diff -up shadow-4.6/libmisc/find_new_gid.c.min-limit shadow-4.6/libmisc/find_new_gid.c

--- shadow-4.6/libmisc/find_new_gid.c.min-limit	2018-04-29 18:42:37.000000001 +0200

+++ shadow-4.6/libmisc/find_new_gid.c	2018-11-06 10:51:20.554963292 +0100

@@ -82,6 +82,13 @@ static int get_ranges (bool sys_group, g

                             (unsigned long) *max_id);

 			return EINVAL;

 		}

+		/*

+		 * Zero is reserved for root and the allocation algorithm does not

+		 * work right with it.

+		 */

+		if (*min_id == 0) {

+			*min_id = (gid_t) 1;

+		}

 	} else {

 		/* Non-system groups */

diff -up shadow-4.6/libmisc/find_new_uid.c.min-limit shadow-4.6/libmisc/find_new_uid.c

--- shadow-4.6/libmisc/find_new_uid.c.min-limit	2018-04-29 18:42:37.000000001 +0200

+++ shadow-4.6/libmisc/find_new_uid.c	2018-11-06 10:51:39.341399569 +0100

@@ -82,6 +82,13 @@ static int get_ranges (bool sys_user, ui

                             (unsigned long) *max_id);

 			return EINVAL;

 		}

+		/*

+		 * Zero is reserved for root and the allocation algorithm does not

+		 * work right with it.

+		 */

+		if (*min_id == 0) {

+			*min_id = (uid_t) 1;

+		}

 	} else {

 		/* Non-system users */