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BUG: KCSAN: data-race in io_sq_thread / io_uring_try_cancel_requests

write to 0xffff88810991b278 of 8 bytes by task 933 on cpu 1:
 io_sq_thread+0xaab/0xba0 fs/io_uring.c:6915
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

read to 0xffff88810991b278 of 8 bytes by task 29805 on cpu 0:
 io_uring_try_cancel_requests+0x306/0x880 fs/io_uring.c:8973
 io_ring_exit_work+0x7f/0x1350 fs/io_uring.c:8764
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276
 worker_thread+0x636/0xae0 kernel/workqueue.c:2422
 kthread+0x262/0x280 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

value changed: 0xffff888108b30000 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 29805 Comm: kworker/u4:8 Tainted: G        W         5.14.0-rc1-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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