On Sun, Mar 27, 2016 at 05:03:44AM -0700, Linus Torvalds wrote: > Anyway, I don't think that DEBUG_LOCKS_WARN_ON() in > > kernel/locking/lockdep.c:2017 __lock_acquire > > would be an ext4 issue, it looks more like an internal lockdep issue. > > Adding in the lockdep people, who will set me right.
You are right; this is lockdep running into a hash collision; which is a
new DEBUG_LOCKDEP test. See 9e4e7554e755 ("locking/lockdep: Detect
chain_key collisions").
