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BUG: KCSAN: data-race in dd_has_work / deadline_remove_request

write to 0xffff88812b3e9c18 of 8 bytes by task 31002 on cpu 1:
 __list_del include/linux/list.h:112 [inline]
 __list_del_entry include/linux/list.h:135 [inline]
 __list_del_entry include/linux/list.h:130 [inline]
 list_del_init include/linux/list.h:204 [inline]
 deadline_remove_request+0x143/0x250 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+0x41b/0x4f0 block/mq-deadline.c:387
 blk_mq_do_dispatch_sched+0x1f2/0x270 block/blk-mq-sched.c:103
 blk_mq_sched_dispatch_requests+0x2b6/0x380 block/blk-mq-sched.c:211
 __blk_mq_run_hw_queue+0xb1/0x150 block/blk-mq.c:1389
 __blk_mq_delay_run_hw_queue+0x315/0x390 block/blk-mq.c:1466
 blk_mq_run_hw_queue+0xfa/0x1b0 block/blk-mq.c:1519
 blk_mq_sched_insert_requests+0x19c/0x270 block/blk-mq-sched.c:474
 blk_mq_flush_plug_list+0x2f0/0x4c0 block/blk-mq.c:1769
 blk_flush_plug_list+0x281/0x2b0 block/blk-core.c:1760
 blk_finish_plug block/blk-core.c:1777 [inline]
 blk_finish_plug+0x59/0x7a block/blk-core.c:1773
 read_pages+0xbc/0x360 mm/readahead.c:142
 __do_page_cache_readahead+0x2be/0x380 mm/readahead.c:190
 force_page_cache_readahead+0x12c/0x1e0 mm/readahead.c:243
 page_cache_sync_readahead+0x1d1/0x1e0 mm/readahead.c:522
 generic_file_buffered_read mm/filemap.c:2036 [inline]
 generic_file_read_iter+0xf24/0x18c0 mm/filemap.c:2309
 blkdev_read_iter+0xae/0xe0 fs/block_dev.c:2053
 call_read_iter include/linux/fs.h:1901 [inline]
 new_sync_read+0x306/0x450 fs/read_write.c:415
 __vfs_read+0x9e/0xb0 fs/read_write.c:428
 vfs_read fs/read_write.c:462 [inline]
 vfs_read+0x13e/0x2b0 fs/read_write.c:447
 ksys_read+0xc5/0x1a0 fs/read_write.c:588
 __do_sys_read fs/read_write.c:598 [inline]
 __se_sys_read fs/read_write.c:596 [inline]
 __x64_sys_read+0x49/0x60 fs/read_write.c:596
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812b3e9c18 of 8 bytes by task 31264 on cpu 0:
 list_empty_careful include/linux/list.h:301 [inline]
 dd_has_work+0xb0/0xf0 block/mq-deadline.c:583
 blk_mq_do_dispatch_sched+0x171/0x270 block/blk-mq-sched.c:97
 blk_mq_sched_dispatch_requests+0x2b6/0x380 block/blk-mq-sched.c:211
 __blk_mq_run_hw_queue+0xb1/0x150 block/blk-mq.c:1389
 __blk_mq_delay_run_hw_queue+0x315/0x390 block/blk-mq.c:1466
 blk_mq_run_hw_queue+0xfa/0x1b0 block/blk-mq.c:1519
 blk_mq_sched_insert_requests+0x19c/0x270 block/blk-mq-sched.c:474
 blk_mq_flush_plug_list+0x2f0/0x4c0 block/blk-mq.c:1769
 blk_flush_plug_list+0x281/0x2b0 block/blk-core.c:1760
 blk_finish_plug block/blk-core.c:1777 [inline]
 blk_finish_plug+0x59/0x7a block/blk-core.c:1773
 mpage_writepages+0x136/0x180 fs/mpage.c:737
 fat_writepages+0x2a/0x40 fs/fat/inode.c:205
 do_writepages+0x6b/0x170 mm/page-writeback.c:2344
 __filemap_fdatawrite_range+0x1bb/0x220 mm/filemap.c:421
 filemap_write_and_wait_range mm/filemap.c:654 [inline]
 filemap_write_and_wait_range+0xad/0x140 mm/filemap.c:648
 __generic_file_write_iter+0x30a/0x370 mm/filemap.c:3417
 generic_file_write_iter+0x294/0x38e mm/filemap.c:3463
 call_write_iter include/linux/fs.h:1907 [inline]
 do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:694
 do_iter_write fs/read_write.c:999 [inline]
 do_iter_write+0x137/0x3a0 fs/read_write.c:980
 vfs_iter_write+0x56/0x80 fs/read_write.c:1040
 iter_file_splice_write+0x530/0x830 fs/splice.c:760
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x97/0xb0 fs/splice.c:1037
 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992
 do_splice_direct+0x152/0x1d0 fs/splice.c:1080
 do_sendfile+0x380/0x800 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1582 [inline]
 __se_sys_sendfile64 fs/read_write.c:1568 [inline]
 __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1568
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 31264 Comm: syz-executor.2 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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