The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2019.07.16.21.13.28 christos src/tests/fs/vfs/t_io.c,v 1.19 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2019.07.html#2019.07.16.21.13.28