I was trying to place the top of a sunflower with /setblock (setblock ~ ~ ~ 175 0, 175 1, 175 2...) until I eventually crashed Minecraft. I don't know if it works in singleplayer, but I think it's caused by the top of a two-block flower not having a bottom block. I had a friend go to the same chunks I was in when I crashed and as soon as the chunks were loaded for him, his game crashed.
I will post the crash report in the comments.
Linked issues
duplicates 1
Comments

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.
Time: 11/19/13 11:13 AM
Description: Unexpected error
java.lang.ArrayIndexOutOfBoundsException: 6
at aja.a(SourceFile:151)
at ble.a(SourceFile:3255)
at ble.b(SourceFile:139)
at blg.a(SourceFile:163)
at bls.a(SourceFile:1258)
at bll.a(SourceFile:949)
at bll.b(SourceFile:813)
at azd.ad(SourceFile:780)
at azd.e(SourceFile:704)
at net.minecraft.client.main.Main.main(SourceFile:103)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at aja.a(SourceFile:151)
at ble.a(SourceFile:3255)
at ble.b(SourceFile:139)
at blg.a(SourceFile:163)
at bls.a(SourceFile:1258)
at bll.a(SourceFile:949)
-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bje['ezekielelin'/338, l='MpServer', x=323.53, y=156.59, z=449.23]]
Chunk stats: MultiplayerChunkCache: 240, 240
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (192,64,256), Chunk: (at 0,4,0 in 12,16; contains blocks 192,0,256 to 207,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 1526 game time, 1526 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: 155 total; [xc['Zombie'/2192, l='MpServer', x=308.50, y=55.00, z=478.50], xc['Zombie'/2193, l='MpServer', x=307.50, y=55.00, z=476.50], xc['Zombie'/2194, l='MpServer', x=306.50, y=55.00, z=476.50], wl['Creeper'/3264, l='MpServer', x=295.50, y=67.00, z=482.50], wx['Skeleton'/8770, l='MpServer', x=296.50, y=65.00, z=486.50], wx['Skeleton'/8771, l='MpServer', x=302.50, y=65.00, z=487.50], vw['item.tile.gravel'/6556, l='MpServer', x=346.88, y=58.13, z=481.66], uq['Bat'/2208, l='MpServer', x=313.06, y=48.42, z=400.77], wl['Creeper'/5438, l='MpServer', x=342.78, y=60.00, z=486.16], wx['Skeleton'/1051, l='MpServer', x=333.50, y=35.00, z=471.50], xc['Zombie'/3207, l='MpServer', x=336.50, y=43.00, z=430.50], xc['Zombie'/3209, l='MpServer', x=335.50, y=43.00, z=430.50], wx['Skeleton'/2245, l='MpServer', x=314.50, y=48.00, z=416.50], xc['Zombie'/3208, l='MpServer', x=339.09, y=43.00, z=433.72], wx['Skeleton'/2244, l='MpServer', x=310.50, y=48.00, z=416.50], xc['Zombie'/3210, l='MpServer', x=330.50, y=43.00, z=433.50], wx['Skeleton'/3263, l='MpServer', x=294.50, y=67.00, z=482.50], xc['Zombie'/4533, l='MpServer', x=348.50, y=57.00, z=478.50], xc['Zombie'/6445, l='MpServer', x=345.50, y=41.00, z=412.50], xc['Zombie'/6444, l='MpServer', x=345.50, y=41.00, z=413.50], wl['Creeper'/6447, l='MpServer', x=343.50, y=41.00, z=412.50], wx['Skeleton'/5626, l='MpServer', x=294.50, y=59.00, z=466.59], wl['Creeper'/6446, l='MpServer', x=344.50, y=41.00, z=411.50], uq['Bat'/4506, l='MpServer', x=367.49, y=56.00, z=460.96], uq['Bat'/4504, l='MpServer', x=369.17, y=59.79, z=460.79], uq['Bat'/4503, l='MpServer', x=362.51, y=57.42, z=462.53], uq['Bat'/4502, l='MpServer', x=372.35, y=57.29, z=467.50], xb['Witch'/2134, l='MpServer', x=372.50, y=58.00, z=469.50], wx['Skeleton'/1182, l='MpServer', x=295.50, y=61.00, z=485.50], ut['Cow'/275, l='MpServer', x=279.50, y=90.00, z=404.50], ut['Cow'/278, l='MpServer', x=274.50, y=91.00, z=405.50], ut['Cow'/277, l='MpServer', x=279.13, y=91.00, z=408.78], ut['Cow'/276, l='MpServer', x=276.16, y=90.00, z=404.53], wl['Creeper'/6316, l='MpServer', x=289.50, y=54.00, z=500.50], xc['Zombie'/5237, l='MpServer', x=344.50, y=62.00, z=491.06], vw['item.item.seeds'/305, l='MpServer', x=311.35, y=73.13, z=442.54], vw['item.tile.flower2.poppy'/307, l='MpServer', x=318.20, y=73.13, z=442.86], vw['item.tile.flower2.poppy'/309, l='MpServer', x=311.13, y=73.13, z=442.88], vw['item.tile.flower2.poppy'/308, l='MpServer', x=319.70, y=73.89, z=444.75], vb['Sheep'/291, l='MpServer', x=317.50, y=77.00, z=370.50], wl['Creeper'/6284, l='MpServer', x=299.47, y=57.00, z=480.31], vb['Sheep'/293, l='MpServer', x=317.50, y=93.00, z=374.50], wl['Creeper'/6285, l='MpServer', x=293.50, y=60.00, z=482.50], xc['Zombie'/5162, l='MpServer', x=403.50, y=60.00, z=458.50], bje['ezekielelin'/338, l='MpServer', x=323.53, y=156.59, z=449.23], wl['Creeper'/5167, l='MpServer', x=365.63, y=53.00, z=480.00], wz['Spider'/5166, l='MpServer', x=373.84, y=54.00, z=477.75], vb['Sheep'/337, l='MpServer', x=378.91, y=71.00, z=389.50], wz['Spider'/5165, l='MpServer', x=372.03, y=54.00, z=478.88], vb['Sheep'/336, l='MpServer', x=377.13, y=71.00, z=389.50], va['Pig'/324, l='MpServer', x=352.81, y=71.00, z=397.16], va['Pig'/325, l='MpServer', x=352.81, y=71.00, z=395.50], va['Pig'/322, l='MpServer', x=350.56, y=71.00, z=395.50], va['Pig'/323, l='MpServer', x=346.72, y=73.00, z=391.00], vb['Sheep'/334, l='MpServer', x=377.38, y=72.00, z=396.78], vb['Sheep'/335, l='MpServer', x=375.53, y=71.00, z=391.53], vb['Sheep'/332, l='MpServer', x=372.50, y=70.00, z=370.50], vb['Sheep'/333, l='MpServer', x=371.50, y=70.00, z=374.50], wl['Creeper'/5169, l='MpServer', x=367.50, y=54.00, z=484.50], vb['Sheep'/368, l='MpServer', x=299.88, y=117.00, z=511.44], va['Pig'/381, l='MpServer', x=350.31, y=69.00, z=479.50], va['Pig'/380, l='MpServer', x=334.50, y=67.00, z=518.50], va['Pig'/383, l='MpServer', x=351.34, y=67.00, z=484.47], va['Pig'/382, l='MpServer', x=349.50, y=72.00, z=475.50], va['Pig'/377, l='MpServer', x=332.50, y=67.00, z=517.50], va['Pig'/379, l='MpServer', x=332.50, y=67.00, z=515.50], va['Pig'/378, l='MpServer', x=332.50, y=67.00, z=513.50], vw['item.item.seeds'/364, l='MpServer', x=280.56, y=75.13, z=485.81], vb['Sheep'/365, l='MpServer', x=301.50, y=113.00, z=516.50], vb['Sheep'/366, l='MpServer', x=301.50, y=113.00, z=516.50], vb['Sheep'/367, l='MpServer', x=301.50, y=119.00, z=519.50], va['Pig'/360, l='MpServer', x=278.50, y=122.00, z=519.50], va['Pig'/361, l='MpServer', x=277.50, y=123.00, z=517.84], va['Pig'/362, l='MpServer', x=277.50, y=123.00, z=516.13], va['Pig'/363, l='MpServer', x=274.50, y=124.00, z=519.50], vb['Sheep'/402, l='MpServer', x=386.88, y=67.00, z=501.97], vb['Sheep'/403, l='MpServer', x=391.31, y=68.00, z=499.19], vb['Sheep'/400, l='MpServer', x=397.50, y=70.00, z=507.50], vb['Sheep'/401, l='MpServer', x=395.50, y=69.00, z=506.50], va['Pig'/395, l='MpServer', x=369.50, y=69.00, z=527.50], va['Pig'/394, l='MpServer', x=364.50, y=68.00, z=470.50], va['Pig'/393, l='MpServer', x=362.50, y=69.00, z=470.50], va['Pig'/392, l='MpServer', x=363.22, y=69.00, z=468.50], uq['Bat'/3419, l='MpServer', x=336.09, y=33.01, z=464.78], vb['Sheep'/399, l='MpServer', x=401.50, y=64.00, z=389.50], va['Pig'/398, l='MpServer', x=372.22, y=69.00, z=529.28], va['Pig'/397, l='MpServer', x=373.31, y=69.00, z=529.50], va['Pig'/384, l='MpServer', x=353.50, y=69.00, z=476.50], va['Pig'/391, l='MpServer', x=364.78, y=69.00, z=468.50], xc['Zombie'/9176, l='MpServer', x=261.91, y=80.00, z=420.53], wz['Spider'/9177, l='MpServer', x=262.16, y=80.00, z=419.19], xc['Zombie'/9175, l='MpServer', x=267.50, y=80.00, z=420.50], xc['Zombie'/1511, l='MpServer', x=344.72, y=61.00, z=488.34], xc['Zombie'/1513, l='MpServer', x=342.78, y=61.00, z=490.28], xc['Zombie'/1512, l='MpServer', x=346.59, y=61.00, z=489.25], xc['Zombie'/1514, l='MpServer', x=344.47, y=77.00, z=472.63], wx['Skeleton'/1439, l='MpServer', x=377.53, y=57.00, z=463.94], xc['Zombie'/4346, l='MpServer', x=358.50, y=50.00, z=386.50], wx['Skeleton'/4344, l='MpServer', x=356.50, y=50.00, z=385.50], wx['Skeleton'/1441, l='MpServer', x=371.00, y=58.00, z=457.53], wx['Skeleton'/1440, l='MpServer', x=379.50, y=56.00, z=448.50], wl['Creeper'/1442, l='MpServer', x=380.50, y=56.00, z=447.50], wx['Skeleton'/5974, l='MpServer', x=361.34, y=54.00, z=482.63], wx['Skeleton'/5975, l='MpServer', x=362.94, y=58.00, z=471.50], uq['Bat'/2732, l='MpServer', x=334.03, y=46.10, z=471.75], wl['Creeper'/3817, l='MpServer', x=314.50, y=54.00, z=428.50], wx['Skeleton'/4874, l='MpServer', x=366.06, y=58.00, z=455.56], wm['Enderman'/4916, l='MpServer', x=335.50, y=49.00, z=411.50], ve['Squid'/9275, l='MpServer', x=288.50, y=53.00, z=499.50], ve['Squid'/9277, l='MpServer', x=292.53, y=53.00, z=494.50], uq['Bat'/1629, l='MpServer', x=289.75, y=59.37, z=470.75], wl['Creeper'/2697, l='MpServer', x=314.00, y=48.00, z=426.50], ve['Squid'/9276, l='MpServer', x=296.50, y=53.00, z=501.06], xc['Zombie'/611, l='MpServer', x=327.50, y=53.00, z=521.50], wx['Skeleton'/2815, l='MpServer', x=370.50, y=56.00, z=470.50], wm['Enderman'/4955, l='MpServer', x=338.78, y=44.00, z=406.28], wm['Enderman'/4956, l='MpServer', x=337.91, y=44.00, z=405.63], wl['Creeper'/3719, l='MpServer', x=356.00, y=54.00, z=405.47], wx['Skeleton'/4963, l='MpServer', x=296.50, y=66.00, z=484.50], wx['Skeleton'/3718, l='MpServer', x=351.50, y=53.00, z=406.50], wl['Creeper'/5023, l='MpServer', x=300.50, y=69.00, z=479.50], uq['Bat'/1765, l='MpServer', x=355.00, y=54.73, z=405.41], uq['Bat'/5055, l='MpServer', x=369.25, y=54.00, z=479.24], uq['Bat'/5054, l='MpServer', x=369.68, y=57.30, z=470.69], ve['Squid'/9380, l='MpServer', x=292.56, y=60.00, z=471.53], uq['Bat'/2588, l='MpServer', x=292.00, y=62.95, z=497.50], wl['Creeper'/5024, l='MpServer', x=304.50, y=69.00, z=478.50], wl['Creeper'/5025, l='MpServer', x=301.50, y=69.00, z=480.50], xc['Zombie'/658, l='MpServer', x=291.50, y=59.00, z=469.69], xc['Zombie'/659, l='MpServer', x=296.53, y=60.00, z=470.22], xc['Zombie'/736, l='MpServer', x=324.50, y=44.00, z=458.50], uq['Bat'/1704, l='MpServer', x=288.33, y=59.38, z=471.07], vw['item.tile.doublePlant.sunflower'/9427, l='MpServer', x=340.00, y=91.23, z=453.72], uq['Bat'/5056, l='MpServer', x=364.44, y=53.78, z=483.38], uq['Bat'/4043, l='MpServer', x=373.85, y=57.84, z=463.42], wx['Skeleton'/793, l='MpServer', x=356.50, y=61.00, z=510.50], wx['Skeleton'/4689, l='MpServer', x=372.28, y=54.00, z=477.50], wx['Skeleton'/4690, l='MpServer', x=373.50, y=54.00, z=483.13], wx['Skeleton'/4691, l='MpServer', x=369.84, y=54.00, z=478.25], wx['Skeleton'/4693, l='MpServer', x=369.78, y=54.00, z=479.16], uq['Bat'/2860, l='MpServer', x=314.39, y=54.97, z=495.50], wx['Skeleton'/3960, l='MpServer', x=287.50, y=64.00, z=441.50], uq['Bat'/942, l='MpServer', x=375.85, y=57.70, z=464.90], wl['Creeper'/2879, l='MpServer', x=337.00, y=44.00, z=476.47], wx['Skeleton'/3959, l='MpServer', x=287.63, y=64.00, z=444.84], wx['Skeleton'/3958, l='MpServer', x=289.50, y=64.00, z=448.50], vw['item.tile.gravel'/8698, l='MpServer', x=346.75, y=59.13, z=482.81], wz['Spider'/8684, l='MpServer', x=316.28, y=52.00, z=496.72], vw['item.tile.gravel'/8673, l='MpServer', x=346.00, y=59.13, z=482.78], wl['Creeper'/2880, l='MpServer', x=336.84, y=44.00, z=475.34], wl['Creeper'/5815, l='MpServer', x=376.69, y=58.00, z=460.38], wl['Creeper'/5814, l='MpServer', x=368.88, y=56.00, z=465.16], wl['Creeper'/5812, l='MpServer', x=298.50, y=59.00, z=446.50], wx['Skeleton'/5817, l='MpServer', x=345.47, y=43.00, z=402.94], wx['Skeleton'/5816, l='MpServer', x=339.94, y=41.00, z=411.56]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at biz.a(SourceFile:284)
at azd.b(SourceFile:1951)
at azd.e(SourceFile:718)
at net.minecraft.client.main.Main.main(SourceFile:103)
-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Mac OS X (x86_64) version 10.9.1
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 92783232 bytes (88 MB) / 242016256 bytes (230 MB) up to 4277534720 bytes (4079 MB)
JVM Flags: 1 total; -Xmx4G
AABB Pool Size: 20227 (1132712 bytes; 1 MB) allocated, 1967 (110152 bytes; 0 MB) used
IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
Launched Version: 1.7.2
LWJGL: 2.9.1
OpenGL: AMD Radeon HD 6770M OpenGL Engine GL version 2.1 ATI-1.14.21, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: [EzPack-Custom]
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2575 (144200 bytes; 0 MB) allocated, 443 (24808 bytes; 0 MB) used
Anisotropic Filtering: On (8)
It occurs when you try to do
/setblock ~ ~ ~ 175 5

Duplicate of MC-30484 - 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.
I have searched but I could not find MC-30484.