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  1. Minecraft: Java Edition
  2. MC-96604

java.lang.IllegalStateException: failed to create a child event loop

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • None
    • Minecraft 1.8.9
    • None
    • *Processor:* Intel(R) Core i5-4200U Cpu @ 1.60GHz 2.30Ghz
      *RAM:* 4gb
      *GPU:* NVIDIA 820m
      *System:* Windows 10 Pro 64-bit
      *Java:* Java SE Runtime Environment 8u71 - Windows 64x
      *Minecraft 1.8.9 vanilla*
    • Unconfirmed

      What happened

      • I launched Minecraft
      • Tried to create a new world (or joined an existing world) (Single-player)
      • Minecraft stuck at "Building terrain" for second then crashed, crash report shows up

      Crash report

      ---- Minecraft Crash Report ----
      // I'm sorry, Dave.

      Time: 2/5/16 3:54 PM
      Description: Updating screen events

      java.lang.IllegalStateException: failed to create a child event loop
      at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:68)
      at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
      at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
      at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
      at ll$1.a(SourceFile:44)
      at ll$1.b(SourceFile:41)
      at no.c(SourceFile:10)
      at ll.a(SourceFile:121)
      at ave.a(SourceFile:1942)
      at axv.i(SourceFile:172)
      at axv$a.a(SourceFile:224)
      at awi.p(SourceFile:315)
      at axv.k(SourceFile:82)
      at axu.p(SourceFile:390)
      at ave.s(SourceFile:1498)
      at ave.av(SourceFile:889)
      at ave.a(SourceFile:325)
      at net.minecraft.client.main.Main.main(SourceFile:124)
      Caused by: io.netty.channel.ChannelException: failed to open a new selector
      at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
      at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
      at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
      at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64)
      ... 17 more
      Caused by: java.io.IOException: Unable to establish loopback connection
      at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
      at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
      at java.security.AccessController.doPrivileged(Native Method)
      at sun.nio.ch.PipeImpl.<init>(Unknown Source)
      at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source)
      at java.nio.channels.Pipe.open(Unknown Source)
      at sun.nio.ch.WindowsSelectorImpl.<init>(Unknown Source)
      at sun.nio.ch.WindowsSelectorProvider.openSelector(Unknown Source)
      at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
      ... 20 more
      Caused by: java.net.SocketException: Unrecognized Windows Sockets error: 10107: socket
      at sun.nio.ch.Net.socket0(Native Method)
      at sun.nio.ch.Net.serverSocket(Unknown Source)
      at sun.nio.ch.ServerSocketChannelImpl.<init>(Unknown Source)
      at sun.nio.ch.SelectorProviderImpl.openServerSocketChannel(Unknown Source)
      at java.nio.channels.ServerSocketChannel.open(Unknown Source)
      at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(Unknown Source)
      ... 29 more

      A detailed walkthrough of the error, its code path and all known details is as follows:
      ---------------------------------------------------------------------------------------

      – Head –
      Stacktrace:
      at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:68)
      at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
      at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
      at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
      at ll$1.a(SourceFile:44)
      at ll$1.b(SourceFile:41)
      at no.c(SourceFile:10)
      at ll.a(SourceFile:121)
      at ave.a(SourceFile:1942)
      at axv.i(SourceFile:172)
      at axv$a.a(SourceFile:224)
      at awi.p(SourceFile:315)
      at axv.k(SourceFile:82)
      at axu.p(SourceFile:390)

      – Affected screen –
      Details:
      Screen name: aya
      Stacktrace:
      at ave.s(SourceFile:1498)
      at ave.av(SourceFile:889)
      at ave.a(SourceFile:325)
      at net.minecraft.client.main.Main.main(SourceFile:124)

      – System Details –
      Details:
      Minecraft Version: 1.8.9
      Operating System: Windows 10 (amd64) version 10.0
      Java Version: 1.8.0_71, Oracle Corporation
      Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
      Memory: 61284304 bytes (58 MB) / 231563264 bytes (220 MB) up to 1060372480 bytes (1011 MB)
      JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
      IntCache: cache: 9, tcache: 0, allocated: 13, tallocated: 95
      Launched Version: 1.8.9
      LWJGL: 2.9.4
      OpenGL: GeForce 820M/PCIe/SSE2 GL version 4.5.0 NVIDIA 353.54, NVIDIA Corporation
      GL Caps: Using GL 1.3 multitexturing.
      Using GL 1.3 texture combiners.
      Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
      Shaders are available because OpenGL 2.1 is supported.
      VBOs are available because OpenGL 1.5 is supported.

      Using VBOs: No
      Is Modded: Probably not. Jar signature remains and client brand is untouched.
      Type: Client (map_client.txt)
      Resource Packs:
      Current Language: English (US)
      Profiler Position: N/A (disabled)
      CPU: 4x Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz

      Steps I have tried

      • Uninstall everything then reinstall everything (minecraft, java) multiple times
      • Disable my antivirus and firewall completely (I saw a solution to this problem is to uninstall McAfee – _I don't use McAfee, I use Windows Defender (default antivirus of Windows 10), and I disabled it)
      • Reboot my PC many times
      • Update all my drivers
      • Spend a week looking on Google trying to solve this problem but no luck so far

      Few things to consider

      If you need any further information to work with the problem, please let me know. Thank you in advance

            Unassigned Unassigned
            mindstorm1998 Daniel Duong
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              Created:
              Updated:
              Resolved: