syzbot

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BUG: KCSAN: data-race in io_wq_worker_running / io_wqe_activate_free_worker

write to 0xffff88814359b484 of 4 bytes by task 4792 on cpu 0:
 io_wq_worker_running+0x60/0xa0 io_uring/io-wq.c:678
 schedule_timeout+0xc1/0x290 kernel/time/timer.c:1935
 io_wqe_worker+0x3ab/0x8f0 io_uring/io-wq.c:647
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

read to 0xffff88814359b484 of 4 bytes by task 4791 on cpu 1:
 io_wqe_get_acct io_uring/io-wq.c:175 [inline]
 io_wqe_activate_free_worker+0xf8/0x2b0 io_uring/io-wq.c:274
 io_wqe_enqueue+0x2f0/0x500 io_uring/io-wq.c:927
 io_wq_enqueue+0x31/0x40 io_uring/io-wq.c:960
 io_queue_iowq+0x1d2/0x2f0 io_uring/io_uring.c:461
 io_queue_sqe_fallback+0x82/0xe0 io_uring/io_uring.c:1786
 io_submit_sqe+0x8ba/0xa40 io_uring/io_uring.c:2008
 io_submit_sqes+0x274/0x530 io_uring/io_uring.c:2124
 __do_sys_io_uring_enter io_uring/io_uring.c:3057 [inline]
 __se_sys_io_uring_enter+0x254/0xa50 io_uring/io_uring.c:2987
 __x64_sys_io_uring_enter+0x74/0x80 io_uring/io_uring.c:2987
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000d -> 0x0000000b

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4791 Comm: syz-executor.2 Not tainted 6.0.0-rc7-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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