diff -uNr systemd-233/src/network/networkd-link.c systemd-233-new/src/network/networkd-link.c --- systemd-233/src/network/networkd-link.c 2017-11-07 20:56:56.740898979 +0000 +++ systemd-233-new/src/network/networkd-link.c 2017-11-07 21:02:26.532914705 +0000 @@ -213,8 +213,10 @@ 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;