diff -uNr systemd-228-orig/src/network/networkd-link.c systemd-228-fix/src/network/networkd-link.c --- systemd-228-orig/src/network/networkd-link.c 2017-11-07 11:07:43.366280859 -0800 +++ systemd-228-fix/src/network/networkd-link.c 2017-11-07 12:17:51.267674643 -0800 @@ -147,8 +147,10 @@ p = strjoina("/proc/sys/net/ipv6/conf/", link->ifname, "/disable_ipv6"); _cleanup_free_ char *val = NULL; r = read_one_line_file(p, &val); - if (r < 0) + if (r < 0) { log_link_warning_errno(link, r, "Cannot read ipv6 state for interface: %m"); + return false; + } if (streq(val, "0")) return false;