The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.02.16.07.04.51 ozaki-r src/sys/kern/kern_synch.c,v 1.314 2018.02.16.07.05.21 knakahara src/distrib/sets/lists/comp/mi,v 1.2182 2018.02.16.07.11.50 ozaki-r src/sys/sys/lwp.h,v 1.178 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.02.html#2018.02.16.07.11.50