Minecraft crashes in nether

Every time I go to the nether with this snapshot, and go into a certain area, the game crashes!

ryan@ryan ~/.minecraft/bin $ java -Xmx1024M -Xms512M -cp minecraft_launcher.jar net.minecraft.LauncherFrame
asdf
27 achievements
219 recipes
Setting user: intel_ix, 45c462f0d560b8c8373a4e3b533c1ef7ead8a88b
LWJGL Version: 2.4.2

Starting up SoundSystem...
Initializing LWJGL OpenAL
(The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
OpenAL initialized.

Jan 4, 2013 1:05:34 PM ben c
INFO: Starting integrated minecraft server version 13w01b
Jan 4, 2013 1:05:34 PM ben c
INFO: Generating keypair
Jan 4, 2013 1:05:34 PM net.minecraft.server.MinecraftServer e
INFO: Preparing start region for level 0
Jan 4, 2013 1:05:35 PM gm a
INFO: intel_ix/127.0.0.1:0 logged in with entity id 215 at (17.66821132953386, 39.0, 217.01809632835966)
Jan 4, 2013 1:05:37 PM ben q
INFO: Saving and pausing game...
Jan 4, 2013 1:05:37 PM net.minecraft.server.MinecraftServer a
INFO: Saving chunks for level '(MAIN) Snow Village'/Overworld
Jan 4, 2013 1:05:37 PM net.minecraft.server.MinecraftServer a
INFO: Saving chunks for level '(MAIN) Snow Village'/Nether
Jan 4, 2013 1:05:37 PM net.minecraft.server.MinecraftServer a
INFO: Saving chunks for level '(MAIN) Snow Village'/The End
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1. A fatal error has been detected by the Java Runtime Environment:
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2. SIGSEGV (0xb) at pc=0x0000000000000000, pid=6505, tid=140653270144768
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3. JRE version: 6.0_24-b24

4. Java VM: OpenJDK 64-Bit Server VM (20.0-b12 mixed mode linux-amd64 compressed oops)

5. Derivative: IcedTea6 1.11.5

6. Distribution: Ubuntu 11.04, package 6b24-1.11.5-0ubuntu1~11.04.1

7. Problematic frame:

8. C 0x0000000000000000
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9. An error report file with more information is saved as:

10. /srv/alt-disk-mnt/srv/ryan-sync2/hidden/.minecraft/bin/hs_err_pid6505.log
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11. If you would like to submit a bug report, please include

12. instructions how to reproduce the bug and visit:

13. https://bugs.launchpad.net/ubuntu/+source/openjdk-6/
    #
    Aborted