Massive Client / Server desynchronisation
I tried to use a minecart, right clicked the minecart and pressed the launch button of the railway.
At first glance nothing happened except the minecart has disappeared.
A nearby door opened without anything on the pressure plate.
Attempts to close the door failed, the door reopened immediately.
Breaking the pressure plate didn't help.
While trying do destroy the malfunctioning door suddenly the chunks around me dissolved, eventually the chunk under my feet and I fell into the void, I quitted the game immediately.
After re-entering I found me driving in the minecart quite far away from the starting point.
When driving back to the starting point, everything was like nothing happened: The pressure plate was in-place, the door was shut.
I assume that the server did all right and drove the minecart with me in a correct manner, but the client desynched and did it's own game. Eventually the chunks were unloading and I fell into the void.
The server log has no entries around that time. No Client crash report, no logfile. No screenshot. Issue not reproducible.
Environment
Java 7U9-64, Windows 7 64bit, 3 Ghz Quad core 6GB, AMD Radeon 6700, Vanilla server & Client (Mod: MCPatcher) running on same machine
Linked Issues
is duplicated by24
MC-11650Inception Boat-Sends you back where you originally startedDuplicateMC-14972Creates a Chunk error and other side effectsDuplicateMC-15252Can't pick up dropped items, place blocks, or push buttonsDuplicateMC-15659Server (lag?) BugDuplicateMC-15687Player on screen moves, player to others is frozen,can't break blocks away from frozen character.DuplicateMC-15750Boat Teleport BugDuplicateMC-15882Strange Boats BugDuplicateMC-17108missing water?? in floating on the bedrock?? dafuk?DuplicateMC-17440Boats can turn you into a ghost entityDuplicateMC-33277Boat causes world to endDuplicateMC-37261Arrows offset while in boatDuplicateMC-40576Strange boat behaviorDuplicateMC-44251Breaking blocks while being teleported will not update the gameDuplicateMC-77542Arrows can't be fired properly from boatsDuplicateMC-89111Player doesn't burn in lavaDuplicateMC-89112Hovering silverfishDuplicateMC-89113Can't break gravel DuplicateMC-1089Minecraft Character Stops, Everything Else Continues [Multiplayer]DuplicateMC-1122Character Location bugDuplicateMC-2656Occasionally the server will lose track of the client, and the client will continue doing things, but only client side.DuplicateMC-3048Items DisappearingDuplicateMC-3252Missing items/ lagDuplicateMC-3431Position lagDuplicateMC-3932Multiplayer Location / Standing stillDuplicate
Created Issue:
Massive Client / Server desynchronisation
I tried to use a minecart, right clicked the minecart and pressed the launch button of the railway.
At first glance nothing happened except the minecart has disappeared.
A nearby door opened without anything on the pressure plate.
Attempts to close the door failed, the door reopened immediately.
Breaking the pressure plate didn't help.
While trying do destroy the malfunctioning door suddenly the chunks around me dissolved, eventually the chunk under my feet and I fell into the void, I quitted the game immediately.
After re-entering I found me driving in the minecart quite far away from the starting point.I assume that the server did all right and drove the minecart with me in a correct manner, but the client desynched and did it's own game. Eventually the chunks were unloading and I fell into the void.
The server log has no entries around that time. No Client crash report, no logfile. No screenshot.
Environment
Java 7U9-64, Windows 7 64bit, 3 Ghz Quad core 6GB, AMD Radeon 6700, Vanilla server & Client (Mod: MCPatcher) running on same machine
I tried to use a minecart, right clicked the minecart and pressed the launch button of the railway.
At first glance nothing happened except the minecart has disappeared.
A nearby door opened without anything on the pressure plate.
Attempts to close the door failed, the door reopened immediately.
Breaking the pressure plate didn't help.
While trying do destroy the malfunctioning door suddenly the chunks around me dissolved, eventually the chunk under my feet and I fell into the void, I quitted the game immediately.
After re-entering I found me driving in the minecart quite far away from the starting point.
When driving back to the starting point, everything was like nothing happened: The pressure plate was in-place, the door was shut.I assume that the server did all right and drove the minecart with me in a correct manner, but the client desynched and did it's own game. Eventually the chunks were unloading and I fell into the void.
The server log has no entries around that time. No Client crash report, no logfile. No screenshot. Issue not reproducible.
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I have recently noticed that, this glitch or something, and a combination of lag, has started happening in singleplayer, for me. Although, earlier it was only on servers, and occasionally LAN servers.
Edit: This seems to nly be from interent problems, i'll delete this now.
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![[Mod] Ezekiel (ezfe)](../../../data/assets/gravatar/ezekielelin.jpeg){kind=small}
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No, Kumasasa. In MC-811 the minecart did not disappeared, was just a problem in the visualization created by the client side.
I think that this issue is related to MC-811.
With the information you have provided, I suspect MisterSanderson is right, that this is a duplicate of MC-811 and will resolve this as such. If you can provide information to the contrary, please do and we can change the status of the ticket.
The majority of bugs are minor bugs. A major bug would be something like MineCraft crashing on everyone's system on a new release regardless of setup.
Duplicate of MC-811 Please use the search function to see if your bug has already been submitted. Currently over 25% of tickets are being closed as duplicate.
Seems to be related to MC-811.
I wasn't playing online, I was in a single player world.
There should be NO desync offline as you aren't connected to a server. And because MC-811 is server-related, it is a different issue.
The internal server is by far the worst addition to Minecraft. It was just fine without it.
If this is a duplicate of MC-811, then I have 2 things to add:
1) There should not be any sort of Desync in an offline game, but the Internal server ruined that completely
2) Boats are now unreliable, as placing them anywhere causes this to happen.
![[Mod] Torabi](../../../data/assets/gravatar/torabi.png){kind=small}
I had a similar thing happen twice while driving in a minecart. Without any interaction, I suddenly stood on the tracks and the minecart drove away at full speed. A while later, the chunks around me began to unload. When I reconnected, I was suffocating somewhere in a wall.
Same thing happened to me, minecart just went away and i were standing still, suddenly chunks started unloading and i logged out. Reconnecting fixed the position, a hundred blocks a way.Other players on the server saw me driving away so i suppose it's a client side bug.
I was in my boat and it broken without any reason and without dropping anything. I tried to put torches in the ground and can't. When I reopened the world I fallen from the boat.
Apparently this is the same as my glitch , which whenever I reload anything I recently placed will be gone , and everything I recently destroyed will be back , but mine was on creative mode.
A mod told me that it was the same.
I find it most when I'm walking through a tight hallway or through a doorway and it snaps me back a few blocks, thinking I hit a wall while my client didn't. I keep walking, and suddenly I can't interact with anything. Typing in the chat proves that it isn't server lag, and disconnecting and reconnecting will place me back where I was stuck. I call this position lag because of the difference in positions. It happens most often with partial blocks like stairs, chests, and doors.
I've had the same problem Eric, although for me it happens out in the open (i.e. fields etc.)
Just to be sure, is this the Problem your talking about: (see below link)
http://www.minecraftsurvivalgames.com/threads/1-3-game-ending-killing-glitch-bug.16114/
Short Description:
"All of a sudden everyone sees my player frozen but i can move but cant do anything and if i drop things they come out of my frozen player and my frozen player can attack from there but u will basically always die."
I also get the 'knockback thing'. The F3 menu and running helps prevent it though, temporarily.
It effects versions 1.3.2, and all of 1.4.
You can also see the effect in one of Etho's latest episodes.
I can confirm this will happen on a stone silver vanilla client.
Jonathan, may I ask, what do you mean by "stone silver" vanilla client?
A diamond pickaxe with Efficiency V desyncs gravel/dirt/sand, blocks disappear clientside, but the server won't let me go past the space they've occupied. Refreshing the blocks reverts them back into existence.
Minecraft 1.4.6
Oracle Java 1.7.0_10
After turns cart with me runs visually on parralel line, sometimes it rides above tracks.. after reaching certain speed strange things may happen, like cart stops while I keep moving, or after stop cart sinks into block underneath and I get stuck. Relogging results in showing expected state: cart and me are in place.
Minecraft 1.3.6 -1.4.7
Oracle Java 1.7.0_10
I thought this may be related, (i.e. its about a mod to do with this bug):
"Well, basically the way freecam works is you simply stop sending move/look updates to the server. On the client you're still moving about, but the server never gets told that so it thinks you're just standing there. So all you need to do is take the whole if/elseif block that sends out those packets, and put it inside your own if statement checking if freecam is on."
http://www.minecraftforum.net/topic/1169102-smp-free-camera-mod-help/
A really good way of reproducing:
Yes, excellent reproduction Mod Tails, i've tested it, and it work every time. Although I had some trouble geting the boat on the sign.
Edit:
Although it only seems to work for those with the glitch.
Here's something I also thought was related:
http://dev.bukkit.org/server-mods/nocheatplus/tickets/320-erm-some-weird-freecam-bug/
Still in 1.6.2 with Tails' Soul-Sand-Ring-Boat procedure.
I've spent some time recently trying to figure out the cause of server client glitches like that. While I can't explain the scenario in the report, I think I do know what's going on with boats and why they are so bugged. There's lots of issues with boats and client/server synchronization in general, so I'll try sticking to the causes of the soul sand setup glitches, which by the way also works with just a single solid block on which you place the boat (make sure there's no adjacent blocks).
First of all, you should know there's an evil flag in the boat class. When set to false, the client takes over the control of the boat on his side. The flag is more than likely meant to be false whenever the player is inside the boat. In MCP it's called "field_70279_a". Think of it like "not ridden by local player" or "give control to server".
1) Boats glitching into the ground
The cause of this is that when the client accepts server updates (i.e. flag is true), it skips collision detection entirely, and just warps the boat to the received location. This would be fine if the positions sent by the server were always correct, but they generally are not due to optimization and bugs. One consequence of this is that when you place a boat on a full block, it will be slightly inside the ground. You don't really notice that because the client doesn't even apply gravity to the boat, at least until you get in and make the client take control of the boat, at which point the collision of the boat with the ground block goes unnoticed (because it's already inside the block), but only by the client.
2) Server/Client split
As pointed out above, once the player enters the boat, and the flag is set to false, the client entirely ignores updates from the server for the boat (without having checked that, I assume when riding something the player's position is synchronized via the vehicle, not the player itself), only the movement commands are now being synchronized, so you still move server-side.
However, there's some indication in the code that the player ridden boat is still supposed to accept position updates, but only if the discrepancy is more than 1 block. On the other hand, they could have changed it in hindsight because the movement might have ended up being jerky if the latency was high. So I guess this is either an unintended error, or the (possible unintentional) consequence of another bugfix.
3) Ghost boats
Once you leave the desynced boat, you'll notice that you (the player) returns to the correct server-side position while the boat is still off. That seems to be because of an error (in NetClientHandler) which causes the flag to stay false, even after the player leaves the boat. So any boat you enter and leave will essentially become a ghost, because the client starts ignoring updates from the server and does his own thing. Apart from restarting the game / reloading the entity, this false state is only corrected when another entity enters the boat.
I also made a mod to fix related issues: https://github.com/taurose/Unglitch . At the moment, it only fixes 1) mentioned here. I might do some more tests to figure out a clean way to fix the other issues as well though.
Is this still a concern in the latest Minecraft version 13w42b? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Still observed in 1.7.2 SMP boats. Big problem for our ocean spawn server.
I fell into the void yesterday riding a boat in v1.7.4 (client downloaded 4-dec-13, and server set up ~14-dec-13. As a matter of client-server protocol, the client should always know if it has failed to get a "chunk" and refuse to act upon NUL data. It should never drop a player into the void because "the world disappears", and such a drop should never then be accepted by the server.
Same issue in 1.7.4 SSP. This issue makes travel by boat impossible. I can sail for perhaps 3-4 chunks before new chunks on the horizon stop loading. If I travel to this world edge and step out of the boat, I am returned to within 1-2 chunks of where I started, and my boat is another chunk or two out to sea. Evidently the game doesn't recognize I am moving, and ceases to update my location or load new chunks.
For emphasis: this is game-breaking, as I can never leave an island, or explore another continent.
I've never had this issue, I boat across oceans on my server all the time without issues (1.7.4)
Boat desync still in 1.7.4, nearly 18 months of seeing this and its still not possible to use boats.
What do you need to know to fix this?
Maybe the reason it's not fixed is because th issue isn't as wide-spread as you think. Again, see my comment above yours. Not everyone is having this issue at any scale.
Is this still a concern in the latest Minecraft version 14w30c? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Partially fixed in 14w31a, Tails ring sign procedure no longer works but there are still some other ways to do this bug
I'm just going to say "boats" and reopen this.
the boats were fixed in the 1.9 snapshots, does it still happen with anything else?