7d144e8
[10:32:08] CS at 0xcb45d90, cLuaState plugin DumpInfo: RecursionCount = 0, ThreadIDHash = 26b5ac16
[10:32:08] CS at 0xcb2bfa0, cLuaState plugin Core: RecursionCount = 0, ThreadIDHash = d7d144e8
[10:32:08] CS at 0xcb2c0a8, cLuaState plugin Essentials-master: RecursionCount = 0, ThreadIDHash = 5e0a3c39
[10:32:08] CS at 0xcb0bd90, cLuaState plugin Animal+: RecursionCount = 0, ThreadIDHash = 26b5ac16
[10:32:08] CS at 0xcb2c1d8, cLuaState plugin TestLuaRocks: RecursionCount = 0, ThreadIDHash = 26b5ac16
[10:32:08] CS at 0xcb2c2e0, cLuaState plugin APIDump: RecursionCount = 0, ThreadIDHash = 26b5ac16
[10:32:08] CS at 0xb830390, cLuaState plugin Loggin: RecursionCount = 0, ThreadIDHash = d7d144e8
[10:32:08] CS at 0xb830520, cLuaState plugin ChatLog: RecursionCount = 0, ThreadIDHash = 885a18e7
[10:32:08] CS at 0xb830628, cLuaState plugin NetworkTest: RecursionCount = 0, ThreadIDHash = 26b5ac16
[10:32:08] CS at 0xcb7bd90, cLuaState plugin HookNotify: RecursionCount = 0, ThreadIDHash = 26b5ac16
[10:32:08] CS at 0xcb7be98, cLuaState plugin Debuggers: RecursionCount = 0, ThreadIDHash = 26b5ac16
[10:32:08]   D:    | Cuberite has encountered an error and needs to close
[10:32:08] Details | SIGABRT: Server self-terminated due to an internal fault
[10:32:08] Cuberite local build build id: Unknown
[10:32:08] from commit id: approx: aac592f98598aae327d07b2a1bb155e33c6d51b1 built at: approx: 2020-04-03 22:23:38 +0100
./Cuberite(_Z15PrintStackTracev+0x22)[0x82a7e22]
./Cuberite[0x8295008]
[0xb7742bb4]
[0xb7742bd1]
/lib/i386-linux-gnu/libc.so.6(gsignal+0x39)[0xb732cea9]
/lib/i386-linux-gnu/libc.so.6(abort+0x157)[0xb732e407]
./Cuberite[0x82084d2]
./Cuberite[0x8208eda]
./Cuberite[0x8208f11]
./Cuberite(_ZN5cRoot12ForEachWorldE12cFunctionRefIFbR6cWorldEE+0x2e)[0x825439e]
./Cuberite(_ZN15cDeadlockDetect7ExecuteEv+0x46)[0x8208026]
/usr/lib/i386-linux-gnu/libstdc++.so.6(+0xb4a7d)[0xb75fba7d]
/lib/i386-linux-gnu/libpthread.so.0(+0x6295)[0xb74be295]
/lib/i386-linux-gnu/libc.so.6(clone+0x6e)[0xb73e80ae]
Abandon (core dumped)

[tigerw]

Looks similar to #4491.