syzbot

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BUG: KCSAN: data-race in io_worker_handle_work / io_wqe_activate_free_worker

write to 0xffff88814faabcc4 of 4 bytes by task 9511 on cpu 1:
 __io_worker_busy io_uring/io-wq.c:420 [inline]
 io_worker_handle_work+0x35b/0xc00 io_uring/io-wq.c:560
 io_wqe_worker+0x210/0x8f0 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

read to 0xffff88814faabcc4 of 4 bytes by task 9502 on cpu 0:
 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:472
 io_queue_async+0x323/0x350 io_uring/io_uring.c:1901
 io_queue_sqe io_uring/io_uring.c:1925 [inline]
 io_submit_sqe+0x700/0xa40 io_uring/io_uring.c:2174
 io_submit_sqes+0x274/0x530 io_uring/io_uring.c:2285
 __do_sys_io_uring_enter io_uring/io_uring.c:3220 [inline]
 __se_sys_io_uring_enter+0x1ef/0xc00 io_uring/io_uring.c:3152
 __x64_sys_io_uring_enter+0x74/0x80 io_uring/io_uring.c:3152
 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: 0 PID: 9502 Comm: syz-executor.3 Not tainted 6.1.0-rc6-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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