[<0>] rq_qos_wait+0xbd/0x140
[<0>] wbt_wait+0x9c/0x100
[<0>] __rq_qos_throttle+0x23/0x40
[<0>] blk_mq_submit_bio+0x20b/0x790
[<0>] __submit_bio+0xa5/0x240
[<0>] submit_bio_noacct_nocheck+0x16e/0x250
[<0>] iomap_submit_ioend+0x4e/0x80
[<0>] xfs_vm_writepages+0x62/0x90 [xfs]
[<0>] do_writepages+0xd5/0x1b0
[<0>] filemap_fdatawrite_wbc+0x66/0x90
[<0>] __filemap_fdatawrite_range+0x54/0x80
[<0>] file_write_and_wait_range+0x45/0xb0
[<0>] xfs_file_fsync+0x5a/0x240 [xfs]
[<0>] loop_process_work+0x296/0x3d0 [loop]
[<0>] process_one_work+0x196/0x380
[<0>] worker_thread+0x281/0x3a0
[<0>] kthread+0x104/0x110
[<0>] ret_from_fork+0x2b/0x50
