I've taken a 1.12.2 world and tried to start it up under 1.13.pre6.
It starts ok, and runs hot (300%+ CPU) for 2 minutes, eventually outputting
[19:30:01] [Server thread/INFO]: Preparing spawn area: 100%
[19:30:01] [Server thread/INFO]: Time elapsed: 125724 ms
[19:30:01] [Server thread/INFO]: Done (126.673s)! For help, type "help"
But when I login, it spikes back up to 350% CPU, and takes a while to show terrain. I didn't move, just sat and waited for the CPU to drop back off, but eventually it crashed.
I ran the same world under pre5, and I could login and move around without a crash (suffered from TPS issues, but not this)
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Relates to MC-132375.
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Dunno, pre5 was fine.
Well.. it suffered from no iron golems and a slow TPS, but I could login and move around, CPU stayed at 50-10% and didn't crash.
I think this is new.
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The behaviour in pre7 is a bit different. It still takes 2minutes to go from
[12:18:51] [Server thread/INFO]: Preparing start region for level 0
[12:20:52] [Server thread/INFO]: Preparing spawn area: 0%
but the CPU rans less intensively.
I was able to login but it was very slow in areas where chunks already existed, and eventually crashed. I started the server again, and logged in and it crashed immediately. I got a fresh copy of the world and tried again - I was able to go to the same location (walking instead of flying) and move around without a crash, but after visiting other 1.12.2 generated chunks, it crashed again.
I restarted the server, got another player to login at a different location and it crashed also.
I'll attach various crash logs from today (pre7)
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The first crash seems to be an issue with the WorldGen pool? And then maybe its in a weird state and crashes?
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pre8 - same behaviour except it took longer to get it to crash. I had to fly around fast in creative in known complicated areas.
Once its crashed once, you cannot login again, because the server times out.
[22:33:56] [Server Watchdog/FATAL]: A single server tick took 60.82 seconds (should be max 0.05)
[22:33:56] [Server Watchdog/FATAL]: Considering it to be crashed, server will forcibly shutdown.
But I fiddled server properties and set the
max-tick-time=600000
to see what might happen.
[22:41:17] [Server thread/ERROR]: Something went wrong upgrading!
java.lang.OutOfMemoryError: Java heap space
at hd.c(SourceFile:50) ~[minecraft_server.pre8.jar:?]
at hd.b(SourceFile:10) ~[minecraft_server.pre8.jar:?]
at gy.f(SourceFile:395) ~[minecraft_server.pre8.jar:?]
at gy.b(SourceFile:28) ~[minecraft_server.pre8.jar:?]
at he.c(SourceFile:271) ~[minecraft_server.pre8.jar:?]
at he.b(SourceFile:17) ~[minecraft_server.pre8.jar:?]
at gy.f(SourceFile:395) ~[minecraft_server.pre8.jar:?]
at gy.b(SourceFile:28) ~[minecraft_server.pre8.jar:?]
at hj.a(SourceFile:160) ~[minecraft_server.pre8.jar:?]
at hj.mergeInto(SourceFile:22) ~[minecraft_server.pre8.jar:?]
at com.mojang.datafixers.types.DynamicOps.set(DynamicOps.java:162) ~[minecraft_server.pre8.jar:?]
at com.mojang.datafixers.types.DynamicOps.lambda$update$11(DynamicOps.java:166) ~[minecraft_server.pre8.jar:?]
at com.mojang.datafixers.types.DynamicOps$$Lambda$1638/1344684320.apply(Unknown Source) ~[?:?]
at java.util.Optional.map(Optional.java:215) ~[?:1.8.0_171]
at com.mojang.datafixers.types.DynamicOps.update(DynamicOps.java:166) ~[minecraft_server.pre8.jar:?]
at com.mojang.datafixers.Dynamic.lambda$update$12(Dynamic.java:151) ~[minecraft_server.pre8.jar:?]
at com.mojang.datafixers.Dynamic$$Lambda$1636/1157730944.apply(Unknown Source) ~[?:?]
at com.mojang.datafixers.Dynamic.map(Dynamic.java:42) ~[minecraft_server.pre8.jar:?]
at com.mojang.datafixers.Dynamic.update(Dynamic.java:151) ~[minecraft_server.pre8.jar:?]
at zu.a(SourceFile:29) ~[minecraft_server.pre8.jar:?]
at zu$$Lambda$547/621337084.apply(Unknown Source) ~[?:?]
at com.mojang.datafixers.DataFix.lambda$null$2(DataFix.java:42) ~[minecraft_server.pre8.jar:?]
at com.mojang.datafixers.DataFix$$Lambda$1468/1907584040.apply(Unknown Source) ~[?:?]
at com.mojang.datafixers.FunctionType$$Lambda$1450/1016980185.apply(Unknown Source) ~[?:?]
at com.mojang.datafixers.FunctionType$Instance.lambda$first$2(FunctionType.java:84) ~[minecraft_server.pre8.jar:?]
at com.mojang.datafixers.FunctionType$Instance$$Lambda$1457/369384969.apply(Unknown Source) ~[?:?]
at com.mojang.datafixers.FunctionType$$Lambda$1450/1016980185.apply(Unknown Source) ~[?:?]
at com.mojang.datafixers.FunctionType$Instance.lambda$null$0(FunctionType.java:76) ~[minecraft_server.pre8.jar:?]
at com.mojang.datafixers.FunctionType$Instance$$Lambda$1456/1517960227.apply(Unknown Source) ~[?:?]
at com.mojang.datafixers.FunctionType$$Lambda$1450/1016980185.apply(Unknown Source) ~[?:?]
at com.mojang.datafixers.FunctionType$Instance.lambda$null$4(FunctionType.java:96) ~[minecraft_server.pre8.jar:?]
at com.mojang.datafixers.FunctionType$Instance$$Lambda$1510/1881320200.apply(Unknown Source) ~[?:?]
[22:41:29] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 315280ms or 6305 ticks behind
but it didn't crash. I have now logged in and can interact with the game. Until the next time this happens. I don't really want to leave the server with such a huge max tick time.
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Flew around fast over built up areas.
[08:19:30] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 18355ms or 367 ticks behind
[08:19:51] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 5929ms or 118 ticks behind
[08:21:26] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 80632ms or 1612 ticks behind
[08:21:45] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 4187ms or 83 ticks behind
[08:22:36] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 35475ms or 709 ticks behind
[08:23:38] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 46850ms or 937 ticks behind
[08:24:05] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2051ms or 41 ticks behind
[08:24:22] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2057ms or 41 ticks behind
[08:25:11] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2069ms or 41 ticks behind
[08:26:05] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2067ms or 41 ticks behind
[08:27:04] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 44276ms or 885 ticks behind
but it didn't crash.
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getting better, but it'd still have crashed if i hadn't upped the max ticks:
[16:43:48] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 19581ms or 391 ticks behind
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pre10 still needs the max ticks set stupid high:
[08:56:44] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 20518ms or 410 ticks behind
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functionally seems to be the same as:
https://bugs.mojang.com/browse/MC-132135
wobst.michael
Does it still crash in 1.13.1?