The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2020.09.30.16.35.49 skrll src/sys/arch/aarch64/aarch64/cpuswitch.S,v 1.28 2020.09.30.16.35.49 skrll src/sys/arch/aarch64/aarch64/vectors.S,v 1.19 2020.09.30.16.47.55 skrll src/sys/arch/aarch64/aarch64/aarch64_machdep.c,v 1.49 2020.09.30.17.05.59 roy src/tests/net/if_tap/Makefile,v 1.4 2020.09.30.17.11.31 christos src/distrib/sets/lists/comp/md.amd64,v 1.284 2020.09.30.17.14.11 roy src/tests/net/if_tap/Makefile,v 1.5 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2020.09.html#2020.09.30.17.14.11