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Type: Bug
Resolution: Duplicate
Fix Version/s: None
Affects Version/s: Minecraft 1.8, Minecraft 1.8.1-pre4
Labels:
- baby
- cows
- hitbox
- mob
- sheep
- suffocation
- water
Environment:
Win 8.1, Java builds 1.7.0_60-b19 AND 1.8.0_20-b26

Confirmation Status:
Community Consensus
Game Mode:
Creative

When mobs are moving in flowing water in a 1 wide by 2 high tunnel with a solid block above and jump/bob as they move along the water stream, some mob's heads will go into the solid block above them causing suffocation damage. The issue is worsened when there are many mobs in the same area pushing each other.

Mobs that get damaged:
Cows
Baby Cows
Baby Sheep
Mooshrooms
Baby Mooshrooms
Chickens
Baby Chickens

Mobs that do not get damaged:
Sheep
Pigs
Baby Pigs
Wolves
Baby Wolves
Ocelots
Baby Ocelots
Rabbits
Baby Rabbits
Horses (baby horses don't work right now to test)

Possibly related to ~~MC-48544~~ but created new issue as this also affects baby sheep, chickens, and baby chickens. I doubt this "works as intended" when the issue is inconsistent with other mobs.

Force crash message:

---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 9/10/14 10:20 AM
Description: Manually triggered debug crash

java.lang.Throwable
	at bsu.r(SourceFile:1563)
	at bsu.as(SourceFile:877)
	at bsu.a(SourceFile:314)
	at net.minecraft.client.main.Main.main(SourceFile:120)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at cen.a(SourceFile:308)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [cio['theghouse'/6229985, l='MpServer', x=-1235.54, y=54.00, z=-444.10]]
	Chunk stats: MultiplayerChunkCache: 288, 288
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: -1261.00,4.00,-534.00 - World: (-1261,4,-534), Chunk: (at 3,0,10 in -79,-34; contains blocks -1264,0,-544 to -1249,255,-529), Region: (-3,-2; contains chunks -96,-64 to -65,-33, blocks -1536,0,-1024 to -1025,255,-513)
	Level time: 1396632 game time, 1000 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 57 total; [abs['Cow'/9380630, l='MpServer', x=-1238.78, y=51.00, z=-443.25], abs['Cow'/9382796, l='MpServer', x=-1237.34, y=51.00, z=-443.25], abs['Cow'/9379510, l='MpServer', x=-1237.69, y=51.00, z=-443.25], abs['Cow'/9383161, l='MpServer', x=-1236.47, y=51.00, z=-443.56], abs['Cow'/9379892, l='MpServer', x=-1238.78, y=51.00, z=-443.25], abs['Cow'/9385054, l='MpServer', x=-1237.45, y=51.00, z=-443.25], abs['Cow'/9379765, l='MpServer', x=-1237.72, y=50.97, z=-443.25], abs['Cow'/9386392, l='MpServer', x=-1238.78, y=51.00, z=-443.25], abs['Cow'/9383960, l='MpServer', x=-1237.37, y=51.12, z=-443.26], abs['Cow'/9377334, l='MpServer', x=-1238.18, y=51.00, z=-443.78], abs['Cow'/9382534, l='MpServer', x=-1238.47, y=53.09, z=-450.20], abs['Cow'/9385786, l='MpServer', x=-1237.18, y=50.97, z=-443.78], abs['Cow'/9385228, l='MpServer', x=-1238.78, y=51.00, z=-443.25], abs['Cow'/9378195, l='MpServer', x=-1236.47, y=51.00, z=-443.56], abs['Cow'/9378700, l='MpServer', x=-1238.30, y=53.10, z=-445.61], abs['Cow'/9380449, l='MpServer', x=-1238.78, y=51.00, z=-443.25], abs['Cow'/9377972, l='MpServer', x=-1237.00, y=51.00, z=-443.25], abs['Cow'/9382363, l='MpServer', x=-1236.47, y=50.97, z=-443.56], abs['Cow'/9384294, l='MpServer', x=-1238.25, y=53.84, z=-447.08], abs['Cow'/9380170, l='MpServer', x=-1236.76, y=51.00, z=-443.25], abs['Cow'/9379053, l='MpServer', x=-1236.25, y=51.00, z=-443.25], abs['Cow'/9386547, l='MpServer', x=-1238.78, y=51.00, z=-443.25], abs['Cow'/9384619, l='MpServer', x=-1238.44, y=53.44, z=-446.53], abs['Cow'/9381362, l='MpServer', x=-1237.52, y=51.00, z=-443.25], agp['Villager'/6229952, l='MpServer', x=-1290.31, y=54.00, z=-370.84], agp['Villager'/6229953, l='MpServer', x=-1290.72, y=54.00, z=-372.72], agp['Villager'/6229958, l='MpServer', x=-1271.31, y=54.00, z=-372.72], agp['Villager'/6229959, l='MpServer', x=-1271.72, y=54.00, z=-372.72], agp['Villager'/6229962, l='MpServer', x=-1271.72, y=54.00, z=-371.75], abs['Cow'/9384880, l='MpServer', x=-1238.78, y=51.00, z=-443.25], agp['Villager'/6229960, l='MpServer', x=-1271.31, y=54.00, z=-370.72], agp['Villager'/6229961, l='MpServer', x=-1271.72, y=54.00, z=-369.31], abs['Cow'/9377859, l='MpServer', x=-1236.25, y=51.00, z=-443.25], abs['Cow'/9378684, l='MpServer', x=-1238.24, y=51.00, z=-443.56], abs['Cow'/9378411, l='MpServer', x=-1236.25, y=51.00, z=-443.25], cio['theghouse'/6229985, l='MpServer', x=-1235.54, y=54.00, z=-444.10], abs['Cow'/9379345, l='MpServer', x=-1236.25, y=51.00, z=-443.78], abs['Cow'/9378861, l='MpServer', x=-1238.78, y=51.00, z=-443.78], abs['Cow'/9379129, l='MpServer', x=-1238.29, y=53.33, z=-443.94], abs['Cow'/9377192, l='MpServer', x=-1236.47, y=51.00, z=-443.56], abs['Cow'/9377513, l='MpServer', x=-1237.11, y=51.00, z=-443.25], abs['Cow'/9379656, l='MpServer', x=-1238.78, y=50.94, z=-443.25], abs['Cow'/9377747, l='MpServer', x=-1237.70, y=51.00, z=-443.56], abs['Cow'/9383713, l='MpServer', x=-1238.69, y=51.00, z=-443.25], abs['Cow'/9382932, l='MpServer', x=-1237.89, y=51.00, z=-443.25], abs['Cow'/9378094, l='MpServer', x=-1238.97, y=54.31, z=-449.25], abs['Cow'/9384166, l='MpServer', x=-1236.50, y=50.94, z=-443.66], abs['Cow'/9386087, l='MpServer', x=-1237.53, y=51.00, z=-443.25], abs['Cow'/9385625, l='MpServer', x=-1238.78, y=51.00, z=-443.78], abs['Cow'/9378584, l='MpServer', x=-1237.95, y=51.00, z=-443.25], agp['Villager'/6229949, l='MpServer', x=-1290.72, y=54.00, z=-371.91], agp['Villager'/6229948, l='MpServer', x=-1282.72, y=54.00, z=-380.31], agp['Villager'/6229951, l='MpServer', x=-1280.78, y=54.00, z=-380.31], agp['Villager'/6229950, l='MpServer', x=-1282.72, y=54.02, z=-380.31], abs['Cow'/9383463, l='MpServer', x=-1237.47, y=51.00, z=-443.25], abs['Cow'/9385386, l='MpServer', x=-1238.78, y=51.00, z=-443.25], agp['Villager'/6229947, l='MpServer', x=-1281.66, y=54.00, z=-380.72]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at cen.a(SourceFile:308)
	at bsu.b(SourceFile:2252)
	at bsu.a(SourceFile:323)
	at net.minecraft.client.main.Main.main(SourceFile:120)

-- System Details --
Details:
	Minecraft Version: 1.8
	Operating System: Windows 8.1 (x86) version 6.3
	Java Version: 1.7.0_60, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 190317232 bytes (181 MB) / 402026496 bytes (383 MB) up to 523501568 bytes (499 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.8
	LWJGL: 2.9.1
	OpenGL: GeForce GTX 660/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: No
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [Custom.zip]
	Current Language: English (US)
	Profiler Position: N/A (disabled)