Re: fs, net: deadlock between bind/splice on af_unix

[Cong Wang]

On Thu, Dec 8, 2016 at 8:30 AM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote:
> Chain exists of:
>  Possible unsafe locking scenario:
>
>        CPU0                    CPU1
>        ----                    ----
>   lock(sb_writers#5);
>                                lock(&u->bindlock);
>                                lock(sb_writers#5);
>   lock(&pipe->mutex/1);

This looks false positive, probably just needs lockdep_set_class()
to set keys for pipe->mutex and unix->bindlock.