root@noisy:/proc/1974/task# cat 2043/stack
[<ffffffffa033fc3a>] btrfs_commit_transaction_async+0x25a/0x2e0 [btrfs]
[<ffffffffa036e48e>] btrfs_mksubvol+0x2ae/0x350 [btrfs]
[<ffffffffa036e62a>] btrfs_ioctl_snap_create_transid+0xfa/0x150 [btrfs]
[<ffffffffa036e709>] btrfs_ioctl_snap_create_v2+0x89/0x100 [btrfs]
[<ffffffffa0371692>] btrfs_ioctl+0x762/0xa90 [btrfs]
[<ffffffff8116de1d>] vfs_ioctl+0x1d/0x50
[<ffffffff8116e8b9>] do_vfs_ioctl+0x69/0x1d0
[<ffffffff8116eab4>] sys_ioctl+0x94/0xa0
[<ffffffff8100c002>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
root@noisy:/proc/1974/task#