keeps crashing when i load some chunks

it used to be fine... now it crashes
[12:23:33] [Client thread/INFO]: Setting user: Delia_Smith
[12:23:33] [Client thread/INFO]: (Session ID is token:f542d76d2f044b04a2cdd4f48c28b1b0:9adcc9dd6341432f8943d01d47a141e3)
[12:23:36] [Client thread/INFO]: LWJGL Version: 2.9.4
[12:23:40] [Client thread/INFO]: Reloading ResourceManager: Default, lwnixonm - Copy (3)
[12:23:41] [Sound Library Loader/INFO]: Starting up SoundSystem...
[12:23:41] [Thread-6/INFO]: Initializing LWJGL OpenAL
[12:23:41] [Thread-6/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[12:23:54] [Thread-6/INFO]: OpenAL initialized.
[12:23:54] [Sound Library Loader/INFO]: Sound engine started
[12:24:02] [Client thread/INFO]: Created: 512x512 textures-atlas
[12:24:12] [Server thread/INFO]: Starting integrated minecraft server version 15w34d
[12:24:12] [Server thread/INFO]: Generating keypair
[12:24:12] [Server thread/INFO]: Preparing start region for level 0
[12:24:13] [Server thread/INFO]: Preparing spawn area: 48%
[12:24:14] [Server thread/INFO]: Changing view distance to 16, from 10
[12:24:15] [Server thread/INFO]: Delia_Smith[local:E:f76fe102] logged in with entity id 24 at (-633.8547899909406, 60.64202250660054, 744.4419005278409)
[12:24:15] [Server thread/INFO]: Delia_Smith joined the game
[12:24:17] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2393ms behind, skipping 47 tick(s)
[12:24:40] [Server thread/INFO]: Saving and pausing game...
[12:24:40] [Server thread/INFO]: Saving chunks for level 'Granny Wars'/Overworld
[12:24:40] [Server thread/INFO]: Saving chunks for level 'Granny Wars'/Nether
[12:24:40] [Server thread/INFO]: Saving chunks for level 'Granny Wars'/The End
[12:24:41] [Client thread/INFO]: [CHAT] Command set: /tellraw @a {text:"First you need some money...",color=dark_green}
#

1. A fatal error has been detected by the Java Runtime Environment:
   #

2. EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000000060ab4cdb, pid=2588, tid=5404
   #

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. V [jvm.dll+0x214cdb]
   #

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\Lucas\AppData\Roaming\.minecraft\hs_err_pid2588.log
   Compiled method (c1) 71096 8775 ! 3 bmt::c (72 bytes)
   total in heap [0x00000000031a1b50,0x00000000031a2eb0] = 4960
   relocation [0x00000000031a1c70,0x00000000031a1d58] = 232
   main code [0x00000000031a1d60,0x00000000031a2800] = 2720
   stub code [0x00000000031a2800,0x00000000031a2908] = 264
   oops [0x00000000031a2908,0x00000000031a2910] = 8
   metadata [0x00000000031a2910,0x00000000031a2948] = 56
   scopes data [0x00000000031a2948,0x00000000031a2bf0] = 680
   scopes pcs [0x00000000031a2bf0,0x00000000031a2db0] = 448
   dependencies [0x00000000031a2db0,0x00000000031a2dc0] = 16
   handler table [0x00000000031a2dc0,0x00000000031a2e50] = 144
   nul chk table [0x00000000031a2e50,0x00000000031a2eb0] = 96
   #

10. If you would like to submit a bug report, please visit:

11. http://bugreport.sun.com/bugreport/crash.jsp
    #
    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