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BUG: KCSAN: data-race in io_ring_exit_work / io_sq_thread

write to 0xffff8881018d99f8 of 8 bytes by task 24868 on cpu 0:
 io_sq_thread+0xe3e/0xf80 fs/io_uring.c:6837
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff8881018d99f8 of 8 bytes by task 8 on cpu 1:
 io_sq_thread_park fs/io_uring.c:7160 [inline]
 io_ring_exit_work+0x6f/0xc50 fs/io_uring.c:8581
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2275
 worker_thread+0x636/0xae0 kernel/workqueue.c:2421
 kthread+0x1d0/0x1f0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.12.0-rc7-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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