syzbot

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BUG: KCSAN: data-race in create_io_worker / io_wqe_enqueue

write to 0xffff88812df5dc44 of 4 bytes by task 22842 on cpu 0:
 create_io_worker+0x368/0x3c0 fs/io-wq.c:617
 io_wq_check_workers+0x2bd/0x340 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 0xffff88812df5dc44 of 4 bytes by task 22838 on cpu 1:
 io_wqe_wake_worker fs/io-wq.c:252 [inline]
 io_wqe_enqueue+0x414/0x4d0 fs/io-wq.c:831
 io_wq_enqueue+0x3a/0x40 fs/io-wq.c:838
 io_queue_async_work+0x174/0x230 fs/io_uring.c:1246
 __io_queue_sqe+0x2fe/0x3a0 fs/io_uring.c:6334
 io_queue_sqe+0x6d/0x160 fs/io_uring.c:6375
 io_submit_sqe+0x15c7/0x30c0 fs/io_uring.c:6546
 io_submit_sqes+0x61f/0xaf0 fs/io_uring.c:6660
 __do_sys_io_uring_enter fs/io_uring.c:9240 [inline]
 __se_sys_io_uring_enter+0x217/0xb20 fs/io_uring.c:9182
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9182
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22838 Comm: syz-executor.4 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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