waiters. Otherwise, owners of the shared-busy state are left blocked and might get into a deadlock. Note that the vm_page_busy_downgrade() function is not used in the tree right now. Reported and tested by: pho (previous version) Reviewed by: alc, markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D8195