When I opened the world I have been working on for the past month, the world first opened up to black. Usually it loads after a while, but this time it didn't load at all. Since had cheats on anyway, I tried teleporting, then going high to kill myself, and eventually I just used the "/kill" command to sepuku my character. When I respawned, the world was back except for a giant hole where I had just been. The hole goes all the way up and down, and it won't let me enter that area. I also tried accessing the area through the top and it won't let me.
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Just forgot to add, I really have no idea how this happened. It was there one minute. I exited out to do something, came back, and it had fragged the entire area.

I think this is a duplicate of MC-2545.
Please force a crash by holding F3+c for 10 seconds and attach the crash report here.
Is the chunk error persistant?

Minecraft Crash Report ----
// My bad.
Time: 10/28/14 12:43 PM
Description: Manually triggered debug crash
java.lang.Throwable
at bsu.r(SourceFile:1563)
at bsu.as(SourceFile:877)
at bsu.a(SourceFile:314)
at net.minecraft.client.main.Main.main(SourceFile:120)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
– Head –
Stacktrace:
at cen.a(SourceFile:308)
– Affected level –
Details:
Level name: MpServer
All players: 1 total; [cio['Pnospric'/137, l='MpServer', x=251.31, y=76.17, z=-44.12]]
Chunk stats: MultiplayerChunkCache: 288, 289
Level seed: 0
Level generator: ID 04 - customized, ver 0. Features enabled: false
Level generator options:
Level spawn location: 265.00,63.00,-51.00 - World: (265,63,-51), Chunk: (at 9,3,13 in 16,-4; contains blocks 256,0,-64 to 271,255,-49), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 6124388 game time, 2234024 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: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 119 total; [aeo['Cave Spider'/0, l='MpServer', x=256.44, y=24.44, z=-60.28], acb['Rabbit'/6, l='MpServer', x=282.72, y=56.00, z=-11.28], acb['Rabbit'/7, l='MpServer', x=280.06, y=56.00, z=-14.38], acb['Rabbit'/8, l='MpServer', x=283.31, y=56.00, z=-13.31], acb['Rabbit'/9, l='MpServer', x=283.69, y=56.00, z=-15.22], acb['Rabbit'/10, l='MpServer', x=282.81, y=56.00, z=-13.28], abr['Chicken'/11, l='MpServer', x=267.78, y=56.00, z=-40.81], abr['Chicken'/12, l='MpServer', x=267.69, y=56.00, z=-40.03], abs['Cow'/13, l='MpServer', x=273.25, y=56.00, z=-38.72], abr['Chicken'/14, l='MpServer', x=267.78, y=56.88, z=-34.22], abr['Chicken'/15, l='MpServer', x=264.44, y=56.00, z=-33.66], abr['Chicken'/17, l='MpServer', x=262.47, y=56.00, z=-38.38], adw['item.item.egg'/16, l='MpServer', x=261.50, y=56.00, z=-38.56], abr['Chicken'/19, l='MpServer', x=266.97, y=56.84, z=-34.94], abr['Chicken'/18, l='MpServer', x=267.44, y=56.00, z=-35.75], adw['item.item.egg'/21, l='MpServer', x=267.88, y=56.00, z=-36.75], abr['Chicken'/20, l='MpServer', x=267.59, y=56.00, z=-40.75], adw['item.item.egg'/23, l='MpServer', x=265.84, y=56.00, z=-35.75], abr['Chicken'/22, l='MpServer', x=266.31, y=56.00, z=-35.78], abs['Cow'/25, l='MpServer', x=275.53, y=56.00, z=-35.53], abs['Cow'/24, l='MpServer', x=270.94, y=56.88, z=-34.47], abr['Chicken'/27, l='MpServer', x=262.56, y=56.00, z=-39.44], abr['Chicken'/26, l='MpServer', x=261.38, y=56.00, z=-37.41], adw['item.item.egg'/29, l='MpServer', x=262.06, y=56.00, z=-34.72], abr['Chicken'/28, l='MpServer', x=263.28, y=56.00, z=-36.22], abr['Chicken'/31, l='MpServer', x=266.73, y=56.00, z=-40.27], abr['Chicken'/30, l='MpServer', x=261.84, y=56.00, z=-39.44], abr['Chicken'/35, l='MpServer', x=266.88, y=56.88, z=-34.22], abr['Chicken'/33, l='MpServer', x=267.66, y=56.88, z=-35.06], abr['Chicken'/39, l='MpServer', x=270.59, y=56.02, z=-35.56], abr['Chicken'/36, l='MpServer', x=261.19, y=56.00, z=-39.94], abs['Cow'/37, l='MpServer', x=269.53, y=56.14, z=-35.55], abs['Cow'/42, l='MpServer', x=269.44, y=56.00, z=-39.56], abs['Cow'/40, l='MpServer', x=269.75, y=56.00, z=-36.59], adw['item.item.egg'/41, l='MpServer', x=261.72, y=56.00, z=-40.09], abr['Chicken'/46, l='MpServer', x=269.19, y=56.00, z=-34.22], aca['Pig'/47, l='MpServer', x=274.94, y=56.00, z=-24.44], abr['Chicken'/44, l='MpServer', x=265.47, y=56.00, z=-39.28], abs['Cow'/45, l='MpServer', x=271.63, y=56.00, z=-37.38], abs['Cow'/51, l='MpServer', x=269.44, y=56.88, z=-34.47], adw['item.item.egg'/775, l='MpServer', x=267.47, y=56.00, z=-40.88], aca['Pig'/50, l='MpServer', x=269.44, y=56.00, z=-20.47], adw['item.item.egg'/772, l='MpServer', x=267.88, y=56.88, z=-34.13], aca['Pig'/49, l='MpServer', x=270.84, y=56.00, z=-23.44], aca['Pig'/48, l='MpServer', x=269.47, y=56.88, z=-25.72], acl['Sheep'/55, l='MpServer', x=283.53, y=56.00, z=-34.47], abs['Cow'/54, l='MpServer', x=282.22, y=56.00, z=-38.94], acl['Sheep'/53, l='MpServer', x=282.31, y=56.00, z=-34.47], adw['item.item.egg'/769, l='MpServer', x=269.59, y=56.00, z=-36.78], acl['Sheep'/52, l='MpServer', x=283.47, y=56.00, z=-39.25], acl['Sheep'/59, l='MpServer', x=277.44, y=56.00, z=-40.56], acl['Sheep'/58, l='MpServer', x=279.84, y=56.00, z=-40.53], adw['item.item.egg'/780, l='MpServer', x=262.69, y=56.00, z=-39.66], acl['Sheep'/57, l='MpServer', x=283.53, y=56.00, z=-40.56], acl['Sheep'/56, l='MpServer', x=281.00, y=56.00, z=-40.56], adw['item.item.egg'/778, l='MpServer', x=267.72, y=56.88, z=-35.00], abs['Cow'/63, l='MpServer', x=272.72, y=56.00, z=-36.91], acl['Sheep'/62, l='MpServer', x=283.53, y=56.00, z=-37.94], acl['Sheep'/61, l='MpServer', x=283.53, y=56.00, z=-36.75], acl['Sheep'/60, l='MpServer', x=280.44, y=56.00, z=-33.84], abs['Cow'/68, l='MpServer', x=272.03, y=56.00, z=-34.50], abs['Cow'/69, l='MpServer', x=273.16, y=56.00, z=-34.47], acl['Sheep'/70, l='MpServer', x=283.53, y=55.91, z=-35.59], acl['Sheep'/71, l='MpServer', x=280.53, y=56.00, z=-32.66], acl['Sheep'/64, l='MpServer', x=278.69, y=56.00, z=-39.38], acl['Sheep'/65, l='MpServer', x=277.44, y=56.00, z=-38.19], acl['Sheep'/66, l='MpServer', x=277.44, y=56.00, z=-39.38], abs['Cow'/67, l='MpServer', x=278.75, y=56.00, z=-40.56], abs['Cow'/76, l='MpServer', x=274.28, y=56.00, z=-34.47], acb['Rabbit'/77, l='MpServer', x=275.69, y=56.00, z=-21.13], aca['Pig'/78, l='MpServer', x=279.59, y=56.00, z=-23.75], aca['Pig'/79, l='MpServer', x=283.53, y=56.88, z=-23.50], acl['Sheep'/72, l='MpServer', x=280.56, y=56.00, z=-39.25], acl['Sheep'/73, l='MpServer', x=281.09, y=56.00, z=-34.94], abs['Cow'/74, l='MpServer', x=275.50, y=56.00, z=-36.72], abs['Cow'/75, l='MpServer', x=275.53, y=56.00, z=-34.47], acb['Rabbit'/85, l='MpServer', x=278.13, y=56.00, z=-18.78], aca['Pig'/84, l='MpServer', x=280.44, y=56.00, z=-22.25], acb['Rabbit'/87, l='MpServer', x=281.59, y=56.00, z=-23.13], acb['Rabbit'/86, l='MpServer', x=278.25, y=56.00, z=-16.72], aca['Pig'/81, l='MpServer', x=277.47, y=56.00, z=-25.31], aca['Pig'/80, l='MpServer', x=277.53, y=57.00, z=-26.81], aca['Pig'/83, l='MpServer', x=280.75, y=56.00, z=-24.16], acb['Rabbit'/82, l='MpServer', x=277.28, y=56.00, z=-17.72], aca['Pig'/93, l='MpServer', x=280.53, y=56.00, z=-27.97], aca['Pig'/92, l='MpServer', x=279.53, y=56.00, z=-26.69], aca['Pig'/95, l='MpServer', x=281.91, y=56.00, z=-25.44], acb['Rabbit'/94, l='MpServer', x=277.28, y=56.00, z=-16.84], aca['Pig'/89, l='MpServer', x=280.59, y=56.00, z=-25.41], acb['Rabbit'/88, l='MpServer', x=283.16, y=56.88, z=-22.41], acb['Rabbit'/91, l='MpServer', x=278.09, y=56.00, z=-19.72], acb['Rabbit'/90, l='MpServer', x=277.28, y=56.00, z=-19.72], aca['Pig'/102, l='MpServer', x=274.69, y=56.00, z=-20.47], acb['Rabbit'/103, l='MpServer', x=283.81, y=56.00, z=-16.72], acb['Rabbit'/100, l='MpServer', x=283.69, y=56.00, z=-26.91], aca['Pig'/101, l='MpServer', x=283.53, y=56.00, z=-21.47], acb['Rabbit'/98, l='MpServer', x=277.28, y=57.00, z=-27.72], aca['Pig'/99, l='MpServer', x=278.25, y=56.00, z=-21.59], aca['Pig'/96, l='MpServer', x=282.56, y=56.00, z=-26.81], aca['Pig'/97, l='MpServer', x=282.34, y=56.00, z=-24.13], acb['Rabbit'/110, l='MpServer', x=281.91, y=56.00, z=-13.31], acb['Rabbit'/111, l='MpServer', x=277.28, y=56.00, z=-18.91], acb['Rabbit'/108, l='MpServer', x=281.00, y=56.00, z=-14.41], acb['Rabbit'/109, l='MpServer', x=282.75, y=56.00, z=-14.25], acb['Rabbit'/106, l='MpServer', x=277.78, y=56.00, z=-14.38], acb['Rabbit'/107, l='MpServer', x=278.09, y=56.00, z=-13.41], acb['Rabbit'/104, l='MpServer', x=278.63, y=56.00, z=-25.31], acb['Rabbit'/105, l='MpServer', x=281.78, y=56.00, z=-14.28], abx['Mooshroom'/119, l='MpServer', x=301.84, y=56.00, z=-10.41], abx['Mooshroom'/118, l='MpServer', x=302.75, y=56.00, z=-11.53], abt['Horse'/117, l='MpServer', x=299.84, y=56.00, z=-15.44], abt['Horse'/116, l='MpServer', x=299.34, y=56.00, z=-17.13], abt['Horse'/115, l='MpServer', x=302.91, y=56.00, z=-17.72], acb['Rabbit'/114, l='MpServer', x=282.22, y=56.00, z=-19.16], acb['Rabbit'/113, l='MpServer', x=283.69, y=56.00, z=-14.22], acb['Rabbit'/112, l='MpServer', x=277.38, y=56.00, z=-5.31], aeg['entity.MinecartRideable.name'/121, l='MpServer', x=326.56, y=41.00, z=16.88], abt['Horse'/120, l='MpServer', x=299.31, y=56.00, z=-13.72], cio['Pnospric'/137, l='MpServer', x=251.31, y=76.17, z=-44.12]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at cen.a(SourceFile:308)
at bsu.b(SourceFile:2252)
at bsu.a(SourceFile:323)
at net.minecraft.client.main.Main.main(SourceFile:120)
– System Details –
Details:
Minecraft Version: 1.8
Operating System: Windows 8.1 (x86) version 6.3
Java Version: 1.7.0_67, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 109733872 bytes (104 MB) / 343998464 bytes (328 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 9, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.8
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics GL version 4.0.0 - Build 10.18.10.3308, Intel
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: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)

Nope, the problem still persists.

I'm just going to delete this world. Looks like other people have the same problem and it's not able to be fixed. I hope this gets fixed in next update though so it won't happen again.

Sara: it's gonna be fixed in 1.8.1.

If it won't let you in from the top, that means the blocks are actually still there. No data has been lost, just a little bit corrupted. Keep the world. If 1.8.1 fixes this, there's a 99% chance that it will just reappear like nothing happened, however a chest or something may have disappeared, as corrupted tile entities (blocks able to store items, etc) are often the cause of things like this.