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BUG: KCSAN: data-race in io_wqe_enqueue / io_wqe_worker

write to 0xffff88813a225184 of 4 bytes by task 32016 on cpu 0:
 io_wqe_worker+0x74/0x5a0 fs/io-wq.c:560
 ret_from_fork+0x1f/0x30

read to 0xffff88813a225184 of 4 bytes by task 32015 on cpu 1:
 io_wqe_get_acct fs/io-wq.c:167 [inline]
 io_wqe_activate_free_worker fs/io-wq.c:229 [inline]
 io_wqe_enqueue+0x34e/0x740 fs/io-wq.c:857
 io_wq_enqueue+0x31/0x40 fs/io-wq.c:883
 io_queue_async_work+0x13a/0x320 fs/io_uring.c:1473
 __io_queue_sqe+0x422/0x460 fs/io_uring.c:6933
 io_req_task_submit fs/io_uring.c:2233 [inline]
 io_async_task_func+0x3a3/0x4b0 fs/io_uring.c:5462
 tctx_task_work+0x275/0x4d0 fs/io_uring.c:2158
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:212 [inline]
 handle_signal_work kernel/entry/common.c:146 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0xf8/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000004 -> 0x00000007

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 32015 Comm: syz-executor.1 Tainted: G        W         5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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