================================================================== BUG: KCSAN: data-race in dd_has_work / deadline_remove_request write to 0xffff888128ae0f28 of 8 bytes by task 3256 on cpu 0: __list_del include/linux/list.h:112 [inline] __list_del_entry include/linux/list.h:135 [inline] list_del_init include/linux/list.h:204 [inline] deadline_remove_request+0x6a/0x180 block/mq-deadline.c:113 deadline_move_request block/mq-deadline.c:176 [inline] __dd_dispatch_request block/mq-deadline.c:365 [inline] dd_dispatch_request+0x6d2/0x740 block/mq-deadline.c:387 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:161 [inline] blk_mq_do_dispatch_sched+0x1df/0x610 block/blk-mq-sched.c:214 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:325 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:356 __blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1534 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:1812 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff888128ae0f28 of 8 bytes by task 5039 on cpu 1: list_empty_careful include/linux/list.h:319 [inline] dd_has_work+0xd3/0xe0 block/mq-deadline.c:584 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:150 [inline] blk_mq_do_dispatch_sched+0x138/0x610 block/blk-mq-sched.c:214 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:325 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:356 __blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1534 __blk_mq_delay_run_hw_queue+0x199/0x340 block/blk-mq.c:1611 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1664 blk_mq_run_hw_queues block/blk-mq.c:1682 [inline] blk_mq_requeue_work+0x423/0x490 block/blk-mq.c:816 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 5039 Comm: kworker/1:1H Not tainted 5.9.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_requeue_work ==================================================================