[Bug 1938] New: EscapeChar sometimes don't work when using ControlMaster

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https://bugzilla.mindrot.org/show_bug.cgi?id=1938

             Bug #: 1938
           Summary: EscapeChar sometimes don't work when using
                    ControlMaster
    Classification: Unclassified
           Product: Portable OpenSSH
           Version: 5.8p1
          Platform: ix86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ssh
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: powerman-asdf at ya.ru


When my ssh connection hangs (usually after ADSL PPPoE reconnect), I
always was able to kill it using "<Enter>~." combination (EscapeChar is
set to ~, by default).

Few days ago I've added this to my ~/.ssh/config:
    ControlMaster auto
    ControlPath /tmp/ssh_mux_powerman/%r@%h:%p
    ControlPersist 15m
and since that time I no longer able to kill hang ssh connection this
way
(I've to start ssh with "-O exit" from command line for this).

My first thought was EscapeChar doesn't compatible with ControlMaster,
but later I notice "<Enter>~." combination works just fine while ssh
connection is alive, and stop working only after connection hangs.
So, I decide this may be a bug. In any case, it's very annoying side
effect of otherwise cool feature ControlMaster.

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