[Vanilla Bug] When traveling with a boat, player position gets stuck but the boat travel continues

[NikkyD 34]

For a happy kitty:

 

Version #: 0.79.12.427 (with recommended forge)SSP/SMP (Single/MultiPlayer): singleSuggested Name: see aboveSuggested Category: Severe if reproducable on other systemsDo you have any mods other than Forge and TFC installed?: MapWriter (happens without as well)

 

Config: no change 

Seed: -291621335819898294

 

 

I travel south by boat, suddenly the ocean chunks are no longer appearing. I am floating at the edge of the world, literally. Waiting doesnt help, game will not crash.

If i save/exit and reload, i am about 200 blocks north from where i got stuck, so my position wasnt updated, thats why i assume something got stuck.

However, if i exit the boat, i am dropping into the water about 200 block north as well. So somehow i can continue the travel but my internal player position gets stuck.

 

I can reproduce this with the same seed!

 

Create world with above seed, turn gamemode C, give yourself a boat, fly, tp to 27177 / 150 / -4140, put boat in water, sit in it, gamemode s, travel south.

Whenever i do that, after about 300 blocks i hit the end of the world. Exiting the boat teleports me back (not the boat).

 

Somehow the player position gets out of sync with the boat position (or client position, im not sure how exactly minecraft handles this)

[Kittychanley 1,002]

Player position not syncing with boat position is a vanilla bug that has been around for a very long time. This has nothing to do with TFC.

 

Edit: Here's the link to the issue on the vanilla tracker: https://bugs.mojang.com/browse/MC-2931 It has been around since Minecraft 1.4.4

[NikkyD 34]

Any known workarounds ? I wanna build a regular travel route to the equator, sorta like a summer house, i get as far as -4000, what now ?

[Kittychanley 1,002]

There are a few workarounds, but none of them are ideal. The problem is that the client thinks the boat is moving faster than the server does. To get around this you can either periodically tap W instead of holding it down to move at a slower pace, or you can periodically log out and back in while you are in the boat. The relog will reset your position to where you were actually located (usually behind where you thought you were by a hundred blocks or so). Then you can keep travelling. Both of these are frustrating because every time it updates you realized you didn't travel nearly as far as you thought you did, but that's what is causing the bug in the first place.

[NikkyD 34]

Well...

 

see i traveled about 2k of ocean to that spot, holding down W all the time. Only there i hit "the wall". I log out and back in at about -4100 and i cant ever get past -3800 or so. Log out, log back in, i am at somewhere -4100.

I could travel 2000 before and somehow at this very REPRODUCABLE position this bug hits really really hard.

[Kittychanley 1,002]

See, now that's something completely different, and has nothing to do with the fact that you are in a boat. It sounds like your computer can't handle generating the terrain that's beyond that point, so the server is lagging behind. If you were travelling by land, this would be obvious due to block lag, in that picking up the rocks and sticks on the ground likely wouldn't drop the item immediately.

 

How much memory do you have allocated to Minecraft? Are you using any arguments to help with garbage collection? It sounds like this report is a duplicate of this bug:

 

http://terrafirmacraft.com/f/topic/7404-chunk-gen-crash/

[NikkyD 34]

I have 3g allocated and F3 tells me that not even 2G are used. Besides, it doesnt crash, i can float next to the wall forever, my position is already de-sync, but something causes my player to suddenly stay behind at this very bermuda triangle.

 

I do recall that i once made a trip to the equator but it was before mapwriter so i dont know if i took exactly the same lane across the ocean.

[Kittychanley 1,002]

Does it only happen if you travel by boat? Can you reproduce it by just flying in that direction? Do you have fastcraft installed? The game does indeed hang a bit for me when I hit around -3800, but if I sit there for long enough, the chunks do eventually load and I can continue forward.

[NikkyD 34]

No fastcraft, have to check the flying approach after dinner.

 

How long did you wait there until the chunks appeared ? I waited 2 min or so, F3 showed 0 chunk updates, traveling left/right also didnt help, the Z coord seemed stuck

[Kittychanley 1,002]

I didn't think to time it, but it couldn't have been more than maybe 5 minutes. I did F3+A a few times to refresh the chunks in front of me as well, and ran the auto-map command for JourneyMap to show that the chunks were at least loaded on that screen.

[NikkyD 34]

Ok, with flying there is no problem at all.

 

So its boats at that specific area that somehow love to get out of sync for whatever reason.

 

 

Honestly, next time i'll teleport because flying in c-mode is a joke as a workaround, sadly.

[Kittychanley 1,002]

To clarify exactly what is happening here. The server is lagging when you reach that area. Because the server is lagging, it thinks that you and your boat are at a different location. Once the server stops lagging and properly catches up, it can resync the boat/player location.

 

In other words, you're only going to have the boat teleport issue while it is originally generating those chunks. Once the chunks are generated, you will be able to travel that area by boat with no issues.