[Bug 1382] New: scp/sftp sometimes hangs as a ControlMaster slave

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https://bugzilla.mindrot.org/show_bug.cgi?id=1382

           Summary: scp/sftp sometimes hangs as a ControlMaster slave
    Classification: Unclassified
           Product: Portable OpenSSH
           Version: 4.7p1
          Platform: ix86
        OS/Version: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: scp
        AssignedTo: bitbucket at mindrot.org
        ReportedBy: mzwcp6002 at sneakemail.com


This can be reproduced with the attached Perl script, which sets up a
ControlMaster master and repeatedly copies the file 'foo' from some
remote location.  On MacOS X (Intel), it hangs at some number of
iterations, sometimes 20ish, 40ish, 150, etc.  The script only tests
scp, but I remember having similar issues with sftp before.

Some extra background on this bug: the version control system darcs
uses the ControlMaster feature because operations like committing
patches or retrieving them from a remote repository requires several
invocations of ssh, scp and sftp, not necessarily in that order.  We
were pretty happy with the ControlMaster feature until one day, MacOS X
users on the Intel machines started reporting that darcs would
mysteriously hang in the middle of some operation using a remote
repository.  I have also heard one report that darcs with ControlMaster
enabled also sometimes hangs on Linux, but have not been able to
confirm it.

I've been stumped on this one for ages until a user suggested we try
reproducing it outside of darcs, hence the attached Perl script.

Thanks!

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