[MC-74762] Chunks Swapping

The bug

Under certain circumstances chunks can swap or reset.

As suggested by @unknown Minecraft should handle IOExceptions in a saner way and not just log them and carry on.

Known reasons

Full disk

It is confirmed that this bug happens when no free memory on the disk is left.

1.12.2

[16:40:12] [File IO Thread/ERROR]: Failed to save chunk
java.lang.NullPointerException: null
[16:40:12] [File IO Thread/INFO]: [STDERR]: java.io.IOException: Es steht nicht genug Speicherplatz auf dem Datenträger zur Verfügung
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at java.io.RandomAccessFile.writeBytes(Native Method)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at java.io.RandomAccessFile.write(Unknown Source)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at ayj.a(SourceFile:306)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at ayj$a.close(SourceFile:244)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at java.util.zip.DeflaterOutputStream.close(Unknown Source)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at java.io.FilterOutputStream.close(Unknown Source)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at java.io.FilterOutputStream.close(Unknown Source)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at aye.b(SourceFile:160)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at aye.a(SourceFile:145)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at bgx.c(SourceFile:37)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at bgx.run(SourceFile:30)
[16:40:12] [File IO Thread/INFO]: [STDERR]: 	at java.lang.Thread.run(Unknown Source)

"Es steht nicht genug Speicherplatz auf dem Datenträger zur Verfügung" (German) should be equivalent to the American English "There is not enough space on the disk".
This shows that the exception message is an OS error message and therefore OS dependent and translated. See also this stackoverflow question and this (currently unresolved) JDK bug report from 2001 requesting a separate exception for a full disk.

This stackoverflow question suggests that you might not even be able to directly detect a full disk, and calling getFD().sync() could decrease performance. However, it appears currently the call to FilterOutputStream#close causes the exception.

The question is if at that point the save files could have already been corrupted. Additionally a full disk can cause all kind of other problems, like for example the logger being unable to create log files.

How to reproduce

Windows

Use for example this guide to create a VHD and create a volume with a size of 10MB
Add a new profile using this volume as game directory
Create a new default world with gamemode Creative and fly around

Linux

See this comment (not checked)

Malfunctioning disk (?)

Hard to reproduce and likely difficult to detect.

In case an IOException happens possibly log the error and try shutting down the server?

Linked issues

is duplicated by 59

MC-75167 Chunks are scrambled or replaced Resolved

MC-75613 Chunks switching locations Resolved

MC-81538 Chunks load in the wrong place ruining a world. Resolved

MC-90475 Minecraft chunks not generating properly in 15w41b Resolved

MC-90885 The world is moving blocks in the ground and above ground to places they were not originally. Resolved

54 more links

relates to 3

MC-87353 java.util.zip.ZipException: Not in GZIP format Resolved

MC-2548 A chunk with previously generated data was cleared, all the blocks and data within vanish Resolved

MC-91279 Placed blocks randomly generating nearby Resolved

Attachments

crash-2017-01-15_17.46.31-client.txt

Comments 50

Sonicwave 2014-11-26T22:24:07Z

Please force a crash by holding F3+C for 10 or more seconds and attach the report here.

Declan Sullivan 2014-11-27T04:50:49Z

---- Minecraft Crash Report ----
// My bad.

Time: 11/26/14 8:49 PM
Description: Manually triggered debug crash

java.lang.Throwable
	at bss.r(SourceFile:1570)
	at bss.at(SourceFile:880)
	at bss.a(SourceFile:317)
	at net.minecraft.client.main.Main.main(SourceFile:124)


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

-- Head --
Stacktrace:
	at cem.a(SourceFile:308)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [cin['declanblock'/570871, l='MpServer', x=166.28, y=134.43, z=163.67]]
	Chunk stats: MultiplayerChunkCache: 1089, 1089
	Level seed: 0
	Level generator: ID 03 - amplified, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: -136.00,64.00,256.00 - World: (-136,64,256), Chunk: (at 8,4,0 in -9,16; contains blocks -144,0,256 to -129,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 6882553 game time, 6412 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: Game mode: spectator (ID 3). Hardcore: false. Cheats: false
	Forced entities: 222 total; [adn['Painting'/570862, l='MpServer', x=192.00, y=134.50, z=175.97], adn['Painting'/570863, l='MpServer', x=192.00, y=133.00, z=175.97], agh['Zombie'/574270, l='MpServer', x=229.50, y=140.00, z=102.50], agh['Zombie'/574271, l='MpServer', x=227.97, y=140.00, z=101.97], agc['Spider'/571030, l='MpServer', x=116.50, y=43.00, z=114.50], afv['Skeleton'/571028, l='MpServer', x=112.50, y=39.00, z=125.16], afv['Skeleton'/571029, l='MpServer', x=112.50, y=39.00, z=119.50], agh['Zombie'/571027, l='MpServer', x=112.50, y=39.00, z=122.50], agh['Zombie'/571024, l='MpServer', x=121.34, y=44.00, z=121.84], abr['Bat'/571038, l='MpServer', x=115.97, y=43.43, z=113.46], abr['Bat'/571036, l='MpServer', x=125.51, y=43.23, z=124.74], abr['Bat'/571037, l='MpServer', x=114.75, y=43.10, z=116.47], agc['Spider'/571035, l='MpServer', x=123.97, y=46.09, z=120.69], abr['Bat'/571032, l='MpServer', x=118.92, y=44.44, z=114.80], abr['Bat'/571033, l='MpServer', x=112.56, y=46.10, z=112.53], adx['item.item.egg'/571045, l='MpServer', x=127.03, y=62.00, z=146.06], abu['Chicken'/571044, l='MpServer', x=126.59, y=62.53, z=146.13], adn['Painting'/571047, l='MpServer', x=124.97, y=81.00, z=238.50], aeg['container.minecart'/571046, l='MpServer', x=123.09, y=78.06, z=238.18], abr['Bat'/571041, l='MpServer', x=116.47, y=52.10, z=113.63], abr['Bat'/571040, l='MpServer', x=114.75, y=43.10, z=116.38], afv['Skeleton'/571043, l='MpServer', x=115.53, y=36.00, z=145.88], abr['Bat'/571042, l='MpServer', x=115.63, y=52.10, z=113.53], abu['Chicken'/571060, l='MpServer', x=138.84, y=62.72, z=152.00], adx['item.item.egg'/571061, l='MpServer', x=139.78, y=62.00, z=152.56], abu['Chicken'/571062, l='MpServer', x=136.84, y=62.54, z=153.97], adx['item.item.arrow'/571063, l='MpServer', x=143.16, y=67.50, z=166.94], acp['Squid'/571056, l='MpServer', x=136.78, y=60.75, z=104.75], acc['Pig'/571057, l='MpServer', x=135.81, y=62.00, z=100.06], acm['Sheep'/571068, l='MpServer', x=129.06, y=78.00, z=196.81], acm['Sheep'/571069, l='MpServer', x=132.50, y=78.00, z=196.06], acm['Sheep'/571070, l='MpServer', x=131.31, y=78.00, z=196.06], abu['Chicken'/571071, l='MpServer', x=131.09, y=82.50, z=239.31], acm['Sheep'/571064, l='MpServer', x=133.66, y=78.00, z=197.19], acm['Sheep'/571065, l='MpServer', x=130.19, y=78.00, z=196.06], acm['Sheep'/571066, l='MpServer', x=132.75, y=78.00, z=198.59], adj['Armour Stand'/571067, l='MpServer', x=129.50, y=78.00, z=200.50], abu['Chicken'/571075, l='MpServer', x=131.09, y=82.50, z=239.88], abu['Chicken'/571074, l='MpServer', x=131.48, y=82.50, z=239.88], abu['Chicken'/571073, l='MpServer', x=131.88, y=82.50, z=239.44], abu['Chicken'/571072, l='MpServer', x=131.88, y=82.50, z=239.09], aeq['Creeper'/579838, l='MpServer', x=132.50, y=65.00, z=182.50], abu['Chicken'/571079, l='MpServer', x=131.19, y=84.06, z=240.19], agh['Zombie'/577445, l='MpServer', x=221.50, y=65.00, z=138.69], abu['Chicken'/571078, l='MpServer', x=131.19, y=84.06, z=241.94], abu['Chicken'/571077, l='MpServer', x=131.78, y=84.06, z=240.19], agh['Zombie'/577447, l='MpServer', x=221.44, y=65.00, z=137.81], abu['Chicken'/571076, l='MpServer', x=131.88, y=82.50, z=239.88], abu['Chicken'/571083, l='MpServer', x=131.19, y=84.06, z=240.19], agh['Zombie'/580309, l='MpServer', x=231.50, y=140.00, z=102.50], abu['Chicken'/571082, l='MpServer', x=131.78, y=84.06, z=241.19], abu['Chicken'/571081, l='MpServer', x=131.19, y=84.06, z=242.78], abu['Chicken'/571080, l='MpServer', x=131.78, y=84.06, z=242.78], abu['Chicken'/571087, l='MpServer', x=131.19, y=84.06, z=241.28], abu['Chicken'/571086, l='MpServer', x=131.78, y=84.06, z=240.80], abu['Chicken'/571085, l='MpServer', x=131.19, y=84.06, z=242.78], abu['Chicken'/571084, l='MpServer', x=131.78, y=84.06, z=241.06], abu['Chicken'/571090, l='MpServer', x=131.19, y=84.06, z=240.19], abu['Chicken'/571091, l='MpServer', x=131.19, y=84.06, z=242.05], abu['Chicken'/571088, l='MpServer', x=131.19, y=84.06, z=242.78], agn['Villager'/578620, l='MpServer', x=92.28, y=170.00, z=205.28], abu['Chicken'/571089, l='MpServer', x=131.78, y=84.06, z=240.19], abu['Chicken'/571094, l='MpServer', x=131.19, y=84.06, z=242.78], abu['Chicken'/571095, l='MpServer', x=131.78, y=84.06, z=242.78], agc['Spider'/580769, l='MpServer', x=206.50, y=109.00, z=111.50], abu['Chicken'/571092, l='MpServer', x=131.19, y=84.06, z=241.22], abu['Chicken'/571093, l='MpServer', x=131.19, y=84.06, z=241.97], abu['Chicken'/571098, l='MpServer', x=131.78, y=84.06, z=241.31], abu['Chicken'/571099, l='MpServer', x=131.78, y=84.06, z=242.78], abu['Chicken'/571096, l='MpServer', x=131.19, y=84.06, z=240.19], abu['Chicken'/571097, l='MpServer', x=131.19, y=84.06, z=241.91], abu['Chicken'/571102, l='MpServer', x=131.78, y=84.06, z=241.95], abu['Chicken'/571103, l='MpServer', x=131.78, y=84.06, z=240.19], abu['Chicken'/571100, l='MpServer', x=131.19, y=84.06, z=240.98], abu['Chicken'/571101, l='MpServer', x=131.78, y=84.06, z=241.96], abu['Chicken'/571105, l='MpServer', x=131.19, y=84.06, z=242.78], abu['Chicken'/571104, l='MpServer', x=131.78, y=84.06, z=240.19], abu['Chicken'/571106, l='MpServer', x=131.19, y=84.06, z=240.19], acc['Pig'/571121, l='MpServer', x=146.53, y=64.00, z=93.44], abu['Chicken'/571122, l='MpServer', x=148.31, y=62.63, z=121.41], abv['Cow'/571123, l='MpServer', x=147.16, y=61.99, z=123.03], adx['item.item.egg'/571124, l='MpServer', x=148.28, y=61.00, z=122.53], abv['Cow'/571125, l='MpServer', x=149.22, y=62.35, z=125.28], abv['Cow'/571126, l='MpServer', x=157.91, y=62.40, z=136.34], abv['Cow'/571127, l='MpServer', x=145.28, y=63.00, z=153.66], abu['Chicken'/571128, l='MpServer', x=156.56, y=57.00, z=174.66], adx['item.item.arrow'/571129, l='MpServer', x=144.00, y=67.50, z=167.38], adx['item.item.arrow'/571130, l='MpServer', x=144.88, y=68.50, z=171.22], afv['Skeleton'/580158, l='MpServer', x=210.50, y=76.00, z=133.50], afv['Skeleton'/580157, l='MpServer', x=210.72, y=76.00, z=134.22], abr['Bat'/579584, l='MpServer', x=125.44, y=44.11, z=124.43], abr['Bat'/579585, l='MpServer', x=113.46, y=42.11, z=117.11], abr['Bat'/579587, l='MpServer', x=117.02, y=44.85, z=113.23], aer['Enderman'/575811, l='MpServer', x=221.50, y=102.00, z=95.50], aer['Enderman'/575810, l='MpServer', x=222.22, y=102.00, z=94.25], aer['Enderman'/575813, l='MpServer', x=244.28, y=92.00, z=123.91], aer['Enderman'/575812, l='MpServer', x=219.50, y=102.00, z=95.50], adn['Painting'/571047, l='MpServer', x=124.97, y=81.00, z=238.50], abv['Cow'/571001, l='MpServer', x=103.03, y=63.00, z=115.56], adx['item.item.egg'/571003, l='MpServer', x=107.88, y=60.00, z=156.44], afv['Skeleton'/571002, l='MpServer', x=96.50, y=44.00, z=152.50], abu['Chicken'/571004, l='MpServer', x=109.47, y=62.67, z=156.97], agh['Zombie'/571007, l='MpServer', x=101.69, y=62.63, z=177.34], abu['Chicken'/571006, l='MpServer', x=99.00, y=62.68, z=160.09], aeq['Creeper'/571284, l='MpServer', x=242.50, y=130.00, z=104.50], afv['Skeleton'/571286, l='MpServer', x=243.50, y=132.00, z=106.50], aeq['Creeper'/571287, l='MpServer', x=242.50, y=129.00, z=102.50], aeq['Creeper'/571283, l='MpServer', x=243.41, y=129.00, z=104.69], abu['Chicken'/571294, l='MpServer', x=244.59, y=171.00, z=147.34], afv['Skeleton'/571288, l='MpServer', x=240.50, y=130.00, z=101.50], abv['Cow'/571265, l='MpServer', x=230.53, y=102.00, z=185.53], abv['Cow'/571264, l='MpServer', x=225.53, y=87.00, z=157.53], abv['Cow'/571266, l='MpServer', x=226.53, y=105.00, z=224.44], abr['Bat'/578317, l='MpServer', x=181.86, y=32.16, z=159.51], aeq['Creeper'/577223, l='MpServer', x=207.50, y=87.00, z=216.16], agh['Zombie'/579987, l='MpServer', x=228.50, y=149.00, z=111.50], adx['item.item.arrow'/570870, l='MpServer', x=187.09, y=131.00, z=152.69], abv['Cow'/570868, l='MpServer', x=189.53, y=111.00, z=152.69], adx['item.item.bone'/570869, l='MpServer', x=187.88, y=131.00, z=152.63], abv['Cow'/570866, l='MpServer', x=186.56, y=111.00, z=149.22], abv['Cow'/570867, l='MpServer', x=186.81, y=111.00, z=152.84], abv['Cow'/570865, l='MpServer', x=188.25, y=111.00, z=153.53], cin['declanblock'/570871, l='MpServer', x=166.28, y=134.43, z=163.67], afv['Skeleton'/575034, l='MpServer', x=112.44, y=41.00, z=113.78], adl['entity.ItemFrame.name'/570855, l='MpServer', x=196.97, y=112.50, z=163.50], adl['entity.ItemFrame.name'/570854, l='MpServer', x=196.97, y=112.50, z=162.50], agn['Villager'/570853, l='MpServer', x=203.69, y=114.00, z=171.47], agn['Villager'/570852, l='MpServer', x=200.50, y=114.00, z=175.69], agn['Villager'/570851, l='MpServer', x=196.69, y=114.00, z=169.28], agn['Villager'/570850, l='MpServer', x=198.47, y=114.00, z=169.28], aeb['container.minecart'/570849, l='MpServer', x=204.50, y=107.06, z=169.50], agn['Villager'/570848, l='MpServer', x=192.28, y=132.00, z=184.69], adn['Painting'/570863, l='MpServer', x=192.00, y=133.00, z=175.97], adn['Painting'/570862, l='MpServer', x=192.00, y=134.50, z=175.97], afv['Skeleton'/580564, l='MpServer', x=90.44, y=65.00, z=224.53], agn['Villager'/570861, l='MpServer', x=203.69, y=114.00, z=173.28], adl['entity.ItemFrame.name'/570860, l='MpServer', x=196.97, y=112.50, z=161.50], agn['Villager'/570859, l='MpServer', x=198.28, y=114.00, z=175.50], adj['Armour Stand'/570858, l='MpServer', x=194.50, y=116.00, z=167.50], agn['Villager'/570857, l='MpServer', x=200.69, y=114.00, z=169.28], agn['Villager'/570856, l='MpServer', x=196.31, y=114.00, z=175.47], abw['Donkey'/570836, l='MpServer', x=187.63, y=105.00, z=173.09], agn['Villager'/570837, l='MpServer', x=190.75, y=124.00, z=175.13], agn['Villager'/570838, l='MpServer', x=191.44, y=124.15, z=175.69], adl['entity.ItemFrame.name'/570839, l='MpServer', x=197.03, y=111.50, z=157.50], adx['item.item.egg'/570832, l='MpServer', x=126.69, y=78.00, z=197.81], abu['Chicken'/570833, l='MpServer', x=126.50, y=78.00, z=197.38], agn['Villager'/570834, l='MpServer', x=114.69, y=170.00, z=206.66], agn['Villager'/570835, l='MpServer', x=114.28, y=170.00, z=205.28], agn['Villager'/570844, l='MpServer', x=194.59, y=132.00, z=178.41], agn['Villager'/570845, l='MpServer', x=192.31, y=124.50, z=175.13], agn['Villager'/570846, l='MpServer', x=194.50, y=137.06, z=181.50], aeh['entity.MinecartRideable.name'/570847, l='MpServer', x=194.50, y=137.06, z=181.50], adj['Armour Stand'/570840, l='MpServer', x=197.50, y=110.00, z=156.50], abr['Bat'/576698, l='MpServer', x=178.56, y=22.84, z=152.25], acr['Iron Golem'/570841, l='MpServer', x=194.16, y=132.06, z=182.69], agn['Villager'/570842, l='MpServer', x=197.66, y=132.00, z=183.91], agn['Villager'/570843, l='MpServer', x=192.78, y=132.00, z=183.88], agn['Villager'/570823, l='MpServer', x=92.69, y=170.00, z=206.22], agn['Villager'/570829, l='MpServer', x=103.56, y=170.00, z=196.69], agn['Villager'/570828, l='MpServer', x=101.28, y=170.00, z=196.69], agn['Villager'/570831, l='MpServer', x=101.28, y=170.00, z=196.69], agn['Villager'/570830, l='MpServer', x=102.72, y=170.00, z=196.28], agn['Villager'/570825, l='MpServer', x=92.50, y=170.00, z=207.13], agn['Villager'/570824, l='MpServer', x=92.28, y=170.00, z=205.28], agn['Villager'/570827, l='MpServer', x=101.28, y=170.00, z=196.28], agh['Zombie'/571167, l='MpServer', x=181.50, y=88.00, z=184.50], agh['Zombie'/580971, l='MpServer', x=214.50, y=110.00, z=202.50], abv['Cow'/571153, l='MpServer', x=166.44, y=74.00, z=227.28], adx['item.item.bone'/571152, l='MpServer', x=166.69, y=74.00, z=227.06], abu['Chicken'/571154, l='MpServer', x=164.59, y=76.00, z=240.59], abu['Chicken'/571148, l='MpServer', x=167.34, y=73.72, z=229.19], abu['Chicken'/571149, l='MpServer', x=165.97, y=73.50, z=233.38], abu['Chicken'/571150, l='MpServer', x=160.63, y=77.00, z=239.38], abu['Chicken'/571144, l='MpServer', x=163.38, y=62.67, z=127.94], adx['item.item.egg'/571145, l='MpServer', x=166.81, y=59.00, z=113.97], adx['item.item.egg'/571146, l='MpServer', x=162.34, y=60.00, z=127.56], abu['Chicken'/571147, l='MpServer', x=160.44, y=57.00, z=181.41], abu['Chicken'/571142, l='MpServer', x=161.19, y=62.47, z=111.81], abu['Chicken'/571143, l='MpServer', x=165.53, y=62.56, z=114.25], abv['Cow'/571197, l='MpServer', x=203.53, y=170.00, z=138.28], agh['Zombie'/571196, l='MpServer', x=207.50, y=76.00, z=129.50], agh['Zombie'/571195, l='MpServer', x=207.50, y=76.00, z=128.50], agh['Zombie'/571194, l='MpServer', x=205.72, y=77.59, z=126.71], abr['Bat'/579570, l='MpServer', x=115.25, y=52.00, z=112.53], abu['Chicken'/571193, l='MpServer', x=190.59, y=62.53, z=90.44], abr['Bat'/579583, l='MpServer', x=119.39, y=45.68, z=117.48], aeq['Creeper'/580396, l='MpServer', x=240.50, y=150.00, z=98.50], abv['Cow'/571172, l='MpServer', x=180.84, y=75.00, z=238.03], abv['Cow'/571173, l='MpServer', x=185.34, y=98.00, z=247.53], adx['item.item.bone'/571170, l='MpServer', x=187.38, y=94.00, z=219.41], agh['Zombie'/580950, l='MpServer', x=119.50, y=44.00, z=114.50], abv['Cow'/571171, l='MpServer', x=178.19, y=95.00, z=210.41], agh['Zombie'/580949, l='MpServer', x=118.50, y=44.00, z=117.50], afv['Skeleton'/571216, l='MpServer', x=209.63, y=75.00, z=135.38], acd['Rabbit'/571221, l='MpServer', x=217.53, y=162.00, z=151.75], acd['Rabbit'/571220, l='MpServer', x=219.28, y=158.00, z=150.28], adx['item.item.rottenFlesh'/571223, l='MpServer', x=214.13, y=113.00, z=180.13], acd['Rabbit'/571222, l='MpServer', x=218.28, y=162.00, z=150.50], abv['Cow'/571214, l='MpServer', x=211.53, y=173.00, z=91.69], agh['Zombie'/571259, l='MpServer', x=236.50, y=145.00, z=97.50], afv['Skeleton'/571258, l='MpServer', x=226.34, y=138.00, z=96.28], agh['Zombie'/571257, l='MpServer', x=225.94, y=139.00, z=97.56], agh['Zombie'/571263, l='MpServer', x=233.50, y=150.00, z=112.50], abr['Bat'/574152, l='MpServer', x=143.06, y=36.00, z=211.16], agh['Zombie'/571261, l='MpServer', x=234.50, y=145.00, z=109.50], agh['Zombie'/571251, l='MpServer', x=225.50, y=140.00, z=98.50], afv['Skeleton'/571250, l='MpServer', x=239.53, y=138.00, z=111.16], aeq['Creeper'/571249, l='MpServer', x=239.69, y=128.00, z=100.28], agh['Zombie'/571255, l='MpServer', x=224.50, y=140.00, z=107.50], agc['Spider'/571253, l='MpServer', x=226.13, y=140.00, z=100.13], abr['Bat'/577047, l='MpServer', x=147.75, y=31.10, z=124.25], afv['Skeleton'/571252, l='MpServer', x=229.50, y=140.00, z=101.50], agh['Zombie'/571242, l='MpServer', x=237.28, y=106.00, z=100.72], agh['Zombie'/571243, l='MpServer', x=224.91, y=110.00, z=109.34], afv['Skeleton'/571240, l='MpServer', x=239.50, y=140.00, z=91.50], aeq['Creeper'/571246, l='MpServer', x=237.50, y=135.00, z=98.50], agh['Zombie'/571247, l='MpServer', x=228.50, y=139.00, z=98.50], agh['Zombie'/571244, l='MpServer', x=237.50, y=105.00, z=97.50], afv['Skeleton'/571245, l='MpServer', x=228.50, y=140.00, z=99.50], afv['Skeleton'/571238, l='MpServer', x=236.50, y=138.00, z=90.50], aeq['Creeper'/571239, l='MpServer', x=234.50, y=140.00, z=90.50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at cem.a(SourceFile:308)
	at bss.b(SourceFile:2278)
	at bss.a(SourceFile:326)
	at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
	Minecraft Version: 1.8.1
	Operating System: Windows 8.1 (amd64) version 6.3
	Java Version: 1.7.0_71, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 475026912 bytes (453 MB) / 997531648 bytes (951 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 57, allocated: 12, tallocated: 94
	Launched Version: 1.8.1
	LWJGL: 2.9.1
	OpenGL: AMD Radeon HD 8670D GL version 4.2.12420 Compatibility Profile Context 13.151.0.0, ATI Technologies Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: Yes
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (UK)
	Profiler Position: N/A (disabled)

Dylan Edwards 2014-11-27T09:32:21Z

Mindcrack had this issue a while ago
https://www.youtube.com/watch?v=ePlui8cooBw&list=UUFKDEp9si4RmHFWJW1vYsMA

marcono1234 2015-11-04T21:58:54Z

Can you please provide the point of time when in the video this is visible?

user-f2760 2016-03-13T16:52:31Z

The enviroment is supposed to contain pc details.

40 more comments

Sondre Grimsmo Sinnes 2016-03-22T11:25:49Z

[11:58:53] [Server thread/INFO]: Starting integrated minecraft server version 1.9
[11:58:53] [Server thread/INFO]: Generating keypair
[11:58:53] [Server thread/INFO]: Preparing start region for level 0
[11:58:54] [Server thread/INFO]: Preparing spawn area: 66%
[11:58:55] [Server thread/INFO]: Changing view distance to 15, from 10
[11:58:55] [Server thread/INFO]: Sondre666GS[local:E:a323baab] logged in with entity id 3101477 at (1782.5997347220666, 63.0, -409.76220315725914)
[11:58:55] [Server thread/INFO]: Sondre666GS joined the game
[11:58:56] [Server thread/ERROR]: Chunk file at 112,-26 is in the wrong location; relocating. (Expected 112, -26, got 117, -30)
[11:58:56] [Server thread/WARN]: Wrong location! (117, -30) should be (112, -26), yw['Skeleton'/3101758, l='Homenkollen', x=1877,50, y=16,00, z=-464,50]
[11:58:56] [Server thread/WARN]: Wrong location! (117, -30) should be (112, -26), za['Zombie'/3101759, l='Homenkollen', x=1880,30, y=55,00, z=-472,93]
[11:58:56] [Server thread/WARN]: Wrong location! (117, -30) should be (112, -26), za['Zombie'/3101760, l='Homenkollen', x=1879,52, y=55,00, z=-475,22]
[11:58:56] [Server thread/WARN]: Wrong location! (117, -30) should be (112, -26), yi['Creeper'/3101761, l='Homenkollen', x=1886,50, y=55,00, z=-472,50]
[11:58:56] [Server thread/WARN]: Wrong location! (117, -30) should be (112, -26), we['Sheep'/3101762, l='Homenkollen', x=1880,48, y=69,00, z=-473,74]
[11:58:56] [Server thread/WARN]: Tried to add entity Skeleton but it was marked as removed already
[11:58:56] [Server thread/WARN]: Tried to add entity Zombie but it was marked as removed already
[11:58:56] [Server thread/WARN]: Tried to add entity Zombie but it was marked as removed already
[11:58:56] [Server thread/WARN]: Tried to add entity Creeper but it was marked as removed already
[11:58:56] [Server thread/WARN]: Tried to add entity Sheep but it was marked as removed already
[11:58:56] [Server thread/ERROR]: Chunk file at 114,-22 is in the wrong location; relocating. (Expected 114, -22, got 117, -23)
[11:58:56] [Server thread/WARN]: Wrong location! (117, -23) should be (114, -22), yi['Creeper'/3101780, l='Homenkollen', x=1885,50, y=26,00, z=-367,50]
[11:58:56] [Server thread/WARN]: Wrong location! (117, -23) should be (114, -22), za['Zombie'/3101781, l='Homenkollen', x=1885,50, y=26,00, z=-366,50]
[11:58:56] [Server thread/WARN]: Wrong location! (117, -23) should be (114, -22), za['Zombie'/3101782, l='Homenkollen', x=1883,50, y=26,00, z=-366,50]
[11:58:56] [Server thread/WARN]: Tried to add entity Creeper but it was marked as removed already
[11:58:56] [Server thread/WARN]: Tried to add entity Zombie but it was marked as removed already
[11:58:56] [Server thread/WARN]: Tried to add entity Zombie but it was marked as removed already
[11:58:56] [Server thread/ERROR]: Chunk file at 117,-30 is in the wrong location; relocating. (Expected 117, -30, got 109, -22)
[11:58:56] [Server thread/WARN]: Wrong location! (109, -22) should be (117, -30), we['Sheep'/3101815, l='Homenkollen', x=1750,34, y=76,00, z=-345,25]
[11:58:56] [Server thread/WARN]: Tried to add entity Sheep but it was marked as removed already
[11:58:57] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2103ms behind, skipping 42 tick(s)
[12:01:55] [Client thread/INFO]: [CHAT] Saved screenshot as 2016-03-22_12.01.55.png
[12:01:56] [Server thread/INFO]: Saving and pausing game...
[12:01:56] [Server thread/INFO]: Saving chunks for level 'Homenkollen'/Overworld
[12:01:56] [Server thread/INFO]: Saving chunks for level 'Homenkollen'/Nether
[12:01:56] [Server thread/INFO]: Saving chunks for level 'Homenkollen'/The End
[12:01:58] [Server thread/INFO]: Saving and pausing game...
[12:01:58] [Server thread/INFO]: Saving chunks for level 'Homenkollen'/Overworld
[12:01:58] [Server thread/INFO]: Saving chunks for level 'Homenkollen'/Nether
[12:01:58] [Server thread/INFO]: Saving chunks for level 'Homenkollen'/The End
[12:02:00] [Server thread/INFO]: Stopping server
[12:02:00] [Server thread/INFO]: Saving players
[12:02:00] [Server thread/INFO]: Saving worlds
[12:02:00] [Server thread/INFO]: Saving chunks for level 'Homenkollen'/Overworld
[12:02:00] [Server thread/INFO]: Saving chunks for level 'Homenkollen'/Nether
[12:02:00] [Server thread/INFO]: Saving chunks for level 'Homenkollen'/The End
[12:02:01] [Client thread/INFO]: Stopping!
[12:02:01] [Client thread/INFO]: SoundSystem shutting down...
[12:02:01] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

A chunk appeared out of nowhere where my house was in my singleplayerworld. this is what i pulled out of game output.

Bachsau 2016-03-22T16:10:15Z

According to MC-90885 this seems to be somehow connected to specific worlds, so it might be of help if someone affected would upload his world. You could also start versioning your world with git whenever you exit a game for the developers to see what was going on before and after this occured.

Sondre Grimsmo Sinnes 2016-03-23T00:08:55Z

It has happen before, but it occurs when i travel via air (creative, elytra etc.). really annoying.
http://www.mediafire.com/download/tx9m99cnn6qskoe/Homenkollen.zip <- link to save file .zip
(latest java 64-bit)

[Bot] Arisa 2016-03-23T00:09:06Z

Your Java version is out of date!

On Windows, you can use the Minecraft Installer which includes the latest version of Java.
Otherwise, please manually update your Java to the latest version: http://www.java.com/en/download/.
It is recommended you uninstall any outdated versions prior to upgrading.
When using a 32-bit browser on a 64-bit operating system the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp.

Please report if the issue persists with the latest Java version.
For technical support please use the Mojang Support Center.

--- This action was performed automagically. If you believe this was done erroneously, please :light_bulb_on: raise an issue.

Bachsau 2016-04-14T06:57:06Z

I think there must be something wrong with your CPU or RAM as this doesn't ever happen to most people while it always happens to you.

Samuel Voeller 2016-04-15T13:53:39Z

@unknown, I doubt its a CPU or RAM Issue. Because he can still play the game.

My guess would be check hard-drive space, I know that happens with low space.

Heege McGee 2016-04-26T15:03:13Z

Just went through cleaning up some file corruption related to this. I was able to identify damaged files using Fenixin's Minecraft-Region-Fixer.

In our case (1.9 multiplayer survival server), the logs showed FileIO errors about writing chunks, and it was immediately apparent that our backup script had filled the disk.

So the code was at least provided with an opportunity for error, when it's unable to push the chunk to disk. I think safe behavior for now would be to simply crash the server on write error, to prevent corruption.

Our files were so bad, a player was unable to login, and I couldn't locate the damaged files effectively without some help from google and third-party python scripts. I can certainly say my preference would have been to simply lose the changes since the first IO error, rather than troublesome restoration by hand with python or mcedit.

side note for anyone else cleaning up corruption: Minecraft-Region-Fixer is old, and a little obtuse, so it wasn't able to do a chunk based repair for me. Kept crashing on the replace_chunks activities. Nevertheless, the --log= option dumped out a complete listing of chunks and the region files they were in - i simply restored the 5 afflicted files by hand.

CubeTheThird 2016-06-27T23:15:48Z

Linking game output from MC-104675.

Bachsau 2016-06-27T23:20:34Z

Hey, Mojang! This seems very special. Don't you think it is definitely worth further investigation even if only a small number of players is affected?

C.J. Bennett 2016-06-27T23:55:20Z

I already tried what you suggested, Bot Arisa, but this hasn't done anything to fix the problem.

C.J. Bennett 2016-09-02T18:18:26Z

I see that you have my problem set as "resolved." It JUST happened to me again. All of my drivers and such are FULLY up to date. THIS is what I saw. This problem is NOT "resolved." I've done everything that i could find on the web but the situation hasn't changed. I can appreciate that you guys are busy people, but at least acknowledge the problem instead of pretending it's fixed because that will only result in an even more frustrated customers. I don't think anyone wants that. After all, all these people are telling you this because they love the game, as do I.

Completely ignored arguments: [--nativeLauncherVersion, 307]
[10:52:58] [Client thread/INFO]: Setting user: BennettTheBlack
[10:52:59] [Client thread/WARN]: Skipping bad option: lastServer:
[10:52:59] [Client thread/INFO]: LWJGL Version: 2.9.4
[10:53:00] [Client thread/INFO]: Reloading ResourceManager: Default
[10:53:11] [Sound Library Loader/INFO]: Starting up SoundSystem...
[10:53:11] [Thread-5/INFO]: Initializing LWJGL OpenAL
[10:53:11] [Thread-5/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[10:53:11] [Thread-5/INFO]: OpenAL initialized.
[10:53:11] [Sound Library Loader/INFO]: Sound engine started
[10:53:12] [Client thread/INFO]: Created: 1024x512 textures-atlas
[11:13:27] [Client thread/ERROR]: Exception reading C:\Users\Cameron\AppData\Roaming\.minecraft\saves\A Whole New World\level.dat
java.util.zip.ZipException: Not in GZIP format
	at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:165) ~[?:1.8.0_25]
	at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:79) ~[?:1.8.0_25]
	at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:91) ~[?:1.8.0_25]
	at ea.a(SourceFile:24) ~[1.10.2.jar:?]
	at azz.a(SourceFile:82) [1.10.2.jar:?]
	at azz.c(SourceFile:66) [1.10.2.jar:?]
	at azw.b(SourceFile:57) [1.10.2.jar:?]
	at big.e(SourceFile:35) [1.10.2.jar:?]
	at big.<init>(SourceFile:28) [1.10.2.jar:?]
	at bie.b(SourceFile:43) [1.10.2.jar:?]
	at bft.a(SourceFile:372) [1.10.2.jar:?]
	at bcx.a(SourceFile:900) [1.10.2.jar:?]
	at bga.a(SourceFile:237) [1.10.2.jar:?]
	at bft.a(SourceFile:346) [1.10.2.jar:?]
	at bga.a(SourceFile:498) [1.10.2.jar:?]
	at bft.k(SourceFile:409) [1.10.2.jar:?]
	at bft.p(SourceFile:386) [1.10.2.jar:?]
	at bcx.t(SourceFile:1586) [1.10.2.jar:?]
	at bcx.av(SourceFile:968) [1.10.2.jar:?]
	at bcx.a(SourceFile:396) [1.10.2.jar:?]
	at net.minecraft.client.main.Main.main(SourceFile:124) [1.10.2.jar:?]
[11:13:27] [Client thread/ERROR]: Exception reading C:\Users\Cameron\AppData\Roaming\.minecraft\saves\A Whole New World\level.dat_old
java.util.zip.ZipException: Not in GZIP format
	at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:165) ~[?:1.8.0_25]
	at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:79) ~[?:1.8.0_25]
	at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:91) ~[?:1.8.0_25]
	at ea.a(SourceFile:24) ~[1.10.2.jar:?]
	at azz.a(SourceFile:82) [1.10.2.jar:?]
	at azz.c(SourceFile:74) [1.10.2.jar:?]
	at azw.b(SourceFile:57) [1.10.2.jar:?]
	at big.e(SourceFile:35) [1.10.2.jar:?]
	at big.<init>(SourceFile:28) [1.10.2.jar:?]
	at bie.b(SourceFile:43) [1.10.2.jar:?]
	at bft.a(SourceFile:372) [1.10.2.jar:?]
	at bcx.a(SourceFile:900) [1.10.2.jar:?]
	at bga.a(SourceFile:237) [1.10.2.jar:?]
	at bft.a(SourceFile:346) [1.10.2.jar:?]
	at bga.a(SourceFile:498) [1.10.2.jar:?]
	at bft.k(SourceFile:409) [1.10.2.jar:?]
	at bft.p(SourceFile:386) [1.10.2.jar:?]
	at bcx.t(SourceFile:1586) [1.10.2.jar:?]
	at bcx.av(SourceFile:968) [1.10.2.jar:?]
	at bcx.a(SourceFile:396) [1.10.2.jar:?]
	at net.minecraft.client.main.Main.main(SourceFile:124) [1.10.2.jar:?]
[11:13:29] [Server thread/INFO]: Starting integrated minecraft server version 1.10.2
[11:13:29] [Server thread/INFO]: Generating keypair
[11:13:29] [Server thread/INFO]: Preparing start region for level 0
[11:13:30] [Server thread/INFO]: Preparing spawn area: 29%
[11:13:30] [Server thread/WARN]: Keeping entity Villager that already exists with UUID 9da4c1a2-2843-4e19-8c76-9689e9ac177c
[11:13:31] [Server thread/ERROR]: Chunk file at 81,70 is in the wrong location; relocating. (Expected 81, 70, got 90, 72)
[11:13:31] [Server thread/WARN]: Wrong location! (90, 72) should be (81, 70), zi['Zombie'/282, l='Bennett's Kingdom', x=1441.50, y=24.00, z=1159.50]
[11:13:31] [Server thread/WARN]: Wrong location! (90, 72) should be (81, 70), zd['Skeleton'/283, l='Bennett's Kingdom', x=1440.50, y=39.00, z=1158.50]
[11:13:31] [Server thread/WARN]: Tried to add entity Zombie but it was marked as removed already
[11:13:31] [Server thread/WARN]: Tried to add entity Skeleton but it was marked as removed already
[11:13:31] [Server thread/INFO]: Changing view distance to 12, from 10
[11:13:31] [Server thread/INFO]: BennettTheBlack[local:E:a1946307] logged in with entity id 310 at (1339.8424725278, 69.0625, 1131.053692166218)
[11:13:31] [Server thread/INFO]: BennettTheBlack joined the game
[11:13:32] [Server thread/WARN]: Keeping entity Chicken that already exists with UUID be4c7edd-9878-40e0-bcb6-d770796e091f
[11:13:32] [Server thread/ERROR]: Chunk file at 86,66 is in the wrong location; relocating. (Expected 86, 66, got 82, 74)
[11:13:32] [Server thread/ERROR]: Chunk file at 86,68 is in the wrong location; relocating. (Expected 86, 68, got 86, 66)
[11:13:32] [Server thread/WARN]: Wrong location! (86, 66) should be (86, 68), yp['Creeper'/716, l='Bennett's Kingdom', x=1385.50, y=17.00, z=1069.50]
[11:13:32] [Server thread/WARN]: Tried to add entity Creeper but it was marked as removed already
[11:13:32] [Server thread/ERROR]: Chunk file at 87,75 is in the wrong location; relocating. (Expected 87, 75, got 85, 74)
[11:13:32] [Server thread/WARN]: Wrong location! (85, 74) should be (87, 75), zd['Skeleton'/737, l='Bennett's Kingdom', x=1363.50, y=49.00, z=1191.50]
[11:13:32] [Server thread/WARN]: Wrong location! (85, 74) should be (87, 75), yp['Creeper'/738, l='Bennett's Kingdom', x=1360.50, y=49.00, z=1191.50]
[11:13:32] [Server thread/WARN]: Tried to add entity Skeleton but it was marked as removed already
[11:13:32] [Server thread/WARN]: Tried to add entity Creeper but it was marked as removed already
[11:13:32] [Server thread/ERROR]: Chunk file at 88,71 is in the wrong location; relocating. (Expected 88, 71, got 86, 76)
[11:13:32] [Server thread/WARN]: Wrong location! (86, 76) should be (88, 71), zh['Witch'/752, l='Bennett's Kingdom', x=1380.50, y=28.00, z=1221.50]
[11:13:32] [Server thread/WARN]: Wrong location! (86, 76) should be (88, 71), zh['Witch'/753, l='Bennett's Kingdom', x=1377.50, y=28.00, z=1222.50]
[11:13:32] [Server thread/WARN]: Tried to add entity Witch but it was marked as removed already
[11:13:32] [Server thread/WARN]: Tried to add entity Witch but it was marked as removed already
[11:13:32] [Server thread/ERROR]: Chunk file at 89,72 is in the wrong location; relocating. (Expected 89, 72, got 81, 70)
[11:13:32] [Server thread/ERROR]: Chunk file at 90,72 is in the wrong location; relocating. (Expected 90, 72, got 83, 71)
[11:13:32] [Server thread/WARN]: Wrong location! (83, 71) should be (90, 72), aar['Minecart with Chest'/772, l='Bennett's Kingdom', x=1342.50, y=9.06, z=1138.88]
[11:13:32] [Server thread/WARN]: Tried to add entity MinecartChest but it was marked as removed already
[11:14:07] [Server thread/INFO]: Saving and pausing game...
[11:14:07] [Server thread/INFO]: Saving chunks for level 'Bennett's Kingdom'/Overworld
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(SourceFile:214)
	at bzl.C(SourceFile:145)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
[11:14:07] [Server thread/INFO]: Saving chunks for level 'Bennett's Kingdom'/Nether
[11:14:07] [Server thread/INFO]: Saving chunks for level 'Bennett's Kingdom'/The End
[11:14:08] [Server thread/INFO]: Stopping server
[11:14:08] [Server thread/INFO]: Saving players
[11:14:08] [Server thread/INFO]: Saving worlds
[11:14:08] [Server thread/INFO]: Saving chunks for level 'Bennett's Kingdom'/Overworld
[11:14:08] [Server thread/INFO]: Saving chunks for level 'Bennett's Kingdom'/Nether
[11:14:08] [Server thread/INFO]: Saving chunks for level 'Bennett's Kingdom'/The End
[11:14:09] [Client thread/INFO]: Stopping!
[11:14:09] [Client thread/INFO]: SoundSystem shutting down...
[11:14:10] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

C.J. Bennett 2016-09-02T18:25:03Z

[10:49:40 INFO]: Minecraft Launcher 1.6.61 (through bootstrap 100) started on windows...
[10:49:41 INFO]: Current time is Sep 2, 2016 10:49:41 AM
[10:49:41 INFO]: System.getProperty('os.name') == 'Windows 10'
[10:49:41 INFO]: System.getProperty('os.version') == '10.0'
[10:49:41 INFO]: System.getProperty('os.arch') == 'amd64'
[10:49:41 INFO]: System.getProperty('java.version') == '1.8.0_25'
[10:49:41 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[10:49:41 INFO]: System.getProperty('sun.arch.data.model') == '64'
[10:49:41 INFO]: proxy == DIRECT
[10:49:47 INFO]: JFX is already initialized
[10:49:58 INFO]: Refreshing local version list...
[10:49:59 INFO]: Refreshing remote version list...
[10:50:07 INFO]: Refresh complete.
[10:50:08 INFO]: Loaded 1 profile(s); selected 'RougueWolf'
[10:50:08 INFO]: Refreshing auth...
[10:50:08 INFO]: Logging in with access token
[10:52:48 INFO]: Getting syncinfo for selected version
[10:52:48 INFO]: Queueing library & version downloads
[10:52:48 INFO]: Download job 'Version & Libraries' started (16 threads, 33 files)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput-platform\2.0.5\jinput-platform-2.0.5-natives-windows.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.22\authlib-1.5.22.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\mojang\netty\1.6\netty-1.6.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.3.2\commons-lang3-3.3.2.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\oshi-project\oshi-core\1.1\oshi-core-1.1.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\17.0\guava-17.0.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.4-nightly-20150209\lwjgl-platform-2.9.4-nightly-20150209-natives-windows.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar for job 'Version & Libraries'... (try 0)
[10:52:48 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Download job 'Resources' skipped as there are no files to download
[10:52:56 INFO]: Job 'Resources' finished successfully (took 0:00:00.000)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\17.0\guava-17.0.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\platform\3.4.0\platform-3.4.0.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.4-nightly-20150209\lwjgl-2.9.4-nightly-20150209.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.9.5\realms-1.9.5.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput-platform\2.0.5\jinput-platform-2.0.5-natives-windows.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.4-nightly-20150209\lwjgl_util-2.9.4-nightly-20150209.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.3.2\commons-lang3-3.3.2.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\jna\3.4.0\jna-3.4.0.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.4-nightly-20150209\lwjgl-platform-2.9.4-nightly-20150209-natives-windows.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\mojang\netty\1.6\netty-1.6.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\it\unimi\dsi\fastutil\7.0.12_mojang\fastutil-7.0.12_mojang.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\oshi-project\oshi-core\1.1\oshi-core-1.1.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.22\authlib-1.5.22.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Attempting to download C:\Users\Cameron\AppData\Roaming\.minecraft\versions\1.10.2\1.10.2.jar for job 'Version & Libraries'... (try 0)
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.4-nightly-20150209\lwjgl_util-2.9.4-nightly-20150209.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\platform\3.4.0\platform-3.4.0.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.9.5\realms-1.9.5.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\it\unimi\dsi\fastutil\7.0.12_mojang\fastutil-7.0.12_mojang.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.4-nightly-20150209\lwjgl-2.9.4-nightly-20150209.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\jna\3.4.0\jna-3.4.0.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Finished downloading C:\Users\Cameron\AppData\Roaming\.minecraft\versions\1.10.2\1.10.2.jar for job 'Version & Libraries': Local file matches hash, using that
[10:52:56 INFO]: Job 'Version & Libraries' finished successfully (took 0:00:07.992)
[10:52:56 INFO]: Launching game
[10:52:56 INFO]: Unpacking natives to C:\Users\Cameron\AppData\Roaming\.minecraft\versions\1.10.2\1.10.2-natives-418793189111
[10:52:56 INFO]: Launching in C:\Users\Cameron\AppData\Roaming\.minecraft
[10:52:56 INFO]: Half command: C:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_25\bin\javaw.exe -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -Dos.name=Windows 10 -Dos.version=10.0 -Djava.library.path=C:\Users\Cameron\AppData\Roaming\.minecraft\versions\1.10.2\1.10.2-natives-418793189111 -cp C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\mojang\netty\1.6\netty-1.6.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\oshi-project\oshi-core\1.1\oshi-core-1.1.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\jna\3.4.0\jna-3.4.0.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\platform\3.4.0\platform-3.4.0.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.6\jopt-simple-4.6.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.0.23.Final\netty-all-4.0.23.Final.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\17.0\guava-17.0.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.3.2\commons-lang3-3.3.2.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.9\commons-codec-1.9.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.4\gson-2.2.4.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.22\authlib-1.5.22.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.9.5\realms-1.9.5.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\it\unimi\dsi\fastutil\7.0.12_mojang\fastutil-7.0.12_mojang.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.0-beta9\log4j-api-2.0-beta9.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.0-beta9\log4j-core-2.0-beta9.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.4-nightly-20150209\lwjgl-2.9.4-nightly-20150209.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.4-nightly-20150209\lwjgl_util-2.9.4-nightly-20150209.jar;C:\Users\Cameron\AppData\Roaming\.minecraft\versions\1.10.2\1.10.2.jar net.minecraft.client.main.Main
[10:52:57 INFO]: Looking for orphaned versions to clean up...
[10:52:58 INFO]: Looking for old natives & assets to clean up...
[11:14:10 INFO]: Game ended with no troubles detected (exit code 0)
[11:14:10 INFO]: Deleting C:\Users\Cameron\AppData\Roaming\.minecraft\versions\1.10.2\1.10.2-natives-418793189111
[11:14:10 WARN]: Couldn't delete C:\Users\Cameron\AppData\Roaming\.minecraft\versions\1.10.2\1.10.2-natives-418793189111 -

Skylinerw 2016-09-02T18:50:42Z

at least acknowledge the problem instead of pretending it's fixed

This bug report is not marked as resolved or fixed. Your report was resolved as a duplicate of this report. "Resolved" does not mean "fixed". You can see the resolution underneath the status.

This report:

[media]

Your duplicate report:

[media]

Bachsau 2016-09-02T20:59:00Z

Look like some sort of file access problems. Check your access rights and filesystem.

But I still don't get why it continues to start when it can read neither level.dat nor level_dat.old. It definitely shouldn't!

C.J. Bennett 2016-09-05T02:40:46Z

If it helps, I can report a secondary nature to the bug I had not previously observed yet.

As I was playing around in a new world at some point I had noticed that some animals had been " copied" or randomly generated into the world from nothing I can really find. I had moved some cows and sheep to a new ranching area and for all I know , likewise with the map being regenerated, the same could've been applied to said animals regenerating to where the game "remembered" them being.

Although there is the possibility of these instances being unrelated in nature. Or not, I'm not too knowledgeable about coding and the like. It sounds like a good possibility though. And I must confess, I'm pretty confident about not seeing this reported by the others which makes me question if this is a unique feature to me or if this bug is not exactly the same as the others.

Bachsau 2016-09-05T06:27:38Z

@C.J. Bennett: No, it doesn't help anyone if you grab some random bug report and talk about something completely different. Furthermore I can't find anything buggy in what you describe.

C.J. Bennett 2016-09-10T17:05:13Z

I was adding some possible insight to maybe help identify what's causing the problem.

And what am I looking for in file systems and access rights?

Also, how do I access it?

Bachsau 2016-09-10T23:57:44Z

@C.J. Bennett: Right click your minecraft save folder, choose "properties", then "security" tab. Use Google and/or Wikipedia for further information on Windows access rights. However, this was an on-topic comment and might not effect your problem, which I think is not part of any bug at all.

If you think it is, please open another bug report! This one is about misplaced chunks, not about animals spawning in unexpected places.

C.J. Bennett 2016-09-11T00:42:48Z

Thank you. I tried looking at tutorials, but they didn't help me get there.

But if it isn't that then do you think it's a problem with my computer? Like a problem with it mixing data?

And you stated previously that someone should upload their world, if that offer still stands, I'm not sure how to, but I'm willing to find and submit my own. If it'll help that is.

Jeffrey King 2016-10-13T16:33:21Z

I just had this occur in 16w40a. Screenshot is attached. When I created a new world with the same seed, the chunk swapping did not occur - I was unable to reproduce it.

Coby Z 2016-12-30T04:14:42Z

Not sure if this helps, but with a server I was hosting on my computer, I forgot to properly halt the server before shutting down, and I came back to the chunks being swapped around, as you describe. Perhaps the issue is insufficient resources being dedicated to saving the chunks in the proper location? This is just a hypothesis, as I have very little knowledge of the inner workings of Java.

C.J. Bennett 2017-01-06T00:52:49Z

@ Jeffrey King

If you keep opening and closing the world, eventually the same thing will occur. Maybe not in the same way but a chunk WILL eventually swap or corrupt.

Johnny Gates 2017-01-15T22:54:10Z

Pulled this one out of mine it was from 1.11.2 I was using OptiFine at the time does that effect the chunks?

Pushpak Gupta 2017-03-30T17:39:12Z

same with me, i have posted this issue earlier named "Chunk Exchange Error"

Alawnely 2017-04-04T10:12:21Z

Check out this video similar to the bug: https://youtu.be/n0kokAHe6cw?t=1m16s

Clavis Fly 2017-06-20T04:19:47Z

Does anyone know if re-downloading the game helps? 😛

Luciano Phillips 2017-09-14T15:24:55Z

I do have this issue right after creating a world. Displaced chunks everywhere....

Clavis Fly 2017-09-15T01:00:04Z

The only help online for this bug is using MC edit to restore chunks. I would like to know if i could stop it from happening in the future, i tried a re-download and it didn't change anything.

Heege McGee 2018-01-23T21:40:39Z

The fix for this bug is for Minecraft to crash when it has errors writing chunks to disk. See my earlier comment (from 2016):
https://bugs.mojang.com/browse/MC-74762?focusedCommentId=301720&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-301720

marcono1234 2018-01-23T23:22:33Z

In our case (1.9 multiplayer survival server), the logs showed FileIO errors about writing chunks, and it was immediately apparent that our backup script had filled the disk.

@@unknown, I am sorry that this is a little bit late, but could you please attach your log file, or the part which contains the "FileIO error"?

Heege McGee 2018-01-24T17:20:34Z

That server is long gone, friends. However, you can replicate the issue in the following way:

1. Get yourself a linux server
2. Get the minecraft server running, connect up, do some exploring
3. Back on the linux console via SSH, fill up the disk where the minecraft data is stored. The old "dd" utility can do this easily: dd if=/dev/zero of=/same/disk/with/minecraft/dummyfile.out bs=1024 count=100
4. Increase the count size, or make more dummy files, until the disk is full.
5. Now connect to minecraft and start exploring, or making changes to the chunks that have already been generated.
6. Check the server log file. You should see minecraft generating errors as it fails to write stuff to disk.

Seems like a reasonable time to crash to prevent writing incomplete chunk data to the disk.

Clavis Fly 2018-01-27T18:08:44Z

I'm sorry if this was already explained and I'm just too dense to figure it out, but is there a known fix for this error so that it will stop occurring? I already repaired my worlds with mc edit, but i see no point in repairing them if it is going to happen again.

Heege McGee 2018-01-27T18:22:41Z

You can try to repair the damage with MCedit, but the reason it happened is likely either a) your hard drive is full b) your hard drive is about to malfunction / is malfunctioning. The root cause is that minecraft wasn't able to fully write a chunk to disk; there can be many reasons why this happens.

My only hope with updating this ticket is that Mojang will make Minecraft handle IO issues in a more intelligent way, instead of adding corruption to a save that could potentially be moved to another hard drive / server once root cause is addressed.

Clavis Fly 2018-01-29T00:29:15Z

Thanks for the information, i guess I'll wait it out and hope for a bug fix.

bdm68 2018-11-29T01:04:06Z

I will assume that chunks get written in Anvil files like this:

1. Move the chunk to the first free space in the Anvil file that is large enough to hold it, or the end of the file if no such space exists.
2. Update the Anvil file header to point to the new location with the new size.

If either step fails with an I/O error, the chunk data is still in the old location and is not lost. Newly-generated chunks will be lost but these can be regenerated. The I/O exception can be handled at that point. In such circumstances, a shutdown can (and must) be performed to protect the integrity of the data. What must not happen is further I/O. This is apparently what's happening. Bad I/O handling and aggressive handling of free space in Anvil files is a bad combination and it is apparently causing misplaced chunks. It's better to shut the game down immediately, causing the player to lose a few minutes' work, than to corrupt the save file, causing them to lose a lot more. It is better to fail safely.

When the game shuts down in this way, the integrity of the save should be checked. Detecting whether this check is needed is easy. Have a flag in level.dat called "running" that is set to 1 when the game is being played and cleared to 0 when the save shuts down cleanly. If the game crashes, the running flag isn't 0 in the save and this can be used to determine whether the game exited cleanly. If the running flag is 1 on startup, an integrity check should be performed. Note that detecting this cannot be done by setting a "crashed" flag of some sort because the crash could be serious enough to stop all I/O or the O/S itself has crashed.

homie lizard 2019-09-22T12:17:05Z

they still swap...

CubeTheThird 2019-09-22T14:20:58Z

@unknown, please confirm that you have reproduced this issue in snapshot 19w34a or later, for 1.15.

homie lizard 2019-09-23T00:41:09Z

i already did actually

slicedlime 2019-09-23T07:40:49Z

Please be specific. What version did you encounter this on and in which situation? Are you sure the bug occurred on the version you are claiming and wasn't already present in the world when opening it in the snapshot? Does it also occur in a new world?

Just Maji 2019-09-27T13:20:15Z

It happened to me too. It was because blackout in my city and game probably didnt saved propertly. So just 2 chunks have switched (i hope). I just want to ask if it will occur again when i will pay attention to saving the world propertly.

Thanks for Help and sorry for my english (hope you will understand the text)

fire 1234567890 2019-10-04T12:39:20Z

1.14.4 I have the same issue the chunks are swapping!!!!!

[Mod] violine1101 2019-10-04T12:40:20Z

This issue will be fixed in the next version (1.15). If this issue is still happening to you in the 1.15 development versions, please create a new ticket with as many details as possible (in particular, game logs).

homie lizard 2019-10-11T23:02:13Z

it seems as if bugs cant be avoided at this point. in my main world in 1.14.2, i have a lot of swapped chunks, reset stats and villagers that dont restock. most of my other worlds got deleted by an error and my old worlds got deleted from a non-related computer error. so now i beat the dragon 4 times, and 2 of the 4 are unplayable.

Carl William Dupont Dyssel 2020-05-04T14:58:12Z

In my world all the chunks swapped around randomly this occurred after my launcher had a malfunction. And when I logged out and came back in the chunks had swapped around completely, I play on Minecraft 1.15.2 would like some guidance thank you

[Mod] violine1101 2020-05-04T15:28:35Z

There's a new ticket for 1.15: MC-161823