minecraft 1.6.1 world hangs

Confirmed.
But don't know how reproduce, was a single issue:
Left a single player world, Minecraft hangs at the main menu.
After terminating the process the same exit code was reported.

Client> 2013-07-01 22:41:25 [SERVER] [INFO] Saving and pausing game...
Client> 2013-07-01 22:41:25 [SERVER] [INFO] Saving chunks for level 'MojiraTest'/Overworld
Client> 2013-07-01 22:41:25 [SERVER] [INFO] Saving chunks for level 'MojiraTest'/Nether
Client> 2013-07-01 22:41:25 [SERVER] [INFO] Saving chunks for level 'MojiraTest'/The End
Client> 2013-07-01 22:48:07 [SERVER] [INFO] Stopping server
Client> 2013-07-01 22:48:07 [SERVER] [INFO] Saving players
Client> 2013-07-01 22:48:07 [SERVER] [INFO] Kumasasa left the game
Client> 2013-07-01 22:48:07 [SERVER] [INFO] Saving worlds
Client> 2013-07-01 22:48:07 [SERVER] [INFO] Saving chunks for level 'MojiraTest'/Overworld
Client> 2013-07-01 22:48:07 [SERVER] [INFO] Saving chunks for level 'MojiraTest'/Nether
Client> 2013-07-01 22:48:07 [SERVER] [INFO] Saving chunks for level 'MojiraTest'/The End
Client> 2013-07-01 22:48:11 [CLIENT] [INFO] Connecting to localhost, 25565
Client> Setting up custom skins
Client> 2013-07-01 22:49:08 [CLIENT] [SEVERE] Reached end of stream for localhost/127.0.0.1
Game ended with bad state (exit code -805306369)

Edit: Seems to be unrelated.

The issue is the "[WARNING] Memory connection overburdened;" As the client just hangs, the longer you sit there, the bigger the to be processed number gets.

The exit code is from having to close the non-responsive client. I've tried allocating more memory via -Xmx2G command

was there some kind of world conversion going on from 1.5.2 to 1.6.1?

FYI, I would attach a world folder but the regions in the save file are over 100mb each

Client> 2013-07-01 14:46:18 [SERVER] [WARNING] Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-07-01 14:47:01 [CLIENT] [WARNING] Memory connection overburdened; after processing 2500 packets, we still have 2546 to go!

Can you upload that world to some 3rd party server and provide the link here ?

https://skydrive.live.com/redir?resid=AA0AD8B5B1BC431F!345&authkey=!AFEHSlsD6txiqZs

I've tried clearing some of the old texture pack to see if that was part of the issue but still no go on my end.

Confirmed with your world.
Seems to be related (or duplicate) of MC-12799.

You may have your world repaired at http://www.minecraftforum.net/topic/137381-official-corrupted-save-recovery-thread/

2013-07-05 10:09:54 [SERVER] [INFO] Starting integrated minecraft server version 1.6.1
2013-07-05 10:09:54 [SERVER] [INFO] Generating keypair
2013-07-05 10:09:54 [SERVER] [INFO] Preparing start region for level 0
loading single player
2013-07-05 10:09:55 [SERVER] [INFO] AJFire[/127.0.0.1:0] logged in with entity id 333 at (236.72482159980774, 64.0, 327.4935969834748)
2013-07-05 10:09:55 [SERVER] [INFO] AJFire joined the game
Setting up custom skins
2013-07-05 10:10:09 [SERVER] [INFO] Saving and pausing game...
2013-07-05 10:10:09 [SERVER] [INFO] Saving chunks for level 'Renes Welt'/Overworld
2013-07-05 10:10:09 [SERVER] [INFO] Saving chunks for level 'Renes Welt'/Nether
2013-07-05 10:10:09 [SERVER] [INFO] Saving chunks for level 'Renes Welt'/The End
2013-07-05 10:17:10 [CLIENT] [WARNING] Memory connection overburdened; after processing 2500 packets, we still have 4736 to go!
2013-07-05 10:17:10 [CLIENT] [WARNING] Memory connection overburdened; after processing 2500 packets, we still have 2256 to go!

Got the same error. I only use Ozo's Texture-pack and magic launcher. The same happens with vanilla.

Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

this happened to me too i turn" t out i was running the world in another window and it ran out of memory to run both windows if that does not work watch this video add more ram to your client hope this helps "link" ... http://www.youtube.com/watch?v=yG-GhI2BZ4c

I can confirm that this is an issue for me. Adding more ram seems to just delay the onset of the problem. I don't just get it at particular blocks. I did used to in one of my worlds from 1.5.2 (I think) but I get it now an worlds created in 1.6.1 and running 1.6.2.
The problem also occurs connected to another host over the LAN, in fact so far it seems more frequent for me.
I have had this problem on Xubuntu 12.04 (Linux 3.8.0) using OpenJDK 6 and 7 and Oracle 7.
When the freeze occurs I can unfreeze it by switching desktops (ctrl+alt+arrow) and then switching back but this makes the game almost unplayable if monsters are around.

@Simon Leonard:

• Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt) here.

• Please attach the complete output of the "Development console" of the launcher. CTRL-A, CTRL-C there, CTRL-V in the ticket.
  If the launcher closes after game start, please edit your profile and select at "Launcher visibility" "Hide launcher and reopen" or "Keep the launcher open"

Hi Kumasasa, I've attached the crash report and the development console output is below:

Launcher 1.2.1 (through bootstrap 4) started on linux...
Current time is Aug 5, 2013 1:14:52 PM
System.getProperty('os.name') == 'Linux'
System.getProperty('os.version') == '3.8.0-26-lowlatency'
System.getProperty('os.arch') == 'amd64'
System.getProperty('java.version') == '1.7.0_25'
System.getProperty('java.vendor') == 'Oracle Corporation'
System.getProperty('sun.arch.data.model') == '64'
Loaded 2 profile(s); selected 'MaxLittlemore'
Refreshing auth...
Logging in with access token
Delta time to compare resources: 7993 ms 
Download job 'Resources' skipped as there are no files to download
Job 'Resources' finished successfully
Getting syncinfo for selected version
Queueing library & version downloads
Download job 'Version & Libraries' started (8 threads, 19 files)
Finished downloading /home/username/.minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/com/google/code/gson/gson/2.2.2/gson-2.2.2.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.0/lwjgl-2.9.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/argo/argo/2.25_fixed/argo-2.25_fixed.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/net/sf/jopt-simple/jopt-simple/4.5/jopt-simple-4.5.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.0/lwjgl_util-2.9.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/net/java/jinput/jinput-platform/2.0.5/jinput-platform-2.0.5-natives-linux.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/commons-io/commons-io/2.4/commons-io-2.4.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/org/apache/commons/commons-lang3/3.1/commons-lang3-3.1.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/org/lwjgl/lwjgl/lwjgl-platform/2.9.0/lwjgl-platform-2.9.0-natives-linux.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/com/google/guava/guava/14.0/guava-14.0.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/org/bouncycastle/bcprov-jdk15on/1.47/bcprov-jdk15on-1.47.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar for job 'Version & Libraries': Used own copy as it matched etag
Finished downloading /home/username/.minecraft/versions/1.6.2/1.6.2.jar for job 'Version & Libraries': Used own copy as it matched etag
Job 'Version & Libraries' finished successfully
Launching game
Looking for old natives to clean up...
Unpacking natives to /home/username/.minecraft/versions/1.6.2/1.6.2-natives-7390861661280
Launching in /home/username/.minecraft
Running /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java -Xmx1G -Djava.library.path=/home/username/.minecraft/versions/1.6.2/1.6.2-natives-7390861661280 -cp /home/username/.minecraft/libraries/net/sf/jopt-simple/jopt-simple/4.5/jopt-simple-4.5.jar:/home/username/.minecraft/libraries/com/paulscode/codecjorbis/20101023/codecjorbis-20101023.jar:/home/username/.minecraft/libraries/com/paulscode/codecwav/20101023/codecwav-20101023.jar:/home/username/.minecraft/libraries/com/paulscode/libraryjavasound/20101123/libraryjavasound-20101123.jar:/home/username/.minecraft/libraries/com/paulscode/librarylwjglopenal/20100824/librarylwjglopenal-20100824.jar:/home/username/.minecraft/libraries/com/paulscode/soundsystem/20120107/soundsystem-20120107.jar:/home/username/.minecraft/libraries/argo/argo/2.25_fixed/argo-2.25_fixed.jar:/home/username/.minecraft/libraries/org/bouncycastle/bcprov-jdk15on/1.47/bcprov-jdk15on-1.47.jar:/home/username/.minecraft/libraries/com/google/guava/guava/14.0/guava-14.0.jar:/home/username/.minecraft/libraries/org/apache/commons/commons-lang3/3.1/commons-lang3-3.1.jar:/home/username/.minecraft/libraries/commons-io/commons-io/2.4/commons-io-2.4.jar:/home/username/.minecraft/libraries/net/java/jinput/jinput/2.0.5/jinput-2.0.5.jar:/home/username/.minecraft/libraries/net/java/jutils/jutils/1.0.0/jutils-1.0.0.jar:/home/username/.minecraft/libraries/com/google/code/gson/gson/2.2.2/gson-2.2.2.jar:/home/username/.minecraft/libraries/org/lwjgl/lwjgl/lwjgl/2.9.0/lwjgl-2.9.0.jar:/home/username/.minecraft/libraries/org/lwjgl/lwjgl/lwjgl_util/2.9.0/lwjgl_util-2.9.0.jar:/home/username/.minecraft/versions/1.6.2/1.6.2.jar net.minecraft.client.main.Main --username MaxLittlemore --session token:7e1299aa16334635a3ac0fee782a38c0:05a46d56659346d19dbdb12661298bcd --version 1.6.2 --gameDir /home/username/.minecraft --assetsDir /home/username/.minecraft/assets
Client> 2013-08-05 13:16:01 [CLIENT] [INFO] Setting user: MaxLittlemore
Client> 2013-08-05 13:16:01 [CLIENT] [INFO] (Session ID is token:7e1299aa16334635a3ac0fee782a38c0:05a46d56659346d19dbdb12661298bcd)
Client> 2013-08-05 13:16:03 [CLIENT] [INFO] LWJGL Version: 2.9.0
Client> 2013-08-05 13:16:05 [CLIENT] [INFO] Reloading ResourceManager: Default
Client> 
Client> Starting up SoundSystem...
Client> Initializing LWJGL OpenAL
Client>     (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.
Client> 
Client> 2013-08-05 13:16:40 [SERVER] [INFO] Starting integrated minecraft server version 1.6.2
Client> 2013-08-05 13:16:41 [SERVER] [INFO] Generating keypair
Client> 2013-08-05 13:16:42 [SERVER] [INFO] Preparing start region for level 0
Client> 2013-08-05 13:16:43 [SERVER] [INFO] Preparing spawn area: 14%
Client> 2013-08-05 13:16:44 [SERVER] [INFO] Preparing spawn area: 36%
Client> 2013-08-05 13:16:45 [SERVER] [INFO] Preparing spawn area: 89%
Client> loading single player
Client> 2013-08-05 13:16:46 [SERVER] [INFO] MaxLittlemore[/127.0.0.1:0] logged in with entity id 322 at (-184.03787406762257, 59.0, 253.45927329193802)
Client> 2013-08-05 13:16:46 [SERVER] [INFO] MaxLittlemore joined the game
Client> Setting up custom skins
Client> 2013-08-05 13:16:49 [SERVER] [WARNING] Can't keep up! Did the system time change, or is the server overloaded?
Client> 2013-08-05 13:19:18 [CLIENT] [WARNING] Memory connection overburdened; after processing 2500 packets, we still have 865 to go!
Client> u: Manually triggered debug crash
Client> 	at ats.k(SourceFile:1238)
Client> 	at ats.S(SourceFile:663)
Client> 	at ats.d(SourceFile:619)
Client> 	at net.minecraft.client.main.Main.main(SourceFile:101)
Client> Caused by: java.lang.Throwable
Client> 	... 4 more
Client> ---- Minecraft Crash Report ----
Client> // Surprise! Haha. Well, this is awkward.
Client> 
Client> Time: 5/08/13 1:19 PM
Client> Description: Manually triggered debug crash
Client> 
Client> java.lang.Throwable
Client> 	at ats.k(SourceFile:1238)
Client> 	at ats.S(SourceFile:663)
Client> 	at ats.d(SourceFile:619)
Client> 	at net.minecraft.client.main.Main.main(SourceFile:101)
Client> 
Client> 
Client> A detailed walkthrough of the error, its code path and all known details is as follows:
Client> ---------------------------------------------------------------------------------------
Client> 
Client> -- Affected level --
Client> Details:
Client> 	Level name: MpServer
Client> 	All players: 1 total; [bdf['MaxLittlemore'/322, l='MpServer', x=-170.11, y=69.62, z=254.19]]
Client> 	Chunk stats: MultiplayerChunkCache: 441
Client> 	Level seed: 0
Client> 	Level generator: ID 00 - default, ver 1. Features enabled: false
Client> 	Level generator options: 
Client> 	Level spawn location: World: (-180,64,256), Chunk: (at 12,4,0 in -12,16; contains blocks -192,0,256 to -177,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Client> 	Level time: 1348505 game time, 1444499 day time
Client> 	Level dimension: 0
Client> 	Level storage version: 0x00000 - Unknown?
Client> 	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Client> 	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Client> 	Forced entities: 127 total; [tv['Zombie'/36602, l='MpServer', x=-103.50, y=42.00, z=180.50], tv['Zombie'/36601, l='MpServer', x=-104.50, y=42.00, z=180.50], tq['Skeleton'/43457, l='MpServer', x=-232.50, y=45.00, z=176.50], tq['Skeleton'/45163, l='MpServer', x=-212.50, y=50.00, z=212.50], tq['Skeleton'/45162, l='MpServer', x=-212.50, y=50.00, z=213.50], te['Creeper'/51223, l='MpServer', x=-232.50, y=34.00, z=314.50], tq['Skeleton'/50913, l='MpServer', x=-148.50, y=17.00, z=194.50], te['Creeper'/51205, l='MpServer', x=-245.56, y=14.00, z=175.44], tv['Zombie'/25029, l='MpServer', x=-93.50, y=26.00, z=250.50], rn['Bat'/50888, l='MpServer', x=-116.50, y=37.24, z=249.50], tq['Skeleton'/50676, l='MpServer', x=-241.50, y=30.00, z=289.50], sb['Squid'/41086, l='MpServer', x=-111.56, y=60.97, z=272.50], tq['Skeleton'/27688, l='MpServer', x=-210.50, y=39.00, z=240.50], rn['Bat'/50905, l='MpServer', x=-213.75, y=42.00, z=210.25], rn['Bat'/50906, l='MpServer', x=-213.02, y=43.33, z=213.81], te['Creeper'/45144, l='MpServer', x=-93.50, y=36.00, z=190.50], te['Creeper'/45145, l='MpServer', x=-92.50, y=36.00, z=191.50], te['Creeper'/45142, l='MpServer', x=-98.09, y=38.00, z=186.53], te['Creeper'/45143, l='MpServer', x=-89.50, y=36.00, z=188.50], rn['Bat'/49888, l='MpServer', x=-238.71, y=20.23, z=263.56], ts['Spider'/17816, l='MpServer', x=-236.50, y=20.00, z=256.50], tq['Skeleton'/84, l='MpServer', x=-244.50, y=30.00, z=305.50], bdf['MaxLittlemore'/322, l='MpServer', x=-170.11, y=69.62, z=254.19], tq['Skeleton'/83, l='MpServer', x=-244.47, y=45.00, z=298.06], te['Creeper'/17803, l='MpServer', x=-248.50, y=54.00, z=283.50], rn['Bat'/22908, l='MpServer', x=-246.34, y=36.10, z=179.47], te['Creeper'/25020, l='MpServer', x=-244.50, y=62.00, z=324.50], rq['Cow'/96, l='MpServer', x=-230.44, y=70.00, z=286.50], rp['Chicken'/106, l='MpServer', x=-237.44, y=70.00, z=306.44], tv['Zombie'/119, l='MpServer', x=-214.28, y=50.00, z=235.06], sb['Squid'/28506, l='MpServer', x=-106.22, y=60.00, z=299.50], tv['Zombie'/120, l='MpServer', x=-215.16, y=50.00, z=228.56], rq['Cow'/136, l='MpServer', x=-181.19, y=59.00, z=265.31], rp['Chicken'/143, l='MpServer', x=-177.22, y=57.00, z=252.06], rp['Chicken'/142, l='MpServer', x=-176.61, y=62.52, z=247.30], ts['Spider'/129, l='MpServer', x=-204.50, y=69.00, z=245.88], tr['Slime'/128, l='MpServer', x=-196.69, y=30.01, z=182.31], rn['Bat'/131, l='MpServer', x=-193.25, y=37.10, z=270.66], tv['Zombie'/130, l='MpServer', x=-207.70, y=27.05, z=259.50], te['Creeper'/33182, l='MpServer', x=-247.50, y=55.00, z=282.50], rq['Cow'/133, l='MpServer', x=-194.76, y=59.00, z=260.23], te['Creeper'/132, l='MpServer', x=-196.50, y=35.00, z=263.06], rq['Cow'/135, l='MpServer', x=-184.09, y=59.00, z=260.41], rq['Cow'/134, l='MpServer', x=-185.75, y=59.00, z=265.53], rp['Chicken'/152, l='MpServer', x=-178.45, y=62.41, z=248.29], rp['Chicken'/153, l='MpServer', x=-177.37, y=62.51, z=249.70], rp['Chicken'/154, l='MpServer', x=-177.75, y=62.48, z=247.45], rp['Chicken'/155, l='MpServer', x=-175.73, y=62.43, z=248.68], rp['Chicken'/156, l='MpServer', x=-178.60, y=62.47, z=249.15], rp['Chicken'/157, l='MpServer', x=-176.81, y=62.50, z=249.74], rp['Chicken'/158, l='MpServer', x=-176.21, y=62.47, z=248.10], rp['Chicken'/159, l='MpServer', x=-176.61, y=62.54, z=247.75], tq['Skeleton'/37288, l='MpServer', x=-238.50, y=20.00, z=255.50], rp['Chicken'/144, l='MpServer', x=-176.65, y=62.48, z=248.59], tq['Skeleton'/37289, l='MpServer', x=-239.50, y=20.00, z=257.50], rp['Chicken'/145, l='MpServer', x=-177.94, y=62.58, z=249.19], rp['Chicken'/146, l='MpServer', x=-178.39, y=62.43, z=247.49], rp['Chicken'/147, l='MpServer', x=-177.13, y=62.45, z=246.45], te['Creeper'/37292, l='MpServer', x=-247.31, y=25.76, z=322.66], rp['Chicken'/148, l='MpServer', x=-178.34, y=62.49, z=249.83], te['Creeper'/37293, l='MpServer', x=-244.50, y=26.00, z=322.50], rp['Chicken'/149, l='MpServer', x=-176.86, y=62.51, z=249.10], tq['Skeleton'/37294, l='MpServer', x=-248.50, y=26.00, z=328.50], rp['Chicken'/150, l='MpServer', x=-178.98, y=62.51, z=248.17], tq['Skeleton'/31425, l='MpServer', x=-227.50, y=37.00, z=291.50], rp['Chicken'/151, l='MpServer', x=-177.85, y=62.60, z=248.73], te['Creeper'/36196, l='MpServer', x=-246.50, y=44.00, z=296.50], rp['Chicken'/171, l='MpServer', x=-177.79, y=62.51, z=250.22], te['Creeper'/39487, l='MpServer', x=-91.50, y=39.00, z=183.50], te['Creeper'/36197, l='MpServer', x=-245.50, y=44.00, z=296.50], rp['Chicken'/170, l='MpServer', x=-176.34, y=62.51, z=249.21], rp['Chicken'/169, l='MpServer', x=-175.44, y=57.00, z=252.91], rp['Chicken'/168, l='MpServer', x=-177.91, y=57.00, z=250.84], rq['Cow'/175, l='MpServer', x=-177.56, y=59.00, z=264.25], rq['Cow'/174, l='MpServer', x=-185.34, y=60.00, z=267.97], rq['Cow'/173, l='MpServer', x=-189.25, y=59.00, z=259.04], rq['Cow'/172, l='MpServer', x=-187.27, y=59.00, z=260.70], rp['Chicken'/163, l='MpServer', x=-174.84, y=57.00, z=252.91], rp['Chicken'/162, l='MpServer', x=-179.32, y=62.46, z=248.77], rp['Chicken'/161, l='MpServer', x=-177.92, y=62.45, z=248.09], tv['Zombie'/14268, l='MpServer', x=-194.59, y=35.00, z=271.94], rp['Chicken'/160, l='MpServer', x=-177.14, y=62.48, z=248.53], rp['Chicken'/167, l='MpServer', x=-177.20, y=62.52, z=247.46], rp['Chicken'/166, l='MpServer', x=-175.24, y=62.58, z=249.20], rp['Chicken'/165, l='MpServer', x=-172.25, y=57.00, z=250.38], rp['Chicken'/164, l='MpServer', x=-177.36, y=62.45, z=247.93], rn['Bat'/13291, l='MpServer', x=-189.31, y=40.10, z=268.50], te['Creeper'/184, l='MpServer', x=-184.59, y=50.00, z=277.00], rn['Bat'/13289, l='MpServer', x=-201.09, y=35.99, z=258.10], rq['Cow'/178, l='MpServer', x=-183.25, y=59.00, z=266.66], te['Creeper'/179, l='MpServer', x=-190.53, y=50.00, z=272.03], rq['Cow'/176, l='MpServer', x=-188.10, y=59.00, z=259.52], rq['Cow'/177, l='MpServer', x=-188.22, y=59.00, z=264.22], rq['Cow'/182, l='MpServer', x=-193.64, y=59.00, z=260.26], rq['Cow'/183, l='MpServer', x=-186.56, y=59.00, z=267.50], rq['Cow'/180, l='MpServer', x=-193.56, y=59.00, z=259.00], rq['Cow'/181, l='MpServer', x=-187.84, y=59.00, z=266.84], ts['Spider'/49226, l='MpServer', x=-211.50, y=43.00, z=285.50], rp['Chicken'/201, l='MpServer', x=-177.94, y=62.50, z=246.92], tq['Skeleton'/35147, l='MpServer', x=-98.41, y=40.00, z=289.94], rp['Chicken'/200, l='MpServer', x=-177.81, y=57.00, z=252.91], rp['Chicken'/202, l='MpServer', x=-176.69, y=57.00, z=252.91], rp['Chicken'/197, l='MpServer', x=-174.44, y=57.00, z=252.56], rp['Chicken'/196, l='MpServer', x=-175.34, y=57.00, z=251.88], rp['Chicken'/199, l='MpServer', x=-172.78, y=57.00, z=250.63], tv['Zombie'/40479, l='MpServer', x=-216.50, y=43.00, z=282.50], rp['Chicken'/198, l='MpServer', x=-175.94, y=57.00, z=252.84], rp['Chicken'/195, l='MpServer', x=-177.81, y=57.00, z=252.03], tr['Slime'/215, l='MpServer', x=-136.31, y=9.00, z=263.69], te['Creeper'/25924, l='MpServer', x=-238.50, y=28.00, z=305.50], rq['Cow'/210, l='MpServer', x=-145.19, y=85.00, z=319.94], tq['Skeleton'/50688, l='MpServer', x=-210.50, y=36.00, z=280.50], tq['Skeleton'/50690, l='MpServer', x=-209.20, y=38.58, z=281.31], tq['Skeleton'/50691, l='MpServer', x=-210.66, y=36.00, z=277.88], rn['Bat'/35183, l='MpServer', x=-245.68, y=30.49, z=176.96], rp['Chicken'/235, l='MpServer', x=-107.56, y=64.00, z=178.56], ry['Sheep'/234, l='MpServer', x=-104.94, y=66.00, z=178.88], tr['Slime'/227, l='MpServer', x=-115.31, y=35.00, z=261.38], ry['Sheep'/226, l='MpServer', x=-121.50, y=65.00, z=187.09], tv['Zombie'/40480, l='MpServer', x=-216.50, y=43.00, z=273.50], rn['Bat'/50713, l='MpServer', x=-206.31, y=42.44, z=289.51], ry['Sheep'/246, l='MpServer', x=-89.53, y=67.00, z=227.09], rp['Chicken'/244, l='MpServer', x=-91.47, y=71.00, z=207.34], ry['Sheep'/242, l='MpServer', x=-89.56, y=74.00, z=204.34], rp['Chicken'/243, l='MpServer', x=-93.47, y=73.00, z=197.47], rn['Bat'/35184, l='MpServer', x=-236.78, y=44.10, z=179.78], rn['Bat'/35187, l='MpServer', x=-234.97, y=29.75, z=321.10]]
Client> 	Retry entities: 0 total; []
Client> 	Server brand: vanilla
Client> 	Server type: Integrated singleplayer server
Client> Stacktrace:
Client> 	at bda.a(SourceFile:284)
Client> 	at ats.b(SourceFile:1761)
Client> 	at ats.d(SourceFile:628)
Client> 	at net.minecraft.client.main.Main.main(SourceFile:101)
Client> 
Client> -- System Details --
Client> Details:
Client> 	Minecraft Version: 1.6.2
Client> 	Operating System: Linux (amd64) version 3.8.0-26-lowlatency
Client> 	Java Version: 1.7.0_25, Oracle Corporation
Client> 	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
Client> 	Memory: 68742736 bytes (65 MB) / 314310656 bytes (299 MB) up to 954466304 bytes (910 MB)
Client> 	JVM Flags: 1 total; -Xmx1G
Client> 	AABB Pool Size: 10024 (561344 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Client> 	Suspicious classes: No suspicious classes found.
Client> 	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
Client> 	Launched Version: 1.6.2
Client> 	LWJGL: 2.9.0
Client> 	OpenGL: GeForce 8400M GS/PCIe/SSE2 GL version 3.3.0 NVIDIA 304.88, NVIDIA Corporation
Client> 	Is Modded: Probably not. Jar signature remains and client brand is untouched.
Client> 	Type: Client (map_client.txt)
Client> 	Resource Pack: Default
Client> 	Current Language: English (US)
Client> 	Profiler Position: N/A (disabled)
Client> 	Vec3 Pool Size: 1980 (110880 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used
Client> #@!@# Game crashed! Crash report saved to: #@!@# /home/username/.minecraft/crash-reports/crash-2013-08-05_13.19.31-client.txt
Client> AL lib: (EE) alc_cleanup: 1 device not closed
Client> #
Client> # A fatal error has been detected by the Java Runtime Environment:
Client> #
Client> #  SIGSEGV (0xb) at pc=0x0000000000000000, pid=5742, tid=139949229430528
Client> #
Client> # JRE version: 7.0_25-b30
Client> # Java VM: OpenJDK 64-Bit Server VM (23.7-b01 mixed mode linux-amd64 compressed oops)
Client> # Problematic frame:
Client> # C
Game ended with bad state (exit code 255)
Ignoring visibility rule and showing launcher due to a game crash
Deleting /home/username/.minecraft/versions/1.6.2/1.6.2-natives-7390861661280

Just for added background if it helps, the "Can't keep up!" message happens every time I start playing a world. The message at 13:19:18 was when game started locking up. I played until it did that before forcing the crash.

@Simon Leonard: Can you ZIP or 7Z upload your world here (if < 10 MB) or upload it to some 3rd party file hoster and provide the link here ?

10.09MB - so I guess that needs a hosting service... - http://www.mediafire.com/download/3z506cg1tkhb3zr/Farty_Smarmbarf.7z

@Simon Leonard: Cannot confrm. Your world loads quite normally without any lag, hang or freeze, see screenshot.

@Kumasasa I was wondering why you wanted to see the actual world. The freeze happens on every world I have as well as every world I have played online or on the LAN. It is not dependant on the world.

Have you tried running the game for 10 minutes on a Linux 3.8 / Java with 1 GB max ram? Ten minutes at 1200x800 should be long enough to encounter a freeze.

@Simon Leonard:
Well, apparently I didn't get your issue.

This ticket is about freezing specific worlds, not every world.

Have you tried running the game for 10 minutes on a Linux 3.8 / Java with 1 GB max ram?

No, don't have a running Linux machine, but 1GB RAM is way too less for Minecraft. Minimum system requirements are 2 GB, compare http://help.mojang.com/customer/portal/articles/325948-minecraft-system-requirements

Resolved as duplicate of MC-12799