[Bug 1917] Escape sequence (~) doesn't work right with ControlMaster/ControlPersist connections

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1917

--- Comment #8 from Damien Miller <djm at mindrot.org> 2011-10-21 11:16:47 EST ---
I got a chance to catch a ssh client in this state the other day and
connect to it with a debugger for a couple of minutes before
ServerAliveInterval killed it.

It turns out that the first ~. is actually killing the session, but for
some reason the session isn't being released.

Notes for next time:

1) clear server_alive_count_max to get a longer debugging session
2) try attaching before issuing ~.
3) reset log channel to syslog and loglevel to debug3

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