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Type: Bug
Resolution: Unresolved
Fix Version/s: None
Affects Version/s: 22w15a, 22w16b, 22w18a, 1.19 Pre-release 1, 1.19 Release Candidate 2, 1.19, 1.19.1 Pre-release 2, 1.19.1 Pre-release 3, 1.19.1 Pre-release 5, 1.19.1, 1.19.2, 22w42a, 22w43a, 22w46a, 1.19.3, 23w07a, 1.19.4, 23w16a, 23w18a, 1.20.1, 23w32a, 23w33a, 1.20.2 Pre-release 1, 1.20.2, 24w04a
Labels:
None

Confirmation Status:
Confirmed
Category:

Crash, Performance
Mojang Priority:
Very Important
Area:
Platform

The Bug:

The server sometimes freezes when attempting to locate structures or biomes that are far away.

On several occasions, when I attempted to locate a village using the "/locate" command, the server would freeze and then eventually crash. In my testing, this issue only appeared to occur with structures that are far away such as badlands mineshafts and villages of specific kinds, as I tried to reproduce this with other structures such as mansions and igloos without success.

A crash report regarding this has been attached and can be found below.

Stack Trace:

crash-2022-04-22_18.30.50-server.txt

Description: Watching Server

java.lang.Error: Watchdog
	at java.base@17.0.2/jdk.internal.misc.Unsafe.park(Native Method)
	at java.base@17.0.2/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:252)
	at awo.bq(SourceFile:152)
	at awo.c(SourceFile:142)
	at aeo.a(SourceFile:139)
	at cef.a(SourceFile:196)
	at cei.a(SourceFile:156)
	at cup.a(SourceFile:368)
	at cup.a(SourceFile:347)
	at cup.a(SourceFile:287)
	at abs.a(SourceFile:52)
	at abs.a(SourceFile:38)
	at abs$$Lambda$3680/0x0000000801395b60.run(Unknown Source)
	at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:263)
	at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:177)
	at dr.a(SourceFile:262)
	at afi.a(SourceFile:1270)
	at afi.a(SourceFile:1254)
	at afi.a(SourceFile:1237)
	at we.a(SourceFile:30)
	at we.a(SourceFile:7)
	at ry.a(SourceFile:22)
	at ry$$Lambda$5081/0x0000000801777558.run(Unknown Source)
	at aab.run(SourceFile:18)
	at awo.d(SourceFile:157)
	at aws.d(SourceFile:23)
	at net.minecraft.server.MinecraftServer.b(SourceFile:782)
	at net.minecraft.server.MinecraftServer.d(SourceFile:158)
	at awo.x(SourceFile:131)
	at net.minecraft.server.MinecraftServer.bf(SourceFile:764)
	at net.minecraft.server.MinecraftServer.x(SourceFile:758)
	at awo.bp(SourceFile:116)
	at net.minecraft.server.MinecraftServer.w(SourceFile:742)
	at net.minecraft.server.MinecraftServer.v(SourceFile:675)
	at net.minecraft.server.MinecraftServer.a(SourceFile:263)
	at net.minecraft.server.MinecraftServer$$Lambda$4253/0x000000080142d578.run(Unknown Source)
	at java.base@17.0.2/java.lang.Thread.run(Thread.java:833)

Steps to Reproduce:

Launch the latest snapshot of Minecraft and create a new world with cheats enabled.
Attempt to locate a savanna village by using the command provided below.
```
/locate structure minecraft:village_savanna
```
If the server didn't crash, teleport yourself a fair distance away from your current location and attempt to locate another village again by using the commands provided below.
```
/tp @s ~10000 ~ ~
```
```
/locate structure minecraft:village_savanna
```
Take note as to whether or not the server sometimes freezes when attempting to locate structures or biomes that are far away.

Observed Behavior:

The server freezes.

Expected Behavior:

The server would not freeze.

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crash-2022-04-18_16.18.18-server.txt
22 kB
18/Apr/22 5:36 PM
crash-2022-04-22_18.30.50-server.txt
25 kB
22/Apr/22 7:32 PM
deobf_crash-2022-04-18_16.18.18-server.txt
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18/Apr/22 5:37 PM
deobf_crash-2022-04-22_18.30.50-server.txt
52 kB
22/Apr/22 7:32 PM

is duplicated by

MC-251564 /locate minecraft:village_(biome) bugs out my minecraft

Resolved

MC-252842 /locate structure freezing nearly everything in superflat singleplayer

Resolved

MC-254224 /locate structure command crashes game

Resolved

MC-256564 game hangs on structure/biome search

Resolved

MC-257701 Using the /locate directive causes the chunk to stop loading

Resolved

MC-257805 Game lags and crashes when generating world with no structures, when using locate structure command.

Resolved

MC-261097 Woodland Mansion generation conditions are not configurable and lag /locate when not fulfilled

Resolved

MC-262028 Every blocks cannot interact after typing command /locate structure minecraft:snowy_village

Resolved

MC-264083 Mobs Freezes after I do /locate twice

Resolved

MC-264325 Loading structures when there are none causes lag

Resolved

MC-264464 Using /locate on a structure in a structureless void lags out game

Resolved

MC-264747 Leaving while /locate-ing causes your game to freeze.

Resolved

relates to

MC-206327 (Server) Using /locate in customized worlds on a structure that is very far away or doesn't exist freezes the game

Open

MC-126244 '/locate', explorer maps, and treasure maps can cause extreme TPS lag, even leading to a complete server freeze if structure generation is turned off

Resolved

MC-189880 /locate biome can cause large amounts of server lag if the specified biome is very rare or non-existant

Open

MC-249136 Freeze/server-side lag spike sometimes occurs when attempting to locate a buried treasure or opening/breaking a chest containing a map

Resolved

(7 is duplicated by, 4 relates to)

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Stack Trace:

Steps to Reproduce:

Observed Behavior:

Expected Behavior:

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