syzbot

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BUG: KCSAN: data-race in io_wq_worker_running / io_wqe_activate_free_worker

write to 0xffff88812b9b2604 of 4 bytes by task 7091 on cpu 1:
 io_wq_worker_running+0x64/0xa0 io_uring/io-wq.c:685
 schedule_timeout+0xcc/0x230 kernel/time/timer.c:2167
 io_wqe_worker+0x4bd/0x8a0 io_uring/io-wq.c:650
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff88812b9b2604 of 4 bytes by task 7055 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_req_task_submit+0xf4/0x130 io_uring/io_uring.c:1423
 handle_tw_list io_uring/io_uring.c:1184 [inline]
 tctx_task_work+0x1fe/0x4d0 io_uring/io_uring.c:1246
 task_work_run+0x123/0x160 kernel/task_work.c:179
 get_signal+0xe64/0xff0 kernel/signal.c:2650
 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000005 -> 0x00000003

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7055 Comm: syz-executor.3 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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