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Subject[ext4 BUG?] task pdflush:3880 blocked for more than 120 seconds
This bug exists both in mainline and ext4-patch-queue.

Procedures to reproduce it:
1. mkfs.ext4dev -I 256 -b 4096 -O extents /dev/sdb1
2. mount -t ext4dev -o delalloc /dev/sdb1 mnt_point/
3. run ffsb until filesystem is full and ffsb exits with failure
4. umount mnt_point

And then umount stuck at D state.

The output of ps:
3873 ? D< 0:07 [kjournald2]
3880 ? D 0:00 [pdflush]
3885 ? S 0:00 [pdflush]
3944 ? S 0:00 [pdflush]
3957 ? S 0:00 [pdflush]
3962 ? S 0:00 [pdflush]
3974 ? S 0:00 [pdflush]
3975 ? S 0:00 [pdflush]
3979 pts/1 D+ 0:01 umount mnt_point

dmesg:

EXT4-fs: barriers enabled
kjournald2 starting. Commit interval 5 seconds
EXT4 FS on sdb1, internal journal on sdb1:8
EXT4-fs: mounted filesystem with ordered data mode.
EXT4-fs: delayed allocation enabled
EXT4-fs: file extents enabled
EXT4-fs: mballoc enabled
ffsb[3888]: segfault at 8 ip 0000003878832dc7 sp 00000000425f5fa0 error 4 in libc-2.5.so[3878800000+146000]
INFO: task pdflush:3880 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
pdflush D ffff88013c6eb700 0 3880 2
ffff88009a623df0 0000000000000046 0000000000000000 ffffffff80254c20
ffff8800bfa63040 ffff8800bfa63040 ffff88013faf3040 ffff8800bfa63398
00000002bfa63040 000000010009baab ffffffffffffffff ffffffffffffffff
Call Trace:
[<ffffffff80254c20>] __lock_acquire+0x6ad/0x716
[<ffffffff8049e9de>] __down_read+0x7e/0x96
[<ffffffff802a32a6>] sync_supers+0x3f/0xb3
[<ffffffff802a32a6>] sync_supers+0x3f/0xb3
[<ffffffff8027d50e>] pdflush+0x0/0x207
[<ffffffff8027d0bf>] wb_kupdate+0x2d/0x10d
[<ffffffff8027d50e>] pdflush+0x0/0x207
[<ffffffff8027d50e>] pdflush+0x0/0x207
[<ffffffff8027d664>] pdflush+0x156/0x207
[<ffffffff8027d092>] wb_kupdate+0x0/0x10d
[<ffffffff8024961b>] kthread+0x47/0x74
[<ffffffff8049ea30>] trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff8020cea9>] child_rip+0xa/0x11
[<ffffffff8020c4df>] restore_args+0x0/0x30
[<ffffffff802495d4>] kthread+0x0/0x74
[<ffffffff8020ce9f>] child_rip+0x0/0x11

1 lock held by pdflush/3880:
#0: (&type->s_umount_key#21){----}, at: [<ffffffff802a32a6>] sync_supers+0x3f/0xb3
INFO: task pdflush:3880 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
pdflush D ffff88013c6eb700 0 3880 2
ffff88009a623df0 0000000000000046 0000000000000000 ffffffff80254c20
ffff8800bfa63040 ffff8800bfa63040 ffff88013faf3040 ffff8800bfa63398
00000002bfa63040 000000010009baab ffffffffffffffff ffffffffffffffff
Call Trace:
[<ffffffff80254c20>] __lock_acquire+0x6ad/0x716
[<ffffffff8049e9de>] __down_read+0x7e/0x96
[<ffffffff802a32a6>] sync_supers+0x3f/0xb3
[<ffffffff802a32a6>] sync_supers+0x3f/0xb3
[<ffffffff8027d50e>] pdflush+0x0/0x207
[<ffffffff8027d0bf>] wb_kupdate+0x2d/0x10d
[<ffffffff8027d50e>] pdflush+0x0/0x207
[<ffffffff8027d50e>] pdflush+0x0/0x207
[<ffffffff8027d664>] pdflush+0x156/0x207
[<ffffffff8027d092>] wb_kupdate+0x0/0x10d
[<ffffffff8024961b>] kthread+0x47/0x74
[<ffffffff8049ea30>] trace_hardirqs_on_thunk+0x3a/0x3f
[<ffffffff8020cea9>] child_rip+0xa/0x11
[<ffffffff8020c4df>] restore_args+0x0/0x30
[<ffffffff802495d4>] kthread+0x0/0x74
[<ffffffff8020ce9f>] child_rip+0x0/0x11

1 lock held by pdflush/3880:
#0: (&type->s_umount_key#21){----}, at: [<ffffffff802a32a6>] sync_supers+0x3f/0xb3


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