Upstream commit 4624e9fca1b02b64e25e8b2280a0186182ab73ba
To fix SIGABRT: https://github.com/shadow-maint/shadow/issues/394
Index: shadow-4.9/src/useradd.c
===================================================================
--- shadow-4.9.orig/src/useradd.c
+++ shadow-4.9/src/useradd.c
@@ -420,7 +420,6 @@ static void get_defaults (void)
 			} else {
 				def_group = grp->gr_gid;
 				def_gname = xstrdup (grp->gr_name);
-				gr_free(grp);
 			}
 		}