Server crash when storing Ars Nouveau Skyweave block in AE2 Spatial Storage
WeizenClown opened this issue · 8 comments
Describe the bug
When attempting to capture or move an Ars Nouveau Skyweave (Mirrorweave) block inside an Applied Energistics 2 Spatial Storage cell, the server hangs and eventually crashes.
The crash occurs inside MirrorWeaveBlock.neighborChanged(), which seems to enter an infinite update loop during block placement triggered by Spatial Storage.
How to reproduce the bug
Place an Ars Nouveau Skyweave block in the world.
Set up an AE2 Spatial Storage network with a Spatial Cell.
Capture and release the Skyweave block into the Spatial Cell for the first time → works as expected.
Wait a short time after retrieving the region from the cell.
Attempt to capture the same region again using the same Spatial Cell → the server hangs and crashes.
If you instead use a brand new Spatial Cell, the process works again for the first capture/release cycle, but fails once reused.
Expected behavior
The Skyweave block should be stored and restored normally, or be rejected gracefully, regardless of whether the Spatial Cell was reused. It should never cause a server hang.
Additional details
Actual Behavior
With a fresh Spatial Cell: First capture/release works fine.
On reusing the same cell: The server hangs indefinitely and the watchdog kills the server.
Crash log shows MirrorWeaveBlock.neighborChanged() repeatedly firing until the tick never completes.
Which minecraft version are you using?
1.21
On which mod loaders does it happen?
NeoForge
Crash log
It looks more like the Ars stuff chunk loading an adjacent chunk and it hanging on that? that definitely shouldn't happen.
@WeizenClown Can you check your debug.log / latest.log to see if there's any exceptions logged right before this happens?
Relevant server stack trace (more for our internal reference):
"Server thread" prio=8 Id=403 TIMED_WAITING on java.lang.String@48b791e
at [email protected]/jdk.internal.misc.Unsafe.park(Native Method)
- waiting on java.lang.String@48b791e
at [email protected]/java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
at TRANSFORMER/[email protected]/net.minecraft.util.thread.BlockableEventLoop.waitForTasks(BlockableEventLoop.java:143)
at TRANSFORMER/[email protected]/net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:133)
at TRANSFORMER/[email protected]/net.minecraft.server.level.ServerChunkCache$MainThreadExecutor.managedBlock(ServerChunkCache.java:533)
at TRANSFORMER/[email protected]/net.minecraft.server.level.ServerChunkCache.getChunk(ServerChunkCache.java:159)
at TRANSFORMER/[email protected]/net.minecraft.world.level.Level.getChunk(Level.java:202)
at TRANSFORMER/[email protected]/net.minecraft.world.level.LevelReader.getChunk(LevelReader.java:130)
at TRANSFORMER/[email protected]/net.minecraft.world.level.Level.getChunk(Level.java:196)
at TRANSFORMER/[email protected]/net.minecraft.world.level.Level.getBlockState(Level.java:382)
at TRANSFORMER/[email protected]/net.minecraft.world.level.Level.updateNeighbourForOutputSignal(Level.java:1071)
at TRANSFORMER/[email protected]/net.minecraft.world.level.block.entity.BlockEntity.setChanged(BlockEntity.java:200)
at TRANSFORMER/[email protected]/net.minecraft.world.level.block.entity.BlockEntity.setChanged(BlockEntity.java:193)
at TRANSFORMER/[email protected]/com.hollingsworth.arsnouveau.common.block.tile.ModdedTile.updateBlock(ModdedTile.java:42)
at TRANSFORMER/[email protected]/com.hollingsworth.arsnouveau.common.block.MirrorWeave.neighborChanged(MirrorWeave.java:184)
at TRANSFORMER/[email protected]/net.minecraft.world.level.block.state.BlockBehaviour$BlockStateBase.handleNeighborChanged(MixinBlockStateBase.java:693)
at TRANSFORMER/[email protected]/appeng.spatial.SpatialStorageHelper$TriggerUpdates.visit(SpatialStorageHelper.java:250)
at TRANSFORMER/[email protected]/appeng.spatial.SpatialStorageHelper.transverseEdges(SpatialStorageHelper.java:129)
at TRANSFORMER/[email protected]/appeng.spatial.SpatialStorageHelper.swapRegions(SpatialStorageHelper.java:206)
at TRANSFORMER/[email protected]/appeng.items.storage.SpatialStorageCellItem.doSpatialTransition(SpatialStorageCellItem.java:145)
at TRANSFORMER/[email protected]/appeng.blockentity.spatial.SpatialIOPortBlockEntity.lambda$transition$1(SpatialIOPortBlockEntity.java:173)
at TRANSFORMER/[email protected]/appeng.blockentity.spatial.SpatialIOPortBlockEntity$$Lambda/0x000015222546a848.accept(Unknown Source)
at TRANSFORMER/[email protected]/appeng.api.networking.IManagedGridNode.ifPresent(IManagedGridNode.java:102)
at TRANSFORMER/[email protected]/appeng.blockentity.spatial.SpatialIOPortBlockEntity.transition(SpatialIOPortBlockEntity.java:159)
at TRANSFORMER/[email protected]/appeng.blockentity.spatial.SpatialIOPortBlockEntity.lambda$new$0(SpatialIOPortBlockEntity.java:53)
at TRANSFORMER/[email protected]/appeng.blockentity.spatial.SpatialIOPortBlockEntity$$Lambda/0x00001522250c48c0.call(Unknown Source)
at TRANSFORMER/[email protected]/appeng.hooks.ticking.TickHandler.processQueue(TickHandler.java:419)
at TRANSFORMER/[email protected]/appeng.hooks.ticking.TickHandler.onServerTickEnd(TickHandler.java:309)
at TRANSFORMER/[email protected]/appeng.hooks.ticking.TickHandler$$Lambda/0x0000152221126f88.accept(Unknown Source)
at MC-BOOTSTRAP/net.neoforged.bus/net.neoforged.bus.ConsumerEventHandler.invoke(ConsumerEventHandler.java:27)
at MC-BOOTSTRAP/net.neoforged.bus/net.neoforged.bus.EventBus.post(EventBus.java:360)
at MC-BOOTSTRAP/net.neoforged.bus/net.neoforged.bus.EventBus.post(EventBus.java:328)
at TRANSFORMER/[email protected]/net.neoforged.neoforge.event.EventHooks.fireServerTickPost(EventHooks.java:1020)
at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:943)
at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:707)
at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:267)
at TRANSFORMER/[email protected]/net.minecraft.server.MinecraftServer$$Lambda/0x0000152224b62d88.run(Unknown Source)
at [email protected]/java.lang.Thread.runWith(Unknown Source)
at [email protected]/java.lang.Thread.run(Unknown Source)
debug-2.log.gz
might be thisone
I think this is the actual root cause. It crashes while trying to load an adjacent chunk, and then the server thread just sits there and waits forever. Now to figure out why the lighting engine crashes...
Do you have any lighting related mods?
[31Aug2025 18:02:44.426] [Worker-Main-47/ERROR] [net.minecraft.Util/]: Caught exception in thread Thread[#385,Worker-Main-47,4,main]
java.lang.NullPointerException: Cannot invoke "net.minecraft.world.level.chunk.DataLayer.get(int, int, int)" because "$$2" is null
at TRANSFORMER/[email protected]/net.minecraft.world.level.lighting.LayerLightSectionStorage.getStoredLevel(LayerLightSectionStorage.java:102) ~[server-1.21.1-20240808.144430-srg.jar%23566!/:?]
at TRANSFORMER/[email protected]/net.minecraft.world.level.lighting.LightEngine.propagateIncreases(LightEngine.java:169) ~[server-1.21.1-20240808.144430-srg.jar%23566!/:?]
at TRANSFORMER/[email protected]/net.minecraft.world.level.lighting.LightEngine.runLightUpdates(LightEngine.java:157) ~[server-1.21.1-20240808.144430-srg.jar%23566!/:?]
at TRANSFORMER/[email protected]/net.minecraft.world.level.lighting.LevelLightEngine.runLightUpdates(LevelLightEngine.java:53) ~[server-1.21.1-20240808.144430-srg.jar%23566!/:?]
at TRANSFORMER/[email protected]/net.minecraft.server.level.ThreadedLevelLightEngine.runUpdate(ThreadedLevelLightEngine.java:185) ~[server-1.21.1-20240808.144430-srg.jar%23566!/:?]
at TRANSFORMER/[email protected]/net.minecraft.server.level.ThreadedLevelLightEngine.lambda$tryScheduleUpdate$27(ThreadedLevelLightEngine.java:164) ~[server-1.21.1-20240808.144430-srg.jar%23566!/:?]
at TRANSFORMER/[email protected]/net.minecraft.util.thread.ProcessorMailbox.pollTask(ProcessorMailbox.java:91) ~[server-1.21.1-20240808.144430-srg.jar%23566!/:?]
at TRANSFORMER/[email protected]/net.minecraft.util.thread.ProcessorMailbox.pollUntil(ProcessorMailbox.java:146) ~[server-1.21.1-20240808.144430-srg.jar%23566!/:?]
at TRANSFORMER/[email protected]/net.minecraft.util.thread.ProcessorMailbox.run(ProcessorMailbox.java:102) ~[server-1.21.1-20240808.144430-srg.jar%23566!/:?]
at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(Unknown Source) [?:?]
at java.base/java.util.concurrent.ForkJoinTask.doExec(Unknown Source) [?:?]
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(Unknown Source) [?:?]
at java.base/java.util.concurrent.ForkJoinPool.scan(Unknown Source) [?:?]
at java.base/java.util.concurrent.ForkJoinPool.runWorker(Unknown Source) [?:?]
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source) [?:?]
[31Aug2025 18:03:40.495] [Server Watchdog/ERROR] [net.minecraft.server.dedicated.ServerWatchdog/FATAL]: A single server tick took 60.00 seconds (should be max 0.05)
@shartte There are no other lighting mods in the pack besides the official ones.
So I got a video where it crashes but cant upload it here. Can I sent it to you through discord? Here is also the latest crash report. https://mclo.gs/z6ow2rK