The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2021.02.19.14.44.29 rillig src/usr.bin/xlint/lint1/ckgetopt.c,v 1.2 2021.02.19.14.51.59 christos src/sys/net/if_arp.h,v 1.43 2021.02.19.14.51.59 christos src/sys/net/if_bridge.c,v 1.179 2021.02.19.14.51.59 christos src/sys/netinet/if_arp.c,v 1.307 2021.02.19.14.51.59 christos src/sys/netinet/in_l2tp.c,v 1.20 2021.02.19.14.51.59 christos src/sys/netinet/ip_flow.c,v 1.85 2021.02.19.14.51.59 christos src/sys/netinet/ip_input.c,v 1.399 2021.02.19.14.51.59 christos src/sys/netinet/ip_private.h,v 1.6 2021.02.19.14.51.59 christos src/sys/netinet/tcp_input.c,v 1.426 2021.02.19.14.51.59 christos src/sys/netinet/tcp_private.h,v 1.6 2021.02.19.14.51.59 christos src/sys/netinet/udp_private.h,v 1.6 2021.02.19.14.51.59 christos src/sys/netinet/udp_usrreq.c,v 1.261 2021.02.19.14.51.59 christos src/sys/sys/mbuf.h,v 1.232 2021.02.19.14.51.59 christos src/sys/sys/param.h,v 1.690 2021.02.19.14.52.00 christos src/sys/netinet6/icmp6.c,v 1.250 2021.02.19.14.52.00 christos src/sys/netinet6/in6_l2tp.c,v 1.21 2021.02.19.14.52.00 christos src/sys/netinet6/ip6_flow.c,v 1.42 2021.02.19.14.52.00 christos src/sys/netinet6/ip6_input.c,v 1.224 2021.02.19.14.52.00 christos src/sys/netinet6/ip6_private.h,v 1.6 2021.02.19.14.52.00 christos src/sys/netinet6/udp6_usrreq.c,v 1.150 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2021.02.html#2021.02.19.14.52.00