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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.
      • This error also occurs when Java tries to open a socket on the IPv6 stack, but could't get a connection to the outside world. Try forcing the use of the IPv4 stack by adding @-Djava.net.preferIPv4Stack=true@ to the launch options.


      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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                Unassigned
                Reporter:
                Hopper [Bot] Hopper
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                Dates

                • Created:
                  Updated:
                  Resolved:
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