World generation freezes worker threads, unable to save or move/teleport from broken area [Bug]

Gredys commented 2 years ago

What happened?

While moving thrue the end with Better End mod installed I managed to get invisible chunks. Didn't managed to get thru them further and decided to move back, where terrain were still loaded.

But to my supriprise it also bugged and was invisible.

After checking if server is alive (looking at mobs and writing something in chat) I found that it wasn't. There wasn't any crash, no any error. Just a constant load of 50% CPU (on Ryzen 9 3950X).

Any attempts to teleport out of end or quit a game (save) is leading to stuck on Saving world screen.

The game itself is not frozen and working like a normal, just not passing anywhere from Saving world screen.

Cos there is no any crash or log that can definetly tell what is happening - I decided to go and view threads and stacks.

What I found inside of them:

Almost all worker threads are doing something with BlockFixer from BetterEnd mod.
One of worker threads are having huge stack while including usage of BlockFixer again (which I think is not ok and problem right here, thread 50 in log)

P.S. Deleting End dimension and generating it again is not helping. Additional information:
- Seed: -5819485594570939900
- Position: x 1838, z 296, y 91
- Screenshot of problem location: https://i.imgur.com/5FdijT6.jpeg

BetterEnd

1.1.1

BCLib

1.4.7

Fabric API

0.58.0

Fabric Loader

0.14.9

Minecraft

1.18.2

Relevant log output

Thread dump is not fitting here. Uploaded it here - https://pastebin.com/vu7m45we

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quiqueck commented 2 years ago

Tanks for reporting. Unfortunately this is a know bug. But so far I could not reliably reproduce it to find out what is triggering the Deadlock...

Gredys commented 2 years ago

Tanks for reporting. Unfortunately this is a know bug. But so far I could not reliably reproduce it to find out what is triggering the Deadlock...

I tried many times to clear the saves from End dimension and it is 100% times starting to freeze at same location. I can pack all mods with partial save and send you. It could help to locate this deadlock problem, at least tell which block is doing that and dig from that point up the stack.

P.S. Only would if any java debug ide would work with running game without a problem - I would help to locate the problem.

alerikaisattera commented 1 year ago

A little extra information on this bug:

It exists in 1.19.2
It does not seem to be tied to a specific location
Returning to Overworld using certain items from Gobber mod succeeds and the Overworld is totally normal, but quitting the game still hangs on saving screen and forcible termination is required
Going back to The End after returning to Overworld makes the entire End affected by this bug

quiqueck / BetterEnd