Ghost Players in Multiplayer / Item Duplication
Player lagged out (timeout due to bad connection), as a result the server didn't kick the player out of the game. Player rejoined and ended up spawning inside the old player position which then turned into a ghost. The real player can move around normally, but the ghost simply stands in place, but is able to take damage as if it were a normal player. The damage doesn't affect the player the ghost came from. After about a minute the ghost will vanish and the server will say the player left the game, but /list shows the real player and other players like normal.
DUPLICATION:
In our occurrence, we were getting the "Diamonds to You!" achievement, one player threw the diamonds to me (8 of them), on my screen I threw them back. Then I lagged out, rejoined, and I still had the 8 diamonds, however the player I returned them to retrieved them as well, and had tried to send 1 back to me again (since I threw all out at once rather than simply using the Drop Item key), which may have been collected by the ghost player. So we ended up with 15 diamonds through the lag, and these diamonds were able to be moved around and crafted with without any disappearing (as if it were a client error).
Environment
Server:
Windows 7 Home Premium x86
3GB RAM
Intel Celeron C900 (single core not too good)
Linked Issues
is duplicated by57
MC-37543Invisibility and invincibility glitch in multiplayerDuplicateMC-38339Item DuplicationDuplicateMC-39100Inventory duplication death exploitDuplicateMC-39149Disconnect via Internet outage bugDuplicateMC-39846Duplication of all inventory items **WORKS ON MULTI-PLAYER VANILLA**DuplicateMC-40375Duplication Bug MultiplayerDuplicateMC-40894Double Client Login Duplication of itemsDuplicateMC-41403Strange BugDuplicateMC-42910Item Dupe with lag on multiplayer servers 1.7.4DuplicateMC-43446Duplication RAM CrashDuplicateMC-43884[SMP]Dublication after log in from another locationDuplicateMC-442012 accounts on at the same timeDuplicateMC-49864Two players of me on Multiplayer server.DuplicateMC-55401I see myself loging out DuplicateMC-55444Player clones when logging in and out of MC (servers) fast.DuplicateMC-55706Player remains on servers after disconnect/timeout.DuplicateMC-55965Item duplication after network failureDuplicateMC-56008Player joining game twice: Item + Horse (any ridable entity) Duplication + Confusing Statistics & AchievmentsDuplicateMC-56263After disconnecting from realms a duplicate of the player remains.DuplicateMC-60417Players duplicate when they lost conectionDuplicateMC-61439Same player 2 times in gameDuplicateMC-61738Duplication with server laggDuplicateMC-6359314w30c LAN world issueDuplicateMC-64131Clone of player is created if ReadTimeOutDuplicateMC-641522 of the same playerDuplicateMC-66611Players are cloned on crash.DuplicateMC-67297Player DuplicationDuplicateMC-6882914w34c Duplication BugDuplicateMC-68907Player avatar entity gets duplicated on crash, can potentially dupe items.DuplicateMC-68951Multiple player entities, when trying to reconnect get a ReadTimeoutException caused by the duplicated player entitiesDuplicateMC-69279Losing Internet Connection dupes players.DuplicateMC-69378Serious client/server desyncDuplicateMC-70067server message that a player has left but they are still in gameDuplicateMC-70406Item Duplication GlitchDuplicateMC-70963Player leaving GlitchDuplicateMC-70996Player DuplicationDuplicateMC-71063Crash and DuplicateDuplicateMC-71227duplicate people in the same serverDuplicateMC-71261Disconnected and there are multiple "me's" around where I dced.DuplicateMC-71295Clones in multplayer after TimeoutDuplicateMC-71404Minecraft server spawns "Duplicate" playersDuplicateMC-71420Disconnected and multiple user instances afterward.DuplicateMC-71526Users are kicked from multiplayer server and are seen as a duplicate player when reloggingDuplicateMC-72162Disconnected players appear to log in multiple times concurrentlyDuplicateMC-72240Persistant death state upon login.DuplicateMC-72382Died while going through nether portal and spawned copies of my characterDuplicateMC-72512Ghost player then server lagDuplicateMC-728482 players in multiplayerDuplicateMC-72951DuplicationDuplicateMC-73164Server "Forgets" Player is logged inDuplicateMC-73486Multiplayer-double click- Cause invisible players and unexpected log off messageDuplicateMC-75199Duplication IssueDuplicateMC-77692Gold DuplicationDuplicateMC-784692 of the same personDuplicateMC-87151Duplicate player on LAN World DuplicateMC-89800My friend and I were playing MC on 15w40b, and in the log it said gumgum87 joined the game twice. (gumgum87 is my friend). And it actually created another "NPC" of him, showing an alex skin floating up in creative mode. Please help!DuplicateMC-93308Realms player clone glitchDuplicate
Created Issue:
Ghost Players in Multiplayer / Item Duplication
Player lagged out (timeout due to bad connection), as a result the server didn't kick the player out of the game. Player rejoined and ended up spawning inside the old player position which then turned into a ghost. The real player can move around normally, but the ghost simply stands in place, but is able to take damage as if it were a normal player. The damage doesn't affect the player the ghost came from. After about a minute the ghost will vanish and the server will say the player left the game, but /list shows the real player and other players like normal.
DUPLICATION:
In our occurrence, we were getting the "Diamonds to You!" achievement, one player threw the diamonds to me (8 of them), on my screen I threw them back. Then I lagged out, rejoined, and I still had the 8 diamonds, however the player I returned them to retrieved them as well, and had tried to send 1 back to me again (since I threw all out at once rather than simply using the Drop Item key), which may have been collected by the ghost player. So we ended up with 15 diamonds through the lag, and these diamonds were able to be moved around and crafted with without any disappearing (as if it were a client error).Environment
Server:
Windows 7 Home Premium x86
3GB RAM
Intel Celeron C900 (single core not too good)
Attachments2
- Unresolved
- Open
- Minecraft - Public
- Unconfirmed
- Survival
- dupe duplication ghost lag multiplayer player server survival timeout
- 1.7.2
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![[Mojang] Nathan Adams](../../../data/assets/gravatar/dinnerbone.png){kind=small}
[Mojang] Nathan Adamsis duplicated by
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Problem has worsened with the 1.8 official release and the game is absolutely unplayable. Seemed to be introduced in the more recent 1.8 snapshots and it seems to be luck if the game plays as it should. I'll enter the server, am able to move around, but cannot interact with the environment (however I CAN place blocks). If I destroy blocks, they'll disappear as intended, but the block will not make its way to my inventory. Either leaving the server or getting kicked (via IO.exception) will cause a ghost of my character to remain on the server (even though I am no longer actually connected to the server). This ghost can occasionally still be vulnerable to attack and the server still sees the ghost as an actual person on the server. This can lead to my character being killed (for example) if I'm outside and night-time falls, allowing mobs to spawn and immediately attack me. If I attempt to enter the server again, I can see my ghost (if it survived), otherwise I'll enter to a death screen (however since the game is still screwy, I can't pick up my dropped items and they'll likely despawn). There are also times where I can log back into the server and kill my own ghost, causing item duplication (it is possible for other characters, who are not experiencing this issue to collect these duplicate items). I've been able to get upwards of three ghosts of myself on the server at the same time (haven't actually tried to go beyond that).
The server host, as well as myself, have tried going forwards and backwards in snapshots, updating Java, allocating more RAM, etc. and the problem has not had a consistent solution. We have no reason to think it's an issue with the internet connection as we've been able to host servers flawlessly in previous versions (with far more resource-consuming builds/worlds).
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As Galaxy_2Alex said, this is a serious duplication glitch. Many people outside of this bug tracker have already experienced this issue (http://redd.it/2govls for example). Bukkit and Spigot have/had this patched, so Mojang should be able to look up their fix in the Bukkit code. Note that the DMCA doesn't prevent Mojang from looking at it, just the public.
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![[Mod] CubeTheThird](../../../data/assets/gravatar/cubethethird.jpeg){kind=small}
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![[Bot] Arisa](../../../data/assets/gravatar/mustek2.png){kind=small}
Duplicate of Unresolved
MC-37586
If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
Duplicate of (private) MC-37586
Duplicate of private ticket MC-37586.
Would be a regression of MC-37586, please provide more informatio over there and request a reopen.
Duplicate of MC-37586
Duplicate of MC-37586
Unfixable. MC-37586
Duplicate of MC-37586
Unfixable. MC-37586
Duplicate of MC-37586
Dupe of MC-37586
Duplicate of MC-37586
Dupe of MC-37586
Based on the comment above, it could be related to MC-37586 which is when the server thinks a player hasn't left when they actually have, causing ghost players.
Did read the whole thing, still duplicate of MC-37586.
There are multiple causes of player duplication, loss of connection is one, you're describing another.
The cause ist most probably a modded server, the result is MC-37586
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.
Dupe of MC-37586
Dupe of MC-37586
Dupe of MC-37586
Dupe of MC-37586
Could be MC-37586
Duplicate of MC-37586
This bug was probably the cause of this other bug: MC-37586 and is now fixed I think.
Dupe of MC-37586
I saw someone glich moving, after I killed him and he got back this is what I see: him glitch dieing, while he himself is standing in the background
video:
https://youtu.be/be_rQ_YAynk
Note, this is not the same as MC-37586 since the "ghost" player was an actuall player, and when killed created the real dubble, and the effected player never left the game
THIS IS DIFFERENT FROM MC-37586. I was playing on a LAN world with my cousin and I noticed there was a clone of my player, it had the same username etc., it also showed up in the player list. What makes this different from MC-37586 is that whenever I said something in the chat the duplicate player would say it also. Thank you in advance for reading this.
Its still MC-37586. That something was said in the chat doesn't matter.
when logging x times in and out of my server, minecraft seems to freeze, there's no crash report
A friend of mine has the same issue and get's this in the client output
[17:49:29] [Client thread/INFO]: Connecting to ---- AL lib: (EE) alc_cleanup: 1 device not closed
Relates to MC-37586 since the time when MC freezes the other players will see a ghost player until your minecraft is closed. Also since there seems to apear lag just in front of it.
server output:
[17:58:37] [Server thread/INFO]: FVbico[------] logged in with ent
ity id 391 at (100.22113955822324, 69.90746060924664, -3.635686317876777)
[17:58:37] [Server thread/INFO]: FVbico joined the game
[17:58:57] [Server thread/WARN]: Can't keep up! Did the system time change, or i
s the server overloaded? Running 2053ms behind, skipping 41 tick(s)
[17:58:57] [Server thread/INFO]: FVbico lost connection: TranslatableComponent{k
ey='disconnect.genericReason', args=[Internal Exception: java.io.IOException: De
software op uw hostcomputer heeft een verbinding verbroken], siblings=[], style
=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obf
uscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[17:58:57] [Server thread/INFO]: FVbico left the game
Dupe of MC-37586
I can confirm this.
It happens very often when I reconnect, I'm even able to kill my clone and pick up his items.
This can be easily exploited to duplicate anything present in the affected player's inventory, especially once you figure out how a very reliable way to reproduce it.
Can confirm the ghosting (forced 24 hourly disconnect by ISP), but not the duplication.
To duplicate:
1) Player disconnects their internet, and leaves the game their side.
2) Player connects their internet again and logs on asap.
3) Ghost will be made if the player is fast enough to log on before the server times the ghost out.
4) Kill the ghost, it will drop the items you had when you left.
I made a video showing how easy it is to exploit this bug, I was a bit afraid of sharing it because of the nature of the issue, but since Odd Man basically described how to reproduce it, here it is: http://youtu.be/glwceU6CY2Q
As you can see, in my case I don't even have to lose connection to make it happen. A couple of minutes online seem to be enough to trigger it and a normal reconnection does the trick, so to speak.
I never noticed this problem during the first days after the update. It became noticeable only about a week later, and now it happens 99.9% of the times I click on disconnect.
Also, I seem to be the only player affected by it on server I play on, which makes me think the problem is related to some network configurations.Edit: Other than item duplication, this bug can cause the opposite effect because anything contained in the ghost player's inventory gets lost when the server kicks him out.
Confirmed on Multiplayer server 1.7.2 with 3 players.
Easier way to do it with only 1 person in multi which ive seen done unf many times
1. Load up 2 clients and get them onto the Multiplayer Screen using the same account
2. Join Client A to a server and drop what ya want to be copied/Duplicated and exit
3. join Client B quickly to the same server and pickup dropped items and you now supposedly have dble what you started with.
I can confirm this in Windows 8.1 x64 in Vanilla 1.7.2 SMP. This can be replicated with the following steps:
1.) Unplug network adapter by any means. Keep it unplugged until the server kicks you with an io.netty error.
2.) Immediately replug adapter and reconnect to server.
3.) Once logged in, kill the ghost copy of you any way you want.
4.) Pick up his drops.
There is a video here demonstrating the bug in action.
Hmmm. I have seemed to notice that on a Bukkit Server I was a ghost, I had the Invicibility 1 effect. Then Invicibility 2 hides me completely....strange?
Is this still a concern in the current Minecraft version 1.7.9 / Launcher version 1.3.11 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
In reply to Synchunk: Yes it is still a major issue for me on a 1.7.9 realms server, and almost everytime I log out and in there is a clone there that I could theoretically kill and get a duplicate of my items. It looks as if this bug is not getting the attention it should, as it is a very easy way to duplicate all of your items.
Reopened
MC-68829Unfixable. Grum's comment from
MC-66611:The duplication part of this bug (which is still possible in recent snapshots according to
MC-68829) should be fixable, even if 'ghost players' aren't.Why the hell is this "Won't Fix"?
On my 1.7.10 server i'm never getting this, and on the snapshots i'm getting this all the time.
There is no way that this is client side only, because everybody is getting this error on my server.
This must be re-opened, it is a game destroying bug. I understand how timeouts work, but you should not be able to log in to a server to which you are currently logged in. Note also that if you do login while a ghost of you exists, the server becomes unusable (100% CPU usage), and cannot be cleanly restarted (it hangs on shutdown). Finally, I'm not convinced this is solely a timeout issue as sometime the server can fail to notice a disconnect for minutes at a time.
This can be fixed, in bukkit it doesn't happen so obviously it is possible to do. It's like ok, the player Smokey95dog is still on the server, don't allow another Smokey95dog to be online. This bug needs attention, you can duplicate anything very easily, as long as your internet is kinda bad.
This bug also allows griefers to destroy the world. They don't appear in the server log, so they're not suspected. It caused our admin to change the map twice, ban at least 30 people and finally shut the server down. Please fix this Mojang. It also never happened to me in 1.7, only in the snapshots.
I can't reproduce this in 1.8-pre2.
Here's what I've tried.
This should work, as my player does seem to stay logged in for a while when I disconnect A's internet. However, as soon as I join from B, I see my ghost self leave instantly. There's never any opportunity to abuse the bug.
Can anyone who currently has this bug detail exactly how it can be reproduced?
It's sometimes hard to reproduce, you probably have a better chance if the server is located somewhere far away from where you live. Try this: have both players online on the server, and disconnect the internet of one of them. Immeadiatly start killing the one who you just disconnected the internet from. When the other player logs in again, they should still be in the same position without losing any of their gear, while you just got a dupe of theirs.
For me it happens on my realms server a lot, so it could be easier in one of those, but obviously you can't use a 1.8 snapshot if you try that.
If the other method does not work, try this:
(If possible lower internet speeds) Using one player, log in and out of a server as fast as you can, until when you log in there is a clone of you. Kill the clone as fast as you can.
Hope this can help you reproduce the bug, sometimes it is easier for some people than others. (Pretty sure it's based on how good/fast your internet is and the latency between the server and you)
My internet isn't great, if you have a good connection it's harder to reproduce. Basically, use a laggy Wifi connection.
Still happens with 1.8-pre3
Can confirm, 1.8 pre3, with multiple players. http://i.imgur.com/pdWZtMQ.jpg
Unfortunately I have to say this still present in 1.8 and now it's 10 times worse. I'm trying to record some footage to show how messed up it is.
Dinnerbone, please, until an actual fix is found, revert any change related to this bug. Online experience is completly broken for me now.
Edit:
Video is up.
This is my breakdown of what happens, I hope it makes at least a bit of sense and can help pinpoint the real cause of this bug. What I'm about to describe is solely based on observations so I might be wrong on different parts of it, also I'm aware my terminology is a bit off and my English is bad. Apologizes in advance for that.
1. The client fails to communicate its disconnection to the server, or the server fails to elaborate it properly.
This causes the player character to be left in the game controlled by nobody because no connection is happening.
It seems to happen only after a few minutes of online time on the server; no particular action triggers it.
Maybe it's caused by something wrong with my network, not sure, all I know is that it seems to affect only specific players and in my case it went from an occasional issue to an every day problem by itself.
2. For reasons beyond me, the server allows multiple instances of the same player (with the same UUID) to exist inside the game at the same time.
When this happens, it gives to the freshly joined player his personal data (inventory items and such) loaded from the latest save as expected but it doesn't kick out the old instance and save his profile before doing that. Easy to see this is where item duplication and all the other related mishaps happen.
This so far is what used to happen in 1.7. Now in 1.8 new odd behaviours got added to the list.
3. Previously the "ghost" player was timed out after 20 seconds. Not always the case anymore.
4. Sometimes after killing your own copy and reconnecting, you are spawned in as the player who just got killed instead of the killer (who supposedly is the latest instance of you playing on the server).
5. If you kill your copy and relog, it's possible to see it play the death animation over again. I don't think other players on the server can see this happen.
6. With enough abusing of this bug you can get three or even more instances of the same player on the server.
7. When this bug happens, the following messages show up in the console every 2 seconds:
23:46:24 CONSOLE: 2014 11:46:23 EM io.netty.channel.AbstractChannelHandlerContext invokeExceptionCaught
23:46:24 CONSOLE: exception was thrown by a user handler's exceptionCaught() method while handling the following exception:
23:46:24 CONSOLE: existing connection was forcibly closed by the remote host
This also causes the server to freeze if you try to /stop it while this is happening.
On the bright side, the exploit described by Warren Liddell appears to be fixed.
This is a serious duplication glitch, can be abused by Hackers etc.
Reopened until official confirmation on this ticket that it cannot be fixed.
can confirm with other report. i created a report then found this one.
Youtube video featuring the bug: https://www.youtube.com/watch?v=TB2qe5fEIII&feature=youtu.be
link to report i made: https://bugs.mojang.com/browse/MC-70963
This bug has become more prominent in 1.8. Console gets spammed with this:
And occasionally this error will show up:
i am seeing ghosting as well, I wonder if this glitch is what is allowing players not on the white list to join occasionally?
I got this error, no Exception shown in console.
Was a white-listed vanilla server.
There was considerable tick lag at the time, the player was surrounded by farm animals so may relate to a high entity count.
The player killed their ghost, but it was able to float in midair without being kicked.
Presumably it was due to the alive player satisfying all the checks for being online. I assume if they logged out the ghost player may have timed out.
Killing the ghosted player results in the items dropping with the live player able to pick them up put them in chests etc.
When the live player logs out, and back in after ghost being killed, live player then takes the position of the respawned player.
I've experienced this bug and I can kill myself(PVP is enabled). Mobs do not attack. The only way I've been able to recreate the bug is to switch to wifi and unplug my lan cable while in game. That only worked to recreate the bug once.
I can confirm this too. My friend hosting a server got his internet bugged at that moment, and when i rejoined I was able to see my avatar, kill it and it "left the game" after some time. Funny.
It's a popular meme btw. "The Two Bajs Bug".
BdoubleO's Minecrack episode where he made up the song about a ghosting player: http://youtu.be/ilKBVAPfN1c
Remix of the Two Bajs song: http://youtu.be/s-WZioyra50
Minecon 2013 where they were asked to sing it: http://youtu.be/epCqViZOqc0
@Tokes: that's a different and (very likely) unrelated, client-side, visual bug. What we're discussing here is actual player duplication happening server-side.
This bug seems to be a number of bugs as I have been able to fix some but I still keep getting issues. It should be mentioned that I am running a completely vanilla server with the GUI turned off for about two years now on Win 7.
1) Things I have done to fix some of these issues, First off I deleted all player .dat files (There are issues with the UUID from older accounts). This means I had to have everyone on the server remove all their armor, all their inventory and their Ender chest. Once they did that I had them message me. I deleted their UUID.dat file(world/playerdata). UUID look up tool http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-tools/1265839-minecraft-php-uuid-finder Then once they rejoined Minecarft would create them a new data file.
2)I then turned off player-idle-timeout=0 in server.properties, you can also just double this. This helps if there is lag not to have someone kicked/ helps stop the Ghosting.
3) I decreased the server view distance down to 9(you should go no lower then this or it effects mob spawning https://bugs.mojang.com/browse/MC-2536)
4)The last and final thing I have done is to delete the Mineshaft.dat file (http://www.reddit.com/r/admincraft/comments/2h8nkb/can_someone_give_me_a_hand_with_problems_since/) it is located in world/data file. Deleting this file should not cause any issues as it is basically not in use right now. However it is so big it appears to be causing read/write issues (my old file was 2138 KB and the new file went down to 7 KB) you may have to delete this periodically.
Possibly fixed for next pre: https://twitter.com/Dinnerbone/status/529041733028679681
...well, okay. Marking it as such.
Still an issue in 1.8.1-pre4. [screams internally]
When I log off I still have to wait 20 seconds for my player to actually disconnect from the server.
What has changed now is that if I try to reconnect while my ghost copy (for lack of a better term) is online, I doom the server into an endless loop of error spam. The following messages are displayed multiple times in a second:
(From McMyAdmin's web interface console. I can't seem to find this error in the log files)
and my ghost copy is never timed out and nobody is able to login until the server restarts.
Meanwhile, on the client end, I get this error:
I'm currently waiting for some friends to help me find out what happens ingame during all of this and also test if it's still possible to duplicate items.Edit for clarification: the server error itself is nothing new. The difference is that now I'm not able to log back in and my player is never timed out.
Edit 2: I got around testing again with another player online. We did not manage to duplicate any item.
Imo this bug is fixed in pre4
The item duplication bug has been fixed as far as I can tell. It seems to have been replaced by "a render the server unusable" bug. As Qlimax Mito documents, the sequence of events that used to lead to a killable ghost player now prevents anyone from logging in and the server from shutting down cleanly. This is NOT GOOD.
So [Mod]s should we open a new bug for the new (equally bad) behavior, or will you re-open this one?
Thanks in advance.
Pongo
Still an issue in 1.8.1-pre5.
Do you mean it still takes a long time to log in or do you mean you were actually able to get two players in a game at the same time?
No we mean that if you try and log in before the old you has timed out, then the server is rendered unusable, neither the player nor anyone else can log in to the server. Also, the server can not then be shut down cleanly.
Exactly what Pongo Sapiens said. Thank you for putting my thoughts into words.
ah yes, in that case. Confirmed for 1.8.1-pre5
Still an issue in 1.8.1.
Confirmed in 1.8.1pre5 and just caught a user doing it. He was forcing his client down and reopening, Logging back in and picking up emeralds he was throwing down in spawn.
Error Log: http://pastebin.com/VW9QGcSg
server ip: play.MinecraftGods.com
After several errors as seen in the pastebin, i checked the users inventory and seen he has managed to gain 59 emeralds.
I was able to duplicate this myself by logging my client into 2 separate machines and forcing one down, then joining with the other machine. I did this on LAN connection with the server, seems easier to do if outside the Network where the server is hosted.
Still an issue in 1.8.7.
Whenever I disconnect from a server my character stays logged in for the next 20 seconds, until he's timed out by the server.
Confirmed for 15w40b
I haven't really tested this in the latest 1.9 snapshots but I can confirm this is happening in 1.8.8. Me personally cannot reproduce this bug but my friend is able to do so on command. He just disconnects and log in again and everytime it works.
When this is happening he's able to kill his own ghost entity/player and thereby duplicate the items, truly game-breaking in my opinion.
Was this fixed by the fix of
MC-92476?Or is for example the method described by dacoconuttman still working?
Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.