Netty + IKVM.NET = crash

[jessiepathfinder]

C:\Users\jessi\Desktop\ikvmtest>ikvm -jar 1.12.2.jar nogui
[15:02:12] [Server thread/INFO]: Starting minecraft server version 1.12.2
[15:02:12] [Server thread/INFO]: Loading properties
[15:02:12] [Server thread/INFO]: Default game type: CREATIVE
[15:02:12] [Server thread/INFO]: Generating keypair
[15:02:12] [Server thread/INFO]: Starting Minecraft server on *:25565
[15:02:13] [Server thread/INFO]: Using default channel type
[15:02:16] [Server thread/WARN]: **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
[15:02:16] [Server thread/WARN]: The server will make no attempt to authenticate usernames. Beware.
[15:02:16] [Server thread/WARN]: While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.
[15:02:16] [Server thread/WARN]: To change this, set "online-mode" to "true" in the server.properties file.
[15:02:17] [Server thread/INFO]: Preparing level "world"
[15:02:21] [Server thread/INFO]: Loaded 488 advancements
[15:02:21] [Server thread/INFO]: Preparing start region for level 0
[15:02:22] [Server thread/INFO]: Preparing spawn area: 17%
[15:02:24] [Server thread/INFO]: Preparing spawn area: 24%
[15:02:25] [Server thread/INFO]: Preparing spawn area: 45%
[15:02:26] [Server thread/INFO]: Done (8.975s)! For help, type "help" or "?"
[15:02:50] [Server thread/INFO]: jessielesbian[/127.0.0.1:32618] logged in with entity id 160 at (-26.5, 69.0, -60.5)
[15:02:51] [Server thread/INFO]: jessielesbian joined the game
[15:02:51] [Netty Server IO #1/WARN]: Failed to release a message: PooledUnsafeDirectByteBuf(freed)
java.lang.ArrayIndexOutOfBoundsException: null
at io.netty.util.internal.shaded.org.jctools.util.UnsafeRefArrayAccess.soRefElement(UnsafeRefArrayAccess.java:64) ~[1.12.2.jar:?]
at io.netty.util.internal.shaded.org.jctools.queues.BaseMpscLinkedArrayQueue.offer(BaseMpscLinkedArrayQueue.java:311) ~[1.12.2.jar:?]
at io.netty.util.internal.shaded.org.jctools.queues.MpscChunkedArrayQueue.offer(MpscChunkedArrayQueue.java:43) ~[1.12.2.jar:?]
at io.netty.util.internal.shaded.org.jctools.queues.BaseMpscLinkedArrayQueue.relaxedOffer(BaseMpscLinkedArrayQueue.java:494) ~[1.12.2.jar:?]
at io.netty.util.internal.shaded.org.jctools.queues.MpscChunkedArrayQueue.relaxedOffer(MpscChunkedArrayQueue.java:43) ~[1.12.2.jar:?]
at io.netty.util.Recycler$LocalPool.release(Recycler.java:291) ~[1.12.2.jar:?]
at io.netty.util.Recycler$DefaultHandle.recycle(Recycler.java:232) ~[1.12.2.jar:?]
at io.netty.buffer.PooledByteBuf.recycle(PooledByteBuf.java:185) ~[1.12.2.jar:?]
at io.netty.buffer.PooledByteBuf.deallocate(PooledByteBuf.java:181) ~[1.12.2.jar:?]
at io.netty.buffer.AbstractReferenceCountedByteBuf.handleRelease(AbstractReferenceCountedByteBuf.java:113) ~[1.12.2.jar:?]
at io.netty.buffer.AbstractReferenceCountedByteBuf.release(AbstractReferenceCountedByteBuf.java:101) ~[1.12.2.jar:?]
at io.netty.util.ReferenceCountUtil.release(ReferenceCountUtil.java:90) ~[1.12.2.jar:?]
at io.netty.util.ReferenceCountUtil.safeRelease(ReferenceCountUtil.java:116) [1.12.2.jar:?]
at io.netty.channel.ChannelOutboundBuffer.remove(ChannelOutboundBuffer.java:272) [1.12.2.jar:?]
at io.netty.channel.ChannelOutboundBuffer.removeBytes(ChannelOutboundBuffer.java:352) [1.12.2.jar:?]
at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:422) [1.12.2.jar:?]
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:931) [1.12.2.jar:?]
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:356) [1.12.2.jar:?]
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:896) [1.12.2.jar:?]
at io.netty.channel.DefaultChannelPipeline$HeadContext.flush(DefaultChannelPipeline.java:1373) [1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:750) [1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:742) [1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:728) [1.12.2.jar:?]
at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:126) [1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:750) [1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:765) [1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:790) [1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:759) [1.12.2.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:808) [1.12.2.jar:?]
at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1025) [1.12.2.jar:?]
at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:306) [1.12.2.jar:?]
at gw$4.run(SourceFile:201) [1.12.2.jar:?]
at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:175) [1.12.2.jar:?]
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167) [1.12.2.jar:?]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) [1.12.2.jar:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503) [1.12.2.jar:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:996) [1.12.2.jar:?]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [1.12.2.jar:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0]
[15:02:51] [Server thread/INFO]: jessielesbian lost connection: Internal Exception: io.netty.handler.codec.EncoderException: java.lang.ArrayIndexOutOfBoundsException
[15:02:51] [Server thread/INFO]: jessielesbian left the game
stop
[15:03:23] [Server thread/INFO]: Stopping the server
[15:03:24] [Server thread/INFO]: Stopping server
[15:03:24] [Server thread/INFO]: Saving players
[15:03:24] [Server thread/INFO]: Saving worlds
[15:03:24] [Server thread/INFO]: Saving chunks for level 'world'/overworld
[15:03:24] [Server thread/INFO]: Saving chunks for level 'world'/the_nether
[15:03:24] [Server thread/INFO]: Saving chunks for level 'world'/the_end
[15:03:24] [Server Shutdown Thread/INFO]: Stopping server
[15:03:24] [Server Shutdown Thread/INFO]: Saving players
[15:03:24] [Server Shutdown Thread/INFO]: Saving worlds
[15:03:24] [Server Shutdown Thread/INFO]: Saving chunks for level 'world'/overworld
[15:03:24] [Server Shutdown Thread/INFO]: Saving chunks for level 'world'/the_nether
[15:03:24] [Server Shutdown Thread/INFO]: Saving chunks for level 'world'/the_end

[hyperxpro]

More details are needed.

[slandelle]

I would argue that IKVM (a Java implementation in .Net) is not a supported platform.
You have to use a real JVM.

[chrisvest]

The exception is coming out of JCTools code. Either JCTools has a bug, or IKVM.NET has a bug (perhaps in their JMM implementation), but in either case I don't think it's a Netty issue per se. It can also be that both are buggy. We've seen similar exceptions from running on Arm, but too rare to diagnose as far as I understood.

Pinging @nitsanw in case he has insights.

[normanmaurer]

Closing this as there is not much we can do here.

[nitsanw]

I think this is similar to this one: #8916
Essentially, IKVM has a weird Unsafe impl. which messes up JCTools. This was fixed in Netty at some point, but maybe OP is using an old Netty?