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  1. Minecraft: Java Edition
  2. MC-34749

Hopper: java.lang.IllegalStateException: failed to create a child event loop - Caused by AntiVirus / Firewall software

    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Invalid
    • Affects Version/s: Minecraft 13w41a, Minecraft 13w41b, Minecraft 13w42b, Minecraft 13w43a, Minecraft 1.7, Minecraft 1.7.1, Minecraft 1.7.2, Minecraft 13w48a, Minecraft 13w48b, Minecraft 13w49a, Minecraft 1.7.3, Minecraft 1.7.4, Minecraft 1.7.5, Minecraft 1.7.9
    • Fix Version/s: None
    • Confirmation Status:
      Community Consensus

      Description

      Moderator Note

      This issue is most commonly caused by a broken installation of Avast! free edition Anti-virus software. A reinstallation of Avast! and a reboot usually fixes it.

      McAfee anti-virus software (and derivatives) are also know to cause this issue, and currently the only known solution is to uninstall this software to correct the problem.

      Also Outpost security may cause that issue.


      Please visit the #minecrafthelp channel for further support.


      This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-294053/

      Crash:

      java.lang.IllegalStateException: failed to create a child event loop
      	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:61)
      	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 mo.<init>(SourceFile:36)
      	at net.minecraft.server.MinecraftServer.<init>(SourceFile:114)
      	at brh.<init>(SourceFile:38)
      	at ays.a(SourceFile:1585)
      	at bbs.e(SourceFile:162)
      	at bbt.a(SourceFile:214)
      	at bam.a(SourceFile:186)
      	at bbs.a(SourceFile:187)
      

      The following is the first clean report made public about this crash:

      ---- Minecraft Crash Report ----
      // Don't do that.
      
      Time: 10.10.13 17:10
      Description: Rendering screen
      
      java.lang.IllegalStateException: failed to create a child event loop
      	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:61)
      	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 mo.<init>(SourceFile:36)
      	at net.minecraft.server.MinecraftServer.<init>(SourceFile:114)
      	at brh.<init>(SourceFile:38)
      	at ays.a(SourceFile:1585)
      	at bbs.e(SourceFile:162)
      	at bbt.a(SourceFile:214)
      	at bam.a(SourceFile:186)
      	at bbs.a(SourceFile:187)
      	at bkv.b(SourceFile:851)
      	at ays.ab(SourceFile:783)
      	at ays.e(SourceFile:706)
      	at net.minecraft.client.main.Main.main(SourceFile:103)
      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:57)
      	... 15 more
      Caused by: java.io.IOException: Unable to establish loopback connection
      	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)
      	... 18 more
      Caused by: java.net.ConnectException: Connection refused: connect
      	at sun.nio.ch.Net.connect(Native Method)
      	at sun.nio.ch.SocketChannelImpl.connect(Unknown Source)
      	at java.nio.channels.SocketChannel.open(Unknown Source)
      	... 26 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:61)
      	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 mo.<init>(SourceFile:36)
      	at net.minecraft.server.MinecraftServer.<init>(SourceFile:114)
      	at brh.<init>(SourceFile:38)
      	at ays.a(SourceFile:1585)
      	at bbs.e(SourceFile:162)
      	at bbt.a(SourceFile:214)
      	at bam.a(SourceFile:186)
      	at bbs.a(SourceFile:187)
      
      -- Screen render details --
      Details:
      	Screen name: bry
      	Mouse location: Scaled: (203, 62). Absolute: (406, 355)
      	Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2
      Stacktrace:
      	at bkv.b(SourceFile:851)
      	at ays.ab(SourceFile:783)
      	at ays.e(SourceFile:706)
      	at net.minecraft.client.main.Main.main(SourceFile:103)
      
      -- System Details --
      Details:
      	Minecraft Version: 13w41a
      	Operating System: Windows Vista (amd64) version 6.1
      	Java Version: 1.6.0_13, Sun Microsystems Inc.
      	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
      	Memory: 132615600 bytes (126 MB) / 170655744 bytes (162 MB) up to 954466304 bytes (910 MB)
      	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
      	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
      	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
      	Launched Version: 13w41a
      	LWJGL: 2.9.0
      	OpenGL: GeForce GT 220/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
      	Is Modded: Probably not. Jar signature remains and client brand is untouched.
      	Type: Client (map_client.txt)
      	Resource Packs: [faithful32pack.zip]
      	Current Language: English (US)
      	Profiler Position: N/A (disabled)
      	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
      

      You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-294053/16540251/

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              • Assignee:
                Unassigned
                Reporter:
                Hopper [Bot] Hopper
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                Dates

                • Created:
                  Updated:
                  Resolved:
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