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BUG: KCSAN: data-race in create_io_worker / io_wqe_wake_worker

write to 0xffff88800a9ce844 of 4 bytes by task 19265 on cpu 0:
 create_io_worker+0x2cb/0x3a0 fs/io-wq.c:706
 io_wq_manager+0x350/0x790 fs/io-wq.c:799
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88800a9ce844 of 4 bytes by task 19272 on cpu 1:
 io_wqe_wake_worker+0x163/0x220 fs/io-wq.c:307
 io_wqe_enqueue+0x2bb/0x330 fs/io-wq.c:906
 io_wq_enqueue+0x3a/0x40 fs/io-wq.c:913
 __io_queue_async_work fs/io_uring.c:1562 [inline]
 __io_queue_deferred+0x1f3/0x550 fs/io_uring.c:1624
 io_commit_cqring+0x457/0x460 fs/io_uring.c:1657
 io_cqring_add_event fs/io_uring.c:1819 [inline]
 __io_req_complete+0xe0/0x1a0 fs/io_uring.c:1862
 io_issue_sqe+0x1f91/0x3f20 fs/io_uring.c:1192
 io_wq_submit_work+0x24c/0x4a0 fs/io_uring.c:6322
 io_worker_handle_work+0xd08/0x1070 fs/io-wq.c:565
 io_wqe_worker+0x211/0x880 fs/io-wq.c:607
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19272 Comm: io_wqe_worker-0 Not tainted 5.11.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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