Fix rare segfault when shutting down slurmctld and still sending data to

the database.

NEWS

@@ -16,6 +16,8 @@ documents those changes that are of interest to users and administrators.
     allocation of "20,22" must be expressed as "20\n22".
  -- Fix pam_slurm_adopt.so (and other external code linked against libslurm)
     by exporting adding s_p_get_uint64 to slurm_xlator.h.
+ -- Fix rare segfault when shutting down slurmctld and still sending data to
+    the database.
 
 * Changes in Slurm 17.02.1-2
 ============================

src/common/slurmdbd_defs.c

@@ -419,6 +419,9 @@ static void _open_slurmdbd_conn(bool need_db)
 		/* clear errno (checked after this for errors) */
 		errno = 0;
 		return;
+	} else if (slurmdbd_shutdown) {
+		debug("Request to open slurmdbd_conn after shutdown, denied.");
+		return;
 	}
 
 	slurm_persist_conn_close(slurmdbd_conn);