Corpus for keyctl$join:

Coverage	Program
708	perf_event_open-socket$inet6_udplite-syz_io_uring_submit-add_key$keyring-keyctl$revoke-keyctl$join
406	perf_event_open-keyctl$join
404	perf_event_open-socket$inet6_udplite-keyctl$join
376	pkey_mprotect-keyctl$join
129	mount$9p_fd-pkey_mprotect-keyctl$join
122	pkey_mprotect-keyctl$join