Corpus for keyctl$join:

Coverage	Program
946	socket$inet_tcp-accept4-ioctl$LOOP_CTL_REMOVE-openat$loop_ctrl-ioctl$LOOP_CTL_REMOVE-socket$inet_tcp-recvfrom-ioctl$LOOP_CTL_ADD-socket$nl_generic-accept4-syz_open_procfs$userns-mount_setattr-getcwd-sendmsg$SEG6_CMD_GET_TUNSRC-ioctl$LOOP_CTL_REMOVE-ioctl$LOOP_CTL_ADD-ioctl$LOOP_CTL_GET_FREE-ioctl$LOOP_CTL_REMOVE-ioctl$LOOP_CTL_ADD-keyctl$join
403	perf_event_open-keyctl$join-keyctl$join
397	perf_event_open-keyctl$join
329	add_key$keyring-keyctl$KEYCTL_RESTRICT_KEYRING-keyctl$join
223	perf_event_open-keyctl$join-keyctl$join
206	perf_event_open-keyctl$join
171	newfstatat-setresuid-keyctl$join-keyctl$join
165	munmap-keyctl$join