IllegalStateException::Entity is already tracked!

This just started to happen to me too right after I had updated to 1.4.2 and it is very frustrating please fix this

hi! i have the same issue. before the 1.4.2, ut i don't remember.

here is the crash report:

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 25/10/12 15:50
Description: Exception in server tick loop

java.lang.IllegalStateException: Entity is already tracked!
	at hz.a(SourceFile:67)
	at hz.a(SourceFile:45)
	at ia.a(SourceFile:24)
	at xe.a(SourceFile:786)
	at ie.a(SourceFile:553)
	at xe.d(SourceFile:778)
	at ge.a(SourceFile:355)
	at lb.b(SourceFile:1442)
	at alc.a(SourceFile:62)
	at lb.D(SourceFile:659)
	at lb.d(SourceFile:622)
	at pg.j_(SourceFile:69)
	at xe.a(SourceFile:1218)
	at ie.a(SourceFile:424)
	at xe.g(SourceFile:1197)
	at xe.h(SourceFile:1122)
	at ie.h(SourceFile:352)
	at net.minecraft.server.MinecraftServer.r(SourceFile:718)
	at net.minecraft.server.MinecraftServer.q(SourceFile:661)
	at bcb.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:595)
	at fp.run(SourceFile:818)

Relevant Details:
- Minecraft Version: 1.4.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.6.0_29, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
- Memory: 280193600 bytes (267 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- AABB Pool Size: 2194 (122864 bytes; 0 MB) allocated, 2005 (112280 bytes; 0 MB) used
- Is Modded: Probably not
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: 653 (36568 bytes; 0 MB) allocated, 164 (9184 bytes; 0 MB) used
- Player Count: 1 / 8; [ih['fjordbokna'/172, l='New World--', x=100,00, y=49,00, z=0,00]]
- World New World-- Entities: 96 total; [pm['Toudou'/7785, l='New World--', x=98,50, y=60,00, z=1,50], pm['Toudou'/7786, l='New World--', x=96,50, y=60,00, z=8,50], pm['Toudou'/7787, l='New World--', x=98,50, y=60,00, z=4,41], pm['Toudou'/7788, l='New World--', x=98,25, y=61,00, z=5,27], ih['fjordbokna'/172, l='New World--', x=100,00, y=49,00, z=0,00], pm['Toudou'/7792, l='New World--', x=-18,57, y=59,00, z=-44,89], pm['Toudou'/7796, l='New World--', x=-15,50, y=59,00, z=-53,50], pm['Toudou'/7797, l='New World--', x=-7,50, y=59,00, z=-48,50], pm['Toudou'/7798, l='New World--', x=-7,50, y=59,00, z=-50,50], pm['Toudou'/7799, l='New World--', x=-8,50, y=59,00, z=-53,77], pm['Toudou'/7800, l='New World--', x=-8,50, y=59,00, z=-52,50], pm['Toudou'/7801, l='New World--', x=-8,50, y=59,00, z=-51,50], pm['Toudou'/7802, l='New World--', x=-10,71, y=59,00, z=-50,89], pm['Toudou'/7805, l='New World--', x=14,62, y=61,00, z=-50,00], pm['Toudou'/7806, l='New World--', x=10,38, y=60,00, z=-59,36], pm['Toudou'/7807, l='New World--', x=14,46, y=60,00, z=-58,44], pm['Toudou'/7808, l='New World--', x=8,64, y=60,00, z=-51,95], pm['Toudou'/7809, l='New World--', x=5,69, y=59,00, z=-56,90], pm['Toudou'/7810, l='New World--', x=5,50, y=59,00, z=-52,50], pm['Toudou'/7811, l='New World--', x=9,88, y=63,00, z=-8,35], pm['Toudou'/7812, l='New World--', x=12,38, y=65,00, z=47,10], pm['Toudou'/7813, l='New World--', x=16,53, y=58,00, z=-82,29], pm['Toudou'/7814, l='New World--', x=28,26, y=60,00, z=-68,05], pm['Toudou'/7815, l='New World--', x=25,47, y=59,00, z=-69,55], pm['Toudou'/7816, l='New World--', x=28,80, y=64,00, z=-0,63], pm['Toudou'/7817, l='New World--', x=29,79, y=64,00, z=0,76], pm['Toudou'/7818, l='New World--', x=31,14, y=64,00, z=25,50], pm['Toudou'/7819, l='New World--', x=27,50, y=63,00, z=63,50], pm['Toudou'/7820, l='New World--', x=29,50, y=63,00, z=60,50], pm['Toudou'/7821, l='New World--', x=23,41, y=63,00, z=64,33], pm['Toudou'/7822, l='New World--', x=32,50, y=60,00, z=-68,50], pm['Toudou'/7823, l='New World--', x=33,50, y=60,00, z=-66,50], pm['Toudou'/7824, l='New World--', x=38,60, y=62,00, z=-25,53], pm['Toudou'/7825, l='New World--', x=43,70, y=61,00, z=-26,27], pm['Toudou'/7826, l='New World--', x=44,06, y=62,00, z=-10,71], pm['Toudou'/7827, l='New World--', x=37,45, y=65,00, z=6,90], pm['Toudou'/7828, l='New World--', x=46,75, y=62,00, z=46,98], pm['Toudou'/7829, l='New World--', x=52,61, y=58,00, z=-61,41], pm['Toudou'/7830, l='New World--', x=51,50, y=58,00, z=-62,50], pm['Toudou'/7831, l='New World--', x=53,04, y=60,00, z=-32,16], pm['Toudou'/7832, l='New World--', x=54,83, y=60,00, z=-33,86], pm['Toudou'/7833, l='New World--', x=59,50, y=60,00, z=-37,50], pm['Toudou'/7834, l='New World--', x=52,65, y=60,00, z=-34,49], pm['Toudou'/7835, l='New World--', x=63,56, y=60,00, z=-19,63], pm['Toudou'/7836, l='New World--', x=57,70, y=59,00, z=-28,87], pm['Toudou'/7837, l='New World--', x=63,90, y=60,00, z=-16,31], pm['Toudou'/7838, l='New World--', x=53,94, y=60,00, z=-25,44], pm['Toudou'/7839, l='New World--', x=51,18, y=63,00, z=-3,96], pm['Toudou'/7840, l='New World--', x=54,48, y=61,00, z=-13,62], pg['item.tile.stonebrick'/7841, l='New World--', x=100,00, y=50,13, z=0,00], pg['item.tile.stonebrick'/7842, l='New World--', x=60,88, y=64,13, z=-0,26], pg['item.tile.stonebrick'/7843, l='New World--', x=60,95, y=64,13, z=-1,17], pg['item.tile.stonebrick'/7844, l='New World--', x=60,63, y=64,13, z=-1,69], pg['item.tile.stonebrick'/7845, l='New World--', x=62,99, y=64,13, z=-0,36], pg['item.tile.stonebrick'/7846, l='New World--', x=62,88, y=64,13, z=-2,83], pg['item.tile.stonebrick'/7847, l='New World--', x=62,42, y=64,13, z=-0,35], pm['Toudou'/7848, l='New World--', x=48,16, y=64,00, z=-1,20], pg['item.tile.stonebrick'/7849, l='New World--', x=62,41, y=64,13, z=-1,40], pm['Toudou'/7850, l='New World--', x=54,51, y=65,00, z=10,60], pm['Toudou'/7851, l='New World--', x=54,62, y=65,00, z=14,88], pg['item.tile.stonebrick'/7852, l='New World--', x=60,69, y=64,13, z=1,13], pg['item.tile.stonebrick'/7853, l='New World--', x=60,62, y=64,13, z=0,66], pg['item.tile.stonebrick'/7854, l='New World--', x=59,45, y=64,13, z=0,21], pg['item.tile.stonebrick'/7855, l='New World--', x=62,21, y=64,13, z=0,26], pm['Toudou'/7856, l='New World--', x=49,58, y=65,00, z=13,99], pg['item.tile.stonebrick'/7857, l='New World--', x=63,24, y=64,13, z=0,13], pm['Toudou'/7858, l='New World--', x=79,49, y=61,00, z=-5,78], pm['Toudou'/7859, l='New World--', x=74,06, y=63,00, z=19,67], pm['Toudou'/7860, l='New World--', x=76,54, y=62,00, z=16,89], pm['Toudou'/7861, l='New World--', x=77,50, y=58,00, z=91,50], pm['Toudou'/7862, l='New World--', x=79,10, y=58,00, z=90,39], pm['Toudou'/7863, l='New World--', x=90,53, y=49,00, z=-82,39], pm['Toudou'/7864, l='New World--', x=83,29, y=31,00, z=-61,70], pm['Toudou'/7865, l='New World--', x=95,65, y=57,00, z=-43,91], pm['Toudou'/7866, l='New World--', x=87,07, y=58,00, z=-30,39], pm['Toudou'/7867, l='New World--', x=85,40, y=62,00, z=12,88], pm['Toudou'/7868, l='New World--', x=91,10, y=62,00, z=24,30], pm['Toudou'/7869, l='New World--', x=85,23, y=62,00, z=26,30], pm['Toudou'/7870, l='New World--', x=89,50, y=62,00, z=24,50], pm['Toudou'/7871, l='New World--', x=87,76, y=62,00, z=32,52], pm['Toudou'/7872, l='New World--', x=108,50, y=37,00, z=-73,50], pm['Toudou'/7873, l='New World--', x=98,53, y=57,00, z=-37,33], pm['Toudou'/7874, l='New World--', x=110,64, y=60,00, z=31,75], pm['Toudou'/7875, l='New World--', x=111,78, y=59,00, z=59,56], pm['Toudou'/7876, l='New World--', x=124,54, y=50,00, z=-51,61], pm['Toudou'/7877, l='New World--', x=116,24, y=51,00, z=-53,18], pm['Toudou'/7878, l='New World--', x=122,26, y=51,00, z=-52,30], pm['Toudou'/7879, l='New World--', x=119,55, y=59,00, z=-39,39], pm['Toudou'/7880, l='New World--', x=125,74, y=50,00, z=-26,23], pm['Toudou'/7881, l='New World--', x=136,59, y=49,00, z=-51,27], pm['Toudou'/7882, l='New World--', x=133,21, y=49,00, z=-43,74], pm['Toudou'/7883, l='New World--', x=136,50, y=39,00, z=41,50], pm['Toudou'/7884, l='New World--', x=143,50, y=57,00, z=66,50], pm['Toudou'/7885, l='New World--', x=143,08, y=57,00, z=64,13], pm['Toudou'/7886, l='New World--', x=132,38, y=49,00, z=74,99], pg['item.tile.stonebrick'/7841, l='New World--', x=100,00, y=50,13, z=0,00]]
- World New World-- Players: 1 total; [ih['fjordbokna'/172, l='New World--', x=100,00, y=49,00, z=0,00]]
- World New World-- Chunk Stats: ServerChunkCache: 442 Drop: 0
- Type: Integrated Server

I also had this problem and managed to work around it.

I'm not sure if this will help in your case but here is what I did to get the End working in 1.4

With my server running 1.3.2 as before the update I went through the end portal. On the other side i managed to pick up 12 zombie flesh as soon as i spawn on the obsidian. I wandered out into the End and found a good spot to log out.

Then I updated to 1.4.2 and logged on to find myself standing in the End. I was able to exit and enter as I pleased from that point on.

I'm thinking that my issue might have had something to do with the zombie flesh that must have been dropped on the spawning pad.

Got the same issue in OSX heres the report:

Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem; Exception in server tick loop
This error has been saved to /Users/Colin/Library/Application Support/minecraft/crash-reports/crash-2012-10-31_17.45.57-server.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT 9eb7debf --------
Generated 10/31/12 5:46 PM

- Minecraft Version: 1.4.2
- Operating System: Mac OS X (i386) version 10.7.5
- Java Version: 1.6.0_37, Apple Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Apple Inc.
- Memory: 418797256 bytes (399 MB) / 550305792 bytes (524 MB) up to 1070399488 bytes (1020 MB)
- JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
- AABB Pool Size: 7131 (399336 bytes; 0 MB) allocated, 5166 (289296 bytes; 0 MB) used
- Is Modded: Probably not
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: 766 (42896 bytes; 0 MB) allocated, 521 (29176 bytes; 0 MB) used
- Player Count: 1 / 8; [ih['colinmon22'/524, l='VILLAGE WORLD', x=100.00, y=49.00, z=0.00]]
- World VILLAGE WORLD Entities: 81 total; [pm['Enderman'/112118, l='VILLAGE WORLD', x=99.56, y=57.00, z=3.45], pm['Enderman'/112119, l='VILLAGE WORLD', x=102.50, y=57.00, z=6.50], ih['colinmon22'/524, l='VILLAGE WORLD', x=100.00, y=49.00, z=0.00], pm['Enderman'/112120, l='VILLAGE WORLD', x=97.71, y=57.00, z=-5.48], pm['Enderman'/112121, l='VILLAGE WORLD', x=-59.61, y=58.00, z=-28.11], pm['Enderman'/112122, l='VILLAGE WORLD', x=-49.58, y=60.00, z=-3.20], pm['Enderman'/112123, l='VILLAGE WORLD', x=-53.97, y=59.00, z=-9.21], pm['Enderman'/112125, l='VILLAGE WORLD', x=-50.69, y=61.00, z=29.47], pm['Enderman'/112126, l='VILLAGE WORLD', x=-52.52, y=61.00, z=31.91], pm['Enderman'/112127, l='VILLAGE WORLD', x=-55.34, y=60.00, z=37.16], pm['Enderman'/112128, l='VILLAGE WORLD', x=-61.50, y=60.00, z=37.50], pm['Enderman'/112129, l='VILLAGE WORLD', x=-60.50, y=60.00, z=33.50], pm['Enderman'/112130, l='VILLAGE WORLD', x=-49.50, y=25.00, z=66.50], pm['Enderman'/112131, l='VILLAGE WORLD', x=-36.75, y=37.00, z=-97.93], pm['Enderman'/112132, l='VILLAGE WORLD', x=-47.61, y=38.00, z=-67.87], pm['Enderman'/112133, l='VILLAGE WORLD', x=-42.88, y=50.00, z=-50.46], pm['Enderman'/112134, l='VILLAGE WORLD', x=-32.01, y=61.00, z=-9.63], pm['Enderman'/112135, l='VILLAGE WORLD', x=-45.50, y=61.00, z=5.50], pm['Enderman'/112136, l='VILLAGE WORLD', x=-45.50, y=56.00, z=62.50], pm['Enderman'/112137, l='VILLAGE WORLD', x=-38.50, y=40.00, z=82.50], pm['Enderman'/112138, l='VILLAGE WORLD', x=-37.50, y=40.00, z=85.50], pm['Enderman'/112146, l='VILLAGE WORLD', x=-11.98, y=59.00, z=-24.63], pm['Enderman'/112147, l='VILLAGE WORLD', x=-7.14, y=60.00, z=-0.92], lj['Experience Orb'/112148, l='VILLAGE WORLD', x=100.00, y=50.13, z=0.00], lj['Experience Orb'/112149, l='VILLAGE WORLD', x=-2.64, y=66.15, z=-4.52], pm['Enderman'/112150, l='VILLAGE WORLD', x=-11.51, y=58.00, z=38.44], pm['Enderman'/112151, l='VILLAGE WORLD', x=-10.21, y=58.00, z=37.34], pm['Enderman'/112152, l='VILLAGE WORLD', x=-10.50, y=45.00, z=96.50], pm['Enderman'/112153, l='VILLAGE WORLD', x=3.50, y=40.00, z=-103.50], pm['Enderman'/112154, l='VILLAGE WORLD', x=0.12, y=51.00, z=-82.50], pm['Enderman'/112155, l='VILLAGE WORLD', x=12.41, y=88.00, z=-19.06], pm['Enderman'/112156, l='VILLAGE WORLD', x=9.74, y=60.00, z=-13.56], pm['Enderman'/112157, l='VILLAGE WORLD', x=12.65, y=88.00, z=-14.06], lj['Experience Orb'/112158, l='VILLAGE WORLD', x=6.53, y=60.25, z=2.16], pm['Enderman'/112159, l='VILLAGE WORLD', x=1.35, y=59.00, z=28.59], pm['Enderman'/112160, l='VILLAGE WORLD', x=5.14, y=58.00, z=76.68], pm['Enderman'/112161, l='VILLAGE WORLD', x=14.46, y=58.00, z=75.70], pm['Enderman'/112162, l='VILLAGE WORLD', x=13.66, y=57.00, z=69.90], pm['Enderman'/112163, l='VILLAGE WORLD', x=14.23, y=57.00, z=66.33], pm['Enderman'/112164, l='VILLAGE WORLD', x=20.73, y=60.00, z=-11.25], pm['Enderman'/112165, l='VILLAGE WORLD', x=27.32, y=60.00, z=39.79], pm['Enderman'/112166, l='VILLAGE WORLD', x=34.57, y=58.00, z=-55.84], pm['Enderman'/112167, l='VILLAGE WORLD', x=42.98, y=59.00, z=-21.60], pm['Enderman'/112168, l='VILLAGE WORLD', x=40.54, y=60.00, z=-7.00], pm['Enderman'/112169, l='VILLAGE WORLD', x=41.59, y=59.00, z=-13.15], pm['Enderman'/112170, l='VILLAGE WORLD', x=39.58, y=60.00, z=-0.98], pm['Enderman'/112171, l='VILLAGE WORLD', x=33.47, y=60.00, z=-7.93], pm['Enderman'/112172, l='VILLAGE WORLD', x=35.39, y=60.00, z=47.69], pm['Enderman'/112173, l='VILLAGE WORLD', x=38.09, y=60.00, z=43.54], pm['Enderman'/112174, l='VILLAGE WORLD', x=53.93, y=57.00, z=-61.58], pm['Enderman'/112175, l='VILLAGE WORLD', x=56.46, y=58.00, z=-49.52], pm['Enderman'/112176, l='VILLAGE WORLD', x=61.41, y=59.00, z=29.58], pm['Enderman'/112177, l='VILLAGE WORLD', x=62.80, y=59.00, z=29.47], pm['Enderman'/112178, l='VILLAGE WORLD', x=55.87, y=59.00, z=43.78], pm['Enderman'/112179, l='VILLAGE WORLD', x=59.99, y=58.00, z=61.27], pm['Enderman'/112180, l='VILLAGE WORLD', x=77.50, y=49.00, z=-68.50], pm['Enderman'/112181, l='VILLAGE WORLD', x=77.84, y=58.00, z=29.06], pm['Enderman'/112182, l='VILLAGE WORLD', x=68.44, y=59.00, z=33.10], pm['Enderman'/112183, l='VILLAGE WORLD', x=72.29, y=59.00, z=32.22], pm['Enderman'/112184, l='VILLAGE WORLD', x=67.36, y=59.00, z=36.41], pm['Enderman'/112185, l='VILLAGE WORLD', x=67.60, y=59.00, z=33.92], pm['Enderman'/112186, l='VILLAGE WORLD', x=77.21, y=58.00, z=52.75], pm['Enderman'/112187, l='VILLAGE WORLD', x=73.66, y=46.00, z=78.11], pm['Enderman'/112188, l='VILLAGE WORLD', x=71.37, y=45.00, z=78.73], ox['entity.EnderCrystal.name'/112189, l='VILLAGE WORLD', x=89.50, y=66.00, z=-48.50], pm['Enderman'/112190, l='VILLAGE WORLD', x=82.62, y=58.00, z=-22.94], pm['Enderman'/112191, l='VILLAGE WORLD', x=84.50, y=57.00, z=-15.50], pm['Enderman'/112192, l='VILLAGE WORLD', x=81.57, y=58.00, z=-15.28], pm['Enderman'/112193, l='VILLAGE WORLD', x=85.50, y=57.00, z=-12.50], pm['Enderman'/112194, l='VILLAGE WORLD', x=80.36, y=57.00, z=43.42], pm['Enderman'/112195, l='VILLAGE WORLD', x=83.23, y=58.00, z=35.30], pm['Enderman'/112196, l='VILLAGE WORLD', x=96.50, y=57.00, z=16.50], pm['Enderman'/112197, l='VILLAGE WORLD', x=97.71, y=57.00, z=19.40], pm['Enderman'/112198, l='VILLAGE WORLD', x=100.42, y=57.00, z=19.10], pm['Enderman'/112199, l='VILLAGE WORLD', x=101.96, y=57.00, z=17.12], qi['arrow'/112200, l='VILLAGE WORLD', x=160.91, y=45.54, z=-32.32], pm['Enderman'/112201, l='VILLAGE WORLD', x=53.50, y=58.00, z=-50.50], pm['Enderman'/112202, l='VILLAGE WORLD', x=51.50, y=58.00, z=-52.50], pm['Enderman'/112203, l='VILLAGE WORLD', x=50.50, y=58.00, z=-52.50], pm['Enderman'/112204, l='VILLAGE WORLD', x=47.50, y=58.00, z=-52.50], lj['Experience Orb'/112148, l='VILLAGE WORLD', x=100.00, y=50.13, z=0.00]]
- World VILLAGE WORLD Players: 1 total; [ih['colinmon22'/524, l='VILLAGE WORLD', x=100.00, y=49.00, z=0.00]]
- World VILLAGE WORLD Chunk Stats: ServerChunkCache: 767 Drop: 326
- Type: Integrated Server

java.lang.IllegalStateException: Entity is already tracked!
	at hz.a(SourceFile:67)
	at hz.a(SourceFile:56)
	at ia.a(SourceFile:24)
	at xe.a(SourceFile:786)
	at ie.a(SourceFile:553)
	at xe.d(SourceFile:778)
	at ge.a(SourceFile:355)
	at lb.b(SourceFile:1442)
	at alc.a(SourceFile:62)
	at lb.D(SourceFile:659)
	at lb.d(SourceFile:622)
	at lj.j_(SourceFile:111)
	at xe.a(SourceFile:1218)
	at ie.a(SourceFile:424)
	at xe.g(SourceFile:1197)
	at xe.h(SourceFile:1122)
	at ie.h(SourceFile:352)
	at net.minecraft.server.MinecraftServer.r(SourceFile:718)
	at net.minecraft.server.MinecraftServer.q(SourceFile:661)
	at bcb.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:595)
	at fp.run(SourceFile:818)
--- END ERROR REPORT c476f581 ----------

I'm also having this crash on my Linux Mint 13.

---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 11/7/12 7:51 PM
Description: Exception in server tick loop

java.lang.IllegalStateException: Entity is already tracked!
	at hz.a(SourceFile:67)
	at hz.a(SourceFile:56)
	at ia.a(SourceFile:24)
	at xe.a(SourceFile:786)
	at ie.a(SourceFile:553)
	at xe.d(SourceFile:778)
	at ge.a(SourceFile:355)
	at lb.b(SourceFile:1442)
	at alc.a(SourceFile:62)
	at lb.D(SourceFile:659)
	at lb.d(SourceFile:622)
	at lj.j_(SourceFile:111)
	at xe.a(SourceFile:1218)
	at ie.a(SourceFile:424)
	at xe.g(SourceFile:1197)
	at xe.h(SourceFile:1122)
	at ie.h(SourceFile:352)
	at net.minecraft.server.MinecraftServer.r(SourceFile:718)
	at net.minecraft.server.MinecraftServer.q(SourceFile:661)
	at bcb.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:595)
	at fp.run(SourceFile:818)

Relevant Details:
- Minecraft Version: 1.4.2
- Operating System: Linux (amd64) version 3.2.0-29-generic
- Java Version: 1.6.0_24, Sun Microsystems Inc.
- Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
- Memory: 65044656 bytes (62 MB) / 192413696 bytes (183 MB) up to 1392508928 bytes (1328 MB)
- JVM Flags: 0 total; 
- AABB Pool Size: 3621 (202776 bytes; 0 MB) allocated, 3621 (202776 bytes; 0 MB) used
- Is Modded: Probably not
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: 620 (34720 bytes; 0 MB) allocated, 620 (34720 bytes; 0 MB) used
- Player Count: 1 / 8; [ih['Supahminecrafter'/495, l='Andrew's World', x=100.00, y=49.00, z=0.00]]
- World Andrew's World Entities: 109 total; [ih['Supahminecrafter'/495, l='Andrew's World', x=100.00, y=49.00, z=0.00], pm['Enderman'/497, l='Andrew's World', x=-61.49, y=59.00, z=-62.50], qd['Villager'/498, l='Andrew's World', x=-50.05, y=61.00, z=-43.52], pm['Enderman'/499, l='Andrew's World', x=-62.06, y=59.00, z=-3.55], pm['Enderman'/500, l='Andrew's World', x=-53.87, y=60.00, z=-1.53], pm['Enderman'/501, l='Andrew's World', x=-58.90, y=60.00, z=-11.74], pm['Enderman'/502, l='Andrew's World', x=-51.89, y=61.00, z=-4.34], pm['Enderman'/503, l='Andrew's World', x=-32.93, y=59.00, z=-70.50], pm['Enderman'/504, l='Andrew's World', x=-35.50, y=59.00, z=-76.50], pm['Enderman'/505, l='Andrew's World', x=-17.72, y=66.00, z=-16.05], pm['Enderman'/506, l='Andrew's World', x=-21.01, y=64.00, z=-27.62], lj['Experience Orb'/508, l='Andrew's World', x=100.00, y=50.07, z=0.03], pm['Enderman'/507, l='Andrew's World', x=-23.06, y=67.00, z=2.44], pm['Enderman'/509, l='Andrew's World', x=-18.03, y=67.00, z=9.13], lj['Experience Orb'/510, l='Andrew's World', x=100.00, y=50.13, z=0.00], lj['Experience Orb'/511, l='Andrew's World', x=-27.37, y=64.25, z=13.70], lj['Experience Orb'/512, l='Andrew's World', x=-27.37, y=64.25, z=13.70], pm['Enderman'/513, l='Andrew's World', x=-26.40, y=66.00, z=28.52], lj['Experience Orb'/514, l='Andrew's World', x=-27.71, y=64.77, z=16.72], lj['Experience Orb'/515, l='Andrew's World', x=-27.71, y=64.77, z=16.72], lj['Experience Orb'/516, l='Andrew's World', x=-27.71, y=64.77, z=16.72], lj['Experience Orb'/517, l='Andrew's World', x=-27.71, y=64.77, z=16.72], lj['Experience Orb'/518, l='Andrew's World', x=-27.71, y=64.77, z=16.72], lj['Experience Orb'/519, l='Andrew's World', x=-27.71, y=64.77, z=16.72], lj['Experience Orb'/520, l='Andrew's World', x=-27.68, y=64.79, z=16.72], lj['Experience Orb'/521, l='Andrew's World', x=-27.67, y=64.79, z=16.72], lj['Experience Orb'/522, l='Andrew's World', x=-27.67, y=64.80, z=16.72], lj['Experience Orb'/523, l='Andrew's World', x=-27.69, y=64.79, z=16.72], lj['Experience Orb'/524, l='Andrew's World', x=-27.70, y=64.78, z=16.72], lj['Experience Orb'/525, l='Andrew's World', x=-28.08, y=64.54, z=16.75], lj['Experience Orb'/526, l='Andrew's World', x=-28.08, y=64.54, z=16.74], pm['Enderman'/527, l='Andrew's World', x=-29.27, y=66.00, z=36.53], pm['Enderman'/528, l='Andrew's World', x=-27.46, y=66.00, z=35.61], pm['Enderman'/529, l='Andrew's World', x=-20.04, y=66.00, z=34.35], pm['Enderman'/530, l='Andrew's World', x=-27.54, y=63.00, z=58.55], pm['Enderman'/531, l='Andrew's World', x=-17.50, y=62.00, z=72.50], pm['Enderman'/532, l='Andrew's World', x=-11.75, y=61.00, z=-43.92], pm['Enderman'/533, l='Andrew's World', x=-2.62, y=66.00, z=-21.15], pm['Enderman'/534, l='Andrew's World', x=-3.48, y=66.00, z=-18.95], pm['Enderman'/535, l='Andrew's World', x=-5.26, y=66.00, z=-18.95], pm['Enderman'/536, l='Andrew's World', x=-1.90, y=66.00, z=-20.26], pm['Enderman'/537, l='Andrew's World', x=-3.49, y=66.00, z=-18.14], pm['Enderman'/538, l='Andrew's World', x=-0.50, y=66.00, z=-16.50], pm['Enderman'/539, l='Andrew's World', x=-11.50, y=66.00, z=-16.50], pm['Enderman'/540, l='Andrew's World', x=-4.54, y=67.00, z=-12.61], pm['Enderman'/541, l='Andrew's World', x=-5.50, y=66.00, z=-15.50], pm['Enderman'/542, l='Andrew's World', x=-14.10, y=68.00, z=15.17], pm['Enderman'/543, l='Andrew's World', x=-3.83, y=68.00, z=21.30], qd['Villager'/544, l='Andrew's World', x=-4.99, y=66.00, z=44.91], pm['Enderman'/545, l='Andrew's World', x=-4.37, y=63.00, z=67.97], pm['Enderman'/546, l='Andrew's World', x=-9.35, y=62.00, z=72.07], pm['Enderman'/547, l='Andrew's World', x=-12.49, y=62.00, z=70.01], pm['Enderman'/548, l='Andrew's World', x=-11.17, y=62.00, z=75.40], pm['Enderman'/549, l='Andrew's World', x=-6.39, y=62.00, z=75.32], pm['Enderman'/550, l='Andrew's World', x=11.50, y=61.00, z=-60.50], pm['Enderman'/551, l='Andrew's World', x=12.67, y=61.00, z=-61.56], pm['Enderman'/552, l='Andrew's World', x=15.50, y=61.00, z=-57.50], pm['Enderman'/553, l='Andrew's World', x=9.56, y=67.00, z=-8.24], pm['Enderman'/554, l='Andrew's World', x=6.69, y=65.00, z=-14.88], pm['Enderman'/555, l='Andrew's World', x=4.36, y=67.00, z=-0.22], pm['Enderman'/556, l='Andrew's World', x=3.50, y=66.00, z=-11.50], pm['Enderman'/557, l='Andrew's World', x=10.68, y=68.00, z=23.87], pm['Enderman'/558, l='Andrew's World', x=9.50, y=68.00, z=26.50], pm['Enderman'/559, l='Andrew's World', x=1.50, y=68.00, z=22.50], pm['Enderman'/560, l='Andrew's World', x=2.50, y=68.00, z=22.50], pm['Enderman'/561, l='Andrew's World', x=2.50, y=68.00, z=23.50], qd['Villager'/562, l='Andrew's World', x=15.77, y=63.00, z=37.47], pm['Enderman'/563, l='Andrew's World', x=15.50, y=63.00, z=41.50], pm['Enderman'/564, l='Andrew's World', x=7.70, y=65.00, z=60.24], pm['Enderman'/565, l='Andrew's World', x=0.11, y=47.00, z=88.80], pm['Enderman'/566, l='Andrew's World', x=0.50, y=61.00, z=83.50], pm['Enderman'/567, l='Andrew's World', x=1.82, y=61.00, z=82.16], pm['Enderman'/568, l='Andrew's World', x=0.80, y=62.00, z=80.47], pm['Enderman'/569, l='Andrew's World', x=16.50, y=61.00, z=-59.50], pm['Enderman'/570, l='Andrew's World', x=19.93, y=65.00, z=-13.38], pm['Enderman'/571, l='Andrew's World', x=25.27, y=66.00, z=-0.31], pm['Enderman'/572, l='Andrew's World', x=18.46, y=67.00, z=18.06], pm['Enderman'/573, l='Andrew's World', x=25.50, y=61.00, z=66.50], pm['Enderman'/574, l='Andrew's World', x=41.76, y=62.00, z=-24.16], pm['Enderman'/575, l='Andrew's World', x=36.25, y=65.00, z=-9.02], pm['Enderman'/576, l='Andrew's World', x=41.63, y=64.00, z=-6.05], pm['Enderman'/577, l='Andrew's World', x=42.50, y=64.00, z=2.50], pm['Enderman'/578, l='Andrew's World', x=47.62, y=65.00, z=19.13], qd['Villager'/579, l='Andrew's World', x=39.74, y=57.00, z=70.10], pm['Enderman'/580, l='Andrew's World', x=60.50, y=60.00, z=-21.50], pm['Enderman'/581, l='Andrew's World', x=59.50, y=60.00, z=-21.50], qd['Villager'/582, l='Andrew's World', x=52.26, y=64.00, z=10.70], pm['Enderman'/583, l='Andrew's World', x=49.50, y=51.00, z=69.50], pm['Enderman'/584, l='Andrew's World', x=67.50, y=58.00, z=-53.50], pm['Enderman'/585, l='Andrew's World', x=77.50, y=39.00, z=-41.50], pm['Enderman'/586, l='Andrew's World', x=75.50, y=59.00, z=-18.50], qd['Villager'/587, l='Andrew's World', x=64.43, y=61.00, z=39.67], qd['Villager'/588, l='Andrew's World', x=86.93, y=57.00, z=-31.05], qd['Villager'/589, l='Andrew's World', x=83.75, y=57.00, z=41.40], qd['Villager'/590, l='Andrew's World', x=90.54, y=41.00, z=67.92], pm['Enderman'/591, l='Andrew's World', x=32.50, y=66.00, z=41.50], pm['Enderman'/592, l='Andrew's World', x=30.50, y=66.00, z=42.50], pm['Enderman'/593, l='Andrew's World', x=31.50, y=66.00, z=42.50], pm['Enderman'/594, l='Andrew's World', x=32.50, y=66.00, z=39.50], pm['Enderman'/595, l='Andrew's World', x=43.50, y=52.00, z=70.50], pm['Enderman'/597, l='Andrew's World', x=78.50, y=59.00, z=-27.50], pm['Enderman'/598, l='Andrew's World', x=77.50, y=59.00, z=-24.50], pm['Enderman'/599, l='Andrew's World', x=76.50, y=59.00, z=-24.50], pm['Enderman'/600, l='Andrew's World', x=76.50, y=59.00, z=-23.50], pm['Enderman'/601, l='Andrew's World', x=19.50, y=58.00, z=-90.50], pm['Enderman'/602, l='Andrew's World', x=21.50, y=58.00, z=-93.50], pm['Enderman'/603, l='Andrew's World', x=21.50, y=58.00, z=-90.50], pm['Enderman'/604, l='Andrew's World', x=20.50, y=58.00, z=-91.50], lj['Experience Orb'/510, l='Andrew's World', x=100.00, y=50.13, z=0.00]]
- World Andrew's World Players: 1 total; [ih['Supahminecrafter'/495, l='Andrew's World', x=100.00, y=49.00, z=0.00]]
- World Andrew's World Chunk Stats: ServerChunkCache: 441 Drop: 0
- Type: Integrated Server

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.

Updated affected version on info of MC-817

Added crash report of MC-817:

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 12/1/12 9:16 PM
Description: Ticking entity

java.lang.IllegalStateException: Entity is already tracked!
	at ii.a(SourceFile:72)
	at ii.a(SourceFile:50)
	at ij.a(SourceFile:24)
	at xv.a(SourceFile:842)
	at in.a(SourceFile:581)
	at xv.d(SourceFile:834)
	at gm.a(SourceFile:369)
	at lq.b(SourceFile:1492)
	at px.b(SourceFile:201)
	at amg.a(SourceFile:62)
	at lq.D(SourceFile:652)
	at lq.d(SourceFile:615)
	at px.j_(SourceFile:67)
	at xv.a(SourceFile:1317)
	at in.a(SourceFile:451)
	at xv.g(SourceFile:1296)
	at xv.h(SourceFile:1195)
	at in.h(SourceFile:363)
	at net.minecraft.server.MinecraftServer.r(SourceFile:751)
	at net.minecraft.server.MinecraftServer.q(SourceFile:686)
	at bdo.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:620)
	at fy.run(SourceFile:856)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at ii.a(SourceFile:72)
	at ii.a(SourceFile:50)
	at ij.a(SourceFile:24)
	at xv.a(SourceFile:842)
	at in.a(SourceFile:581)
	at xv.d(SourceFile:834)
	at gm.a(SourceFile:369)
	at lq.b(SourceFile:1492)
	at px.b(SourceFile:201)
	at amg.a(SourceFile:62)
	at lq.D(SourceFile:652)
	at lq.d(SourceFile:615)
	at px.j_(SourceFile:67)
	at xv.a(SourceFile:1317)
	at in.a(SourceFile:451)
	at xv.g(SourceFile:1296)

-- Entity being ticked --
Details:
	Entity Type: Item (px)
	Entity ID: 114
	Name: item.tile.dirt
	Exact location: 100.00, 50.13, 0.00
	Block location: World: (100,50,0), Chunk: (at 4,3,0 in 6,0; contains blocks 96,0,0 to 111,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Momentum: -0.00, -0.17, -0.00
Stacktrace:
	at xv.h(SourceFile:1195)
	at in.h(SourceFile:363)

-- Affected level --
Details:
	Level name: Isle Creepis
	All players: 1 total; [iq['Knightstephen141'/77, l='Isle Creepis', x=100.00, y=49.00, z=0.00]]
	Chunk stats: ServerChunkCache: 441 Drop: 0
	Level seed: 7539544101188858510
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 0 game time, 0 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.server.MinecraftServer.r(SourceFile:751)
	at net.minecraft.server.MinecraftServer.q(SourceFile:686)
	at bdo.q(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:620)
	at fy.run(SourceFile:856)

-- System Details --
Details:
	Minecraft Version: 1.4.5
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_09, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 414369304 bytes (395 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 1301 (72856 bytes; 0 MB) allocated, 1301 (72856 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 107 (5992 bytes; 0 MB) allocated, 107 (5992 bytes; 0 MB) used
	Player Count: 1 / 8; [iq['Knightstephen141'/77, l='Isle Creepis', x=100.00, y=49.00, z=0.00]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

The obfuscated symbols in the crash reports differ a bit, but looking quite similar:

This:

java.lang.IllegalStateException: Entity is already tracked!
	at hz.a(SourceFile:67)
	at hz.a(SourceFile:56)
	at ia.a(SourceFile:24)
	at xe.a(SourceFile:786)

MC-2058

java.lang.IllegalStateException: Entity is already tracked!
	at ih.a(SourceFile:72)
	at ih.a(SourceFile:56)
	at ii.a(SourceFile:24)
	at xv.a(SourceFile:842)

MC-817

Description: Ticking entity
java.lang.IllegalStateException: Entity is already tracked!
	at ii.a(SourceFile:72)
	at ii.a(SourceFile:61)
	at ij.a(SourceFile:24)
	at xv.a(SourceFile:842)

More debugging has been added to help find this issue for the next snapshot.

Attached crash from MC-7790 in 13w03a with more debug info.

@all: Can you try to reproduce this crash with the newest snapshot 13w03a and attach the crash reports here - as Dinnerbone said, there is more debug info for finding this issue.

Added more crashes for recent snapshots.

My report (MC-8849) is said to be a duplicate of this one but in includes crash reports from 13w04a, FYI.

Having the same issue but not only upon entering the End but just randomly in the normal world in 13w06a!

I got exaclty the same issue. I started playing my world in 1.2.5. I went to the end killed the dragon and never went back again. Now at 1.4.7 i wanted to go back again but it crashes. i can see some end blocks but the game crashes 😞

I could not find any existing issue that contains any of the crashes mentioned here. However, all of the crash reports that you have provided are from a modded version of Minecraft. Please try to reproduce the crash in a vanilla (non-modded) version of Minecraft and attach that report or this may be dismissed as being caused by a mod.

{Mod correction: This points at crash-2013-02-26_22.18.17-server.txt uploaded not by the creator of this ticket}

Same with non-modded jar 😞 hope u are able to find the problem. thank you anyway for noticing

Deleting DIM1 Folder solves the Problem. You have to Fight the Enderdragon again but anyway i am able to get to the end and get some endstone.

This just happened to me in 13w10a, the latest snapshot, on march 4th 2013. Crash log below:

Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem; Adding entity to track

A full error report has been saved to C:\Users\Samson\Desktop\Minecraft\MultiMC 4.1\instances\SSP 1.4.5\minecraft\crash-reports\crash-2013-03-04_21.49.08-server.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash :(



--- BEGIN ERROR REPORT b932c3bd --------
Full report at:
C:\Users\Samson\Desktop\Minecraft\MultiMC 4.1\instances\SSP 1.4.5\minecraft\crash-reports\crash-2013-03-04_21.49.08-server.txt
Please show that file to Mojang, NOT just this screen!

Generated 3/4/13 9:49 PM

-- Entity To Track --
Details:
	Tracking range: 144 blocks
	Update interval: Once per 20 ticks
	Entity Type: FallingSand (ra)
	Entity ID: 17202
	Entity Name: Falling Block
	Entity's Exact location: -192.50, 27.50, 676.50
	Entity's Block location: World: (-193,27,676), Chunk: (at 15,1,4 in -13,42; contains blocks -208,0,672 to -193,255,687), Region: (-1,1; contains chunks -32,32 to -1,63, blocks -512,0,512 to -1,255,1023)
	Entity's Momentum: 0.00, 0.00, 0.00
	Immitating block ID: 13
	Immitating block data: 0
Stacktrace:
	at it.a(SourceFile:76)
	at it.a(SourceFile:61)
	at iv.a(SourceFile:24)
	at zv.a(SourceFile:867)
	at iz.a(SourceFile:632)
	at zv.d(SourceFile:859)
	at amn.k(SourceFile:55)
	at amn.a(SourceFile:35)

-- Block being ticked --
Details:
	Block type: ID #13 (tile.gravel // amk)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-193,27,676), Chunk: (at 15,1,4 in -13,42; contains blocks -208,0,672 to -193,255,687), Region: (-1,1; contains chunks -32,32 to -1,63, blocks -512,0,512 to -1,255,1023)
Stacktrace:
	at iz.a(SourceFile:430)
	at iz.b(SourceFile:142)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [jc['Lothrazar'/7726, l='New World', x=-227.50, y=65.00, z=674.50]]
	Chunk stats: ServerChunkCache: 733 Drop: 0
	Level seed: -6632628904737236560
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-221,64,682), Chunk: (at 3,4,10 in -14,42; contains blocks -224,0,672 to -209,255,687), Region: (-1,1; contains chunks -32,32 to -1,63, blocks -512,0,512 to -1,255,1023)
	Level time: 329 game time, 329 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 43642 (now: false), thunder time: 176002 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bja.q(SourceFile:122)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)

-- System Details --
Details:
	Minecraft Version: 13w10a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_13, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 290034168 bytes (276 MB) / 514523136 bytes (490 MB) up to 1140850688 bytes (1088 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1224m
	AABB Pool Size: 7769 (435064 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 5963 (333928 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [jc['Lothrazar'/7726, l='New World', x=-227.50, y=65.00, z=674.50]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

java.lang.IllegalStateException: Entity is already tracked!
	at it.a(SourceFile:76)
	at it.a(SourceFile:61)
	at iv.a(SourceFile:24)
	at zv.a(SourceFile:867)
	at iz.a(SourceFile:632)
	at zv.d(SourceFile:859)
	at amn.k(SourceFile:55)
	at amn.a(SourceFile:35)
	at iz.a(SourceFile:430)
	at iz.b(SourceFile:142)
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bja.q(SourceFile:122)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)
--- END ERROR REPORT 7e052989 ----------

Just to add more information to the comment above, this didnt just happen in the snapshot, but it was a new world created in the 13w10a snapshot. (however, snapshot may not matter as this report looks to be originally from 1.4.2).

I created a new creative world to test some things, right away I opened my inventory and added some items to my hotbar (minecart and something else), then this happened.

After the crash, i can reload the game, load the same world, and the crash does not happen again. I have to assume this only happens when generating new chunks, and then a falling block (in my case gravel) gets tracked twice.

I'm getting almost exactly what is described in MC-8849, which is marked as a duplicate of this bug.

I built a sky trap just below the build limit (roof is at y=255), and the game crashes occasionally with the "Adding entity to track" message. This has happened twice so far. Both times, the entity added was Squid. I'm using the current snapshot (13w10b).

Also, the entity count goes nuts at high altitude. Might be related...

Here's the error report. Email me if you need a copy of the world.

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 06/03/13 5:32 PM
Description: Adding entity to track

java.lang.IllegalStateException: Entity is already tracked!
	at it.a(SourceFile:76)
	at it.a(SourceFile:55)
	at iv.a(SourceFile:24)
	at zv.a(SourceFile:867)
	at iz.a(SourceFile:635)
	at zv.d(SourceFile:859)
	at aah.a(SourceFile:138)
	at iz.b(SourceFile:119)
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bja.q(SourceFile:122)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Entity To Track --
Details:
	Tracking range: 64 blocks
	Update interval: Once per 3 ticks
	Entity Type: Squid (ql)
	Entity ID: 8560585
	Entity Name: Squid
	Entity's Exact location: 313.50, 55.00, 121.50
	Entity's Block location: World: (313,55,121), Chunk: (at 9,3,9 in 19,7; contains blocks 304,0,112 to 319,255,127), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
	at it.a(SourceFile:76)
	at it.a(SourceFile:55)
	at iv.a(SourceFile:24)
	at zv.a(SourceFile:867)
	at iz.a(SourceFile:635)
	at zv.d(SourceFile:859)
	at aah.a(SourceFile:138)
	at iz.b(SourceFile:119)

-- Affected level --
Details:
	Level name: Snapshot
	All players: 1 total; [jc['Yorple'/183, l='Snapshot', x=214.70, y=249.36, z=171.43]]
	Chunk stats: ServerChunkCache: 937 Drop: 0
	Level seed: -5973087429268262022
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-64,64,236), Chunk: (at 0,4,12 in -4,14; contains blocks -64,0,224 to -49,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 2665748 game time, 3138989 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 24724 (now: false), thunder time: 156944 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bja.q(SourceFile:122)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)

-- System Details --
Details:
	Minecraft Version: 13w10b
	Operating System: Linux (amd64) version 3.2.0-4-amd64
	Java Version: 1.6.0_24, Sun Microsystems Inc.
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 80269624 bytes (76 MB) / 359534592 bytes (342 MB) up to 675086336 bytes (643 MB)
	JVM Flags: 1 total; -Xms350M
	AABB Pool Size: 4377 (245112 bytes; 0 MB) allocated, 4 (224 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 3698 (207088 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [jc['Yorple'/183, l='Snapshot', x=214.70, y=249.36, z=171.43]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

Minecraft 1.5 pre-release
Creating new world
Entity Type: FallingSand (ra)
32-bit JRE - Server VM

We can't really find why this is happening, so please continue adding reports and information for this bug. However, in 1.5.1 this error will be ignored by the game so at least the game doesn't crash when it happens.

In the crash report I found it was tracking a item.tile.stonebrick. Explanation?

A dropped stone brick is an entity.

Found what a IllegalStateExeption is, it signals that a method has been invoked at an illegal or inappropriate time. In other words, the Java environment or Java application is not in an appropriate state for the requested operation.

More at http://docs.oracle.com/javase/6/docs/api/java/lang/IllegalStateException.html

Called here:

EntityTracker.java

public void trackEntity(Entity par1Entity, int par2, int par3, boolean par4)
...
if (this.trackedEntityHashTable.containsItem(par1Entity.entityId))
{
   throw new IllegalStateException("Entity is already tracked!");
}
...

Looked at 5 of these duplications. It seems that in the crash reports it's a exeption with "Ticking entities, blocks, world, ext."

Almost every crash report states "Adding entity to track." Two state "Ticking entity"

Invariably I also see the 'ticking entity' bit when MC crashes. Now, in my case, I'm not the least bit surprised that javaw is crashing (it's not MC that is giving me fits, but Java itself, on top of which MC runs) because I'm trying to detonate an obscene amount of TNT. First time I got this 'ticking entity' bit I was in the middle of detonating a small thermonuclear bomb's worth: about 30 kilotons of TNT, that is, a little over 18,000 TNT blocks and twice the yield of the first atomic bomb. Moments before everything died the Java VM exclaimed in no uncertain terms, "What do you think I am, a bluddy Cray Jaguar? You deserve this." and then promptly went apeshit. But, in almost every case, the VM went apeshit because it ran out of heap space. That is the real problem here: no memory left on which to blow things up.

Mojang, bless their hearts, recommended the following magical incantation when invoking Minecraft:

javaw -Xms512m -Xmx512m -jar minecraft.exe

On Windows platforms, open Notepad, copy the above line into it, change the file type to 'All Files' (it wants to be a .txt file), save the file as <some name>.bat in the same folder in which minecraft.exe lives and then click on this batch file instead of minecraft.exe directly.

What this does is set the heap's (the chunk of memory in which minecraft remembers things like how much progress a piece of TNT has made in exploding, where it is as it's flying about as the result of other blocks blowing up and really cool, arcane things like that) initial and maximum size to some larger value (512 megabytes), assumed to be larger than what it's set to now, except that 512m is about 512m smaller than the default size I'm currently using (910m is what's shown when MC is running and I press F3), suggesting that this bit of sage advice from Mojang's demigods is now a bit dated.

Problem is, when I do this for the latest MC release, that is, v1.6.1, minecraft.exe shits the bed completely without even so much as a swan song. Setting -Xmx option to some higher value and minecraft.exe never even gets a chance to crash at all - javaw doesn't get past the 'invoke javaw without an error' stage. Thing is, javaw is pretty mum about such things as why it died, given its reluctance to talk to console windows.

I'm no java expert, but if some of you are, please, somebody please give this problem some attention? I've a megaton of TNT (a sphere with a diameter of 159 TNT blocks) just sitting around waiting for somebody to set it alight. It is after all, about to be July 4 in the U.S. and merely the day before July 5 in the U.K. 🙂

Something for Mojang's bit jockeys to consider in preventing (or, at least, forestalling) this out-of-heap-space problem: rather than blindling allocating chunks of memory until you fall off a cliff, programmatically monitor how much heap space is left and increase the heap size as-you-need-more from within the program itself -- and do so in some reasonable, intelligent fashion that doesn't starve other applications of memory, possibly by setting the max heap size to some percentage of available memory (this value having been programmatically gotten from the operating system). The program could further 'tune' this threshold by observing how badly other apps are thrashing (by monitoring overall VMM page-fault rates, possibly. This implies kernel-level operating system support btw, possibly by means of a device driver). This, in combination with some sort of intelligent algorithm which processes to completion as many already-allocated-stuffed-and-ticking blocks as possible and then retiring that processing before grabbing more memory.

Alternatively, a better, more robust approach (requiring a lot more work. There truly is no such thing as a 'free lunch') Mojang could write their own memory manager which shuffles blocks-in-process off to the hard drive, grabbing others off the drive for their turn in the barrel; basically paging chunks of blocks into and out of RAM until everything is finished. You know, the way VMMs work way deep down in the operating system? Yes, things won't complete in real time, but it's certainly better than the curtain coming down totally – and Mojang getting even more bug reports therefrom. Your typical More Work Up Front in Exchange for Much Less Work Later tradeoff.

None of this is trivial, btw. Not even. It's a shitload of work; something I learned the Hard Way from writing custom, embedded, preemptive, 'hard' real-time operating systems from scratch. (Not recommended for the faint-of-heart unless you're a certified, card-carrying masochist with an adrenaline-rush addiction. I am.)

Tex Pepper: The maximum amount of memory (-Xmx) cannot be changed at runtime. It also does not actually use that amount of memory unless you specify -Xms for "minimum amount of memory to use". Don't use -Xms, that's silly.

The amount of memory that is actually used by the application is of course dynamically changed based on, uh, how much it needs. But it won't go above the specified limit and cannot change that limit. It's outside of our control.

For the new launcher, specify the maximum memory amount in "Edit profile". If you're on 32bit java it'll be limited to about 1GB, if you're on 64bit java it could be more than your machine actually has. Don't be shy about using a big number if you think you'll ever run into it: it doesn't use this memory if it doesn't need this memory, this is just the upper limit.

"Bit jockey" out 🙂

Good morning, BJ Dinnerbone 🙂

You wrote: " It also does not actually use that amount of memory unless you specify -Xms for "minimum amount of memory to use". Don't use -Xms, that's silly."

Well, yes. But it was Mojang who suggested this as a fix in the first place, else I wouldn't have known about it at all (I'm not a Java person): http://help.mojang.com/customer/portal/articles/928783-minecraft-has-run-out-of-memory

" If you're on 32bit java it'll be limited to about 1GB, if you're on 64bit java it could be more than your machine actually has."

This is very good to know, especially the 64-bit part. I've looked on Bog knows how many sites and they've all seemed more eager to tell me "the -X options are nonstandard and could go away at any time" than telling me what the actual limits are. What you wrote is therefore greatly appreciated.

'Bit Jockey' is a complement, btw. At least in my neck of the woods.

Take care and thanks for your prompt reply!

Tex

Dinnerbone,

I invoked MC 1.6.1 from the command line (from a batch file, actually) via:

javaw -Xmx2048m -jar Minecraft(v1.6).exe

but it had no effect whatsoever in terms of MC's knowledge of the heap size. Nothing changed. MC still bailed when its usage hit 910 MiB, as before. I've 4 GiB of RAM installed in this (64-bit, four-core) machine. The Task Manager indicated that nearly 3 GiB were available when I launched MC in this way.

Please note, btw, that I've renamed the latest version of Minecraft to Minecraft(v1.6) to distinguish it from v1.5.2.

https://twitter.com/Dinnerbone/status/353226575157805056

Please read Nathan's earlier replies to me and please refer to the link I provided to Mojang's support pages in which Mojang themselves suggest this very approach. Now, why would Nathan tell this bloke "No, sorry," to his query about whether you can invoke Minecraft from the command line and yet, here, tell me the complete opposite!? I don't get it, especially in light of the fact that

javaw -Xmx2048m -jar Minecraft.exe

actually does invoke Minecraft AND from the command line, and why shouldn't it? Minecraft is a Java application and this is one way of launching a Java application – any Java application, and so, I'm wondering if Nathan is just jacking with this bloke?

"For the new launcher, specify the maximum memory amount in "Edit profile". If you're on 32bit java it'll be limited to about 1GB, if you're on 64bit java it could be more than your machine actually has. Don't be shy about using a big number if you think you'll ever run into it: it doesn't use this memory if it doesn't need this memory, this is just the upper limit."

Ah. Blame English, my native tongue. 😉

I could not find any existing issue that contains any of the crashes mentioned here. However, all of the crash reports that you have provided are from a modded version of Minecraft. Please try to reproduce the crash in a vanilla (non-modded) version of Minecraft and attach that report or this may be dismissed as being caused by a mod. You can view all information known about this specific crash at MCX-365.

The bot needs an oil change...

Is this still a concern in the current Minecraft version 1.6.2 / Launcher version 1.1.2 ? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

"... However, all of the crash reports that you have provided are from a modded version of Minecraft."

Are you serious? Modded?? Given that I downloaded the thing directly from Mojang's website not a few days earlier and given that I am still a relatively new user, I must've modded it in my sleep (in spite of the fact that wouldn't know where to begin, let alone pulling it off convincingly)

Explanation #2: Mojang is now offering pre-modded copies to save Modders the effort and at no extra charge?

Explanation #3: It is not actually modded, but your crash-report generator thingie only thinks it is, which raises the question: how do you know your crash-report generator thingie is itself working properly if perchance it isn't? (possibly analogous to the Dunning-Kruger Effect but applied to software instead of Humans)

Explanation #4: The website from which I downloaded Minecraft 1.6.1 is not really Mojang's website, but someone else's; possibly the NSA's Mojang clone (to keep a sharp eye out for, you know, Bad Guys, folks who'd violate our U.S. Constitution given half a chance, all in the name of Truth, Justice and the American Way?) or, maybe a Zombie-in-the-Middle Mojang clone and my copy of Minecraft is really a Trojan Horse? In which case, how do I know you're really Mojang's folks and not Bad Guys? How would I know? How would anyone?

The Plot thickens.... 😉

No one ever said it was modded.

Please stop commenting, Tex Pepper. The bot is Dinnerbone's, not ours and looks at crashes uploaded with the initial creation of the ticket. We are sorry you misinterpreted what he said and found it upsetting. The bot is actually very helpful for finding duplicates from the crashes provided. More comments will just be deleted.

Since there is no indication that this bug is ever occured on a 1.6.2 version, this ticket is resolved as fixed.