Game Freezes when trying to save world

Cannot see a crash.
How long did you wait ?
Customized worlds may take some minutes until being saved (chunks are still generated and saved at the same time)

I waited for 10 minutes, my computer constantly reminding me that the program has become unresponsive.

Please do the following:

• Recreate the situation by leaving the game

• Navigate to .minecraft/saves/<WORLDNAME>/region/ and observe by spamming F5 if the files are changing the access date and the file size is increasing

I can confirm this happening to me sometimes, even on newly created and untouched superflat worlds, which should have almost nothing to save.

So far this only seems to happen to me when flying in creative. Specifically when I press ESC while moving and press Save and Quit while the character is still gliding.

Edit: Which is also to say as long as I always make sure my feet are on the ground in my local LAN game it doesn't freeze on quit.

Happens in multiplayer Direct connect too.
The save file size didn't change. From the task manager, Ram usage is static, harddrive usage is zero, and very occasional CPU use.

Turns out my previous comment had nothing to do with anything. I've had this crop up more then a few times now in a customized generation map opened to LAN. It is corruption to the map. Once it crops up the issue will continue to occur with that map about once every 4-5 exits. I rolled back a map to a backup before the issue occurred. Spent about 20 minutes launching, opening to lan, and exiting to make sure it was a good map. Then I began retracing my steps one change at a time and relaunching several times after each change. While it doesn't occur every time the one step that thus far has always preceded the corruption was changing/altering the command on a command block with a SuccessCount greater than 0. If I narrow it down any further or find out its something else entirely I'll be back.

Edit: it might be important to note that in this scenario before altering the commands the command blocks in question were cloned from another chunk after being executed once(thus setting the success count).

This happens to me as well. Most noticeably in a customised world when playing multiplayer on the local network. I've let the game screen sit over night before, and it made no difference – the game was still hung and the only way to quit was to use the task manager to kill the process.

I'm also on WIndows 8.1 (64-bit), but I'm using Java build 1.8.0_20-b26 (64-bit).

Happens on 1.8.1, too:
Thread dump says (see MineCraft-Thread-Dump.txt):

"Client thread" #1 prio=5 os_prio=0 tid=0x0000000002573800 nid=0x26a4 waiting on condition [0x0000000000e1e000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

• parking to wait for <0x00000000c11f5628> (a com.google.common.util.concurrent.ListenableFutureTask)
  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
  at java.util.concurrent.FutureTask.awaitDone(FutureTask.java:429)
  at java.util.concurrent.FutureTask.get(FutureTask.java:191)
  at com.google.common.util.concurrent.Uninterruptibles.getUninterruptibly(Uninterruptibles.java:135)
  at com.google.common.util.concurrent.Futures.getUnchecked(Futures.java:1421)
  at cyk.v(SourceFile:323)
  at bss.a(SourceFile:1949)
  at bss.a(SourceFile:1937)
  at bwx.a(SourceFile:46)
  at bxe.a(SourceFile:342)
  at bxe.k(SourceFile:405)
  at bxe.p(SourceFile:382)
  at bss.r(SourceFile:1480)
  at bss.at(SourceFile:880)
  at bss.a(SourceFile:317)
  at net.minecraft.client.main.Main.main(SourceFile:124)

I have this problem too...
I found that my world was corrupt so I created a new one after playing on it for about half an hour it happened again! Please fix Jeb 😞

@@unknown:

So far this only seems to happen to me when flying in creative. Specifically when I press ESC while moving and press Save and Quit while the character is still gliding.

Edit: Which is also to say as long as I always make sure my feet are on the ground in my local LAN game it doesn't freeze on quit.

I can continuously reproduce that in a superflat world with Open To Lan. I think that it has to deal with new chunks being loaded and not yet generated. The reason why you need to be moving in creative is to start loading new chunks, it seems. (Obviously, in a more intensive custom world, gamemode 1 wouldn't be needed because you can just walk a chunk and the new area takes a while to load).

If I'm standing still (even if flying), there isn't any problem. Again, this is on a generic superflat world – Seed manually set to 0, and it's the default grass at layer 4 one. (Also, Game Mode 1)

I cannot reproduce this in an AMPLIFIED world, however. Odd, because I can find unloaded chunks.

I'll investigate further later.

@@unknown:

Customized worlds may take some minutes until being saved (chunks are still generated and saved at the same time)

Are you sure about this? 100% sure? Because if they weren't getting generated and saved at the same time, the game would hang forever like it is.

Also, what's the relationship between this ticket and MC-72943? Are they duplicates? Does Minecraft actually make it to the saving chunks screen in this one? (the other one explicitly states it doesn't, but this one I can't tell for sure).

@@unknown: I meant it may take some time until all the generated chunks are flushed from memory to disk. Maybe the process of serializing the chunks takes a lot of more time than generating them.

In any case, reproduced in 1.8.7.

I have similar issue. I would like to add also that it actually not freezing, it quitting very slowly and it depends on chunk distance.
At 16 quitting takes ~4 seconds, at 24 - 5 min.
It reproduces to me on linux debian 8 64bit & windows 8.1 64bit on the same machine (lenovo t420). Both are running oracle java re 8u45 64bit.
I'm not 100% sure, but I believe there is something to do with Intel HD 3000.
The issue is also reproducible when trying to disconnect from the server.

I cannot reproduce it on my second machine (hp dv-4045: radeon 5650)

I have the same problem as well. I have 8 GB of memory, which gives 1 GB of memory for the game, which is lots. The game used ~210 MB out of 660 MB allocated for the game just before I saved and quit to the title, so it's unlikely to be a memory problem.

It still exists with MC 1.8.8, when I submit my log report, please read it, as it looks like it's a bug.

I have Windows 10, the newest operating system from Microsoft. However, in Java, it says that I have Windows 8.1. Hopefully, they update Java for Windows 10.

This is duplicated by MC-78892.

This is my version of the crash
File is: mc_freeze_02_10_2015.txt

I have one more thing to say, I can only reproduce this when the chunks are loading and when I am in LAN mode, so this is probably a chunk loading bug.

I am much more interested in this line:

12:48:59 - pool-2-thread-3/ERROR: Signature is missing from textures payload

This might have caused the crash on my log here and the log on MC-78892.
If you have time, you can check that log entry and determine the cause of this weird freezing and hanging of Minecraft.

It seems that in the 1.9 server also freezes during auto-saving ...

Yes, auto-save freeze game. Video here: https://www.youtube.com/watch?v=eb34vzWPveg
World save

Ghm... Autosave freeze server, but when autosave is off, /save-all don't freeze server

Reproduced this today in modded 1.8.9. Normally I know you don't care about modded, but I did manage to use WhatIsHang to get some info: https://gist.github.com/Pokechu22/f58001b188e1062d97b0adc6e4f6a550. I don't know how useful this is, but I think it may be at least somewhat helpful. (And yes, my modded install is really wonky - blame old mod management scripts of mine).

Reproduced in 1.10, but I did have optifine installed. This time I ran jstack; here's the result: https://gist.github.com/Pokechu22/4db37a3a4e432bfedeffa3da8f9a4b21. Note that optifine did mess with some of the classes in that stacktrace (you can tell because of the non-obfuscated source file), which is unfortunate, but this should hopefully give some information that may be moderately useful.

Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w43a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time. If you are the owner/reporter of this ticket, you can modify the affected version(s) yourself.

Duplicate of MC-72943 (it's been specified that this only happens when open to lan is used).

Resolving as duplicate of MC-72943 since the original game output log of this ticket mentions a LAN game:

[CHAT] Local game hosted on port 56041