I lied. I experimented with ./configure flags.
--with-kerberos5=/usr
is definitely the flag that is triggering the crash. Removing this
flag alone cures the crash.
Command that was used:
../configure --build=x86_64-linux-gnu --prefix=/usr \
--includedir=\${prefix}/include --mandir=\${prefix}/share/man \
--infodir=\${prefix}/share/info --sysconfdir=/etc \
--localstatedir=/var --disable-silent-rules \
--libdir=\${prefix}/lib/x86_64-linux-gnu \
--libexecdir=\${prefix}/lib/x86_64-linux-gnu \
--disable-maintainer-mode --disable-dependency-tracking \
--sysconfdir=/etc/ssh --libexecdir=\${prefix}/lib/openssh \
--disable-strip --with-mantype=doc --with-4in6 \
--with-privsep-path=/run/sshd --with-pid-dir=/run \
--with-tcp-wrappers --with-pam --with-libedit \
--with-systemd \
--with-xauth=/usr/bin/xauth \
--with-default-path=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
\
--with-superuser-path=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
\
--with-cflags="-Wdate-time -D_FORTIFY_SOURCE=2 -g -O2
-fdebug-prefix-map=/home/kennykb/debian.org/openssh=. -fstack-protector-strong
-Wformat -Werror=format-security -DSSH_EXTRAVERSION=\\\"Ubuntu-3\\\""
"--with-ldflags=-Wl,--as-needed -Wl,-Bsymbolic-functions -Wl,-z,relro
-Wl,-z,now" \
--with-ssl-engine --with-selinux --with-audit=linux
# removed
# --with-kerberos5=/usr
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https://bugs.launchpad.net/bugs/1690485
Title:
openssh-server SIGSYS with 'UsePrivilegeSeparation sandbox'
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