$ dmesg | tail
[  956.916793]  check_preemption_disabled+0xbb/0xd0
[  956.916797]  blk_mq_complete_request_remote+0x42/0x90
[  956.916800]  blk_mq_complete_request+0x9/0x30
[  956.916803]  loop_queue_work+0x213/0x9e5 [loop]
[  956.916809]  ? finish_task_switch+0x8c/0x3e0
[  956.916813]  ? loop_info64_to_compat+0x220/0x220 [loop]
[  956.916817]  kthread_worker_fn+0xa6/0x1b0
[  956.916820]  kthread+0x153/0x170
[  956.916822]  ? kthread_park+0x80/0x80
[  956.916825]  ret_from_fork+0x22/0x30


dmesg |grep sda
nothing