syzbot

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BUG: KCSAN: data-race in __io_cqring_fill_event / io_wake_function

write to 0xffff888136999200 of 4 bytes by task 30407 on cpu 0:
 io_get_cqe fs/io_uring.c:1695 [inline]
 __io_cqring_fill_event+0xf9/0x380 fs/io_uring.c:1873
 io_req_complete_post+0x4b/0x5d0 fs/io_uring.c:1896
 io_issue_sqe+0x4c0e/0x53b0
 io_wq_submit_work+0x1c5/0x370 fs/io_uring.c:6840
 io_worker_handle_work+0x4ca/0xbd0 fs/io-wq.c:576
 io_wqe_worker+0x1bc/0x4f0 fs/io-wq.c:632
 ret_from_fork+0x1f/0x30

read to 0xffff888136999200 of 4 bytes by task 30411 on cpu 1:
 io_should_wake fs/io_uring.c:7577 [inline]
 io_wake_function+0x36/0x100 fs/io_uring.c:7597
 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:108
 __wake_up_common_lock kernel/sched/wait.c:138 [inline]
 __wake_up+0x80/0xc0 kernel/sched/wait.c:157
 io_cqring_ev_posted fs/io_uring.c:1723 [inline]
 io_req_complete_post+0x2e4/0x5d0 fs/io_uring.c:1918
 io_issue_sqe+0x4c0e/0x53b0
 io_wq_submit_work+0x1c5/0x370 fs/io_uring.c:6840
 io_worker_handle_work+0x4ca/0xbd0 fs/io-wq.c:576
 io_wqe_worker+0x1bc/0x4f0 fs/io-wq.c:632
 ret_from_fork+0x1f/0x30

value changed: 0x000001cf -> 0x000001d0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 30411 Comm: iou-wrk-30396 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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