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BUG: KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list

read to 0xffff888101e272f8 of 4 bytes by task 21 on cpu 1:
 blk_mq_update_dispatch_busy block/blk-mq.c:1748 [inline]
 blk_mq_dispatch_rq_list+0xe6b/0x1250 block/blk-mq.c:2001
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:173 [inline]
 blk_mq_do_dispatch_sched+0x49d/0x7f0 block/blk-mq-sched.c:187
 __blk_mq_sched_dispatch_requests+0x1cd/0x270
 blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:339
 __blk_mq_run_hw_queue+0x7e/0x100 block/blk-mq.c:2020
 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:2319
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

write to 0xffff888101e272f8 of 4 bytes by task 20615 on cpu 0:
 blk_mq_update_dispatch_busy block/blk-mq.c:1758 [inline]
 blk_mq_dispatch_rq_list+0x1131/0x1250 block/blk-mq.c:1998
 __blk_mq_sched_dispatch_requests+0x1b7/0x270 block/blk-mq-sched.c:306
 blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:339
 __blk_mq_run_hw_queue+0x7e/0x100 block/blk-mq.c:2020
 __blk_mq_delay_run_hw_queue+0x15b/0x370 block/blk-mq.c:2096
 blk_mq_run_hw_queue+0x180/0x320 block/blk-mq.c:2144
 blk_mq_sched_insert_requests+0x1cb/0x2a0 block/blk-mq-sched.c:493
 blk_mq_dispatch_plug_list+0x1e9/0x2c0 block/blk-mq.c:2604
 blk_mq_flush_plug_list+0x2ea/0x340 block/blk-mq.c:2646
 blk_add_rq_to_plug+0x13f/0x390 block/blk-mq.c:1185
 blk_mq_submit_bio+0x90b/0xe90 block/blk-mq.c:2837
 __submit_bio block/blk-core.c:595 [inline]
 __submit_bio_noacct_mq block/blk-core.c:672 [inline]
 submit_bio_noacct_nocheck+0x83d/0xaa0 block/blk-core.c:689
 submit_bio_noacct+0x696/0x800 block/blk-core.c:796
 submit_bio+0xfb/0x110
 iomap_dio_submit_bio fs/iomap/direct-io.c:77 [inline]
 iomap_dio_bio_iter+0xa4d/0xc00 fs/iomap/direct-io.c:361
 __iomap_dio_rw+0x981/0x1000 fs/iomap/direct-io.c:602
 iomap_dio_rw+0x3c/0x80 fs/iomap/direct-io.c:690
 ext4_dio_write_iter fs/ext4/file.c:566 [inline]
 ext4_file_write_iter+0xaa9/0x1210 fs/ext4/file.c:677
 call_write_iter include/linux/fs.h:2187 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x468/0x760 fs/read_write.c:584
 ksys_write+0xe8/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000009 -> 0x00000007

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20615 Comm: syz-executor.3 Not tainted 6.0.0-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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