Minecraft vanilla crashes on world load? [duplicate]

For about 2 weeks now my copy of Minecraft crashes on world load/create. The launcher starts correctly but when I click Singleplayer and load a world (or create one) it freezes on generating terrain and crashes.

I've tried deleting everything under the .minecraft folder, reinstalling java, nothing works.

Crash report (pastebin): Click here

If it doesn't work here's the crash report:

---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 3/06/15 09:37 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$1.b(SourceFile:41)
    at no.c(SourceFile:10)
    at ll.a(SourceFile:121)
    at ave.a(SourceFile:1941)
    at axb.a(SourceFile:210)
    at axu.a(SourceFile:350)
    at axb.a(SourceFile:350)
    at axu.k(SourceFile:413)
    at axu.p(SourceFile:390)
    at ave.s(SourceFile:1497)
    at ave.av(SourceFile:888)
    at ave.a(SourceFile:325)
    at net.minecraft.client.main.Main.main(SourceFile:124)
Caused by: io.netty.channel.ChannelException: failed to open a new selector
    at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
    at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
    at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
    at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:64)
    ... 17 more
Caused by: java.io.IOException: Unable to establish loopback connection
    at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:101)
    at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:68)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.nio.ch.PipeImpl.<init>(PipeImpl.java:170)
    at sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
    at java.nio.channels.Pipe.open(Pipe.java:155)
    at sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:127)
    at sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
    at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
    ... 20 more
Caused by: java.net.ConnectException: Connection timed out: connect
    at sun.nio.ch.Net.connect0(Native Method)
    at sun.nio.ch.Net.connect(Net.java:457)
    at sun.nio.ch.Net.connect(Net.java:449)
    at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:647)
    at java.nio.channels.SocketChannel.open(SocketChannel.java:189)
    at sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:130)
    at sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:83)
    ... 28 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:1941)
    at axb.a(SourceFile:210)
    at axu.a(SourceFile:350)
    at axb.a(SourceFile:350)
    at axu.k(SourceFile:413)
    at axu.p(SourceFile:390)

-- Affected screen --
Details:
    Screen name: aya
Stacktrace:
    at ave.s(SourceFile:1497)
    at ave.av(SourceFile:888)
    at ave.a(SourceFile:325)
    at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
    Minecraft Version: 1.8.6
    Operating System: Windows 8.1 (amd64) version 6.3
    CPU: 2x Intel(R) Celeron(R) CPU 847 @ 1.10GHz
    Java Version: 1.8.0_25, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 125741144 bytes (119 MB) / 336470016 bytes (320 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: 0, tcache: 0, allocated: 13, tallocated: 95
    Launched Version: 1.8.6
    LWJGL: 2.9.4
    OpenGL: Intel(R) HD Graphics GL version 3.1.0 - Build 9.17.10.3517, Intel
    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)