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BUG: KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue

write to 0xffff888101ddb210 of 8 bytes by task 224 on cpu 1:
 __list_add include/linux/list.h:70 [inline]
 list_add include/linux/list.h:86 [inline]
 blk_mq_request_bypass_insert+0x6a/0x130 block/blk-mq.c:2140
 blk_mq_sched_insert_request+0xfd/0x220 block/blk-mq-sched.c:457
 blk_mq_requeue_work+0x217/0x3e0 block/blk-mq.c:1088
 process_one_work+0x3fc/0x980 kernel/workqueue.c:2298
 worker_thread+0x616/0xa70 kernel/workqueue.c:2445
 kthread+0x2c7/0x2e0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

read to 0xffff888101ddb210 of 8 bytes by task 13380 on cpu 0:
 list_empty_careful include/linux/list.h:319 [inline]
 blk_mq_hctx_has_pending block/blk-mq.c:99 [inline]
 blk_mq_run_hw_queue+0x12e/0x260 block/blk-mq.c:1887
 blk_mq_sched_insert_requests+0x130/0x200 block/blk-mq-sched.c:508
 blk_mq_flush_plug_list+0x372/0x460 block/blk-mq.c:2268
 blk_flush_plug+0x252/0x2b0 block/blk-core.c:1617
 blk_finish_plug+0x44/0x60 block/blk-core.c:1635
 __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+0x21d/0x290 fs/ext4/file.c:128
 call_read_iter include/linux/fs.h:2155 [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+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff888101ddb208 -> 0xffff888102ab70c8

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13380 Comm: syz-executor.0 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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