quoted

IMHO, if this is something which should not happen at all, a BUG_ON() is the
right thing to do here.

I don't agree on that. I agree it should not happen but since it's a
recoverable error it think we should not panic.

FWIW, if this is a recoverable error, I think Linus will agree with
Patrick on this one :-)

https://lkml.org/lkml/2016/10/4/1