==================================================================
BUG: KCSAN: data-race in dd_has_work / deadline_remove_request

write to 0xffff888101c73898 of 8 bytes by task 17803 on cpu 1:
 __list_del include/linux/list.h:114 [inline]
 __list_del_entry include/linux/list.h:137 [inline]
 list_del_init include/linux/list.h:206 [inline]
 deadline_remove_request+0x58/0x190 block/mq-deadline.c:173
 deadline_move_request block/mq-deadline.c:249 [inline]
 __dd_dispatch_request+0x422/0x4d0 block/mq-deadline.c:465
 dd_dispatch_request+0x1d0/0x2b0 block/mq-deadline.c:531
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:147 [inline]
 blk_mq_do_dispatch_sched+0x1e7/0x6d0 block/blk-mq-sched.c:212
 __blk_mq_sched_dispatch_requests+0x1ca/0x270
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:358
 __blk_mq_run_hw_queue+0xc1/0x140 block/blk-mq.c:1785
 __blk_mq_delay_run_hw_queue+0x199/0x360 block/blk-mq.c:1862
 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1915
 blk_mq_sched_insert_requests+0x130/0x200 block/blk-mq-sched.c:511
 blk_mq_flush_plug_list+0x372/0x460 block/blk-mq.c:2292
 blk_flush_plug+0x25a/0x2b0 block/blk-core.c:1593
 blk_finish_plug+0x44/0x60 block/blk-core.c:1617
 ext4_writepages+0x1581/0x1a50 fs/ext4/inode.c:2846
 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364
 filemap_fdatawrite_wbc mm/filemap.c:407 [inline]
 __filemap_fdatawrite_range mm/filemap.c:440 [inline]
 filemap_write_and_wait_range+0x1b2/0x340 mm/filemap.c:718
 __iomap_dio_rw+0x4bb/0x1070 fs/iomap/direct-io.c:560
 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:679
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x190/0x1f0 fs/ext4/file.c:128
 call_read_iter include/linux/fs.h:2156 [inline]
 generic_file_splice_read+0x24f/0x330 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888101c73898 of 8 bytes by task 17795 on cpu 0:
 list_empty_careful include/linux/list.h:321 [inline]
 dd_has_work_for_prio block/mq-deadline.c:837 [inline]
 dd_has_work+0x188/0x260 block/mq-deadline.c:846
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:135 [inline]
 blk_mq_do_dispatch_sched+0x12a/0x6d0 block/blk-mq-sched.c:212
 __blk_mq_sched_dispatch_requests+0x1ca/0x270
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:358
 __blk_mq_run_hw_queue+0xc1/0x140 block/blk-mq.c:1785
 __blk_mq_delay_run_hw_queue+0x199/0x360 block/blk-mq.c:1862
 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1915
 blk_mq_sched_insert_requests+0x130/0x200 block/blk-mq-sched.c:511
 blk_mq_flush_plug_list+0x372/0x460 block/blk-mq.c:2292
 blk_flush_plug+0x25a/0x2b0 block/blk-core.c:1593
 blk_finish_plug+0x44/0x60 block/blk-core.c:1617
 __iomap_dio_rw+0xcad/0x1070 fs/iomap/direct-io.c:597
 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:679
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x190/0x1f0 fs/ext4/file.c:128
 call_read_iter include/linux/fs.h:2156 [inline]
 generic_file_splice_read+0x24f/0x330 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff88810293e748 -> 0xffff888101c73890

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17795 Comm: syz-executor.0 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================