[<0>] wait_on_page_bit+0x15c/0x230
[<0>] __filemap_fdatawait_range+0x89/0xf0
[<0>] filemap_fdatawait_range+0xe/0x20
[<0>] __btrfs_wait_marked_extents.isra.19+0xc2/0x100 [btrfs]
[<0>] btrfs_write_and_wait_transaction.isra.23+0x67/0xd0 [btrfs]
[<0>] btrfs_commit_transaction+0x755/0xa50 [btrfs]
[<0>] transaction_kthread+0x144/0x170 [btrfs]
[<0>] kthread+0x112/0x130
[<0>] ret_from_fork+0x22/0x40