openssh bugs - Jan 2025 - [Bug 3772] New: scp "lost connection" failure

https://bugzilla.mindrot.org/show_bug.cgi?id=3772

            Bug ID: 3772
           Summary: scp "lost connection" failure
           Product: Portable OpenSSH
           Version: 9.9p1
          Hardware: Other
                OS: Windows 10
            Status: NEW
          Severity: major
          Priority: P5
         Component: scp
          Assignee: unassigned-bugs at mindrot.org
          Reporter: sponge_bob_128 at cox.net

Get random (but eventual) "lost connection" using scp (which uses
sftp/sftp-server) when transfering huge files via 1G ethernet.  No
problem if use "scp -O" (don't use sftp protocol) or piping
through
ssh.  Will also happen with a local scp via loopback (localhost) so not
a network problem.  Running sshd with "-ddd" shows a "write
failed" and
then the connection is terminated ("chan_shutdown_write").

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https://bugzilla.mindrot.org/show_bug.cgi?id=3772

Darren Tucker <dtucker at dtucker.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dtucker at dtucker.net

--- Comment #1 from Darren Tucker <dtucker at dtucker.net> ---
The OS is specified as Windows: is that the client, the server or both?
 On the Windows side, are you using Cygwin binaries, Microsoft's
binaries or something else?

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https://bugzilla.mindrot.org/show_bug.cgi?id=3772

--- Comment #2 from Jay Martin <sponge_bob_128 at cox.net> ---
Latest cygwin, both machines Windows. But happens with loopback
(scp to itself).

Package              Version                    Status
base-cygwin          3.8-2                        OK
base-files           4.3-3                        OK
crypto-policies      20190218-1                   OK
cygrunsrv            1.64-1                       OK
cygutils             1.4.17-1                     OK
cygwin               3.5.5-1                      OK
libargp              20230708-2                   OK
libattr1             2.5.1-1.20.g0981a7bfe487     OK
libblkid1            2.39.3-2                     OK
libbz2_1             1.0.8-1                      OK
libcom_err2          1.44.5-1                     OK
libcrypt2            4.4.20-1                     OK
libedit0             20221030-4                   OK
libfdisk1            2.39.3-2                     OK
libffi6              3.2.1-2                      OK
libfido2             1.15.0-1                     OK
libgcc1              12.4.0-3                     OK
libgdbm6             1.18.1-1                     OK
libgmp10             6.3.0-1                      OK
libgssapi_krb5_2     1.15.2-2                     OK
libiconv2            1.17-1                       OK
libintl8             0.22.5-1                     OK
libk5crypto3         1.15.2-2                     OK
libkrb5_3            1.15.2-2                     OK
libkrb5support0      1.15.2-2                     OK
liblz4_1             1.9.4-1                      OK
liblzma5             5.6.3-1                      OK
libmpfr6             4.2.1-1                      OK
libncursesw10        6.5+20240427-1               OK
libp11-kit0          0.23.20-1                    OK
libpcre1             8.45-1                       OK
libpcre2_8_0         10.44-1                      OK
libpipeline1         1.5.6-1                      OK
libpopt-common       1.19-1                       OK
libpopt0             1.19-1                       OK
libreadline7         8.2-2                        OK
libsmartcols1        2.39.3-2                     OK
libssl1.1            1.1.1w-1                     OK
libssl3              3.0.15-1                     OK
libstdc++6           12.4.0-3                     OK
libtasn1_6           4.14-1                       OK
libuchardet0         0.0.8-1                      OK
libuuid1             2.39.3-2                     OK
libzstd1             1.5.6-1                      OK
login                1.13-1                       OK
openssh              9.9p1-1                      OK
openssl              3.0.15-1                     OK

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