Bug#912569: openssh-client: openssh 7.8p1-1 and higher fail to connect to any host, "packet_write_wait: Broken pipe"

[Timo Rothenpieler <timo@rothenpieler.org>]

Package: openssh-client
Version: 1:7.8p1-1
Severity: normal

Dear Maintainer,

After upgrading from Debian 9 to 10, I cannot ssh anywhere anymore.
It always ends up with the exact same error:
http://paste.debian.net/1049963

The first version this happens on is 7.8p1-1, as well as any later version right now.
Downgrading to openssh-client 7.7p1-4 fixes the issue.


-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.18.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages openssh-client depends on:
ii  adduser           3.118
ii  dpkg              1.19.2
ii  libc6             2.27-6
ii  libedit2          3.1-20180525-1
ii  libgssapi-krb5-2  1.16.1-1
ii  libselinux1       2.8-1+b1
ii  libssl1.0.2       1.0.2o-1
ii  passwd            1:4.5-1.1
ii  zlib1g            1:1.2.11.dfsg-1

Versions of packages openssh-client recommends:
ii  xauth  1:1.0.10-1

Versions of packages openssh-client suggests:
pn  keychain      <none>
pn  libpam-ssh    <none>
pn  monkeysphere  <none>
pn  ssh-askpass   <none>

-- no debconf information