I've reproduced this on GCE also. Here's what ssh.service looks like
during the hang (and it looks like the reload hasn't affected it):
$ sudo systemctl status ssh.service
● ssh.service - OpenBSD Secure Shell server
Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset:
enabled)
Active: active (running) since Thu 2016-06-23 08:32:11 UTC; 6min ago
Process: 2702 ExecReload=/bin/kill -HUP $MAINPID (code=exited,
status=0/SUCCESS)
Main PID: 1643 (sshd)
Tasks: 1
Memory: 3.8M
CPU: 108ms
CGroup: /system.slice/ssh.service
└─1643 /usr/sbin/sshd -D
Jun 23 08:32:11 xenial-160623-0931 systemd[1]: Started OpenBSD Secure Shell
server.
Jun 23 08:32:17 xenial-160623-0931 sshd[1747]: Accepted publickey for ubuntu
from 86.179.225.58 port 46404 ssh2: RSA
SHA256:HRlolnELGM4aMQXejVDjc0kWktid481/BsLIHtc7Tv0
Jun 23 08:32:17 xenial-160623-0931 sshd[1747]: pam_unix(sshd:session): session
opened for user ubuntu by (uid=0)
Jun 23 08:37:17 xenial-160623-0931 systemd[1]: Reloading OpenBSD Secure Shell
server.
Jun 23 08:37:17 xenial-160623-0931 sshd[1643]: Received SIGHUP; restarting.
Jun 23 08:37:17 xenial-160623-0931 systemd[1]: Reloaded OpenBSD Secure Shell
server.
Jun 23 08:37:17 xenial-160623-0931 sshd[1643]: Server listening on 0.0.0.0 port
22.
Jun 23 08:37:17 xenial-160623-0931 sshd[1643]: Server listening on :: port 22.
Jun 23 08:37:22 xenial-160623-0931 sshd[3134]: Accepted publickey for ubuntu
from 86.179.225.58 port 46520 ssh2: RSA
SHA256:HRlolnELGM4aMQXejVDjc0kWktid481/BsLIHtc7Tv0
Jun 23 08:37:22 xenial-160623-0931 sshd[3134]: pam_unix(sshd:session): session
opened for user ubuntu by (uid=0)
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https://bugs.launchpad.net/bugs/1584393
Title:
systemctl restart networking hangs reloading ssh.service
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