MC-158466Server Crash (Exception ticking world: ConcurrentModificationException)
Description: Exception while ticking java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) at java.util.HashMap$KeyIterator.next(HashMap.java:1453) at yw.a(SourceFile:983) at bpa.a(SourceFile:281) at bpa.a(SourceFile:351) at bwr.d(SourceFile:105) at bxe.a(SourceFile:49) at cei$a.a(SourceFile:856) at yw.b(SourceFile:609) at yw$$Lambda$3827/659711812.accept(Unknown Source) at bpn.b(SourceFile:84) at yw.a(SourceFile:351) at net.minecraft.server.MinecraftServer.b(SourceFile:893) at net.minecraft.server.MinecraftServer.a(SourceFile:832) at enr.a(SourceFile:89) at net.minecraft.server.MinecraftServer.run(SourceFile:691) at java.lang.Thread.run(Thread.java:745)
Linked Issues
Attachments10
![[Helper] Misode](../../../data/avatars/users/93314.png){kind=small}
Very ImportantCreated Issue:
Server Crash
Windows 10
Java 8
Environment
[19:30:13] [Server thread/ERROR]: Encountered an unexpected exception
m: Exception ticking world
at net.minecraft.server.MinecraftServer.b(SourceFile:839) ~[1.14.4.jar:?]
at uk.b(SourceFile:343) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.a(SourceFile:774) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:642) [1.14.4.jar:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51]
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) ~[?:1.8.0_51]
at java.util.HashMap$KeyIterator.next(HashMap.java:1453) ~[?:1.8.0_51]
at vk.a(SourceFile:1037) ~[1.14.4.jar:?]
at bhr.a(SourceFile:233) ~[1.14.4.jar:?]
at bmc.a(SourceFile:217) ~[1.14.4.jar:?]
at bmc.b(SourceFile:124) ~[1.14.4.jar:?]
at bmv.c(SourceFile:545) ~[1.14.4.jar:?]
at bvt.b(SourceFile:269) ~[1.14.4.jar:?]
at vk.a(SourceFile:466) ~[1.14.4.jar:?]
at vi.a(SourceFile:405) ~[1.14.4.jar:?]
at vi$$Lambda$2460/365644605.accept(Unknown Source) ~[?:?]
at it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap$1.forEach(Long2ObjectLinkedOpenHashMap.java:1661) ~[1.14.4.jar:?]
at com.google.common.collect.Iterables$UnmodifiableIterable.forEach(Iterables.java:105) ~[1.14.4.jar:?]
at vi.o(SourceFile:366) ~[1.14.4.jar:?]
at vi.a(SourceFile:335) ~[1.14.4.jar:?]
at vk.a(SourceFile:316) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.b(SourceFile:835) ~[1.14.4.jar:?]
... 4 more
![[Mod] Asteraoth](../../../data/avatars/users/92886.png){kind=small}
NormalWindows 10
Java 8
[19:30:13] [Server thread/ERROR]: Encountered an unexpected exception
m: Exception ticking world
at net.minecraft.server.MinecraftServer.b(SourceFile:839) ~[1.14.4.jar:?]
at uk.b(SourceFile:343) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.a(SourceFile:774) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:642) [1.14.4.jar:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51]
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) ~[?:1.8.0_51]
at java.util.HashMap$KeyIterator.next(HashMap.java:1453) ~[?:1.8.0_51]
at vk.a(SourceFile:1037) ~[1.14.4.jar:?]
at bhr.a(SourceFile:233) ~[1.14.4.jar:?]
at bmc.a(SourceFile:217) ~[1.14.4.jar:?]
at bmc.b(SourceFile:124) ~[1.14.4.jar:?]
at bmv.c(SourceFile:545) ~[1.14.4.jar:?]
at bvt.b(SourceFile:269) ~[1.14.4.jar:?]
at vk.a(SourceFile:466) ~[1.14.4.jar:?]
at vi.a(SourceFile:405) ~[1.14.4.jar:?]
at vi$$Lambda$2460/365644605.accept(Unknown Source) ~[?:?]
at it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap$1.forEach(Long2ObjectLinkedOpenHashMap.java:1661) ~[1.14.4.jar:?]
at com.google.common.collect.Iterables$UnmodifiableIterable.forEach(Iterables.java:105) ~[1.14.4.jar:?]
at vi.o(SourceFile:366) ~[1.14.4.jar:?]
at vi.a(SourceFile:335) ~[1.14.4.jar:?]
at vk.a(SourceFile:316) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.b(SourceFile:835) ~[1.14.4.jar:?]
... 4 more
[19:30:13] [Server thread/ERROR]: Encountered an unexpected exception
m: Exception ticking world
at net.minecraft.server.MinecraftServer.b(SourceFile:839) ~[1.14.4.jar:?]
at uk.b(SourceFile:343) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.a(SourceFile:774) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:642) [1.14.4.jar:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51]
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) ~[?:1.8.0_51]
at java.util.HashMap$KeyIterator.next(HashMap.java:1453) ~[?:1.8.0_51]
at vk.a(SourceFile:1037) ~[1.14.4.jar:?]
at bhr.a(SourceFile:233) ~[1.14.4.jar:?]
at bmc.a(SourceFile:217) ~[1.14.4.jar:?]
at bmc.b(SourceFile:124) ~[1.14.4.jar:?]
at bmv.c(SourceFile:545) ~[1.14.4.jar:?]
at bvt.b(SourceFile:269) ~[1.14.4.jar:?]
at vk.a(SourceFile:466) ~[1.14.4.jar:?]
at vi.a(SourceFile:405) ~[1.14.4.jar:?]
at vi$$Lambda$2460/365644605.accept(Unknown Source) ~[?:?]
at it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap$1.forEach(Long2ObjectLinkedOpenHashMap.java:1661) ~[1.14.4.jar:?]
at com.google.common.collect.Iterables$UnmodifiableIterable.forEach(Iterables.java:105) ~[1.14.4.jar:?]
at vi.o(SourceFile:366) ~[1.14.4.jar:?]
at vi.a(SourceFile:335) ~[1.14.4.jar:?]
at vk.a(SourceFile:316) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.b(SourceFile:835) ~[1.14.4.jar:?]
... 4 more
Windows 10
Java 8
Minecraft.exe
![[Bot] Arisa](../../../data/assets/gravatar/mustek2.png){kind=small}
![[Mod] violine1101](../../../data/avatars/users/92858.png){kind=small}
Windows 10
Java 8
[19:30:13] [Server thread/ERROR]: Encountered an unexpected exception
m: Exception ticking world
at net.minecraft.server.MinecraftServer.b(SourceFile:839) ~[1.14.4.jar:?]
at uk.b(SourceFile:343) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.a(SourceFile:774) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:642) [1.14.4.jar:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51]
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) ~[?:1.8.0_51]
at java.util.HashMap$KeyIterator.next(HashMap.java:1453) ~[?:1.8.0_51]
at vk.a(SourceFile:1037) ~[1.14.4.jar:?]
at bhr.a(SourceFile:233) ~[1.14.4.jar:?]
at bmc.a(SourceFile:217) ~[1.14.4.jar:?]
at bmc.b(SourceFile:124) ~[1.14.4.jar:?]
at bmv.c(SourceFile:545) ~[1.14.4.jar:?]
at bvt.b(SourceFile:269) ~[1.14.4.jar:?]
at vk.a(SourceFile:466) ~[1.14.4.jar:?]
at vi.a(SourceFile:405) ~[1.14.4.jar:?]
at vi$$Lambda$2460/365644605.accept(Unknown Source) ~[?:?]
at it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap$1.forEach(Long2ObjectLinkedOpenHashMap.java:1661) ~[1.14.4.jar:?]
at com.google.common.collect.Iterables$UnmodifiableIterable.forEach(Iterables.java:105) ~[1.14.4.jar:?]
at vi.o(SourceFile:366) ~[1.14.4.jar:?]
at vi.a(SourceFile:335) ~[1.14.4.jar:?]
at vk.a(SourceFile:316) ~[1.14.4.jar:?]
at net.minecraft.server.MinecraftServer.b(SourceFile:835) ~[1.14.4.jar:?]
... 4 more
[19:30:13] [Server thread/ERROR]: Encountered an unexpected exception m: Exception ticking world at net.minecraft.server.MinecraftServer.b(SourceFile:839) ~[1.14.4.jar:?] at uk.b(SourceFile:343) ~[1.14.4.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:774) ~[1.14.4.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:642) [1.14.4.jar:?] at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51] Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) ~[?:1.8.0_51] at java.util.HashMap$KeyIterator.next(HashMap.java:1453) ~[?:1.8.0_51] at vk.a(SourceFile:1037) ~[1.14.4.jar:?] at bhr.a(SourceFile:233) ~[1.14.4.jar:?] at bmc.a(SourceFile:217) ~[1.14.4.jar:?] at bmc.b(SourceFile:124) ~[1.14.4.jar:?] at bmv.c(SourceFile:545) ~[1.14.4.jar:?] at bvt.b(SourceFile:269) ~[1.14.4.jar:?] at vk.a(SourceFile:466) ~[1.14.4.jar:?] at vi.a(SourceFile:405) ~[1.14.4.jar:?] at vi$$Lambda$2460/365644605.accept(Unknown Source) ~[?:?] at it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap$1.forEach(Long2ObjectLinkedOpenHashMap.java:1661) ~[1.14.4.jar:?] at com.google.common.collect.Iterables$UnmodifiableIterable.forEach(Iterables.java:105) ~[1.14.4.jar:?] at vi.o(SourceFile:366) ~[1.14.4.jar:?] at vi.a(SourceFile:335) ~[1.14.4.jar:?] at vk.a(SourceFile:316) ~[1.14.4.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:835) ~[1.14.4.jar:?] ... 4 more
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
![[Bot] Arisa](../../../data/avatars/users/43007.png){kind=small}
Server CrashServer Crash (Exception ticking workd: ConcurrentModificationException)
[19:30:13] [Server thread/ERROR]: Encountered an unexpected exception m: Exception ticking world at net.minecraft.server.MinecraftServer.b(SourceFile:839) ~[1.14.4.jar:?] at uk.b(SourceFile:343) ~[1.14.4.jar:?]at net.minecraft.server.MinecraftServer.a(SourceFile:774) ~[1.14.4.jar:?]at net.minecraft.server.MinecraftServer.run(SourceFile:642) [1.14.4.jar:?]at java.lang.Thread.run(Thread.java:745) [?:1.8.0_51] Caused by: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) ~[?:1.8.0_51] at java.util.HashMap$KeyIterator.next(HashMap.java:1453) ~[?:1.8.0_51] at vk.a(SourceFile:1037) ~[1.14.4.jar:?] at bhr.a(SourceFile:233) ~[1.14.4.jar:?] at bmc.a(SourceFile:217) ~[1.14.4.jar:?] at bmc.b(SourceFile:124) ~[1.14.4.jar:?] at bmv.c(SourceFile:545) ~[1.14.4.jar:?] at bvt.b(SourceFile:269) ~[1.14.4.jar:?] at vk.a(SourceFile:466) ~[1.14.4.jar:?] at vi.a(SourceFile:405) ~[1.14.4.jar:?] at vi$$Lambda$2460/365644605.accept(Unknown Source) ~[?:?] at it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap$1.forEach(Long2ObjectLinkedOpenHashMap.java:1661) ~[1.14.4.jar:?] at com.google.common.collect.Iterables$UnmodifiableIterable.forEach(Iterables.java:105) ~[1.14.4.jar:?] at vi.o(SourceFile:366) ~[1.14.4.jar:?] at vi.a(SourceFile:335) ~[1.14.4.jar:?] at vk.a(SourceFile:316) ~[1.14.4.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:835) ~[1.14.4.jar:?] ... 4 moreDescription: Exception while ticking java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) at java.util.HashMap$KeyIterator.next(HashMap.java:1453) at yw.a(SourceFile:983) at bpa.a(SourceFile:281) at bpa.a(SourceFile:351) at bwr.d(SourceFile:105) at bxe.a(SourceFile:49) at cei$a.a(SourceFile:856) at yw.b(SourceFile:609) at yw$$Lambda$3827/659711812.accept(Unknown Source) at bpn.b(SourceFile:84) at yw.a(SourceFile:351) at net.minecraft.server.MinecraftServer.b(SourceFile:893) at net.minecraft.server.MinecraftServer.a(SourceFile:832) at enr.a(SourceFile:89) at net.minecraft.server.MinecraftServer.run(SourceFile:691) at java.lang.Thread.run(Thread.java:745)
Server Crash (Exception ticking workd: ConcurrentModificationException)Server Crash (Exception ticking world: ConcurrentModificationException)
is duplicated by
![[Mojang] Adrian Östergård](../../../data/assets/gravatar/nighter.jpeg){kind=small}
Thank you for your report!
We're tracking this issue in MC-158466, so this ticket is being resolved and linked as a duplicate.
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Are you hosting on your PC ? And have you made it ? Or are you hosting it on servers ?
We do not have enough information to find the cause of this issue.
Please attach the crash report found in crash-reports/crash-<DATE>-server.txt here.
This issue has been temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.
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I came across the same error, unsure if related. crash-2019-08-27_09.24.12-server.txt
2019-08-27-3.log.gz
And yes, the server is vanilla. downloaded straight from the launcher.
Just had this same error, where our hosted server running with 4 GB of RAM immediately crashed upon a player loading in, with an Exception Ticking World error. No other players online, server had started only a few hours before (and is on a daily scheduled restart). No other players had connected to the server since the restart occurred, either. I'll attach the full crash report (crash-2019-11-12_15.14.34-server.txt).
Other similar bug reports (
MC-148830,MC-148913) state that this might be related to chunk loading, but they're flagged as fixed/duplicates. They've got different error strings but also occurred when chunk loading was taking place.Java version 1.8.0_131, OS Linux (amd64) version 4.9.166-xxxx-std-ipv6-64.
We had three of these crashes today. crash-2019-12-07_18.47.17-server.txt
crash-2019-12-07_19.12.51-server.txt
crash-2019-12-07_19.24.06-server.txt
We can't seem to pin it down to any specific player or object. We are running the vanilla 1.14.4 JAR, 16 GB on a hosted dedicated server.
Happy New Year; We were greeted with another one of these today... crash-2020-01-01_20.06.13-server.txt
is attached.
Is this still an issue in 1.15.2?
So far, not for our server. Instead it's been replaced with "Watching Server" when we updated.
I'm experiencing this in 20w21a. crash-2020-05-20_16.31.58-server.txt
crash-2020-05-21_15.01.49-server.txt
I am encountering this issue again in 1.16.5 for the last couple of days (referenced in the duplicated
, along with the necessary server files referenced within.
MC-215598). It happens at a specific position somewhere related to the regions r.-2.0 and r.-1.0 which can be found in my recently attached crash log crash-2021-02-15_10.12.50-server.txt