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BUG: KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list

read to 0xffff888100fd56f8 of 4 bytes by task 23 on cpu 1:
 blk_mq_update_dispatch_busy block/blk-mq.c:1919 [inline]
 blk_mq_dispatch_rq_list+0xf38/0x10a0 block/blk-mq.c:2166
 __blk_mq_sched_dispatch_requests+0x1ce/0xd20 block/blk-mq-sched.c:301
 blk_mq_sched_dispatch_requests+0x78/0xe0 block/blk-mq-sched.c:331
 blk_mq_run_hw_queue+0x298/0x4c0 block/blk-mq.c:2285
 blk_mq_run_hw_queues+0x15b/0x1e0 block/blk-mq.c:2334
 blk_mq_requeue_work+0x408/0x430 block/blk-mq.c:1503
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa40 kernel/workqueue.c:2706
 worker_thread+0x525/0x730 kernel/workqueue.c:2787
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

write to 0xffff888100fd56f8 of 4 bytes by task 13581 on cpu 0:
 blk_mq_dispatch_rq_list+0xf55/0x10a0
 __blk_mq_sched_dispatch_requests+0x1ce/0xd20 block/blk-mq-sched.c:301
 blk_mq_sched_dispatch_requests+0x78/0xe0 block/blk-mq-sched.c:331
 blk_mq_run_hw_queue+0x298/0x4c0 block/blk-mq.c:2285
 blk_execute_rq+0x13a/0x3d0 block/blk-mq.c:1410
 sg_scsi_ioctl drivers/scsi/scsi_ioctl.c:593 [inline]
 scsi_ioctl+0x13fd/0x1530 drivers/scsi/scsi_ioctl.c:901
 sg_ioctl_common drivers/scsi/sg.c:1106 [inline]
 sg_ioctl+0xda6/0x1870 drivers/scsi/sg.c:1160
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:857
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13581 Comm: syz-executor.0 Not tainted 6.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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