Hi Ted,

FYI, we noticed that simple dd write can trigger the below BUG in
commit 208b9cc3a32f29b8a9bba682b5bfbb962bc9892d ("ext4: add a new
spinlock i_raw_lock to protect the ext4's raw inode")

[   20.909408] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
[   21.932207] BUG: sleeping function called from invalid context at fs/ext4/ext4_jbd2.c:252
[   21.933168] in_atomic(): 1, irqs_disabled(): 0, pid: 3280, name: dd
[   21.933709] CPU: 1 PID: 3280 Comm: dd Not tainted 3.14.0-01910-gdeb73c7 #1
[   21.934278] Hardware name:                  /        , BIOS VVRBLI9J.86A.2891.2007.0511.1144 05/11/2007
[   21.935205]  0000000000000000 ffff88007de99aa8 ffffffff819b8b88 ffff880038f10000
[   21.936226]  ffff88007de99ab8 ffffffff811030c2 ffff88007de99b18 ffffffff812bba58
[   21.937231]  000000000000130c ffffffff812b5e7f ffff88007de99b00 ffffffff812d8046
[   21.938231] Call Trace:
[   21.938627]  [<ffffffff819b8b88>] dump_stack+0x4d/0x66
[   21.939140]  [<ffffffff811030c2>] __might_sleep+0x10a/0x10c
[   21.939656]  [<ffffffff812bba58>] __ext4_handle_dirty_metadata+0x39/0x1b5
[   21.940237]  [<ffffffff812b5e7f>] ? ext4_ext_tree_init+0x32/0x36
[   21.940780]  [<ffffffff812d8046>] ? jbd2_journal_get_write_access+0x33/0x3c
[   21.941362]  [<ffffffff812974e6>] ext4_mark_iloc_dirty+0x577/0x630
[   21.941915]  [<ffffffff812b5e7f>] ? ext4_ext_tree_init+0x32/0x36
[   21.941916]  [<ffffffff812976c7>] ext4_mark_inode_dirty+0xa6/0x1f0
[   21.941920]  [<ffffffff812b5e7f>] ext4_ext_tree_init+0x32/0x36
[   21.941922]  [<ffffffff81292988>] __ext4_new_inode+0xf29/0x10c9
[   21.941925]  [<ffffffff8129f5bb>] ext4_create+0xac/0x156
[   21.941930]  [<ffffffff811e8bdf>] vfs_create+0x68/0xa1
[   21.941932]  [<ffffffff811eaf1b>] do_last.isra.52+0x518/0xa23
[   21.941933]  [<ffffffff811e8db9>] ? link_path_walk+0x69/0x71f
[   21.941935]  [<ffffffff811eb64b>] path_openat+0x225/0x591
[   21.941937]  [<ffffffff811ec7f8>] do_filp_open+0x3a/0x7f
[   21.941939]  [<ffffffff811f72f5>] ? __alloc_fd+0x5e/0xef
[   21.941942]  [<ffffffff811deec2>] do_sys_open+0x147/0x1d6
[   21.941943]  [<ffffffff811f6d7b>] ? __fdget+0x13/0x15
[   21.941945]  [<ffffffff811def6f>] SyS_open+0x1e/0x20
[   21.941947]  [<ffffffff819c7ae9>] system_call_fastpath+0x16/0x1b

Thanks,
Fengguang

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