Hi Mojang team,

We meet an issue when we used commands like fill.
For instance we use these commands :
/fill 9 77 317 30 77 296 minecraft:snow
/fill 9 77 317 30 77 296 minecraft:air

We can have a player that see all the area filled with snow, and for me I see only a part of the area filled with snow. So it results of an error update of the world. After some use of the commands, we can have a crash of the connection with the server.

Here is the output we get :

Completely ignored arguments: [--nativeLauncherVersion, 286]
[22:03:26] [Client thread/INFO]: Setting user: Jackobo
[22:03:26] [Client thread/INFO]: (Session ID is token:17941c07a64b4973874d8efd2b0d0d64:48a555082fa04024aa3f464db1d9e406)
[22:03:27] [Client thread/INFO]: LWJGL Version: 2.9.4
[22:03:28] [Client thread/INFO]: Reloading ResourceManager: Default
[22:03:28] [Sound Library Loader/INFO]: Starting up SoundSystem...
[22:03:28] [Thread-5/INFO]: Initializing LWJGL OpenAL
[22:03:28] [Thread-5/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[22:03:28] [Thread-5/INFO]: OpenAL initialized.
[22:03:28] [Sound Library Loader/INFO]: Sound engine started
[22:03:30] [Client thread/INFO]: Created: 512x512 textures-atlas
[22:03:34] [Client thread/INFO]: Connecting to mc.jackobo.info, 13201
[22:03:48] [Client thread/INFO]: [CHAT] 484 blocks filled
[22:03:48] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:46) [15w38b.jar:?]
at bab.as(SourceFile:920) [15w38b.jar:?]
at bab.a(SourceFile:377) [15w38b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:125) [15w38b.jar:?]
Caused by: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at io.netty.buffer.AbstractByteBuf.checkReadableBytes(AbstractByteBuf.java:1175) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.buffer.AbstractByteBuf.readByte(AbstractByteBuf.java:570) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at em.readByte(SourceFile:663) ~[15w38b.jar:?]
at aqw.a(SourceFile:87) ~[15w38b.jar:?]
at ard.a(SourceFile:908) ~[15w38b.jar:?]
at bif.a(SourceFile:522) ~[15w38b.jar:?]
at gp.a(SourceFile:68) ~[15w38b.jar:?]
at gp.a(SourceFile:11) ~[15w38b.jar:?]
at fh$1.run(SourceFile:13) ~[15w38b.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:45) ~[15w38b.jar:?]
... 3 more
[22:03:48] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:46) [15w38b.jar:?]
at bab.as(SourceFile:920) [15w38b.jar:?]
at bab.a(SourceFile:377) [15w38b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:125) [15w38b.jar:?]
Caused by: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at io.netty.buffer.AbstractByteBuf.checkReadableBytes(AbstractByteBuf.java:1175) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.buffer.AbstractByteBuf.readByte(AbstractByteBuf.java:570) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at em.readByte(SourceFile:663) ~[15w38b.jar:?]
at aqw.a(SourceFile:87) ~[15w38b.jar:?]
at ard.a(SourceFile:908) ~[15w38b.jar:?]
at bif.a(SourceFile:522) ~[15w38b.jar:?]
at gp.a(SourceFile:68) ~[15w38b.jar:?]
at gp.a(SourceFile:11) ~[15w38b.jar:?]
at fh$1.run(SourceFile:13) ~[15w38b.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:45) ~[15w38b.jar:?]
... 3 more
[22:03:49] [Client thread/INFO]: [CHAT] [DaeronRS: 484 blocks filled]
[22:03:49] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:46) [15w38b.jar:?]
at bab.as(SourceFile:920) [15w38b.jar:?]
at bab.a(SourceFile:377) [15w38b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:125) [15w38b.jar:?]
Caused by: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at io.netty.buffer.AbstractByteBuf.checkReadableBytes(AbstractByteBuf.java:1175) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.buffer.AbstractByteBuf.readByte(AbstractByteBuf.java:570) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at em.readByte(SourceFile:663) ~[15w38b.jar:?]
at aqw.a(SourceFile:87) ~[15w38b.jar:?]
at ard.a(SourceFile:908) ~[15w38b.jar:?]
at bif.a(SourceFile:522) ~[15w38b.jar:?]
at gp.a(SourceFile:68) ~[15w38b.jar:?]
at gp.a(SourceFile:11) ~[15w38b.jar:?]
at fh$1.run(SourceFile:13) ~[15w38b.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:45) ~[15w38b.jar:?]
... 3 more
[22:03:51] [Client thread/INFO]: [CHAT] 484 blocks filled
[22:03:51] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:46) [15w38b.jar:?]
at bab.as(SourceFile:920) [15w38b.jar:?]
at bab.a(SourceFile:377) [15w38b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:125) [15w38b.jar:?]
Caused by: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at io.netty.buffer.AbstractByteBuf.checkReadableBytes(AbstractByteBuf.java:1175) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.buffer.AbstractByteBuf.readByte(AbstractByteBuf.java:570) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at em.readByte(SourceFile:663) ~[15w38b.jar:?]
at aqw.a(SourceFile:87) ~[15w38b.jar:?]
at ard.a(SourceFile:908) ~[15w38b.jar:?]
at bif.a(SourceFile:522) ~[15w38b.jar:?]
at gp.a(SourceFile:68) ~[15w38b.jar:?]
at gp.a(SourceFile:11) ~[15w38b.jar:?]
at fh$1.run(SourceFile:13) ~[15w38b.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:45) ~[15w38b.jar:?]
... 3 more
[22:03:57] [Client thread/INFO]: [CHAT] [DaeronRS: 484 blocks filled]
[22:03:57] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:46) [15w38b.jar:?]
at bab.as(SourceFile:920) [15w38b.jar:?]
at bab.a(SourceFile:377) [15w38b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:125) [15w38b.jar:?]
Caused by: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at io.netty.buffer.AbstractByteBuf.checkReadableBytes(AbstractByteBuf.java:1175) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.buffer.AbstractByteBuf.readByte(AbstractByteBuf.java:570) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at em.readByte(SourceFile:663) ~[15w38b.jar:?]
at aqw.a(SourceFile:87) ~[15w38b.jar:?]
at ard.a(SourceFile:908) ~[15w38b.jar:?]
at bif.a(SourceFile:522) ~[15w38b.jar:?]
at gp.a(SourceFile:68) ~[15w38b.jar:?]
at gp.a(SourceFile:11) ~[15w38b.jar:?]
at fh$1.run(SourceFile:13) ~[15w38b.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:45) ~[15w38b.jar:?]
... 3 more
[22:04:00] [Client thread/INFO]: [CHAT] 484 blocks filled
[22:04:00] [Client thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at g.a(SourceFile:46) [15w38b.jar:?]
at bab.as(SourceFile:920) [15w38b.jar:?]
at bab.a(SourceFile:377) [15w38b.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:125) [15w38b.jar:?]
Caused by: java.lang.IndexOutOfBoundsException: readerIndex(0) + length(1) exceeds writerIndex(0): UnpooledHeapByteBuf(ridx: 0, widx: 0, cap: 35072/35072)
at io.netty.buffer.AbstractByteBuf.checkReadableBytes(AbstractByteBuf.java:1175) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at io.netty.buffer.AbstractByteBuf.readByte(AbstractByteBuf.java:570) ~[netty-all-4.0.23.Final.jar:4.0.23.Final]
at em.readByte(SourceFile:663) ~[15w38b.jar:?]
at aqw.a(SourceFile:87) ~[15w38b.jar:?]
at ard.a(SourceFile:908) ~[15w38b.jar:?]
at bif.a(SourceFile:522) ~[15w38b.jar:?]
at gp.a(SourceFile:68) ~[15w38b.jar:?]
at gp.a(SourceFile:11) ~[15w38b.jar:?]
at fh$1.run(SourceFile:13) ~[15w38b.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
at g.a(SourceFile:45) ~[15w38b.jar:?]
... 3 more
[22:04:03] [Client thread/INFO]: [CHAT] [DaeronRS: 484 blocks filled]