RootCauseunvalidated
it marks the existing entry as deleted (len=0, alignment=0) without unlinking it from the hash chain, then calls `bfd_hash_insert`.
fe45a4b1-1386-44ef-a735-90c26acabd93
it marks the existing entry as deleted (len=0, alignment=0) without unlinking it from the hash chain, then calls bfd_hash_insert.