openssh bugs - Aug 2024 - [Bug 3728] New: Erroneous Message printed to console - ! debug1: fd 0 clearing O_NONBLOCK

https://bugzilla.mindrot.org/show_bug.cgi?id=3728

            Bug ID: 3728
           Summary: Erroneous Message printed to console - ! debug1: fd 0
                    clearing O_NONBLOCK
           Product: Portable OpenSSH
           Version: 9.8p1
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: trivial
          Priority: P5
         Component: scp
          Assignee: unassigned-bugs at mindrot.org
          Reporter: splitnines at gmail.com

When performing an SCP copy from any Cisco IOS-XE device the following
message is printed to the terminal:

! debug1: fd 0 clearing O_NONBLOCK


The whole output is as follows:

rr1#copy run scp://10.0.0.84:2222/
Address or name of remote host [10.0.0.84]?
Destination username [cisco]? root
Destination filename [rr1-confg]?
Writing rr1-confg
Password:
 Sink: C0644 4809 rr1-confg
! debug1: fd 0 clearing O_NONBLOCK

4809 bytes copied in 3.067 secs (1568 bytes/sec)


I walked back the OpenSSH version on a container image to see which
version this debug message was first observed.  I found that version
openssh-8.7p1 is the first.  Version openssh-8.6p1 does not display the
debug message.

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Rickey Ingrassia <splitnines at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |splitnines at gmail.com

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |djm at mindrot.org
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED

--- Comment #1 from Damien Miller <djm at mindrot.org> ---
You'll need to take this up with Cisco I'm afraid. These messages are
not printed by the version of OpenSSH that we ship unless the user has
enabled debugging output.

Either Cisco has enabled debugging output on their client side, or is
invoking the remote scp with debugging enabled. In either case, we're
not in a position to fix how the are messing this up.

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--- Comment #2 from Rickey Ingrassia <splitnines at gmail.com> ---
Thank you for your quick response and time.

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