When ever I load a certain area of my world the attached crash happens.
If the world is started as a server only the client crashes, but the crash report should speak for itself.
Steps to reproduce:
1. Download the attached world file
2. Log into this world
3. Look down
Description: Tesselating block in world
java.lang.IndexOutOfBoundsException
at java.nio.Buffer.checkIndex(Buffer.java:538)
at java.nio.DirectByteBuffer.putFloat(DirectByteBuffer.java:887)
at bfd.b(SourceFile:414)
at bge.a(SourceFile:225)
at bgd.a(SourceFile:67)
at bht.b(SourceFile:176)
at bhp.a(SourceFile:78)
at bho.b(SourceFile:121)
at bfr.a(SourceFile:842)
Note that this crash might be environment dependent.
How the world got corrupted like this
I had the world open to LAN and when I left it Minecraft hung (MC-72943). After forcing the process to stop and restarting the crash happened when ever joining the world again.
Search disclaimer
The only unresolved issue I could find which might be related to this one is MC-81252, but it has a completely different stack trace. There is many other issues about the same/similar crashes but as they are resolved I just assume that they have different causes.
Potential Fix
The reason for the exception is that a buffer for rendering overflows.
WorldRenderer.java (in MCP)
package net.minecraft.client.renderer;
...
public class WorldRenderer {
...
private void growBuffer(int p_178983_1_) {
LogManager.getLogger().warn("Needed to grow BufferBuilder buffer: Old size " + this.bufferSize * 4 + " bytes, new size " + (this.bufferSize * 4 + p_178983_1_) + " bytes.");
this.bufferSize += p_178983_1_ / 4;
ByteBuffer var2 = GLAllocation.createDirectByteBuffer(this.bufferSize * 4);
this.rawIntBuffer.position(0);
var2.asIntBuffer().put(this.rawIntBuffer);
this.byteBuffer = var2;
this.rawIntBuffer = this.byteBuffer.asIntBuffer();
this.rawFloatBuffer = this.byteBuffer.asFloatBuffer();
}
public void setVertexState(WorldRenderer.State p_178993_1_) {
this.rawIntBuffer.clear();
// This call causes the crash. Calling growBuffer() when needed fixes the crash for me.
this.rawIntBuffer.put(p_178993_1_.func_179013_a());
this.rawBufferIndex = p_178993_1_.getRawBufferIndex();
this.vertexCount = p_178993_1_.getVertexCount();
this.vertexFormat = new VertexFormat(p_178993_1_.func_179016_d());
}
...
}
Growing the buffer might be the right fix, but it could also be that the reason why it overflows is a bug in the first place.
Linked issues
is duplicated by
Attachments
Comments
And Osx is confirmed to crash too thanks to RedstoneSpire 🙂

Confirmed.
What's a tesselating block?

"tesselating " is a verb and not a noun. Read that message as IndexOutOfBoundsException on tesselating a block in world

@@unknown MC-72943 seems to be it. Thank you for linking it 🙂
Can confirm for 15w31b. See
[media]I won't attach a crash report for every new version form now on. But I just tested it for 15w33b and 15w33c. Still happens.
Can confirm for 15w35e. I think the issue is just that a buffer needs to be grown.
Confirmed for 15w36d.
Thank you for fixing it!
I wonder whether he found the reason for the buffer overflow.
anyways now the only thing preventing Panda's mushroom cows from being happy in his farm is:
MC-50367
I am having a similar issue in 1.10.2 on a server called Arkham Network but it is not repetitive
got the same issue on 1.10.2
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Now also confirmed to crash on Windows thanks to Twitter user @Robitobi01 🙂