openssh bugs - Sep 2011 - [Bug 1938] New: EscapeChar sometimes don't work when using ControlMaster

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

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |djm at mindrot.org

--- Comment #1 from Damien Miller <djm at mindrot.org> 2011-09-22 21:32:55
EST ---
I've seen this a couple of times, but only when using ControlPersist
and I didn't have the presence of mind to attach with a debugger. If
you can catch it, a stack trace of where it is stuck would be immensely
helpful in debugging this intermittent problem.

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

Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #2 from Damien Miller <djm at mindrot.org> 2011-09-22 21:57:53
EST ---
silly me - this was already reported in bug 1917.

*** This bug has been marked as a duplicate of bug 1917 ***

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