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BUG: KCSAN: data-race in blk_mq_run_hw_queue / blk_mq_sched_insert_request

read to 0xffff888129983410 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+0x11a/0x1c0 block/blk-mq.c:1504
 blk_mq_run_hw_queues+0xac/0xf0 block/blk-mq.c:1525
 scsi_end_request+0x3bd/0x3e0 drivers/scsi/scsi_lib.c:619
 scsi_io_completion+0x11d/0xc80 drivers/scsi/scsi_lib.c:963
 scsi_finish_command+0x280/0x380 drivers/scsi/scsi.c:228
 scsi_softirq_done+0x259/0x280 drivers/scsi/scsi_lib.c:1477
 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+0x0/0x19
 __read_once_size+0x88/0x110 include/linux/compiler.h:229
 list_empty include/linux/list.h:268 [inline]
 free_buffer_head+0x41/0xf0 fs/buffer.c:3382
 try_to_free_buffers+0x1a4/0x2b0 fs/buffer.c:3298
 try_to_release_page+0x188/0x1c0 mm/filemap.c:3502
 invalidate_complete_page mm/truncate.c:212 [inline]
 invalidate_inode_page+0x1a6/0x200 mm/truncate.c:264
 invalidate_mapping_pages+0x377/0x900 mm/truncate.c:607
 generic_fadvise+0x2fb/0x4b0 mm/fadvise.c:159
 vfs_fadvise+0x92/0xa0 mm/fadvise.c:187
 ksys_fadvise64_64+0x61/0xa0 mm/fadvise.c:201
 __do_sys_fadvise64 mm/fadvise.c:216 [inline]
 __se_sys_fadvise64 mm/fadvise.c:214 [inline]
 __x64_sys_fadvise64+0x5e/0x80 mm/fadvise.c:214
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888129983410 of 8 bytes by task 2503 on cpu 0:
 __list_add include/linux/list.h:63 [inline]
 list_add include/linux/list.h:79 [inline]
 blk_mq_sched_bypass_insert block/blk-mq-sched.c:367 [inline]
 blk_mq_sched_insert_request+0x2fd/0x3f0 block/blk-mq-sched.c:394
 blk_mq_requeue_work+0x370/0x460 block/blk-mq.c:772
 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: 0 PID: 2503 Comm: kworker/0:1H Not tainted 5.4.0-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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