[Bug 1988] New: ControlPersist causes stderr to be left open until the master connection times out

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1988

             Bug #: 1988
           Summary: ControlPersist causes stderr to be left open until the
                    master connection times out
    Classification: Unclassified
           Product: Portable OpenSSH
           Version: 5.8p2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ssh
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: amcnabb at mcnabbs.org


As has been noted previously, when ControlPersist is set, the
background process hangs on to stderr until it terminates:

https://bugzilla.mindrot.org/show_bug.cgi?id=1330#c1
https://lwn.net/Articles/401651/

This means that any script that uses stderr from an ssh script will
hang until the master connection eventually times out. I'm opening this
bug because a user noticed that this makes pssh hang:

http://code.google.com/p/parallel-ssh/issues/detail?id=67

If the background ssh process were to close stderr, then pssh would not
hang.

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