I keep hearing ghast noises!

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|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) here.

Please do not place your entire description in the environment field, place it in the description field.

Pigmen and ghasts make noises, where is the bug? Are you hearing them outside the nether?

I am also having this issue. I am on my singleplayer 1.9 world, (I adapted it so there's more diamonds and iron spawning), and I keep hearing random ghast noises, when I am outside the Nether. I do have a nether portal nearby, however. Here is my crash report:

Minecraft Crash Report ----
// There are four lights!

Time: 01/03/16 17:07
Description: Manually triggered debug crash

java.lang.Throwable
at bcf.az(SourceFile:1694)
at bcf.t(SourceFile:1615)
at bcf.av(SourceFile:962)
at bcf.a(SourceFile:392)
at net.minecraft.client.main.Main.main(SourceFile:124)

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

– Head –
Stacktrace:
at bcf.az(SourceFile:1694)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bmt['230Daniel'/217, l='MpServer', x=184.24, y=58.00, z=515.47]]
Chunk stats: MultiplayerChunkCache: 581, 581
Level seed: 0
Level generator: ID 04 - customized, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (220,64,252), Chunk: (at 12,4,12 in 13,15; contains blocks 208,0,240 to 223,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 154117 game time, 225464 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 138 total; [vu['Bat'/284, l='MpServer', x=110.56, y=18.24, z=502.67], bmt['230Daniel'/217, l='MpServer', x=184.24, y=58.00, z=515.47], yi['Creeper'/295, l='MpServer', x=118.50, y=38.00, z=449.50], vu['Bat'/296, l='MpServer', x=120.47, y=32.11, z=462.52], yy['Spider'/297, l='MpServer', x=119.99, y=12.00, z=495.50], yy['Spider'/298, l='MpServer', x=122.09, y=12.00, z=495.50], yw['Skeleton'/299, l='MpServer', x=119.50, y=23.00, z=493.50], yw['Skeleton'/300, l='MpServer', x=123.50, y=23.00, z=491.50], za['Zombie'/301, l='MpServer', x=114.50, y=23.00, z=505.50], za['Zombie'/46, l='MpServer', x=105.50, y=26.00, z=441.50], yi['Creeper'/302, l='MpServer', x=125.50, y=34.00, z=526.50], za['Zombie'/47, l='MpServer', x=105.50, y=26.00, z=440.50], vy['Cow'/303, l='MpServer', x=121.28, y=62.26, z=528.67], vy['Cow'/304, l='MpServer', x=124.24, y=63.00, z=528.48], vy['Cow'/305, l='MpServer', x=122.80, y=62.59, z=532.17], vy['Cow'/306, l='MpServer', x=127.17, y=63.00, z=531.37], yi['Creeper'/307, l='MpServer', x=117.50, y=12.00, z=579.50], za['Zombie'/308, l='MpServer', x=114.50, y=12.00, z=581.50], yd['item.item.dyePowder.black'/315, l='MpServer', x=143.67, y=60.00, z=471.93], yd['item.item.dyePowder.black'/316, l='MpServer', x=135.85, y=60.00, z=468.01], rx['Experience Orb'/317, l='MpServer', x=135.10, y=60.00, z=467.99], rx['Experience Orb'/318, l='MpServer', x=134.94, y=60.00, z=467.87], yd['item.item.dyePowder.black'/319, l='MpServer', x=140.63, y=60.00, z=470.37], rx['Experience Orb'/320, l='MpServer', x=143.42, y=60.00, z=470.09], wg['Squid'/321, l='MpServer', x=127.67, y=62.30, z=493.19], vy['Cow'/322, l='MpServer', x=142.15, y=63.00, z=567.81], yi['Creeper'/323, l='MpServer', x=130.50, y=20.00, z=587.50], vy['Cow'/324, l='MpServer', x=139.67, y=64.00, z=584.56], vy['Cow'/325, l='MpServer', x=142.28, y=64.00, z=591.18], za['Zombie'/327, l='MpServer', x=148.57, y=11.00, z=470.75], yd['item.item.dyePowder.black'/328, l='MpServer', x=158.98, y=58.00, z=468.72], rx['Experience Orb'/329, l='MpServer', x=159.59, y=58.00, z=468.46], rx['Experience Orb'/330, l='MpServer', x=144.11, y=60.00, z=475.12], vy['Cow'/331, l='MpServer', x=148.16, y=64.00, z=590.04], rx['Experience Orb'/346, l='MpServer', x=174.58, y=61.00, z=460.79], za['Zombie'/347, l='MpServer', x=164.75, y=13.00, z=470.48], yi['Creeper'/348, l='MpServer', x=176.01, y=14.00, z=467.60], yi['Creeper'/349, l='MpServer', x=172.50, y=14.00, z=469.50], yd['item.item.dyePowder.black'/350, l='MpServer', x=171.55, y=61.00, z=464.06], aag['Boat'/351, l='MpServer', x=166.75, y=62.52, z=505.25], wd['Rabbit'/352, l='MpServer', x=169.22, y=64.00, z=580.98], yd['item.item.rottenFlesh'/358, l='MpServer', x=177.27, y=14.00, z=463.18], vu['Bat'/359, l='MpServer', x=179.11, y=14.74, z=461.67], vu['Bat'/360, l='MpServer', x=180.76, y=33.26, z=467.62], vy['Cow'/104, l='MpServer', x=175.52, y=69.00, z=437.83], vu['Bat'/361, l='MpServer', x=185.65, y=32.17, z=453.73], vx['Chicken'/362, l='MpServer', x=179.37, y=62.52, z=461.23], yd['item.item.egg'/363, l='MpServer', x=179.98, y=62.00, z=460.79], yw['Skeleton'/364, l='MpServer', x=184.34, y=27.00, z=477.49], vx['Chicken'/365, l='MpServer', x=180.88, y=62.41, z=465.60], yd['item.item.egg'/366, l='MpServer', x=184.53, y=61.00, z=466.92], wd['Rabbit'/110, l='MpServer', x=192.51, y=71.00, z=437.59], vu['Bat'/367, l='MpServer', x=186.25, y=30.10, z=487.45], yw['Skeleton'/368, l='MpServer', x=179.50, y=24.00, z=487.50], yw['Skeleton'/369, l='MpServer', x=179.50, y=24.00, z=488.50], yw['Skeleton'/370, l='MpServer', x=186.50, y=28.00, z=490.50], vu['Bat'/371, l='MpServer', x=182.54, y=44.10, z=493.45], yw['Skeleton'/372, l='MpServer', x=182.50, y=41.00, z=494.30], yi['Creeper'/373, l='MpServer', x=183.17, y=43.00, z=496.46], yd['item.tile.dirt.default'/374, l='MpServer', x=190.88, y=60.00, z=504.81], yd['item.tile.dirt.default'/375, l='MpServer', x=189.13, y=62.00, z=505.13], yw['Skeleton'/119, l='MpServer', x=212.50, y=26.00, z=438.50], yd['item.tile.dirt.default'/376, l='MpServer', x=188.88, y=61.00, z=507.14], za['Zombie'/120, l='MpServer', x=211.50, y=30.00, z=436.50], yd['item.tile.dirt.default'/377, l='MpServer', x=187.13, y=62.00, z=507.52], yd['item.tile.dirt.default'/378, l='MpServer', x=189.84, y=61.00, z=504.76], yd['item.tile.dirt.default'/379, l='MpServer', x=190.99, y=61.00, z=505.72], yd['item.tile.dirt.default'/380, l='MpServer', x=188.13, y=61.00, z=507.55], yd['item.tile.dirt.default'/381, l='MpServer', x=188.28, y=61.00, z=508.98], yd['item.tile.dirt.default'/382, l='MpServer', x=187.13, y=61.00, z=509.25], yd['item.tile.dirt.default'/383, l='MpServer', x=189.13, y=61.00, z=508.45], yd['item.tile.dirt.default'/384, l='MpServer', x=186.13, y=59.00, z=511.13], yw['Skeleton'/128, l='MpServer', x=224.50, y=30.00, z=445.50], yd['item.tile.dirt.default'/385, l='MpServer', x=187.13, y=60.00, z=510.55], yw['Skeleton'/129, l='MpServer', x=224.50, y=30.00, z=445.50], yd['item.tile.dirt.default'/386, l='MpServer', x=182.13, y=59.00, z=511.13], yw['Skeleton'/130, l='MpServer', x=229.50, y=35.00, z=440.50], yd['item.tile.dirt.default'/387, l='MpServer', x=181.13, y=59.00, z=511.13], vy['Cow'/131, l='MpServer', x=236.39, y=68.00, z=441.35], za['Zombie'/388, l='MpServer', x=191.50, y=26.00, z=535.50], vy['Cow'/132, l='MpServer', x=236.62, y=68.00, z=436.66], wd['Rabbit'/389, l='MpServer', x=177.50, y=65.00, z=579.50], vu['Bat'/392, l='MpServer', x=202.56, y=44.05, z=475.39], yj['Enderman'/393, l='MpServer', x=190.48, y=45.00, z=503.43], yd['item.tile.dirt.default'/394, l='MpServer', x=193.88, y=60.00, z=507.97], yd['item.tile.dirt.default'/395, l='MpServer', x=193.88, y=61.00, z=506.16], yd['item.tile.dirt.default'/396, l='MpServer', x=193.88, y=60.00, z=505.74], yd['item.tile.dirt.default'/397, l='MpServer', x=193.13, y=60.00, z=507.67], yd['item.tile.dirt.default'/398, l='MpServer', x=194.88, y=61.00, z=507.83], yd['item.tile.dirt.default'/399, l='MpServer', x=195.44, y=61.00, z=508.61], yd['item.tile.dirt.default'/400, l='MpServer', x=196.01, y=61.00, z=507.75], yd['item.tile.dirt.default'/401, l='MpServer', x=196.88, y=61.00, z=507.62], yd['item.tile.dirt.default'/402, l='MpServer', x=196.49, y=54.00, z=509.14], yd['item.tile.dirt.default'/403, l='MpServer', x=194.75, y=54.00, z=510.29], yd['item.tile.dirt.default'/404, l='MpServer', x=196.30, y=61.00, z=508.69], rx['Experience Orb'/405, l='MpServer', x=193.24, y=52.00, z=505.71], yi['Creeper'/406, l='MpServer', x=200.50, y=38.00, z=518.50], yi['Creeper'/407, l='MpServer', x=205.22, y=39.00, z=515.40], yd['item.item.spiderEye'/408, l='MpServer', x=193.65, y=59.00, z=513.53], rx['Experience Orb'/409, l='MpServer', x=194.33, y=57.00, z=512.54], vu['Bat'/410, l='MpServer', x=192.64, y=26.10, z=539.25], vx['Chicken'/411, l='MpServer', x=194.68, y=64.00, z=564.55], yd['item.item.egg'/412, l='MpServer', x=194.60, y=64.00, z=564.92], wd['Rabbit'/413, l='MpServer', x=194.51, y=66.00, z=587.78], vy['Cow'/428, l='MpServer', x=213.23, y=67.00, z=453.32], yi['Creeper'/429, l='MpServer', x=211.50, y=29.00, z=490.50], za['Zombie'/430, l='MpServer', x=216.22, y=37.00, z=500.62], za['Zombie'/431, l='MpServer', x=217.50, y=36.00, z=502.50], vy['Cow'/432, l='MpServer', x=218.02, y=63.00, z=543.05], vy['Cow'/433, l='MpServer', x=219.15, y=63.00, z=555.03], vy['Cow'/434, l='MpServer', x=222.53, y=63.00, z=560.77], vy['Cow'/437, l='MpServer', x=225.45, y=64.00, z=449.45], yd['item.item.egg'/438, l='MpServer', x=227.35, y=78.00, z=481.16], vx['Chicken'/439, l='MpServer', x=225.51, y=85.00, z=481.64], vy['Cow'/440, l='MpServer', x=232.57, y=63.00, z=547.82], vu['Bat'/444, l='MpServer', x=254.68, y=11.61, z=463.87], vu['Bat'/445, l='MpServer', x=248.69, y=20.02, z=467.75], vy['Cow'/446, l='MpServer', x=255.50, y=79.00, z=488.50], yi['Creeper'/452, l='MpServer', x=262.50, y=14.00, z=475.50], yd['item.tile.dirt.default'/218, l='MpServer', x=188.13, y=58.00, z=517.79], yd['item.tile.dirt.default'/219, l='MpServer', x=186.18, y=59.00, z=518.55], yd['item.tile.dirt.default'/220, l='MpServer', x=189.88, y=61.00, z=515.88], yd['item.tile.dirt.default'/221, l='MpServer', x=191.88, y=59.00, z=515.41], yd['item.tile.dirt.default'/222, l='MpServer', x=191.13, y=59.00, z=515.61], yd['item.tile.dirt.default'/223, l='MpServer', x=188.13, y=59.00, z=516.65], yd['item.tile.dirt.default'/224, l='MpServer', x=181.97, y=59.00, z=513.60], yd['item.tile.dirt.default'/225, l='MpServer', x=180.83, y=59.00, z=512.76], yd['item.tile.dirt.default'/226, l='MpServer', x=181.13, y=59.00, z=514.63], yd['item.tile.dirt.default'/227, l='MpServer', x=181.38, y=59.00, z=515.56], yd['item.tile.dirt.default'/228, l='MpServer', x=181.13, y=59.00, z=516.97], yd['item.tile.dirt.default'/229, l='MpServer', x=182.07, y=59.00, z=517.88], yd['item.tile.dirt.default'/230, l='MpServer', x=183.88, y=59.00, z=518.88], yd['item.tile.dirt.default'/231, l='MpServer', x=180.13, y=59.00, z=514.54], yd['item.tile.dirt.default'/232, l='MpServer', x=181.82, y=62.00, z=517.80], yd['item.tile.dirt.default'/233, l='MpServer', x=183.64, y=62.00, z=517.88], yd['item.tile.dirt.default'/234, l='MpServer', x=184.27, y=59.00, z=513.05], yd['item.tile.dirt.default'/235, l='MpServer', x=185.13, y=59.00, z=513.70], yd['item.tile.stonebrick'/236, l='MpServer', x=183.17, y=58.00, z=513.13]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bku.a(SourceFile:365)
at bcf.b(SourceFile:2515)
at bcf.a(SourceFile:401)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.9
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_66, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 205027240 bytes (195 MB) / 419237888 bytes (399 MB) up to 2134114304 bytes (2035 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Launched Version: 1.9
LWJGL: 2.9.4
OpenGL: AMD Radeon(TM) R5 Graphics GL version 4.3.12804 Compatibility Profile Context 13.352.1004.1016, ATI Technologies Inc.
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:
Current Language: English (UK)
Profiler Position: N/A (disabled)
CPU: 4x AMD A8-6410 APU with AMD Radeon R5 Graphics

Is that ambient noise ?