I have exactly the same problem on my host. Host OS: Debian 8.10.
Container OS: Debian 9.4

I started "/usr/sbin/sshd -d  -p 8022", and when I connected to it from
another host, the process has hung with the latest log message:

debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8

Also strace shows a similar line:

# strace -p 12014
strace: Process 12014 attached
sendto(3, "<39>May  6 02:42:08 sshd[12014]:"..., 94, MSG_NOSIGNAL, NULL, 0

Then while this was hanging, I did "apt-get remove inetutils-syslogd",
and the SSH session immediately went through.

But RDP client still cannot connect to xrdp running in this container.
I'll keep watching it after a reboot.

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https://bugs.launchpad.net/bugs/1572061

Title:
  login sessions hangs in lxc

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