syzbot

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BUG: KCSAN: data-race in io_req_task_complete / io_wq_free_work

write to 0xffff888104a75d44 of 4 bytes by task 8744 on cpu 0:
 io_req_complete_state fs/io_uring.c:2111 [inline]
 io_req_task_complete+0x9a/0x470 fs/io_uring.c:2985
 handle_tw_list fs/io_uring.c:2463 [inline]
 tctx_task_work+0x80b/0xa30 fs/io_uring.c:2497
 task_work_run+0x8e/0x110 kernel/task_work.c:164
 get_signal+0xeca/0x1020 kernel/signal.c:2641
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:867
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888104a75d44 of 4 bytes by task 8830 on cpu 1:
 req_ref_put_and_test fs/io_uring.c:1248 [inline]
 io_put_req_find_next fs/io_uring.c:2700 [inline]
 io_wq_free_work+0x1d/0x140 fs/io_uring.c:7267
 io_worker_handle_work+0x550/0xc50 fs/io-wq.c:600
 io_wqe_worker+0x1d1/0x940 fs/io-wq.c:644
 ret_from_fork+0x1f/0x30

value changed: 0x048c4100 -> 0x048d0100

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8830 Comm: iou-wrk-8744 Not tainted 5.18.0-rc5-syzkaller-00163-g4b97bac0756a-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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