this happened when /etc/glusterd was removed but glusterfsd was running some process and doing add-brick -

=======
# rm -rf /etc/glusterd/ && rm -rf /usr/local/var/log/glusterfs/* && killall glusterd && killall glusterfs

[root@ip-10-202-54-53 ~]# mkdir /mnt/oct2
[root@ip-10-202-54-53 ~]# glusterd
[root@ip-10-202-54-53 ~]# ls /mnt/oct2
linux-2.6.35.7

[root@ip-10-202-54-53 ~]# less /usr/local/var/log/glusterfs/usr-local-etc-glusterfs-glusterd.vol.log 
[root@ip-10-202-54-53 ~]# ps aux | grep gluster
root     16515  0.0  1.0  47896 17564 ?        Ssl  02:40   0:00 glusterd
root     16519  0.0  2.1  78832 37748 ?        Ssl  02:43   0:00 /usr/local/sbin/glusterfsd --xlator-option bug763487-server.listen-port=6974 -s localhost --volfile-id bug763487.10.202.54.53.mnt-oct2 -p /etc/glusterd/vols/bug763487/run/10.202.54.53-mnt-oct2.pid --brick-name /mnt/oct2 --brick-port 6974 -l /etc/glusterd/logs/bricks/mnt-oct2.log
root     16523  0.0  2.6  79096 47056 ?        Ssl  02:43   0:00 /usr/local/sbin/glusterfs -f /etc/glusterd/nfs/nfs-server.vol -p /etc/glusterd/nfs/run/nfs.pid -l /etc/glusterd/logs/nfs.log
root     16542  0.0  0.0   4056   712 pts/0    R+   03:14   0:00 grep gluster
root     30244  0.1  2.4  99376 42780 ?        Ssl  Oct01   1:37 /usr/local/sbin/glusterfsd --xlator-option dht8-server.listen-port=6971 -s localhost --volfile-id dht8.10.202.54.53.mnt-oct1 -p /etc/glusterd/vols/dht8/run/10.202.54.53-mnt-oct1.pid --brick-name /mnt/oct1 --brick-port 6971 -l /etc/glusterd/logs/bricks/mnt-oct1.log
root     31150  0.0  0.4  49524  7692 ?        Ssl  Oct01   0:00 /usr/local/sbin/glusterfsd --xlator-option dht8-server.listen-port=6973 -s localhost --volfile-id dht8.10.202.54.53.mnt-oct1 -p /etc/glusterd/vols/dht8/run/10.202.54.53-mnt-oct1.pid --brick-name /mnt/oct1 --brick-port 6973 -l /etc/glusterd/logs/bricks/mnt-oct1.log