Bug#932281: /usr/bin/ssh: slogin and ssh behave different at starting remote mathematica session

[Markus Hetzmannseder <Markus.Hetzmannseder@jku.at>]

Package: openssh-client
Version: 1:7.4p1-10+deb9u6
Severity: normal
File: /usr/bin/ssh

I found a problem to start mathematica (version 12.0) on a remote server via slogin-command to do the login an the remote server. As far as i can see the ssh-command and the slogin-command should behave identicall, because slogin is just a symbolic link to ssh.

How i can reproduce the bug on my network:

haydn:~ $ ssh offenbach      # ssh login to remote server
offenbach:~ $ xterm          # X-forward test via simple xterm, xterm opens up
offenbach:~ $ mathematica    # after closing xterm, startup mathematica version 12.0, working
offenbach:~ $ exit           # after closing mathematica, logout

haydn:~ $ slogin offenbach   # ssh login to remote server, now with slogin command
offenbach:~ $ xterm  	     # xterm working again
offenbach:~ $ mathematica    # now no mathematica window is coming up and i have to kill the
                             # hanging mathematica process (its the same with older version 11.3 too)

I cant see where this difference between ssh and slogin is coming from. I could not find other built in programms from the debian distribution itself to reproduce this.


-- System Information:
Debian Release: 9.9
  APT prefers oldstable-updates
  APT policy: (500, 'oldstable-updates'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.20.13-offenbach (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages openssh-client depends on:
ii  adduser           3.115
ii  dpkg              1.18.25
ii  libc6             2.24-11+deb9u4
ii  libedit2          3.1-20160903-3
ii  libgssapi-krb5-2  1.15-1+deb9u1
ii  libselinux1       2.6-3+b3
ii  libssl1.0.2       1.0.2s-1~deb9u1
ii  passwd            1:4.4-4.1
ii  zlib1g            1:1.2.8.dfsg-5

Versions of packages openssh-client recommends:
ii  xauth  1:1.0.9-1+b2

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

-- Configuration Files:
/etc/ssh/ssh_config changed:
Host *
   ForwardAgent yes
   ForwardX11 yes
   ForwardX11Trusted yes
    SendEnv LANG LC_*
    HashKnownHosts yes
    GSSAPIAuthentication yes


-- no debconf information