syzbot

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BUG: KCSAN: data-race in create_io_worker / io_wqe_wake_worker

write to 0xffff888046dc4044 of 4 bytes by task 12794 on cpu 1:
 create_io_worker+0x2cb/0x3a0 fs/io-wq.c:713
 io_wq_manager+0x350/0x790 fs/io-wq.c:812
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff888046dc4044 of 4 bytes by task 12805 on cpu 0:
 io_wqe_wake_worker+0x163/0x220 fs/io-wq.c:308
 io_wqe_enqueue+0x2a5/0x320 fs/io-wq.c:919
 io_wq_enqueue+0x3a/0x40 fs/io-wq.c:926
 __io_queue_async_work fs/io_uring.c:1433 [inline]
 __io_queue_deferred+0x206/0x570 fs/io_uring.c:1507
 io_commit_cqring+0x457/0x460 fs/io_uring.c:1540
 io_cqring_add_event fs/io_uring.c:1739 [inline]
 __io_req_complete+0xe5/0x450 fs/io_uring.c:1782
 io_issue_sqe+0x2f94/0x45e0 fs/io_uring.c:4260
 io_wq_submit_work+0x27c/0x760 fs/io_uring.c:6064
 io_worker_handle_work+0xd2a/0x1000 fs/io-wq.c:572
 io_wqe_worker+0x202/0x810 fs/io-wq.c:614
 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: 0 PID: 12805 Comm: io_wqe_worker-0 Not tainted 5.10.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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