Description of problem:

* start glusterd
* take statedump
* glusterd crashes

Thread 1 (Thread 0x7f535fd71700 (LWP 1557)):
#0  glusterd_dump_priv (this=<optimized out>) at glusterd-statedump.c:243
#1  0x00007f5367aaf655 in gf_proc_dump_xlator_info (top=<optimized out>) at statedump.c:502
#2  0x00007f5367aafb92 in gf_proc_dump_info (signum=signum@entry=10, ctx=0xd1e010) at statedump.c:837
#3  0x00000000004089b9 in glusterfs_sigwaiter (arg=<optimized out>) at glusterfsd.c:2083
#4  0x0000003866e07d14 in start_thread (arg=0x7f535fd71700) at pthread_create.c:309
#5  0x0000003866af168d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115
(gdb) l
248	                                                "pmap[%d].type", port);
249	                        gf_proc_dump_write (key, "%d", pmap->ports[port].type);
250	                        gf_proc_dump_build_key (key, "glusterd",
251	                                                "pmap[%d].brickname", port);
252	                        gf_proc_dump_write (key, "%s",
253	                                            pmap->ports[port].brickname);
254	
255	                }
256	                /* Dump client details */
257	                glusterd_dump_client_details (priv);
(gdb) p pmap
$2 = (struct pmap_registry *) 0x0
(gdb) l glusterd-statedump.c:243
238	                /* Dump peer details */
239	                GLUSTERD_DUMP_PEERS (&priv->peers, uuid_list, _gf_false);
240	
241	                /* Dump pmap data structure from base port to last alloc */
242	                pmap = priv->pmap;
243	                for (port = pmap->base_port; port <= pmap->last_alloc;
244	                     port++) {
245	                        gf_proc_dump_build_key (key, "glusterd", "pmap_port");
246	                        gf_proc_dump_write (key, "%d", port);
247	                        gf_proc_dump_build_key (key, "glusterd",
(gdb) p pmap
$3 = (struct pmap_registry *) 0x0

I think since there are no bricks, pmap is NULL resulting in crash. This _MAY_ not happen when there are volumes and bricks associated with glusterd

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