syzbot

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BUG: KCSAN: data-race in io_wq_worker_running / io_wqe_activate_free_worker

write to 0xffff88813b46ab44 of 4 bytes by task 12772 on cpu 0:
 io_wq_worker_running+0x60/0xa0 io_uring/io-wq.c:678
 schedule_timeout+0xc1/0x290 kernel/time/timer.c:2167
 io_wqe_worker+0x3e1/0x8e0 io_uring/io-wq.c:647
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff88813b46ab44 of 4 bytes by task 12681 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:475
 io_queue_async+0x45e/0x490 io_uring/io_uring.c:2008
 io_queue_sqe io_uring/io_uring.c:2032 [inline]
 io_req_task_submit+0xeb/0x100 io_uring/io_uring.c:1369
 handle_tw_list+0x12a/0x180 io_uring/io_uring.c:1147
 tctx_task_work+0xe3/0x3d0 io_uring/io_uring.c:1207
 task_work_run+0xde/0x110 kernel/task_work.c:179
 get_signal+0xb00/0xc70 kernel/signal.c:2635
 arch_do_signal_or_restart+0x85/0x290 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:168
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000005 -> 0x00000003

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12681 Comm: syz-executor.4 Tainted: G        W          6.2.0-rc6-syzkaller-00050-g9f266ccaa2f5-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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