I ran for-stable-3.13 branch and still ran the IOzone
./iozone -s 16g -i 0 -i 1 -i 2 -t 4 -r 4k -+w 50 -+y 20 -+C 60 -F
/mnt/btrfs/test1 /mnt/btrfs/test2 /mnt/btrfs/test3 /mnt/btrfs/test
the following bug_on is triggered. The following is CALL TRACE
[ 318.694805] btrfs: device fsid 1130b5e3-5e6a-4746-9ebf-4c0ecb237857
devid 1 transid 4 /dev/sdb
[ 318.695025] btrfs: disabling disk space caching
[ 318.695028] btrfs: force zlib compression
[ 318.695029] btrfs flagging fs with big metadata feature
[ 318.696120] Btrfs detected SSD devices, enabling SSD mode
[ 318.696548] btrfs: creating UUID tree
[ 1955.144474] ------------[ cut here ]------------
[ 1955.144484] kernel BUG at
/home/btrfs-linux-public/btrfs-3.13-stable/ctree.c:3166!
[ 1955.144495] invalid opcode: 0000 [#1] SMP
[ 1955.144512] Modules linked in: btrfs(O) raid6_pq xor libcrc32c
dm_crypt snd_hda_codec_hdmi snd_hda_codec_via snd_hda_intel
snd_hda_codec rfcomm bnep bluetooth snd_hwdep snd_pcm snd_seq_midi
snd_rawmidi parport_pc snd_seq_midi_event snd_seq ppdev snd_timer
eeepc_wmi snd_seq_device asus_wmi sparse_keymap alx(O) hid_generic snd
psmouse mdio serio_raw compat(O) lpc_ich soundcore wmi snd_page_alloc
mac_hid lp parport usbhid hid video [last unloaded: btrfs]
[ 1955.144646] CPU: 2 PID: 2811 Comm: btrfs-endio-wri Tainted: G
O 3.13.5 #1
[ 1955.144654] Hardware name: System manufacturer System Product
Name/P8H77-V, BIOS 0607 04/24/2012
[ 1955.144669] task: ffff8801f5404560 ti: ffff880002ef2000 task.ti:
ffff880002ef2000
[ 1955.144682] RIP: 0010:[<ffffffffa02f8921>] [<ffffffffa02f8921>]
btrfs_set_item_key_safe+0x141/0x150 [btrfs]
[ 1955.144707] RSP: 0018:ffff880002ef3ae8 EFLAGS: 00010246
[ 1955.144717] RAX: 0000000000000000 RBX: 0000000000000042 RCX: 0000000069288000
[ 1955.144729] RDX: 0000000000000000 RSI: ffff880002ef3c27 RDI: ffff880002ef3ac7
[ 1955.144761] RBP: ffff880002ef3b48 R08: 00000000ffffffff R09: 0000000000000000
[ 1955.144787] R10: 0000000000000000 R11: 0000000000000003 R12: ffff8800c9ab7040
[ 1955.144814] R13: ffff880002ef3c27 R14: ffff880002ef3b07 R15: ffff880214961630
[ 1955.144841] FS: 0000000000000000(0000) GS:ffff88021ed00000(0000)
knlGS:0000000000000000
[ 1955.144882] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1955.144906] CR2: 00007f6c85221000 CR3: 0000000001c0b000 CR4: 00000000000407e0
[ 1955.144933] Stack:
[ 1955.144951] ffff880002ef3b48 ffff88002cd4d000 ffff8800bb7c0000
0100000000003000
[ 1955.144996] 6c00000000000001 0000000069288000 ffff880002ef3b48
ffff880214961630
[ 1955.145041] ffff8800c9ab7040 0000000069287000 0000000000000001
0000000000000000
[ 1955.145086] Call Trace:
[ 1955.145114] [<ffffffffa032fdb0>] __btrfs_drop_extents+0x5a0/0xb90
[btrfs]
[ 1955.145145] [<ffffffffa02fc33d>] ?
setup_items_for_insert+0x2cd/0x3d0 [btrfs]
[ 1955.145192] [<ffffffffa0330ebe>] btrfs_drop_extents+0x6e/0xa0 [btrfs]
[ 1955.145224] [<ffffffffa032038b>]
insert_reserved_file_extent.constprop.64+0x7b/0x2c0 [btrfs]
[ 1955.145272] [<ffffffffa031ded6>] ? start_transaction+0x96/0x570
[btrfs]
[ 1955.145303] [<ffffffffa0326255>] btrfs_finish_ordered_io+0x465/0x500
[btrfs]
[ 1955.145335] [<ffffffffa0326305>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 1955.145368] [<ffffffffa0349f0a>] worker_loop+0x14a/0x530 [btrfs]
[ 1955.145399] [<ffffffffa0349dc0>] ? btrfs_queue_worker+0x300/0x300
[btrfs]
[ 1955.145428] [<ffffffff81070f79>] kthread+0xc9/0xe0
[ 1955.145452] [<ffffffff81070eb0>] ? flush_kthread_worker+0xb0/0xb0
[ 1955.145478] [<ffffffff816a7cec>] ret_from_fork+0x7c/0xb0
[ 1955.145503] [<ffffffff81070eb0>] ? flush_kthread_worker+0xb0/0xb0
[ 1955.145528] Code: 00 00 4c 89 f6 4c 89 e7 48 98 48 8d 04 80 48 8d
54 80 65 e8 c2 42 04 00 4c 89 ee 4c 89 f7 e8 27 f3 ff ff 85 c0 0f 8f
5c ff ff ff <0f> 0b 0f 0b 66 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66
90 55
[ 1955.145694] RIP [<ffffffffa02f8921>]
btrfs_set_item_key_safe+0x141/0x150 [btrfs]
[ 1955.145738] RSP <ffff880002ef3ae8>
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