[Bug 2573] New: dead sessions cannot be closed with ~.

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2573

            Bug ID: 2573
           Summary: dead sessions cannot be closed with ~.
           Product: Portable OpenSSH
           Version: 3.7.1p2
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: calestyo at scientia.net

Hey.

This is may be the client-side counterpart to bug #2572.
Versions, distro, etc., all as there, i.e. I also think it may have
started with 6.9 (but I may be wrong her).


Every now and then, when some connections get stuck (it e.g. happens
sometimes, but not always, when I reboot the server, and Debian's ssh
systemd units do not yet properly close ssh connections before they
kill networking, see
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751636), ~. doesn't
work anymore to terminate the session/client.

Similarly, but perhaps another issue comes happens during this
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770135 ... see also
its duplicate reports there):
When dbus is restarted, something gets apparently wrong with
systemd-logind... and the logins with ssh are considerably delayed
(until they finally succeed when something in systemd or so times out).
Now this is a systemd/dbus/whatever problem,... BUT... during the
server hangs, because of that bug,... the client side hangs either.
Neither ~. nor Ctrl-C work then (even though no remote shell login has
happened yet)


Amongst other, my ssh_config has:
TCPKeepAlive    no
ServerAliveInterval     15
ServerAliveCountMax     8

But right now, I cannot really tell if the client also seems to fail
enforcing the Alive, as the server does (Bug 2572)... will wait for the
8*15s period next time it happens.


Any ideas?

Chris.

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