The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2017.09.17.05.47.19 kre src/sys/rump/librump/rumpkern/locks.c,v 1.75 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2017.09.html#2017.09.17.05.47.19