Ok um, so I just submitted an issue about the slimenado not working and it was resolved, so then when I went back to that world to kill the giant slime that kept spawning, I crashed, I killed all of the baby slimes, turned my head and crashed. The only thing that I can think of that I did between the time of the crashing and my submittance of the issue/the issue happening is checking out the 1.10 snapshots, which, by the way aren't working for me. I deleted those test worlds anyways so I have no idea what it could be. I'll attach the crash report.
Completely ignored arguments: [--nativeLauncherVersion, 301]
[12:56:38] [Client thread/INFO]: Setting user: CreeperMiner210
[12:56:39] [Client thread/INFO]: LWJGL Version: 2.9.4
[12:56:40] [Client thread/INFO]: Reloading ResourceManager: Default
[12:56:40] [Sound Library Loader/INFO]: Starting up SoundSystem...
[12:56:41] [Thread-5/INFO]: Initializing LWJGL OpenAL
[12:56:41] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[12:56:42] [Client thread/INFO]: Created: 1024x512 textures-atlas
[12:56:44] [Thread-5/INFO]: OpenAL initialized.
[12:56:44] [Sound Library Loader/INFO]: Sound engine started
[12:56:50] [Client thread/INFO]: Deleting level New World1_10dgfbvs
[12:56:50] [Client thread/INFO]: Attempt 1...
[12:56:53] [Client thread/INFO]: Deleting level New Worldtest1_10
[12:56:53] [Client thread/INFO]: Attempt 1...
[12:56:55] [Client thread/INFO]: Deleting level New World1_10
[12:56:55] [Client thread/INFO]: Attempt 1...
[12:56:57] [Server thread/INFO]: Starting integrated minecraft server version 1.9.4
[12:56:57] [Server thread/INFO]: Generating keypair
[12:56:57] [Server thread/INFO]: Preparing start region for level 0
[12:56:58] [Server thread/INFO]: Preparing spawn area: 17%
[12:56:59] [Server thread/INFO]: Preparing spawn area: 89%
[12:57:00] [Server thread/INFO]: Changing view distance to 12, from 10
[12:57:01] [Server thread/INFO]: CreeperMiner210[local:E:53823ed9] logged in with entity id 449 at (-878.2971246196397, 70.90779718977033, -1763.300000011921)
[12:57:01] [Server thread/INFO]: CreeperMiner210 joined the game
[12:57:04] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2344ms behind, skipping 46 tick(s)
[12:57:04] [Server thread/INFO]: Saving and pausing game...
[12:57:04] [Server thread/INFO]: Saving chunks for level 'Return to Mushroom Planet 1'/Overworld
[12:57:05] [Server thread/INFO]: Saving chunks for level 'Return to Mushroom Planet 1'/Nether
[12:57:05] [Server thread/INFO]: Saving chunks for level 'Return to Mushroom Planet 1'/The End
[12:57:07] [Client thread/WARN]: Received passengers for unknown entity
[12:57:14] [Client thread/INFO]: Warning: Clientside chunk ticking took 318 ms
[12:57:14] [Client thread/ERROR]: ########## GL ERROR ##########
[12:57:14] [Client thread/ERROR]: @ Post render
[12:57:14] [Client thread/ERROR]: 1282: Invalid operation
#

1. A fatal error has been detected by the Java Runtime Environment:
   #
2. EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000005a3d7d63, pid=3404, tid=2812
   #
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 [ig4icd64.dll+0x137d63]
   #
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\Kids\AppData\Roaming\.minecraft\hs_err_pid3404.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