u/Eric_Gomes_Gregory

I've custom built a machine with a Ryzen 5 5600x 32Gb of ram (ddr4 3200Mhz) for a home nas and modded Minecraft (All the Mods 9 - No Frills) server. But I'm having constant problems with the server.

Various times I've had issues with server crashes related to de sync of players and constant lag spikes while on a boat, with as little as 2 players.

After debugging the server with Spark as well as the TrueNAS I've gotten this logs:

From Spark:

Server thread100.00%

java.lang.Thread.run()99.51%
net.minecraft.server.MinecraftServer$$Lambda$50362.0x00007f48a14173d0.run()99.51%
net.minecraft.server.MinecraftServer.lambda$spin$2()99.51%
net.minecraft.server.MinecraftServer.runServer()99.51%
net.minecraft.server.MinecraftServer.waitUntilNextTick()93.24%
net.minecraft.util.thread.BlockableEventLoop.managedBlock()93.01%
net.minecraft.util.thread.BlockableEventLoop.waitForTasks()80.82%
java.util.concurrent.locks.LockSupport.parkNanos()80.82%
jdk.internal.misc.Unsafe.park()80.82%
libpthread-2.31.so.pthread_cond_timedwait@@GLIBC_2.3.2()80.74%

libjvm.so.Unsafe_Park()0.06%
libc-2.31.so.clock_gettime()0.02%
net.minecraft.server.MinecraftServer.pollTask()12.18%
net.minecraft.util.thread.BlockableEventLoop.runAllTasks()0.24%48ms
net.minecraft.server.MinecraftServer.tickServer()6.27%
not_walkable_Java (native)0.22%
GC_active (native)0.20%
unknown_Java (native)0.08%

While the last crash report stated with

---- Minecraft Crash Report ----
// You're mean.

Time: 2026-05-08 19:56:45
Description: Watching Server

java.lang.Error: ServerHangWatchdog detected that a single server tick took 6.00 seconds (should be max 0.05)
at jdk.internal.misc.Unsafe.park(Native Method) ~[?:?] {}
at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source) ~[?:?] {re:mixin}
at net.minecraft.util.thread.BlockableEventLoop.m_5667_(BlockableEventLoop.java:521) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.BlockableEventLoopMixin,pl:mixin:A}
at net.minecraft.util.thread.BlockableEventLoop.m_18701_(BlockableEventLoop.java:141) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix_loop_spin_waiting.BlockableEventLoopMixin,pl:mixin:A}
at net.minecraft.server.level.ServerChunkCache.m_7587_(ServerChunkCache.java:131) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:cupboard.mixins.json:ChunkLoadDebug,pl:mixin:APP:modernfix-forge.mixins.json:bugfix.chunk_deadlock.ServerChunkCache_CurrentLoadingMixin,pl:mixin:A}
at net.minecraft.world.level.Level.m_6522_(Level.java:187) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:computing_frames,pl:accesstransformer:B,xf:fml:twilightforest:cloud,re:mixin,pl:accesstransformer:B,xf:fml:twilightforest:cloud,re:classloading,pl:accesstransformer:B,xf:fml:twilightforest:cloud,pl:mixin:APP:create_new_age.mixins.json:LevelMixin,pl:mixin:APP:botania_xplat.mixins.json:LevelAccessor,pl:mixin:APP:sliceanddice.mixins.json:LevelMixin,pl:mixin:APP:adastra.mixins.json:common.multipart.LevelMixin,pl:mixin:APP:utilitix.mixins.json:MixinLevel,pl:mixin:APP:citadel.mixins.json:LevelMixin,pl:mixin:APP:observable.common.json:LevelMixin,pl:mixin:APP:kubejs-common.mixins.json:LevelMixin,pl:mixin:A}
at net.minecraft.world.level.LevelReader.m_46819_(LevelReader.java:129) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:computing_frames,re:mixin,re:classloading}
at net.minecraft.world.level.Level.m_6325_(Level.java:182) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:computing_frames,pl:accesstransformer:B,xf:fml:twilightforest:cloud,re:mixin,pl:accesstransformer:B,xf:fml:twilightforest:cloud,re:classloading,pl:accesstransformer:B,xf:fml:twilightforest:cloud,pl:mixin:APP:create_new_age.mixins.json:LevelMixin,pl:mixin:APP:botania_xplat.mixins.json:LevelAccessor,pl:mixin:APP:sliceanddice.mixins.json:LevelMixin,pl:mixin:APP:adastra.mixins.json:common.multipart.LevelMixin,pl:mixin:APP:utilitix.mixins.json:MixinLevel,pl:mixin:APP:citadel.mixins.json:LevelMixin,pl:mixin:APP:observable.common.json:LevelMixin,pl:mixin:APP:kubejs-common.mixins.json:LevelMixin,pl:mixin:A}
at net.minecraft.world.entity.Entity.m_20343_(Entity.java:3266) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:cupboard.mixins.json:EntityLoadMixin,pl:mixin:APP:create.mixins.json:EntityMixin,pl:mixin:APP:modernfix-common.mixins.json:bugfix.chunk_deadlock.EntityMixin,pl:mixin:APP:shrink.mixins.json:MixinEntity,pl:mixin:APP:balm.mixins.json:EntityMixin,pl:mixin:APP:mixins.shetiphiancore.json:SPC_ThinBlockHandler$_Entity,pl:mixin:APP:botania_xplat.mixins.json:EntityAccessor,pl:mixin:APP:botania_xplat.mixins.json:EntityMixin,pl:mixin:APP:curios.mixins.json:AccessorEntity,pl:mixin:APP:attributeslib.mixins.json:EntityMixin,pl:mixin:APP:tombstone.mixins.json:EntityMixin,pl:mixin:APP:sliceanddice.mixins.json:EntityMixin,pl:mixin:APP:mixins.pneumaticcraft.json:accessors.EntityAccess,pl:mixin:APP:adastra-common.mixins.json:common.EntityBelowWorldMixin,pl:mixin:APP:ad_astra_giselle_addon.mixin.common.json:minecraft.EntityMixin,pl:mixin:APP:netherportalfix.mixins.json:EntityAccessor,pl:mixin:APP:ars_nouveau.mixins.json:rewind.RewindEntityMixin,pl:mixin:APP:bookshelf.common.mixins.json:accessors.entity.AccessorEntity,pl:mixin:APP:railways-common.mixins.json:conductor_possession.MixinEntity,pl:mixin:APP:lionfishapi.mixins.json:EntityMixin,pl:mixin:APP:kubejs-forge.mixins.json:EntityMixin,pl:mixin:APP:kubejs-common.mixins.json:EntityMixin,pl:mixin:APP:blueflame.mixin.json:MixinEntity,pl:mixin:APP:mixins.artifacts.common.json:item.umbrella.EntityMixin,pl:mixin:APP:mixins.artifacts.common.json:item.wearable.aquadashers.EntityMixin,pl:mixin:APP:ichunutil.mixins.json:EntityMixin,pl:mixin:APP:mixins.brandonscore.json:EntityAccessor,pl:mixin:APP:quark.mixins.json:EntityMixin,pl:mixin:APP:supplementaries-common.mixins.json:EntityMixin,pl:mixin:APP:mixins.irons_spellbooks.json:EntityMixin,pl:mixin:APP:expandability.mixins.json:swimming.EntityMixin,pl:mixin:APP:expandability-common.mixins.json:swimming.EntityMixin,pl:mixin:APP:create.mixins.json:ContraptionDriverInteractMixin,pl:mixin:APP:create.mixins.json:accessor.EntityAccessor,pl:mixin:A}
at net.minecraft.world.entity.Entity.m_6034_(Entity.java:394) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:cupboard.mixins.json:EntityLoadMixin,pl:mixin:APP:create.mixins.json:EntityMixin,pl:mixin:APP:modernfix-common.mixins.json:bugfix.chunk_deadlock.EntityMixin,pl:mixin:APP:shrink.mixins.json:MixinEntity,pl:mixin:APP:balm.mixins.json:EntityMixin,pl:mixin:APP:mixins.shetiphiancore.json:SPC_ThinBlockHandler$_Entity,pl:mixin:APP:botania_xplat.mixins.json:EntityAccessor,pl:mixin:APP:botania_xplat.mixins.json:EntityMixin,pl:mixin:APP:curios.mixins.json:AccessorEntity,pl:mixin:APP:attributeslib.mixins.json:EntityMixin,pl:mixin:APP:tombstone.mixins.json:EntityMixin,pl:mixin:APP:sliceanddice.mixins.json:EntityMixin,pl:mixin:APP:mixins.pneumaticcraft.json:accessors.EntityAccess,pl:mixin:APP:adastra-common.mixins.json:common.EntityBelowWorldMixin,pl:mixin:APP:ad_astra_giselle_addon.mixin.common.json:minecraft.EntityMixin,pl:mixin:APP:netherportalfix.mixins.json:EntityAccessor,pl:mixin:APP:ars_nouveau.mixins.json:rewind.RewindEntityMixin,pl:mixin:APP:bookshelf.common.mixins.json:accessors.entity.AccessorEntity,pl:mixin:APP:railways-common.mixins.json:conductor_possession.MixinEntity,pl:mixin:APP:lionfishapi.mixins.json:EntityMixin,pl:mixin:APP:kubejs-forge.mixins.json:EntityMixin,pl:mixin:APP:kubejs-common.mixins.json:EntityMixin,pl:mixin:APP:blueflame.mixin.json:MixinEntity,pl:mixin:APP:mixins.artifacts.common.json:item.umbrella.EntityMixin,pl:mixin:APP:mixins.artifacts.common.json:item.wearable.aquadashers.EntityMixin,pl:mixin:APP:ichunutil.mixins.json:EntityMixin,pl:mixin:APP:mixins.brandonscore.json:EntityAccessor,pl:mixin:APP:quark.mixins.json:EntityMixin,pl:mixin:APP:supplementaries-common.mixins.json:EntityMixin,pl:mixin:APP:mixins.irons_spellbooks.json:EntityMixin,pl:mixin:APP:expandability.mixins.json:swimming.EntityMixin,pl:mixin:APP:expandability-common.mixins.json:swimming.EntityMixin,pl:mixin:APP:create.mixins.json:ContraptionDriverInteractMixin,pl:mixin:APP:create.mixins.json:accessor.EntityAccessor,pl:mixin:A}
at net.minecraft.world.entity.Entity$$Lambda$53554/0x00007f1afd88ca00.m_20372_(Unknown Source) ~[?:?] {}
at net.minecraft.world.entity.vehicle.Boat.m_19956_(Boat.java:668) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:adastra-common.mixins.json:common.gravity.BoatMixin,pl:mixin:APP:quark.mixins.json:BoatMixin,pl:mixin:A}
at net.minecraft.world.entity.Entity.m_7332_(Entity.java:1874) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:cupboard.mixins.json:EntityLoadMixin,pl:mixin:APP:create.mixins.json:EntityMixin,pl:mixin:APP:modernfix-common.mixins.json:bugfix.chunk_deadlock.EntityMixin,pl:mixin:APP:shrink.mixins.json:MixinEntity,pl:mixin:APP:balm.mixins.json:EntityMixin,pl:mixin:APP:mixins.shetiphiancore.json:SPC_ThinBlockHandler$_Entity,pl:mixin:APP:botania_xplat.mixins.json:EntityAccessor,pl:mixin:APP:botania_xplat.mixins.json:EntityMixin,pl:mixin:APP:curios.mixins.json:AccessorEntity,pl:mixin:APP:attributeslib.mixins.json:EntityMixin,pl:mixin:APP:tombstone.mixins.json:EntityMixin,pl:mixin:APP:sliceanddice.mixins.json:EntityMixin,pl:mixin:APP:mixins.pneumaticcraft.json:accessors.EntityAccess,pl:mixin:APP:adastra-common.mixins.json:common.EntityBelowWorldMixin,pl:mixin:APP:ad_astra_giselle_addon.mixin.common.json:minecraft.EntityMixin,pl:mixin:APP:netherportalfix.mixins.json:EntityAccessor,pl:mixin:APP:ars_nouveau.mixins.json:rewind.RewindEntityMixin,pl:mixin:APP:bookshelf.common.mixins.json:accessors.entity.AccessorEntity,pl:mixin:APP:railways-common.mixins.json:conductor_possession.MixinEntity,pl:mixin:APP:lionfishapi.mixins.json:EntityMixin,pl:mixin:APP:kubejs-forge.mixins.json:EntityMixin,pl:mixin:APP:kubejs-common.mixins.json:EntityMixin,pl:mixin:APP:blueflame.mixin.json:MixinEntity,pl:mixin:APP:mixins.artifacts.common.json:item.umbrella.EntityMixin,pl:mixin:APP:mixins.artifacts.common.json:item.wearable.aquadashers.EntityMixin,pl:mixin:APP:ichunutil.mixins.json:EntityMixin,pl:mixin:APP:mixins.brandonscore.json:EntityAccessor,pl:mixin:APP:quark.mixins.json:EntityMixin,pl:mixin:APP:supplementaries-common.mixins.json:EntityMixin,pl:mixin:APP:mixins.irons_spellbooks.json:EntityMixin,pl:mixin:APP:expandability.mixins.json:swimming.EntityMixin,pl:mixin:APP:expandability-common.mixins.json:swimming.EntityMixin,pl:mixin:APP:create.mixins.json:ContraptionDriverInteractMixin,pl:mixin:APP:create.mixins.json:accessor.EntityAccessor,pl:mixin:A}
at net.minecraft.server.level.ServerPlayer.m_7998_(ServerPlayer.java:1721) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:botania_xplat.mixins.json:ServerPlayerMixin,pl:mixin:APP:glitchcore.forge.mixins.json:MixinServerPlayer,pl:mixin:APP:mixins.pneumaticcraft.json:accessors.ServerPlayerAccess,pl:mixin:APP:alltheleaks.mixins.json:main.ServerPlayerMixin,pl:mixin:APP:adastra-common.mixins.json:common.radio.ServerPlayerMixin,pl:mixin:APP:netherportalfix.mixins.json:ServerPlayerMixin,pl:mixin:APP:netherportalfix.mixins.json:ForgeServerPlayerMixin,pl:mixin:APP:ars_nouveau.mixins.json:camera.ANServerPlayerMixin,pl:mixin:APP:kubejs-common.mixins.json:ServerPlayerMixin,pl:mixin:APP:moonlight-common.mixins.json:ServerPlayerMixin,pl:mixin:APP:tombstone.mixins.json:ServerPlayerMixin,pl:mixin:APP:railways-common.mixins.json:conductor_possession.ServerPlayerMixin,pl:mixin:A}
at net.minecraft.server.players.PlayerList.m_11261_(PlayerList.java:239) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:A}
at net.minecraft.server.network.ServerLoginPacketListenerImpl.m_143699_(ServerLoginPacketListenerImpl.java:139) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:connectivity.mixins.json:ServerLoginNetHandlerMixin,pl:mixin:A}
at net.minecraft.server.network.ServerLoginPacketListenerImpl.m_10055_(ServerLoginPacketListenerImpl.java:126) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:connectivity.mixins.json:ServerLoginNetHandlerMixin,pl:mixin:A}
at net.minecraft.server.network.ServerLoginPacketListenerImpl.m_9933_(ServerLoginPacketListenerImpl.java:70) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:connectivity.mixins.json:ServerLoginNetHandlerMixin,pl:mixin:A}
at net.minecraft.network.Connection.m_129483_(Connection.java:263) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,re:classloading,pl:mixin:A}
at net.minecraft.server.network.ServerConnectionListener.m_9721_(ServerConnectionListener.java:142) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:classloading}
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:907) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:dankstorage.mixins.json:MinecraftServerAccess,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:ichunutil.mixins.json:MinecraftServerAccessorMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.dedicated.DedicatedServer.m_5703_(DedicatedServer.java:283) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins/common/nochatreports.mixins.json:server.MixinDedicatedServer,pl:mixin:APP:tombstone.mixins.json:DedicatedServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:814) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:dankstorage.mixins.json:MinecraftServerAccess,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:ichunutil.mixins.json:MinecraftServerAccessorMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:661) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:dankstorage.mixins.json:MinecraftServerAccess,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:ichunutil.mixins.json:MinecraftServerAccessorMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:251) ~[server-1.20.1-20230612.114412-srg.jar%23729!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated_reload_executor.MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:dankstorage.mixins.json:MinecraftServerAccess,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:MinecraftServerMixin,pl:mixin:APP:kubejs-common.mixins.json:inject_resources.MinecraftServerMixin,pl:mixin:APP:ichunutil.mixins.json:MinecraftServerAccessorMixin,pl:mixin:APP:ae2.mixins.json:spatial.MinecraftServerMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer$$Lambda$50366/0x00007f1afd440478.run(Unknown Source) ~[?:?] {}
at java.lang.Thread.run(Unknown Source) ~[?:?] {re:mixin}

Sorry for the massive logs. Bur I'm very confused on what may be causing this issue.