I got this while doing a test of twitch servers, from the main menu, before loading a world.

-XX:CMSInitiatingOccupancyFraction=80 -XX:+ExplicitGCInvokesConcurrentAndUnloadsClasses -XX:InitialHeapSize=503316480 -XX:MaxHeapFreeRatio=25 -XX:MaxHeapSize=1677721600 -XX:MaxNewSize=419430400 -XX:MaxPermSize=262144000 -XX:MaxTenuringThreshold=4 -XX:MinHeapFreeRatio=22 -XX:NewSize=419430400 -XX:OldPLABSize=16 -XX:+PrintCommandLineFlags -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+PrintTenuringDistribution -XX:SoftRefLRUPolicyMSPerMB=1 -XX:SurvivorRatio=10 -XX:TargetSurvivorRatio=80 -XX:+UseCompressedOops -XX:+UseConcMarkSweepGC -XX:+UseParNewGC
[18:46:44] [Client thread/INFO]: Setting user: Keybounce
[18:46:44] [Client thread/INFO]: (Session ID is token:2a02e59605544b0b93c72f5b1165c2ae:dd246b71d2cf496c9fc7f968795fbea1)
[18:46:46] [Client thread/INFO]: LWJGL Version: 2.9.2
[18:46:47] [Client thread/INFO]: Reloading ResourceManager: Default
[18:46:47] [Sound Library Loader/INFO]: Starting up SoundSystem...
[18:46:47] [Thread-6/INFO]: Initializing LWJGL OpenAL
[18:46:47] [Thread-6/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[18:46:47] [Thread-6/INFO]: OpenAL initialized.
[18:46:47] [Sound Library Loader/INFO]: Sound engine started
[18:46:49] [Client thread/INFO]: Created: 512x512 textures-atlas
#

1. A fatal error has been detected by the Java Runtime Environment:
   #
2. SIGSEGV (0xb) at pc=0x00000001193e4073, pid=99089, tid=2823
   #
3. JRE version: Java(TM) SE Runtime Environment (7.0_72-b14) (build 1.7.0_72-b14)
4. Java VM: Java HotSpot(TM) 64-Bit Server VM (24.72-b04 mixed mode bsd-amd64 compressed oops)
5. Problematic frame:
6. C [libtwitchsdk.dylib+0x1b073] ttv::Streamer::GetStreamInfoCallback(TTV_ErrorCode, void*)+0x73
   #
7. Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
   #
8. An error report file with more information is saved as:
9. /Volumes/UserData/Users/michael/Documents/Games/Minecraft/Playing/Client/Vanilla/hs_err_pid99089.log
   #
10. If you would like to submit a bug report, please visit:
11. http://bugreport.sun.com/bugreport/crash.jsp
12. The crash happened outside the Java Virtual Machine in native code.
13. See problematic frame for where to report the bug.
    #
    /SourceCache/AppleGVA/AppleGVA-7.1.18/Sources/Slices/Driver/AVD_loader.cpp: failed to get a service for display 2
    ERR: Mon Feb 23 18:48:25 2015 - Socket - Error Sending from a socket. Error = 54
    ERR: Mon Feb 23 18:48:25 2015 - rtmp - RTMP Entered error state with error 44
    ERR: Mon Feb 23 18:48:25 2015 - Streamer - Inside Streamer::Start - Call to mFlvMuxer->Start(params) failed