commit ca5358ef upstream.

... by not hitting rename_retry for reasons other than rename having
happened.  In other words, do _not_ restart when finding that
between unlocking the child and locking the parent the former got
into __dentry_kill().  Skip the killed siblings instead...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[ kamal: backport to 3.13-stable: __dentry_kill() change applied to d_kill() ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>