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BUG: KCSAN: data-race in io_ring_exit_work / io_sq_thread

write to 0xffff88811e9c3938 of 8 bytes by task 23831 on cpu 0:
 io_sq_thread+0xb48/0xc40 fs/io_uring.c:7417
 ret_from_fork+0x1f/0x30

read to 0xffff88811e9c3938 of 8 bytes by task 30768 on cpu 1:
 io_sq_thread_park fs/io_uring.c:7841 [inline]
 io_ring_exit_work+0xc5/0x13a0 fs/io_uring.c:9298
 process_one_work+0x402/0x910 kernel/workqueue.c:2297
 worker_thread+0x636/0xae0 kernel/workqueue.c:2444
 kthread+0x262/0x280 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30

value changed: 0xffff88810a767040 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 30768 Comm: kworker/u4:9 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound io_ring_exit_work
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