openssh bugs - Aug 2010 - [Bug 1805] New: consumption of file descriptors using a port forwarding channel

https://bugzilla.mindrot.org/show_bug.cgi?id=1805

           Summary: consumption of file descriptors using a port
                    forwarding channel
           Product: Portable OpenSSH
           Version: 5.5p1
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: sshd
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: Walter.Pfannenmueller at siemens.com


Created attachment 1910
  --> https://bugzilla.mindrot.org/attachment.cgi?id=1910
sshd debug and system strace

This was tested on a Suse Linux 11.2

Establishing a port forwarding channel 

ssh -N -R 11001:<clienthost>:443 -o TCPKeepAlive=yes target

and using the channel with 
wget -q --no-check-certificate https://127.0.0.1:11001/

many, many times. 
Every now and then a fd isn't freed again.
In the attachement there is the sshd debug output and
a strace to show that the number of supervised fds in the select call
increase.

The traces are quit big, but not to the bitter end (exhaustion of all
fds).

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https://bugzilla.mindrot.org/show_bug.cgi?id=1805

Damien Miller <djm at mindrot.org> changed:

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

--- Comment #1 from Damien Miller <djm at mindrot.org> 2010-10-12 14:24:57
EST ---
Hi,

I can't replicate this on OpenBSD or Ubuntu running OpenSSH 5.6. My
tests used netcat instead of wget and your unspecified webserver. Could
you please try to recreate problem using netcat or similar? It might be
possible that you webserver is getting stuck and holding connections
open.

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https://bugzilla.mindrot.org/show_bug.cgi?id=1805

Damien Miller <djm at mindrot.org> changed:

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

--- Comment #2 from Damien Miller <djm at mindrot.org> 2011-05-06 11:39:01
EST ---
We can't reproduce this bug, so I will close it. Please reopen if you
have additional information.

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Damien Miller <djm at mindrot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #3 from Damien Miller <djm at mindrot.org> 2011-09-06 15:33:10
EST ---
close resolved bugs now that openssh-5.9 has been released

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