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BUG: KCSAN: data-race in create_io_worker / io_wqe_enqueue

write to 0xffff88810299f844 of 4 bytes by task 10769 on cpu 1:
 create_io_worker+0x35d/0x380 fs/io-wq.c:617
 io_wq_check_workers+0x2a0/0x310 fs/io-wq.c:686
 io_wq_manager+0xc7/0x630 fs/io-wq.c:723
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88810299f844 of 4 bytes by task 10768 on cpu 0:
 io_wqe_wake_worker fs/io-wq.c:252 [inline]
 io_wqe_enqueue+0x424/0x4f0 fs/io-wq.c:831
 io_wq_enqueue+0x3a/0x40 fs/io-wq.c:838
 io_queue_async_work+0x178/0x3a0 fs/io_uring.c:1246
 __io_queue_sqe+0x407/0x4e0 fs/io_uring.c:6334
 io_queue_sqe+0x6d/0x160 fs/io_uring.c:6375
 io_submit_sqe+0x15c7/0x3130 fs/io_uring.c:6546
 io_submit_sqes+0x609/0xab0 fs/io_uring.c:6660
 __do_sys_io_uring_enter fs/io_uring.c:9237 [inline]
 __se_sys_io_uring_enter+0x21f/0xb10 fs/io_uring.c:9179
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9179
 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: 0 PID: 10768 Comm: syz-executor.0 Tainted: G        W         5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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