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BUG: KCSAN: data-race in blk_mq_run_hw_queue / blk_mq_sched_dispatch_requests

read to 0xffff88812a6dd810 of 8 bytes by interrupt on cpu 1:
 list_empty_careful include/linux/list.h:287 [inline]
 blk_mq_hctx_has_pending block/blk-mq.c:69 [inline]
 blk_mq_run_hw_queue+0x10e/0x1c0 block/blk-mq.c:1469
 blk_mq_run_hw_queues+0xac/0xf0 block/blk-mq.c:1486
 scsi_end_request+0x342/0x360 drivers/scsi/scsi_lib.c:616
 scsi_io_completion+0x11d/0xc80 drivers/scsi/scsi_lib.c:960
 scsi_finish_command+0x283/0x380 drivers/scsi/scsi.c:228
 scsi_softirq_done+0x259/0x280 drivers/scsi/scsi_lib.c:1476
 blk_done_softirq+0x1eb/0x250 block/blk-softirq.c:37
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 do_IRQ+0x81/0x130 arch/x86/kernel/irq.c:263
 ret_from_intr+0x0/0x21
 check_kcov_mode kernel/kcov.c:153 [inline]
 __sanitizer_cov_trace_pc+0x1a/0x50 kernel/kcov.c:187
 __read_once_size+0x34/0xe0 include/linux/compiler.h:232
 compound_head include/linux/page-flags.h:174 [inline]
 mark_page_accessed+0x46/0x520 mm/swap.c:375
 follow_page_pte+0x652/0xd20 mm/gup.c:270
 follow_pmd_mask mm/gup.c:415 [inline]
 follow_pud_mask mm/gup.c:460 [inline]
 follow_p4d_mask mm/gup.c:486 [inline]
 follow_page_mask+0x7b0/0x1100 mm/gup.c:545
 __get_user_pages+0x3a0/0x1130 mm/gup.c:849
 populate_vma_page_range+0xe6/0x100 mm/gup.c:1235
 __mm_populate+0x168/0x2a0 mm/gup.c:1283
 mm_populate include/linux/mm.h:2347 [inline]
 __do_sys_mlockall mm/mlock.c:823 [inline]
 __se_sys_mlockall mm/mlock.c:799 [inline]
 __x64_sys_mlockall+0x2e3/0x320 mm/mlock.c:799
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812a6dd810 of 8 bytes by task 2498 on cpu 0:
 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:1368
 __blk_mq_delay_run_hw_queue+0x31b/0x3a0 block/blk-mq.c:1436
 blk_mq_run_hw_queue+0xfd/0x1c0 block/blk-mq.c:1473
 blk_mq_run_hw_queues+0xac/0xf0 block/blk-mq.c:1486
 blk_mq_requeue_work+0x3a9/0x460 block/blk-mq.c:741
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 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: 0 PID: 2498 Comm: kworker/0:1H Not tainted 5.5.0-rc1-syzkaller #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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