syzbot

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BUG: KCSAN: data-race in io_worker_handle_work / io_wqe_wake_worker

read-write to 0xffff88810e773444 of 4 bytes by task 8533 on cpu 0:
 __io_worker_busy fs/io-wq.c:367 [inline]
 io_worker_handle_work+0x4fd/0x1000 fs/io-wq.c:548
 io_wqe_worker+0x202/0x810 fs/io-wq.c:614
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88810e773444 of 4 bytes by task 8506 on cpu 1:
 io_wqe_wake_worker+0x163/0x220 fs/io-wq.c:308
 io_wqe_enqueue+0x2a5/0x320 fs/io-wq.c:919
 io_wq_enqueue+0x3a/0x40 fs/io-wq.c:926
 __io_queue_async_work fs/io_uring.c:1432 [inline]
 io_queue_async_work+0x189/0x660 fs/io_uring.c:1442
 __io_queue_sqe+0xac4/0x1160 fs/io_uring.c:6244
 io_queue_sqe+0x1e2/0x580 fs/io_uring.c:6298
 io_submit_sqe+0x385/0x8f0 fs/io_uring.c:6367
 io_submit_sqes+0x9a8/0x1720 fs/io_uring.c:6596
 __do_sys_io_uring_enter fs/io_uring.c:8983 [inline]
 __se_sys_io_uring_enter+0x52c/0xac0 fs/io_uring.c:8932
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:8932
 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: 1 PID: 8506 Comm: syz-executor.0 Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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