Completely ignored arguments: [--nativeLauncherVersion, 286]
[19:00:59] [Client thread/INFO]: Setting user: sdotconnelly
[19:00:59] [Client thread/INFO]: (Session ID is token:c65292d3fdfc4064ad6e42fb34d12223:2d0cb253af5e4b41a4422793072bef5e)
[19:01:01] [Client thread/INFO]: LWJGL Version: 2.9.4
[19:01:01] [Client thread/INFO]: Reloading ResourceManager: Default
[19:01:01] [Sound Library Loader/INFO]: Starting up SoundSystem...
[19:01:02] [Thread-5/INFO]: Initializing LWJGL OpenAL
[19:01:02] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[19:01:02] [Thread-5/INFO]: OpenAL initialized.
[19:01:02] [Sound Library Loader/INFO]: Sound engine started
[19:01:03] [Client thread/INFO]: Created: 1024x512 textures-atlas
[19:01:10] [Server thread/INFO]: Starting integrated minecraft server version 15w42a
[19:01:10] [Server thread/INFO]: Generating keypair
[19:01:10] [Server thread/INFO]: Preparing start region for level 0
[19:01:11] [Server thread/INFO]: Preparing spawn area: 41%
[19:01:12] [Server thread/INFO]: Changing view distance to 6, from 10
[19:01:13] [Server thread/INFO]: sdotconnelly[local:E:4de88287] logged in with entity id 382 at (-105.96305908953242, 44.0, 227.30000001192093)
[19:01:13] [Server thread/INFO]: sdotconnelly joined the game
[19:01:13] [Server thread/INFO]: Saving and pausing game...
[19:01:13] [Server thread/INFO]: Saving chunks for level '10/12/2015'/Overworld
[19:01:13] [Server thread/INFO]: Saving chunks for level '10/12/2015'/Nether
[19:01:13] [Server thread/INFO]: Saving chunks for level '10/12/2015'/The End
#

1. A fatal error has been detected by the Java Runtime Environment:
   #
2. EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffa8cd1628c, pid=4384, tid=1864
   #
3. JRE version: Java(TM) SE Runtime Environment (8.0_25-b18) (build 1.8.0_25-b18)
4. Java VM: Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode windows-amd64 compressed oops)
5. Problematic frame:
6. C [ig75icd64.dll+0x55628c]
   #
7. Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
   #
8. An error report file with more information is saved as:
9. C:\Users\Sean\AppData\Roaming\.minecraft\hs_err_pid4384.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.
    #
    AL lib: (EE) alc_cleanup: 1 device not closed
    Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Whenever the world loads in the snapshot it crashes almost immediately.

Hope this helps in the development in 1.9