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BUG: KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests

read to 0xffff88812a3da810 of 8 bytes by task 2498 on cpu 0:
 list_empty_careful include/linux/list.h:287 [inline]
 blk_mq_sched_dispatch_requests+0x33f/0x380 block/blk-mq-sched.c:187
 __blk_mq_run_hw_queue+0xb7/0x160 block/blk-mq.c:1403
 blk_mq_run_work_fn+0x57/0x70 block/blk-mq.c:1636
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269
 worker_thread+0xa0/0x800 kernel/workqueue.c:2415
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

write to 0xffff88812a3da810 of 8 bytes by task 2497 on cpu 1:
 INIT_LIST_HEAD include/linux/list.h:29 [inline]
 list_splice_init include/linux/list.h:451 [inline]
 blk_mq_sched_dispatch_requests+0x239/0x380 block/blk-mq-sched.c:190
 __blk_mq_run_hw_queue+0xb7/0x160 block/blk-mq.c:1403
 __blk_mq_delay_run_hw_queue+0x31b/0x3a0 block/blk-mq.c:1471
 blk_mq_run_hw_queue+0x103/0x1c0 block/blk-mq.c:1508
 blk_mq_run_hw_queues+0xac/0xf0 block/blk-mq.c:1525
 blk_mq_requeue_work+0x3a9/0x460 block/blk-mq.c:775
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269
 worker_thread+0xa0/0x800 kernel/workqueue.c:2415
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2497 Comm: kworker/1:1H Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: kblockd blk_mq_requeue_work
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