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

On Thu, Dec 8, 2016 at 8:30 AM, Dmitry Vyukov [off-list ref] 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.