The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2020.09.30.07.55.31 mrg src/etc/mtree/NetBSD.dist.tests,v 1.177 2020.09.30.08.21.27 martin src/etc/mtree/NetBSD.dist.tests,v 1.178 2020.09.30.08.32.00 martin src/etc/mtree/NetBSD.dist.tests,v 1.179 2020.09.30.08.40.49 ryo src/sys/arch/aarch64/include/armreg.h,v 1.54 2020.09.30.08.43.47 ryo src/sys/arch/aarch64/aarch64/procfs_machdep.c,v 1.2 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2020.09.html#2020.09.30.08.43.47