openssh bugs - Oct 2003 - [Bug 750] "buffer_append_space: alloc 10506240 not supported" on AIX5 when attempting to use compression

http://bugzilla.mindrot.org/show_bug.cgi?id=750

           Summary: "buffer_append_space: alloc 10506240 not
supported" on
                    AIX5 when attempting to use compression
           Product: Portable OpenSSH
           Version: -current
          Platform: All
        OS/Version: AIX
            Status: NEW
          Severity: major
          Priority: P2
         Component: ssh
        AssignedTo: openssh-bugs at mindrot.org
        ReportedBy: andrew_wrobel at hotmail.com


Using openssh-3.7.1p2 on AIX 4.3.3, 5.1 and 5.2.

  When attempting to connect, with compression, to sshd running on an AIX 5 
machine, sshd kills the connection after accepting the users password.

  syslog, on the AIX 5 machine, reports the following error message:

fatal: buffer_append_space: alloc 10506240 not supported

  Attempt to connect, without compression, to sshd running on AIX 5.x works 
fine.

  AIX 4.3.3 doesn't have the issue at all.  I've found references to
this
problem going back to openssh 3.4 without any resolution.  Any help/suggestion 
would be greatly appreciated.



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------- Additional Comments From dtucker at zip.com.au  2003-10-29 09:02 -------
I've seen this a few times before and it's usually an issue with zlib. 
Please
try recompiling zlib, then recompiling openssh.  Make sure you're using zlib
1.
1.4, and that there isn't an old zlib somewhere in your link path.



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------- Additional Comments From andrew_wrobel at hotmail.com  2003-10-29 09:31
-------
I had seen references to that as well.

I have recompiled zlib 1.1.4, verified that an older zlib isn't located on
the
system.

I've recompiled openssh a couple of different times, using different
configure
options, still the same issue.

Would compiling openssh WITHOUT zlib fix the problem?



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------- Additional Comments From dtucker at zip.com.au  2003-10-29 09:51 -------
zlib is required, you can't compile without it.

You're not using the gcc-2.9x that came on the AIX toolbox CD are you? 
I've
personally seen that miscompile openssl, and I suspect it of causing a number of
other problems.  If you're using it, I strongly suggest you upgrade to a
newer
gcc.  If that's not possible, compile zlib and openssh (and openssl if you 
compiled it with that compiler) without optimization and see if the problem 
persists.



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