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BUG: KCSAN: data-race in create_io_worker / io_wqe_enqueue

write to 0xffff888039796044 of 4 bytes by task 32748 on cpu 0:
 create_io_worker+0x35d/0x380 fs/io-wq.c:607
 io_wq_check_workers+0x2a0/0x310 fs/io-wq.c:676
 io_wq_manager+0xbc/0x640 fs/io-wq.c:713
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff888039796044 of 4 bytes by task 32747 on cpu 1:
 io_wqe_wake_worker fs/io-wq.c:253 [inline]
 io_wqe_enqueue+0x424/0x4f0 fs/io-wq.c:817
 io_wq_enqueue+0x3a/0x40 fs/io-wq.c:824
 io_queue_async_work+0x178/0x3a0 fs/io_uring.c:1246
 __io_queue_sqe+0x407/0x4e0 fs/io_uring.c:6315
 io_queue_sqe+0x6d/0x160 fs/io_uring.c:6356
 io_submit_sqe+0x15a8/0x3140 fs/io_uring.c:6527
 io_submit_sqes+0x609/0xab0 fs/io_uring.c:6641
 __do_sys_io_uring_enter fs/io_uring.c:9187 [inline]
 __se_sys_io_uring_enter+0x21f/0xb10 fs/io_uring.c:9129
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9129
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 32747 Comm: syz-executor.4 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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