syzbot

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BUG: KCSAN: data-race in create_io_worker / io_wqe_wake_worker

write to 0xffff888034737c44 of 4 bytes by task 22077 on cpu 1:
 create_io_worker+0x2cb/0x3a0 fs/io-wq.c:706
 io_wq_manager+0x376/0x7b0 fs/io-wq.c:799
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff888034737c44 of 4 bytes by task 22076 on cpu 0:
 io_wqe_wake_worker+0x163/0x220 fs/io-wq.c:307
 io_wqe_enqueue+0x2b7/0x360 fs/io-wq.c:906
 io_wq_enqueue+0x3a/0x40 fs/io-wq.c:913
 __io_queue_async_work+0x117/0x1f0 fs/io_uring.c:1582
 io_queue_async_work fs/io_uring.c:1592 [inline]
 __io_queue_sqe+0x5ee/0xa70 fs/io_uring.c:6584
 io_queue_sqe+0x1c0/0x420 fs/io_uring.c:6638
 io_submit_sqe+0x33e/0x620 fs/io_uring.c:6711
 io_submit_sqes+0xa8c/0x12a0 fs/io_uring.c:6959
 __do_sys_io_uring_enter fs/io_uring.c:9361 [inline]
 __se_sys_io_uring_enter+0x21f/0xb70 fs/io_uring.c:9304
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22076 Comm: syz-executor.2 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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