[MC-90683] "Received unknown passenger" - Entities with differing render distances as passengers outputs error

Note: Not only reproducible it with an ender crystal as the host, but with a simple minecart that is ridden by an entity, thus this error message can also occur in Vanilla Survival. According to @unknown this also happens in Survival with boats.

To reproduce, summon an ender crystal that has a passenger with a smaller render distance.

/summon end_crystal ~ ~1 ~ {Passengers:[{id:"item",Item:{id:"minecraft:stone",Count:1b}}]}

/summon end_crystal ~ ~1 ~ {Passengers:[{id:"pig"}]}

When moving out of render distance of the item or pig, while remaining within rendering distance of the ender crystal, the output log will periodically spam the "Received unknown passenger" error.

No errors occur when the host and passengers are swapped. I could also not reproduce it by having an item riding a pig. I'm unsure of the render distances for other entities.

15w45a

[11:29:58] [Client thread/WARN]: Received unknown passenger for wp['entity.EnderCrystal.name'/143755, l='MpServer', x=718,56, y=57,00, z=-1889,38]
[11:30:03] [Client thread/WARN]: Received unknown passenger for wp['entity.EnderCrystal.name'/143755, l='MpServer', x=718,56, y=57,00, z=-1889,38]
[11:30:08] [Client thread/WARN]: Received unknown passenger for wp['entity.EnderCrystal.name'/143755, l='MpServer', x=718,56, y=57,00, z=-1889,38]
[11:30:13] [Client thread/WARN]: Received unknown passenger for wp['entity.EnderCrystal.name'/143755, l='MpServer', x=718,56, y=57,00, z=-1889,38]
[11:30:18] [Client thread/WARN]: Received unknown passenger for wp['entity.EnderCrystal.name'/143755, l='MpServer', x=718,56, y=57,00, z=-1889,38]
[11:30:23] [Client thread/WARN]: Received unknown passenger for wp['entity.EnderCrystal.name'/143755, l='MpServer', x=718,56, y=57,00, z=-1889,38]
[11:30:28] [Client thread/WARN]: Received unknown passenger for wp['entity.EnderCrystal.name'/143755, l='MpServer', x=718,56, y=57,00, z=-1889,38]

Code analysis by @unknown can be found in this comment.

Related issues

is duplicated by

MC-261307 Single Player "Received passengers for unknown entity"

MC-276049 "Received passengers for unknown entity" spam in the nether

Attachments

crash-2016-02-02_15.18.22-client.txt

crash-2016-02-09_16.35.01-client.txt

Comments

migrated 2015-10-15T13:54:24Z

[media][media][media][media][media][media][media][media][media][media][media][media][media][media]

migrated 2015-10-15T14:15:03Z

Confirmed, see attached screenshot of my game output.

migrated 2015-11-12T19:35:34Z

Confirmed for 15w46a.

migrated 2015-11-24T07:30:24Z

confirmed 15w47c
survival multi player on hosted server
windows 10 pro
java 1.8.0_66
log is absolutely flooded

with chickens in game spawned

tons of entries in the log appearing all throughout playing session
[code]
16:38:13] [Client thread/WARN]: Received unknown passenger for vt['Chicken'/47893, l='MpServer', x=9.50, y=36.00, z=115.50]
[16:38:18] [Client thread/WARN]: Received unknown passenger for vt['Chicken'/47893, l='MpServer', x=9.50, y=36.00, z=115.50]
[16:38:23] [Client thread/WARN]: Received unknown passenger for vt['Chicken'/47893, l='MpServer', x=9.50, y=36.00, z=115.50]
[16:38:28] [Client thread/WARN]: Received unknown passenger for vt['Chicken'/47893, l='MpServer', x=9.50, y=36.00, z=115.50]
[16:38:33] [Client thread/WARN]: Received unknown passenger for vt['Chicken'/47893, l='MpServer', x=9.50, y=36.00, z=115.50]
[16:38:38] [Client thread/WARN]: Received unknown passenger for vt['Chicken'/47893, l='MpServer', x=9.50, y=36.00, z=115.50]
[16:38:43] [Client thread/WARN]: Received unknown passenger for vt['Chicken'/47893, l='MpServer', x=9.50, y=36.00, z=115.50]
[16:38:48] [Client thread/WARN]: Received unknown passenger for vt['Chicken'/47893, l='MpServer', x=9.50, y=36.00, z=115.50]
[16:38:53] [Client thread/WARN]: Received unknown passenger for vt['Chicken'/47893, l='MpServer', x=9.50, y=36.00, z=115.50]
/code

Skylinerw 2015-12-09T16:01:39Z

Confirmed for 15w50a.

migrated 2016-02-02T20:20:53Z

Still an issue in 16w04a:
[15:15:19] [Client thread/WARN]: Received unknown passenger for vw['Chicken'/49464, l='MpServer', x=292.50, y=17.00, z=140.50]

See manually-triggered crashdump crash-2016-02-02_15.18.22-client.txt

migrated 2016-02-02T20:42:16Z

@unknown Could you please provide the summon command you used?
I tested

/summon EnderCrystal ~ ~1 ~ {Passengers:[{id:"Chicken",NoAI:1}]}

with no issues.

migrated 2016-02-02T22:57:22Z

Meri Diana - No command used, this was a natural spawn.

migrated 2016-02-02T23:05:43Z

Ooooooh weird Ö.ö
Thanks for the info!

@ mods: Should this ticket be reopened then or is it a different kind of problem of another already-existing bugpost?
Not sure if someone of you reads this, going to make a post in the Mojira-Reddit and ask for help }=)

migrated 2016-02-09T04:28:09Z

@unknown I tried to reproduce it in 16w05b but couldn't.
I tested with chicken spawned by (the food item) chicken eggs as well as chicken spawn eggs, I also bred both, and I also went into a natural world with naturally spawned chicken.
And neither in the baby nor adult form it returned with that unknown passenger message inside the client output, no matter how the chicken was created.

Could you please check with your setup if it still happens, and if so, share how to reproduce it?

Thank you, Meri

migrated 2016-02-09T04:41:20Z

Just opened my testworld, and I also did receive that output again, again with EnderCrystals...
That's weird, I tested in a previous snapshot (can't remember which), and it didn't happen with EnderCrystals anymore...
Screenshot attached.
Game output:

[05:35:35] [Client thread/WARN]: Received unknown passenger for wq['entity.EnderCrystal.name'/56, l='MpServer', x=9,50, y=64,00, z=78,50]
[05:35:35] [Client thread/WARN]: Received unknown passenger for wq['entity.EnderCrystal.name'/58, l='MpServer', x=5,59, y=67,00, z=78,44]
[05:35:35] [Client thread/WARN]: Received unknown passenger for wq['entity.EnderCrystal.name'/61, l='MpServer', x=1,50, y=65,50, z=78,50]
[05:35:35] [Client thread/WARN]: Received passengers for unknown entity

SunCat 2016-02-09T04:43:15Z

@unknown What about a zombie on a chicken? 'Cos in the error an entity doesn't know, what passenger it has.

migrated 2016-02-09T05:12:01Z

@unknown Well from how I understood it they were natural spawns, as in regular chicken (not remaining chicken from baby zombies riding them) - but good point, maybe I misunderstood it, I'll just stack them together and test those after I got rid of their rider }=)
Thanks for the suggestion!

migrated 2016-02-09T05:22:03Z

I summoned around 10 Babyzombie-Chickenrider with:

/summon Chicken ~ ~1 ~ {Passengers:[{id:"Zombie",IsVillager:0,IsBaby:1}]}

Neither with the zombies nor without them I got any game output with an unknown passenger...
I don't know whether or not it needs to be a natural spawn?

Waiting for @unknown to reply about reproducing that output or if it's fixed now in 16w05b }=)

migrated 2016-02-09T21:29:18Z

It was happening to me in standard survival as natural spawns. I will post confirmation if/when it happens again.

EDIT: confirmed. [16:33:08] [Client thread/WARN]: Received unknown passenger for vu['Chicken'/19174, l='MpServer', x=-1572.50, y=7.00, z=-8002.50]

After teleporting to these coordinates (I was in the nether) I found a chicken with an invisible baby pigman riding it (see 2016-02-09_16.33.47.png). When the chicken ran under a low roof, the baby pigman took suffocation damage.

I triggered a manual crash, see crash-2016-02-09_16.35.01-client.txt

Since this was due to an invisible chicken passenger, I'm not sure if this is more appropriate for this issue or the invisible chicken jockey MC-91388. I will post this report there as well, apologies if it doesn't belong here.

migrated 2016-02-10T05:54:52Z

@unknown Ah I see, thanks for getting back quickly! - So it's apparently regular rider-chicken after all.
Just wondering why my EnderCrystal problem came back..
Will do some testing the next days.

migrated 2016-02-17T17:29:04Z

The baby pigman/zombie on a chicken version of this problem is still an issue in 1.9 pre1

migrated 2016-02-18T19:06:31Z

The baby pigman/zombie on a chicken version of this problem seems to have gone away in 1.9 Pre2, possibly related to the NoAI Skeleton fix?

migrated 2016-03-24T20:44:47Z

Still problem, as of Minecraft 1.9

Armor stand as the entity.

[17:26:19] [Client thread/WARN]: Received unknown passenger for xq['Armour Stand'/40302, l='MpServer', x=-1279.78, y=45.87, z=-1168.34]
[17:26:19] [Client thread/WARN]: Received unknown passenger for xq['Armour Stand'/40376, l='MpServer', x=-1279.82, y=45.81, z=-1168.59]
[17:26:19] [Client thread/WARN]: Received unknown passenger for xq['Armour Stand'/40388, l='MpServer', x=-1279.50, y=45.78, z=-1168.34]
[17:26:19] [Client thread/WARN]: Received unknown passenger for xq['Armour Stand'/40392, l='MpServer', x=-1279.78, y=45.78, z=-1168.34]
[17:26:19] [Client thread/WARN]: Received unknown passenger for xq['Armour Stand'/40398, l='MpServer', x=-1279.78, y=45.87, z=-1168.34]
[17:26:19] [Client thread/WARN]: Received unknown passenger for xq['Armour Stand'/40492, l='MpServer', x=-1279.22, y=46.88, z=-1168.41]
[17:26:19] [Client thread/WARN]: Received unknown passenger for xq['Armour Stand'/40496, l='MpServer', x=-1279.03, y=46.41, z=-1168.41]
[17:26:19] [Client thread/WARN]: Received unknown passenger for xq['Armour Stand'/40500, l='MpServer', x=-1279.03, y=46.66, z=-1168.41]
[17:26:19] [Client thread/WARN]: Received unknown passenger for xq['Armour Stand'/40504, l='MpServer', x=-1279.47, y=46.88, z=-1168.41]

marcono1234 2016-03-24T21:44:15Z

Which entities are riding the ArmorStand?

migrated 2016-04-09T16:18:03Z

Sometimes the converse can happen, so that the entity is unknown, but for passenger, it is generic, simply saying passenger:
[Client thread/WARN]: Received passengers for unknown entity
Game Output:

[10:40:05] [Client thread/INFO]: Setting user: Foltrox
[10:40:08] [Client thread/INFO]: LWJGL Version: 2.9.4
[10:40:09] [Client thread/INFO]: Reloading ResourceManager: Default
[10:40:10] [Sound Library Loader/INFO]: Starting up SoundSystem...
[10:40:10] [Thread-5/INFO]: Initializing LWJGL OpenAL
[10:40:10] [Thread-5/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[10:40:10] [Thread-5/INFO]: OpenAL initialized.
[10:40:11] [Sound Library Loader/INFO]: Sound engine started
[10:40:13] [Client thread/INFO]: Created: 1024x512 textures-atlas
[10:40:22] [Server thread/INFO]: Starting integrated minecraft server version 16w14a
[10:40:22] [Server thread/INFO]: Generating keypair
[10:40:24] [Server thread/INFO]: Preparing start region for level 0
[10:40:25] [Server thread/INFO]: Preparing spawn area: 9%
[10:40:26] [Server thread/INFO]: Preparing spawn area: 93%
[10:40:26] [Server thread/INFO]: Changing view distance to 4, from 10
[10:40:27] [Server thread/INFO]: Foltrox[local:E:b41bdd7e] logged in with entity id 26 at (1168.3399061864304, 31.831704146961, 84.51719962121594)
[10:40:27] [Server thread/INFO]: Foltrox joined the game
[10:40:28] [Server thread/INFO]: Saving and pausing game...
[10:40:28] [Server thread/INFO]: Saving chunks for level 'Rails'/Overworld
[10:40:29] [Server thread/INFO]: Saving chunks for level 'Rails'/Nether
[10:40:29] [Server thread/INFO]: Saving chunks for level 'Rails'/The End
[10:40:32] [Client thread/INFO]: [CHAT] [Debug]: Hitboxes: shown
[10:40:35] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer' took aprox 107.747806 ms
[10:40:35] [Client thread/WARN]: Something's taking too long! 'root' took aprox 145.070888 ms
[10:40:41] [Client thread/WARN]: Something's taking too long! 'root.tick.textures' took aprox 101.182725 ms
[10:40:41] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 112.493982 ms
[10:40:41] [Client thread/WARN]: Something's taking too long! 'root' took aprox 136.802793 ms
[10:40:52] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 121.806609 ms
[10:40:52] [Client thread/WARN]: Something's taking too long! 'root' took aprox 162.887572 ms
[10:40:54] [Client thread/WARN]: Something's taking too long! 'root' took aprox 118.351563 ms
[10:40:55] [Client thread/WARN]: Something's taking too long! 'root' took aprox 143.149393 ms
[10:41:00] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 181.613138 ms
[10:41:00] [Client thread/WARN]: Something's taking too long! 'root' took aprox 182.04972 ms
[10:41:10] [Client thread/WARN]: Something's taking too long! 'root.tick.animateTick' took aprox 202.296677 ms
[10:41:10] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 210.532476 ms
[10:41:10] [Client thread/WARN]: Something's taking too long! 'root' took aprox 222.80505 ms
[10:41:13] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer' took aprox 106.4145 ms
[10:41:13] [Client thread/WARN]: Something's taking too long! 'root' took aprox 107.514127 ms
[10:41:18] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 190.092496 ms
[10:41:18] [Client thread/WARN]: Something's taking too long! 'root' took aprox 238.774331 ms
[10:41:26] [Client thread/WARN]: Something's taking too long! 'root' took aprox 103.911273 ms
[10:41:32] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 186.364632 ms
[10:41:32] [Client thread/WARN]: Something's taking too long! 'root' took aprox 188.694974 ms
[10:41:33] [Client thread/WARN]: Something's taking too long! 'root' took aprox 122.62316 ms
[10:42:30] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 162.091159 ms
[10:42:30] [Client thread/WARN]: Something's taking too long! 'root' took aprox 206.436804 ms
[11:13:45] [Client thread/WARN]: Something's taking too long! 'root' took aprox 102.426359 ms
[11:14:37] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level.terrain_setup.update' took aprox 173.800622 ms
[11:14:37] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level.terrain_setup' took aprox 174.422629 ms
[11:14:37] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level' took aprox 180.967573 ms
[11:14:37] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer' took aprox 186.856312 ms
[11:14:37] [Client thread/WARN]: Something's taking too long! 'root' took aprox 196.433395 ms
[11:14:58] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 190.132392 ms
[11:14:58] [Client thread/WARN]: Something's taking too long! 'root' took aprox 190.869909 ms
[11:14:58] [Client thread/WARN]: Something's taking too long! 'root' took aprox 107.23181 ms
[11:15:15] [Client thread/WARN]: Received passengers for unknown entity
[11:18:52] [Client thread/WARN]: Received passengers for unknown entity
[11:19:30] [Client thread/WARN]: Received passengers for unknown entity
[11:19:43] [Client thread/WARN]: Received passengers for unknown entity
[11:20:12] [Client thread/WARN]: Received passengers for unknown entity
[11:20:55] [Client thread/WARN]: Received passengers for unknown entity
[11:21:26] [Client thread/WARN]: Received passengers for unknown entity
[11:22:00] [Client thread/WARN]: Received passengers for unknown entity
[11:22:13] [Client thread/WARN]: Received passengers for unknown entity
[11:22:37] [Client thread/WARN]: Received passengers for unknown entity
[11:24:05] [Client thread/WARN]: Received passengers for unknown entity
[11:24:58] [Client thread/WARN]: Received passengers for unknown entity
[11:26:10] [Client thread/WARN]: Received passengers for unknown entity
[11:26:18] [Client thread/WARN]: Received passengers for unknown entity
[11:30:02] [Client thread/WARN]: Received passengers for unknown entity
[11:32:25] [Client thread/WARN]: Received passengers for unknown entity
[11:32:34] [Client thread/WARN]: Received passengers for unknown entity
[11:32:45] [Client thread/WARN]: Received passengers for unknown entity
[11:34:00] [Client thread/WARN]: Received passengers for unknown entity
[11:35:46] [Client thread/WARN]: Received passengers for unknown entity
[11:36:01] [Server thread/INFO]: Saving and pausing game...
[11:36:01] [Server thread/INFO]: Saving chunks for level 'Rails'/Overworld
[11:36:01] [Server thread/INFO]: Saving chunks for level 'Rails'/Nether
[11:36:01] [Server thread/INFO]: Saving chunks for level 'Rails'/The End
[11:36:02] [Client thread/WARN]: Something's taking too long! 'root.tick.textures' took aprox 529.901364 ms
[11:36:02] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 530.523751 ms
[11:36:02] [Server thread/INFO]: Stopping server
[11:36:02] [Server thread/INFO]: Saving players
[11:36:02] [Server thread/INFO]: Saving worlds
[11:36:02] [Server thread/INFO]: Saving chunks for level 'Rails'/Overworld
[11:36:02] [Client thread/WARN]: Something's taking too long! 'root' took aprox 581.669296 ms
[11:36:02] [Server thread/INFO]: Saving chunks for level 'Rails'/Nether
[11:36:02] [Server thread/INFO]: Saving chunks for level 'Rails'/The End
[11:37:20] [Server thread/INFO]: Starting integrated minecraft server version 16w14a
[11:37:20] [Server thread/INFO]: Generating keypair
[11:37:20] [Server thread/WARN]: Unable to find spawn biome
[11:37:20] [Server thread/INFO]: Preparing start region for level 0
[11:37:21] [Server thread/INFO]: Preparing spawn area: 54%
[11:37:22] [Server thread/INFO]: Changing view distance to 4, from 10
[11:37:22] [Server thread/INFO]: Foltrox[local:E:73bb34b4] logged in with entity id 4446 at (16.5, 4.0, 2.5)
[11:37:22] [Server thread/INFO]: Foltrox joined the game
[11:37:23] [Server thread/INFO]: Saving and pausing game...
[11:37:23] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Overworld
[11:37:23] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Nether
[11:37:23] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/The End
[11:37:31] [Server thread/INFO]: [Foltrox: Set own game mode to Creative Mode]
[11:37:31] [Client thread/INFO]: [CHAT] Your game mode has been updated to Creative Mode
[11:37:34] [Server thread/INFO]: Foltrox has just earned the achievement [Taking Inventory]
[11:37:34] [Client thread/INFO]: [CHAT] Foltrox has just earned the achievement [Taking Inventory]
[11:37:46] [Server thread/INFO]: [Foltrox: Game rule spawnRadius has been updated to 0]
[11:37:46] [Client thread/INFO]: [CHAT] Game rule spawnRadius has been updated to 0
[11:38:00] [Server thread/INFO]: [Foltrox: Game rule doMobSpawning has been updated to false]
[11:38:00] [Client thread/INFO]: [CHAT] Game rule doMobSpawning has been updated to false
[11:56:54] [Server thread/INFO]: Saving and pausing game...
[11:56:54] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Overworld
[11:56:54] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Nether
[11:56:54] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/The End
[11:56:54] [Server thread/INFO]: Stopping server
[11:56:54] [Server thread/INFO]: Saving players
[11:56:54] [Server thread/INFO]: Saving worlds
[11:56:54] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Overworld
[11:56:54] [Client thread/WARN]: Something's taking too long! 'root.tick.textures' took aprox 489.577677 ms
[11:56:54] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 490.174227 ms
[11:56:54] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Nether
[11:56:54] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/The End
[11:56:54] [Client thread/WARN]: Something's taking too long! 'root' took aprox 499.070029 ms
[11:56:57] [Server thread/INFO]: Starting integrated minecraft server version 16w14a
[11:56:57] [Server thread/INFO]: Generating keypair
[11:56:58] [Server thread/INFO]: Preparing start region for level 0
[11:56:59] [Server thread/INFO]: Foltrox[local:E:0f63f394] logged in with entity id 4550 at (122.38827188280021, 11.236501740807652, 119.22694819523265)
[11:56:59] [Server thread/INFO]: Foltrox joined the game
[11:57:00] [Server thread/INFO]: Changing view distance to 4, from 10
[11:57:15] [Server thread/INFO]: Saving and pausing game...
[11:57:15] [Server thread/INFO]: Saving chunks for level 'Rails'/Overworld
[11:57:15] [Server thread/INFO]: Saving chunks for level 'Rails'/Nether
[11:57:15] [Server thread/INFO]: Saving chunks for level 'Rails'/The End
[11:57:16] [Server thread/INFO]: Stopping server
[11:57:16] [Server thread/INFO]: Saving players
[11:57:16] [Server thread/INFO]: Saving worlds
[11:57:16] [Server thread/INFO]: Saving chunks for level 'Rails'/Overworld
[11:57:16] [Server thread/INFO]: Saving chunks for level 'Rails'/Nether
[11:57:16] [Server thread/INFO]: Saving chunks for level 'Rails'/The End
[11:57:19] [Server thread/INFO]: Starting integrated minecraft server version 16w14a
[11:57:19] [Server thread/INFO]: Generating keypair
[11:57:20] [Server thread/INFO]: Preparing start region for level 0
[11:57:20] [Server thread/INFO]: Changing view distance to 4, from 10
[11:57:20] [Server thread/INFO]: Foltrox[local:E:b38a9de8] logged in with entity id 4800 at (14.954075685443874, 6.200000047683716, 3.699999988079071)
[11:57:20] [Server thread/INFO]: Foltrox joined the game
[11:57:21] [Server thread/INFO]: Saving and pausing game...
[11:57:21] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Overworld
[11:57:21] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Nether
[11:57:21] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/The End
[12:06:27] [Server thread/INFO]: [Foltrox: Given [Farmland] * 1 to Foltrox]
[12:06:27] [Client thread/INFO]: [CHAT] Given [Farmland] * 1 to Foltrox
[12:10:48] [Server thread/INFO]: Saving and pausing game...
[12:10:48] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Overworld
[12:10:48] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Nether
[12:10:48] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/The End
[12:10:49] [Server thread/INFO]: Stopping server
[12:10:49] [Server thread/INFO]: Saving players
[12:10:49] [Server thread/INFO]: Saving worlds
[12:10:49] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Overworld
[12:10:49] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/Nether
[12:10:49] [Server thread/INFO]: Saving chunks for level 'Rail Mechanics'/The End
[12:10:49] [Client thread/WARN]: Something's taking too long! 'root.tick.textures' took aprox 492.613619 ms
[12:10:49] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 493.18129 ms
[12:10:49] [Client thread/WARN]: Something's taking too long! 'root' took aprox 503.423699 ms
[12:10:50] [Client thread/INFO]: Stopping!
[12:10:50] [Client thread/INFO]: SoundSystem shutting down...
[12:10:50] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com

migrated 2016-04-09T16:44:17Z

Cannot seem to reproduce as of 16w14a (See Game Output) Just says [Client thread/WARN]: Received passengers for unknown entity It's possible it might have been fixed.

[12:30:43] [Client thread/INFO]: Setting user: Foltrox
[12:30:46] [Client thread/INFO]: LWJGL Version: 2.9.4
[12:30:47] [Client thread/INFO]: Reloading ResourceManager: Default
[12:30:48] [Sound Library Loader/INFO]: Starting up SoundSystem...
[12:30:48] [Thread-5/INFO]: Initializing LWJGL OpenAL
[12:30:48] [Thread-5/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[12:30:48] [Thread-5/INFO]: OpenAL initialized.
[12:30:48] [Sound Library Loader/INFO]: Sound engine started
[12:30:50] [Client thread/INFO]: Created: 1024x512 textures-atlas
[12:30:57] [Server thread/INFO]: Starting integrated minecraft server version 16w14a
[12:30:57] [Server thread/INFO]: Generating keypair
[12:30:58] [Server thread/INFO]: Preparing start region for level 0
[12:30:58] [Server thread/INFO]: Changing view distance to 4, from 10
[12:30:59] [Server thread/INFO]: Foltrox[local:E:6de211b0] logged in with entity id 4 at (14.437261084663655, 9.963219692960488, -1.7763901952426537)
[12:30:59] [Server thread/INFO]: Foltrox joined the game
[12:30:59] [Server thread/INFO]: Saving and pausing game...
[12:30:59] [Server thread/INFO]: Saving chunks for level 'Dev'/Overworld
[12:30:59] [Server thread/INFO]: Saving chunks for level 'Dev'/Nether
[12:30:59] [Server thread/INFO]: Saving chunks for level 'Dev'/The End
[12:31:03] [Client thread/INFO]: [CHAT] [Debug]: Hitboxes: shown
[12:31:09] [Client thread/WARN]: Something's taking too long! 'root' took aprox 107.412295 ms
[12:31:27] [Server thread/INFO]: Saving and pausing game...
[12:31:27] [Server thread/INFO]: Saving chunks for level 'Dev'/Overworld
[12:31:27] [Server thread/INFO]: Saving chunks for level 'Dev'/Nether
[12:31:27] [Server thread/INFO]: Saving chunks for level 'Dev'/The End
[12:31:35] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 103.563983 ms
[12:31:35] [Client thread/WARN]: Something's taking too long! 'root' took aprox 104.116076 ms
[12:31:55] [Server thread/INFO]: [Foltrox: Object successfully summoned]
[12:31:55] [Client thread/INFO]: [CHAT] Object successfully summoned
[12:31:59] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 191.878723 ms
[12:31:59] [Client thread/WARN]: Something's taking too long! 'root' took aprox 202.060337 ms
[12:32:13] [Server thread/INFO]: [Foltrox: Block placed]
[12:32:13] [Client thread/INFO]: [CHAT] Block placed
[12:32:18] [Client thread/WARN]: Something's taking too long! 'root.tick.level' took aprox 130.231632 ms
[12:32:18] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 139.809096 ms
[12:32:18] [Client thread/WARN]: Something's taking too long! 'root' took aprox 160.614226 ms
[12:32:22] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 197.669051 ms
[12:32:22] [Client thread/WARN]: Something's taking too long! 'root' took aprox 198.078656 ms
[12:32:39] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level.terrain_setup.update' took aprox 191.749915 ms
[12:32:39] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level.terrain_setup' took aprox 194.008442 ms
[12:32:39] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level' took aprox 196.247211 ms
[12:32:39] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer' took aprox 203.072191 ms
[12:32:39] [Client thread/WARN]: Something's taking too long! 'root' took aprox 204.427915 ms
[12:32:47] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.gui.debug' took aprox 115.486987 ms
[12:32:47] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.gui' took aprox 117.560091 ms
[12:32:47] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer' took aprox 124.931463 ms
[12:32:47] [Client thread/WARN]: Something's taking too long! 'root' took aprox 125.56715 ms
[12:33:10] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.gui.debug' took aprox 163.225743 ms
[12:33:10] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.gui' took aprox 164.875183 ms
[12:33:10] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer' took aprox 173.13036 ms
[12:33:10] [Client thread/WARN]: Something's taking too long! 'root' took aprox 173.959069 ms
[12:33:33] [Client thread/WARN]: Received passengers for unknown entity
[12:33:36] [Server thread/INFO]: Saving and pausing game...
[12:33:36] [Server thread/INFO]: Saving chunks for level 'Dev'/Overworld
[12:33:36] [Server thread/INFO]: Saving chunks for level 'Dev'/Nether
[12:33:36] [Server thread/INFO]: Saving chunks for level 'Dev'/The End
[12:33:56] [Client thread/WARN]: Something's taking too long! 'root' took aprox 126.745808 ms
[12:33:56] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 104.871831 ms
[12:33:56] [Client thread/WARN]: Something's taking too long! 'root' took aprox 157.695313 ms
[12:33:56] [Client thread/WARN]: Something's taking too long! 'root' took aprox 116.333176 ms
[12:33:56] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 114.814825 ms
[12:33:56] [Client thread/WARN]: Something's taking too long! 'root' took aprox 141.360125 ms
[12:33:56] [Client thread/WARN]: Something's taking too long! 'root' took aprox 113.965977 ms
[12:34:05] [Client thread/WARN]: Something's taking too long! 'root.tick.textures' took aprox 101.063035 ms
[12:34:05] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 103.098903 ms
[12:34:05] [Client thread/WARN]: Something's taking too long! 'root' took aprox 112.849632 ms
[12:34:15] [Server thread/INFO]: [Foltrox: Object successfully summoned]
[12:34:15] [Client thread/INFO]: [CHAT] Object successfully summoned
[12:34:46] [Server thread/INFO]: [Foltrox: Object successfully summoned]
[12:34:46] [Client thread/INFO]: [CHAT] Object successfully summoned
[12:34:52] [Client thread/WARN]: Something's taking too long! 'root' took aprox 141.770109 ms
[12:35:01] [Client thread/WARN]: Something's taking too long! 'root' took aprox 108.601214 ms
[12:35:14] [Server thread/INFO]: [Foltrox: Object successfully summoned]
[12:35:14] [Client thread/INFO]: [CHAT] Object successfully summoned
[12:40:42] [Client thread/WARN]: Something's taking too long! 'root.tick.level.blocks.getChunk' took aprox 122.889517 ms
[12:40:42] [Client thread/WARN]: Something's taking too long! 'root.tick.level.blocks' took aprox 123.55864 ms
[12:40:42] [Client thread/WARN]: Something's taking too long! 'root.tick.level' took aprox 124.044619 ms
[12:40:42] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 129.734634 ms
[12:40:42] [Client thread/WARN]: Something's taking too long! 'root' took aprox 140.058356 ms
[12:41:14] [Server thread/INFO]: Saving and pausing game...
[12:41:14] [Server thread/INFO]: Saving chunks for level 'Dev'/Overworld
[12:41:14] [Server thread/INFO]: Saving chunks for level 'Dev'/Nether
[12:41:14] [Server thread/INFO]: Saving chunks for level 'Dev'/The End
[12:41:25] [Client thread/WARN]: Received passengers for unknown entity
[12:41:31] [Server thread/INFO]: Saving and pausing game...
[12:41:31] [Server thread/INFO]: Saving chunks for level 'Dev'/Overworld
[12:41:31] [Server thread/INFO]: Saving chunks for level 'Dev'/Nether
[12:41:31] [Server thread/INFO]: Saving chunks for level 'Dev'/The End
[12:41:33] [Server thread/INFO]: Stopping server
[12:41:33] [Server thread/INFO]: Saving players
[12:41:33] [Server thread/INFO]: Saving worlds
[12:41:33] [Server thread/INFO]: Saving chunks for level 'Dev'/Overworld
[12:41:33] [Server thread/INFO]: Saving chunks for level 'Dev'/Nether
[12:41:33] [Server thread/INFO]: Saving chunks for level 'Dev'/The End
[12:41:33] [Client thread/WARN]: Something's taking too long! 'root.tick.textures' took aprox 516.287123 ms
[12:41:33] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 516.787921 ms
[12:41:33] [Client thread/WARN]: Something's taking too long! 'root' took aprox 532.990121 ms
[12:41:34] [Client thread/INFO]: Stopping!
[12:41:34] [Client thread/INFO]: SoundSystem shutting down...
[12:41:34] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com

migrated 2016-04-09T17:13:45Z

Confirmed for 16w14a.

/summon EnderCrystal ~ ~1 ~ {Passengers:[{id:"Enderman",NoAI:1,Silent:1}]}

I noticed that bug initially due to letting an Enderman riding an EnderCrystal.
This bug is still existing in the current snapshot 16w14a.
After some testing (see attached screenshots) the bug message in the game output occurs dependant on the render distance.

I tested 8 and 16 chunks, both of which triggered said message for the EnderCrystal-Enderman-combination when you got into the 8 or 16 chunks render distance.

Both entities got different render distances.

marcono1234 2016-04-10T14:05:28Z

Please link to this comment in the description

The following is based on decompiled version of Minecraft 1.9 using MCP 9.24 beta. All method and class names are the names used in the decompiled version.

The reason why this happens is because the client receives a net.minecraft.network.play.server.SPacketSetPassengers packet for an entity that is not loaded client-side ("Received passengers for unknown entity") or the packet contains passengers that are not loaded ("Received unknown passenger for [entity]").
The problem is that the server sends these packets without calling the method net.minecraft.entity.EntityTrackerEntry.func_180233_c(EntityPlayerMP) first to test if the entity whose passengers should be set are loaded. Additionally this packet creates a list of entities that are passengers without testing if they are loaded. If this behaviour of the packet was changed to only include loaded passengers, the method net.minecraft.entity.EntityTrackerEntry.updatePlayerEntity(EntityPlayerMP) probably would need to send a passengers packet for the ridden entity (see this comment). This method would also need to test if the ridden entity is loaded before sending packets to the client.

Note: Fixing this bug might fix MC-96954 as well.

Asteraoth 2016-05-02T00:32:45Z

Confirm for 1.9.3 pre-2

NeunEinser 2016-06-08T17:11:44Z

Can confirm for 1.10.

migrated 2016-06-21T23:17:02Z

Can confirm for 1.10 but to also add on Im a very committed survival player that plays all legit which means no commands and such of the sort. I recently received this error in an all legit survival world that I have had for almost a year now. I am going to put the logs below(As you can see I am using optifine but I am quite sure its not the issue):

[18:45:17] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Overworld
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(IntegratedServer.java:324)
	at bzl.C(IntegratedServer.java:224)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
[18:45:18] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Nether
[18:45:18] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/The End
[18:45:18] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(IntegratedServer.java:324)
	at net.minecraft.server.MinecraftServer.C(SourceFile:572)
	at bzl.C(IntegratedServer.java:239)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
[18:46:01] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
[18:46:13] [Server thread/INFO]: Saving and pausing game...
[18:46:13] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Overworld
[18:46:13] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Nether
[18:46:13] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/The End
[18:46:45] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(IntegratedServer.java:324)
	at net.minecraft.server.MinecraftServer.C(SourceFile:572)
	at bzl.C(IntegratedServer.java:239)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
[18:47:18] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(IntegratedServer.java:324)
	at net.minecraft.server.MinecraftServer.C(SourceFile:572)
	at bzl.C(IntegratedServer.java:239)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
[18:48:03] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
[18:48:34] [Server thread/INFO]: Saving and pausing game...
[18:48:34] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Overworld
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(IntegratedServer.java:324)
	at bzl.C(IntegratedServer.java:224)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
[18:48:34] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/Nether
[18:48:34] [Server thread/INFO]: Saving chunks for level 'Avience 2.6.2'/The End
[18:48:40] [Server thread/INFO]: Changing view distance to 10, from 2
[18:48:40] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
[18:48:40] [Client thread/WARN]: Received passengers for unknown entity
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(IntegratedServer.java:324)
	at net.minecraft.server.MinecraftServer.C(SourceFile:572)
	at bzl.C(IntegratedServer.java:239)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
[18:49:15] [Client thread/ERROR]: Item entity 25189 has no item?!
[18:49:15] [Client thread/ERROR]: Item entity 25189 has no item?!
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(IntegratedServer.java:324)
	at net.minecraft.server.MinecraftServer.C(SourceFile:572)
	at bzl.C(IntegratedServer.java:239)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(IntegratedServer.java:324)
	at net.minecraft.server.MinecraftServer.C(SourceFile:572)
	at bzl.C(IntegratedServer.java:239)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(IntegratedServer.java:324)
	at net.minecraft.server.MinecraftServer.C(SourceFile:572)
	at bzl.C(IntegratedServer.java:239)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
java.lang.IllegalArgumentException: Name and ID cannot both be blank
	at com.mojang.authlib.GameProfile.<init>(GameProfile.java:25)
	at ml.a(SourceFile:81)
	at ml.a(SourceFile:140)
	at vv.b(SourceFile:455)
	at vx.b(SourceFile:228)
	at baj.a(SourceFile:92)
	at baj.a(SourceFile:78)
	at ls.a(SourceFile:927)
	at ls.a(SourceFile:879)
	at net.minecraft.server.MinecraftServer.a(SourceFile:372)
	at bzl.a(IntegratedServer.java:324)
	at net.minecraft.server.MinecraftServer.C(SourceFile:572)
	at bzl.C(IntegratedServer.java:239)
	at net.minecraft.server.MinecraftServer.run(SourceFile:458)
	at java.lang.Thread.run(Thread.java:745)
[18:52:36] [Client thread/ERROR]: Item entity 141202 has no item?!
[18:52:36] [Client thread/ERROR]: Item entity 141202 has no item?!
[18:55:04] [Client thread/WARN]: Received passengers for unknown entity
[18:55:14] [Server thread/WARN]: Keeping entity EntityHorse that already exists with UUID f6989676-042a-46bb-962c-ac7632c51754
[18:55:15] [Client thread/WARN]: Received passengers for unknown entity
[18:55:22] [Client thread/WARN]: Received passengers for unknown entity
[18:55:25] [Client thread/WARN]: Received passengers for unknown entity
[18:55:27] [Client thread/WARN]: Received passengers for unknown entity
[18:55:28] [Client thread/WARN]: Received passengers for unknown entity
[18:55:49] [Client thread/WARN]: Received passengers for unknown entity
[18:56:03] [Client thread/WARN]: Received passengers for unknown entity
[19:07:58] [Client Shutdown Thread/INFO]: Stopping server
[19:07:58] [Client Shutdown Thread/INFO]: Saving players

migrated 2016-06-22T19:02:01Z

No, modded clients are not supported here. Your issue looks like it's caused by bad player skulls. Create a new ticket with some more info if this also happens in vanilla, assuming this is a vanilla survival world.

NeunEinser 2016-08-10T14:02:43Z

Can confirm for 16w32a.

NeunEinser 2016-08-10T21:09:22Z

It seems like the game output in 16w32a is always "[Client thread/WARN]: Received passengers for unknown entity" now, even if it should be an unknown passenger for an Entity.

migrated 2016-09-02T15:52:15Z

Confirmed for 16w35a.

migrated 2016-11-06T11:10:44Z

Is this still an issue in the latest snapshot 16w44a? If so please update the affected versions.

This is an automated comment on any open or reopened issue with out-of-date affected versions.

migrated 2016-11-11T19:14:19Z

Confirmed for pre-1: Still "Received passengers for unknown entity" in the client output.

migrated 2016-12-15T17:30:04Z

Confirmed for 16w50a.

NeunEinser 2017-01-21T12:48:52Z

can confirm for 1.11.2. Please change the entity id in the commands to "ender_crystal" to match the 1.11 names.

migrated 2017-04-27T13:39:48Z

Confirmed for 17w17a.

migrated 2017-05-04T11:54:49Z

Confirmed for 17w18a.

migrated 2017-05-11T11:26:55Z

Confirmed for 1.12 pre-1.

migrated 2017-05-17T19:52:13Z

Confirmed for 1.12 pre-3.

migrated 2017-05-19T14:47:55Z

Confirmed for 1.12 pre-5.

migrated 2017-06-05T08:52:26Z

Confirmed for 1.12 pre-7.

migrated 2017-06-13T17:29:44Z

Confirmed for 1.12 release.

migrated 2017-08-06T12:01:05Z

Confirmed for 1.12.1.

migrated 2017-09-15T17:50:29Z

Confirmed for 1.12.2 pre-2.

migrated 2017-09-19T10:53:38Z

Confirmed for 1.12.2 release.

migrated 2017-10-26T15:43:47Z

Confirmed for 17w43b.

migrated 2017-11-21T16:43:41Z

Confirmed for 17w46a.

migrated 2017-11-22T19:54:19Z

Confirmed for 17w47a.

migrated 2017-11-27T19:56:36Z

Confirmed for 48a.

migrated 2017-12-18T13:24:07Z

Confirmed for 50a.

migrated 2018-01-03T19:31:17Z

Confirmed for 18w01a.

migrated 2018-01-17T17:50:27Z

Confirmed for 18w03b.

migrated 2018-05-29T19:50:53Z

Confirmed for 18w22a, the message seems to have changed into:
"Received passengers for unknown entity"

migrated 2018-06-09T12:56:00Z

Confirmed for 1.13 pre-1.

migrated 2018-06-15T18:11:32Z

Confirmed for 1.13 pre-2.

migrated 2018-08-16T20:06:33Z

Confirmed for 1.13.1 pre-1.

migrated 2018-10-27T15:09:31Z

Can confirm for 1.13.2.

migrated 2018-11-30T10:15:23Z

Recently I found that when the console outputs 'Received passengers for unknown entity', the game stutters. It's really annoying and unpleasant when this happens a lot (sometimes it can happen every half minute on average). The game version is 1.13.2.

migrated 2018-12-03T12:36:08Z

Confirmed for 18w48b.

migrated 2018-12-09T07:03:41Z

Confirmed for 18w49a.

migrated 2018-12-21T20:18:05Z

Confirmed for 18w50a.

migrated 2019-01-10T19:16:13Z

Confirmed for 19w02a.

migrated 2019-01-19T15:11:23Z

Confirmed for 19w03c.

migrated 2019-02-07T16:56:59Z

Confirmed for 19w06a.

migrated 2019-02-15T18:10:38Z

Confirmed for 19w07a.

migrated 2019-03-31T13:30:48Z

Confirmed for 19w13b.

migrated 2019-04-10T15:51:47Z

Confirmed for 1.14 pre-release 1.

migrated 2019-05-14T12:33:52Z

Confirmed for 1.14.1.

migrated 2019-05-22T15:53:07Z

Confirmed for 1.14.2 pre-3.

migrated 2019-11-20T10:24:46Z

Confirmed for 19w46b.

migrated 2019-11-21T19:08:11Z

Confirmed for 1.15 pre-1.

migrated 2020-02-27T09:16:02Z

Confirmed for 20w09a.

Can I request ownership of this ticket?
I've made Mr. W aware of this bug back in 2015, and run into this every time I visit some of my bugtestworlds anyway.

Skylinerw 2020-02-28T01:19:28Z

Sure, ticket's your now!

migrated 2020-05-06T06:56:09Z

20w18a and all of a sudden i've started getting this issue when i get to a certain point in my base at which time it freezes the game until i tp myself away and everything resumes normally. All client console shows is the "Received passengers for unknown entity" as mentioned .... Only way i resolved it was to kill all entities bar players in a 300 radius of my location

migrated 2020-05-15T17:14:38Z

I have this error happening A-LOT around my base. No clue why till i read this because I get it during the day, in a mob spawn free area (slabbed and lighted up well past 128 blocks radius). Now I am fairly certain I can pinpoint it.

Boats! I have several boats around my base just chilling in the water. I also like to breed turtles. The stupid turtles end up finding the boats, and getting in them. This also happens with foxes randomly as well deciding to go swimming and getting in the boats. Only passengers in entities I have anywhere around. It appears that if you get the right distance away in the right time frame it causes this. If you are moving to fast, or dont go far enough away from the boats, it doesnt happen.

Nixinova 2020-05-29T20:54:55Z

My game just crashed in 20w22a and the very last item in the log was [main/WARN]: Received passengers for unknown entity.

NeunEinser 2020-05-30T10:36:17Z

@unknown That's likely a different issue.
Is there a crash report in [minecraft/crash-reports/crash-<DATE>-client.txt|https://minecrafthopper.net/help/guides/finding-minecraft-data-folder/]?

If so, please create a new ticket with your crash report attached.

Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki

Avoma 2022-03-05T18:26:17Z

Can confirm in 1.18.2.

Avoma 2022-06-27T12:21:00Z

Can confirm in 1.19.

aceplante 2023-04-30T01:35:00Z

I got over 540,000 of these warnings over the course of a few hours. Seems to be caused by charged creepers in oak boats?

migrated 2023-04-30T03:25:20Z

@unknown In which MCJE version did this occur for you?
Are you in Vanilla?

CreeperMagnet_ 2023-05-15T18:34:26Z

Can confirm in 1.20-pre1.

KirbAvion 2023-06-10T12:55:12Z

Confirmed in 1.20.1 release candidate 1.

migrated 2023-08-24T16:43:17Z

Confirmed in 1.20.1 release

minhredstone 2023-12-17T21:05:08Z

Can confirm in 1.20.2 still, except it's just the raw message and no info about the entities

Reply from @unknown:
Please do not confirm tickets for outdated versions. We are currently only accepting confirmations for 1.20.4.

CreeperMagnet_ 2024-01-13T21:25:20Z

Confirmed for 1.20.4.

KirbAvion 2024-04-16T17:59:28Z

Confirmed in 1.20.5 pre-release 3.