syzbot

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BUG: KCSAN: data-race in io_wqe_activate_free_worker / io_wqe_worker

write to 0xffff888143622a84 of 4 bytes by task 2169 on cpu 1:
 io_wqe_worker+0xa2/0x8a0 io_uring/io-wq.c:622
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff888143622a84 of 4 bytes by task 1982 on cpu 0:
 io_wqe_get_acct io_uring/io-wq.c:175 [inline]
 io_wqe_activate_free_worker+0xf4/0x270 io_uring/io-wq.c:274
 io_wqe_enqueue+0x268/0x470 io_uring/io-wq.c:933
 io_wq_enqueue+0x35/0x40 io_uring/io-wq.c:966
 io_queue_iowq+0x1d1/0x310 io_uring/io_uring.c:475
 io_queue_sqe_fallback+0x82/0xe0 io_uring/io_uring.c:2113
 io_submit_sqe io_uring/io_uring.c:2335 [inline]
 io_submit_sqes+0xbf8/0xfe0 io_uring/io_uring.c:2450
 __do_sys_io_uring_enter io_uring/io_uring.c:3458 [inline]
 __se_sys_io_uring_enter+0x1e5/0x1b70 io_uring/io_uring.c:3392
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3392
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000004 -> 0x00000003

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1982 Comm: syz-executor.2 Not tainted 6.3.0-syzkaller-05127-g5c7ecada25d2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
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