nolg

After further investigation it appears to happen whenever I join.

Hello, my server crashes at random with the following error: Exception in server tick loop java.util.ConcurrentModificationException: null I've hosted numerous minecraft servers before and never encountered this error. The crashes started about 2 days ago, prior to that the server was fine. Most clients run OptiFine in conjunction with forge version 35.1.36. Here's the full error log: ---- Minecraft Crash Report ---- // Shall we play a game? Time: 2/14/21, 10:40 PM Description: Exception in server tick loop java.util.ConcurrentModificationException: null at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1043) ~[?:?] {} at java.util.ArrayList$Itr.remove(ArrayList.java:1011) ~[?:?] {} at com.blamejared.clumps.Clumps.update(Clumps.java:60) ~[clumps:6.0.0.13] {re:classloading,pl:object_holder_definalize:A} at net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:247) ~[eventbus-4.0.0.jar:?] {} at net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:239) ~[eventbus-4.0.0.jar:?] {} at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?] {} at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?] {} at net.minecraftforge.fml.hooks.BasicEventHooks.onPostWorldTick(BasicEventHooks.java:100) ~[forge:?] {re:classloading} at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:856) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:291) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:786) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:641) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at net.minecraft.server.MinecraftServer.lambda$startServer$0(MinecraftServer.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A} at java.lang.Thread.run(Thread.java:834) [?:?] {} And the mod list: Mod List: forge-1.16.5-36.0.14-server.jar |Minecraft |minecraft |1.16.5 |DONE |NOSIGNATURE logprot-1.16-1.3.jar |Logprot |logprot |1.3 |DONE |NOSIGNATURE voicechat-1.16.4-1.1.5.jar |Simple Voice Chat |voicechat |1.16.4-1.1.5 |DONE |NOSIGNATURE repurposed_structures-1.16.4-2.3.4.jar |Repurposed Structures |repurposed_structures |1.16.4-2.3.4 |DONE |NOSIGNATURE doubledoors_1.16.4-2.1.jar |Double Doors |doubledoors |2.1 |DONE |NOSIGNATURE theoneprobe-1.16-3.0.7.jar |The One Probe |theoneprobe |1.16-3.0.7 |DONE |NOSIGNATURE Instrumental-Mobs-1.16.3-1.3.1.jar |Instrumental Mobs |instrumentalmobs |1.3.1 |DONE |NOSIGNATURE NetherPortalFix_1.16.3-7.2.1.jar |NetherPortalFix |netherportalfix |7.2.1 |DONE |NOSIGNATURE snad-1.0.3-1.16.4.jar |Snad |snad |1.0.3 |DONE |NOSIGNATURE jei-1.16.4-7.6.1.65.jar |Just Enough Items |jei |7.6.1.65 |DONE |NOSIGNATURE abnormals_core-1.16.4-3.0.6.jar |Abnormals Core |abnormals_core |3.0.6 |DONE |NOSIGNATURE KleeSlabs_1.16.3-9.2.0.jar |KleeSlabs |kleeslabs |9.2.0 |DONE |NOSIGNATURE extraboats-1.16.5-2.1.0.jar |Extra Boats |extraboats |2.1.0 |DONE |NOSIGNATURE create-mc1.16.3_v0.3e.jar |Create |create |mc1.16.3_v0.3e |DONE |NOSIGNATURE BetterCaves-Forge-1.16.4-1.1.1.jar |YUNG's Better Caves |bettercaves |1.16.4-1.1.1 |DONE |NOSIGNATURE collective-1.16.4-1.53.jar |Collective |collective |1.53 |DONE |NOSIGNATURE Clumps-6.0.0.13.jar |Clumps |clumps |6.0.0.13 |DONE |NOSIGNATURE FastWorkbench-1.16.4-4.5.0.jar |FastWorkbench |fastbench |4.5.0 |DONE |NOSIGNATURE Placebo-1.16.4-4.4.1.jar |Placebo |placebo |4.4.1 |DONE |NOSIGNATURE sit-1.16.2-v1.3.jar |Sit |sit |v1.3 |DONE |NOSIGNATURE performant-1.16.2-4-3.30m.jar |Performant |performant |3.30m |DONE |NOSIGNATURE YungsApi-1.16.4-Forge-3.jar |YUNG's API |yungsapi |1.16.4-Forge-3 |DONE |NOSIGNATURE netheritehorsearmor-1.6.jar |Netherite Horse Armor Mod |netheritehorsearmor |1.5 |DONE |NOSIGNATURE randompatches-2.1.5-forge.jar |RandomPatches |randompatches |2.1.5-forge |DONE |92:f6:29:d4:09:89:f5:f5:98:5e:20:34:31:d0:7b:58:22:06:bd:a5:d1:6a:92:6e:ac:3d:8d:18:c5:b2:5b:d7 FastFurnace-1.16.4-4.4.0.jar |FastFurnace |fastfurnace |4.4.0 |DONE |NOSIGNATURE Morpheus-1.16.4-4.2.68.jar |Morpheus |morpheus |4.2.68 |DONE |NOSIGNATURE bedspreads-forge-1.16.4-5.1.0.1.jar |Bedspreads |bedspreads |1.16.4-5.1.0.1 |DONE |NOSIGNATURE AI-Improvements-1.16.2-0.3.0.jar |AI-Improvements |aiimprovements |0.3.0 |DONE |NOSIGNATURE Toast-Control-1.16.4-4.3.1.jar |Toast Control |toastcontrol |4.3.1 |DONE |NOSIGNATURE SnowRealMagic-1.16.4-2.3.0.jar |Snow! Real Magic! |snowrealmagic |2.3.0 |DONE |NOSIGNATURE Kiwi-1.16.3-3.4.1.jar |Kiwi |kiwi |3.4.1 |DONE |NOSIGNATURE easyelytrato_1.16.4-1.5.jar |Easy Elytra Takeoff |easyelytrato |1.5 |DONE |NOSIGNATURE dynviewdist-1.8.jar |Dynamic view distance |dynview |1.8 |DONE |NOSIGNATURE traverse-1.16.4-0.4.3.8.jar |Traverse: Reforged |traverse |1.16.4-0.4.3.8 |DONE |NOSIGNATURE TrampleStopper-2.4.8 mc-1.16.4.jar |Trample Stopper |tramplestopper |2.4.8+mc-1.16.4 |DONE |23:8f:95:0f:65:ec:2e:38:99:79:f4:bc:47:8a:0b:df:29:ef:2d:82:66:20:09:20:02:dc:4a:15:97:45:f8:43 JustEnoughResources-1.16.4-0.12.0.104.jar |Just Enough Resources |jeresources |0.12.0.104 |DONE |NOSIGNATURE horsestandstill-1.16.3-1.0.1.jar |Stupid Horse Stand Still |horsestandstill |1.16.3-1.0.1 |DONE |1f:47:ac:b1:61:82:96:b8:47:19:16:d2:61:81:11:60:3a:06:4b:61:31:56:7d:44:31:1e:0c:6f:22:5b:4c:ed BetterThanMending-1.5.1.jar |BetterThanMending |betterthanmending |1.5.1 |DONE |NOSIGNATURE BetterBurning-1.16.4-5.0.3.jar |BetterBurning |betterburning |5.0.3 |DONE |eb:c4:b1:67:8b:f9:0c:db:dc:4f:01:b1:8e:61:64:39:4c:10:85:0b:a6:c4:c7:48:f0:fa:95:f2:cb:08:3a:e5 bwncr-1.16.4-3.9.16.jar |Bad Wither No Cookie Reloaded |bwncr |1.16.4-3.9.16 |DONE |NOSIGNATURE bettertridentreturn-1.16.4-1.0.1.jar |Better Trident Return |bettertridentreturn |1.0.1 |DONE |NOSIGNATURE forge-1.16.5-36.0.14-universal.jar |Forge |forge |36.0.14 |DONE |22:af:21:d8:19:82:7f:93:94:fe:2b:ac:b7:e4:41:57:68:39:87:b1:a7:5c:c6:44:f9:25:74:21:14:f5:0d:90 Waddles-1.16.4-0.8.11.jar |Waddles |waddles |1.16.4-0.8.11 |DONE |NOSIGNATURE MmmMmmMmmMmm-1.16-1.0.1.jar |MmmMmmMmmMmm |dummmmmmy |1.0.1 |DONE |NOSIGNATURE ServerTabInfo-1.16.4-1.3.3.jar |Server Tab Info |servertabinfo |1.3.3 |DONE |NOSIGNATURE PrettyBeaches_1.16.3-5.2.0.jar |Pretty Beaches |prettybeaches |5.2.0 |DONE |NOSIGNATURE PathToDirt-1.1.0-mc1.16.x.jar |Path To Dirt |pathtodirt |1.1.0 |DONE |NOSIGNATURE CraftingTweaks_1.16.3-12.2.0.jar |Crafting Tweaks |craftingtweaks |12.2.0 |DONE |NOSIGNATURE Any help is appreciated!

Hello - I'm hosting a server thorugh ExtraVM, running 6GB RAM on their i9-9900K CPU. No problems with hardware, CPU usage caps at 10% and RAM usage only runs to about 5/6GB if I don't manage the backups that happen periodically (to fill out the 6GB RAM it takes about 20+ backups, which I always clear before we can get to). Profiled a lot with LagGoggles and TickProfiler and fixed whatever I could find but to minimal result. Server does fine with 3 or so people on but past 3 the server chugs hard. TPS falls to about 11 and progressively degrades. Most recent crash log (today) Another crash log (1 week ago). If any other info is required, I will happily provide. Thanks in advance for all of your help!