The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/bin/scp/Makefile,v 1.6 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/PROTOCOL,v 1.17 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/PROTOCOL.certkeys,v 1.13 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/auth-options.c,v 1.27 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/auth-options.h,v 1.15 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/auth-pam.c,v 1.20 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/auth.c,v 1.31 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/auth2-hostbased.c,v 1.20 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/auth2-kbdint.c,v 1.14 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/auth2-pubkey.c,v 1.29 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/channels.c,v 1.31 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/channels.h,v 1.20 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/clientloop.c,v 1.33 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/compat.c,v 1.23 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/compat.h,v 1.15 2021.09.02.11.26.17 christos src/crypto/external/bsd/openssh/dist/dns.c,v 1.19 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/dns.h,v 1.12 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/hostfile.c,v 1.21 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/krl.c,v 1.20 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/log.c,v 1.24 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/misc.c,v 1.27 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/misc.h,v 1.22 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/moduli-gen/moduli.2048,v 1.11 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/moduli-gen/moduli.3072,v 1.13 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/moduli-gen/moduli.4096,v 1.13 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/moduli-gen/moduli.6144,v 1.13 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/moduli-gen/moduli.7680,v 1.13 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/moduli-gen/moduli.8192,v 1.13 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/monitor.c,v 1.38 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/mux.c,v 1.30 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/nchan.c,v 1.13 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/packet.c,v 1.45 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/packet.h,v 1.23 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/readconf.c,v 1.35 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/readconf.h,v 1.27 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/readpass.c,v 1.17 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/scp.1,v 1.24 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/scp.c,v 1.32 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/servconf.c,v 1.37 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/servconf.h,v 1.26 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/serverloop.c,v 1.31 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/session.c,v 1.35 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sftp-client.c,v 1.28 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sftp-client.h,v 1.14 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sftp-server.8,v 1.14 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sftp-server.c,v 1.25 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sftp.1,v 1.25 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sftp.c,v 1.33 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sk-usbhid.c,v 1.6 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/ssh-keygen.1,v 1.29 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/ssh-keygen.c,v 1.40 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/ssh-keysign.c,v 1.22 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/ssh-pkcs11-helper.c,v 1.21 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/ssh-pkcs11.c,v 1.23 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/ssh.1,v 1.30 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/ssh.c,v 1.37 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/ssh_config.5,v 1.31 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sshbuf-misc.c,v 1.13 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sshconnect.c,v 1.31 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sshconnect2.c,v 1.41 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sshd.8,v 1.25 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sshd.c,v 1.44 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sshd_config,v 1.26 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sshd_config.5,v 1.35 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sshkey.c,v 1.27 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sshkey.h,v 1.15 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/sshsig.c,v 1.7 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/dist/version.h,v 1.37 2021.09.02.11.26.18 christos src/crypto/external/bsd/openssh/lib/shlib_version,v 1.30 2021.09.02.11.27.19 christos src/doc/3RDPARTY,v 1.1813 2021.09.02.11.27.19 christos src/doc/CHANGES,v 1.2827 2021.09.02.11.28.45 christos src/distrib/sets/lists/base/shl.mi,v 1.925 2021.09.02.11.28.45 christos src/distrib/sets/lists/debug/shl.mi,v 1.282 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2021.09.html#2021.09.02.11.28.45