Re: Exit code 255 after large clone (32-bit PowerPC)

"brian m. carlson" [off-list ref] writes:

That message comes from OpenSSH.  I've seen it quite frequently in
various other (non-Git) cases.  I think it's fair for us to exit
unsuccessfully if OpenSSH exits unsuccessfully in this case.  For
example, an attacker could try to tamper with the connection and send
additional data, which OpenSSH would detect and exit unsuccessfully for.
We also in general need to detect truncation attacks, which OpenSSH will
do for us here.

It's possible that if there's an older version of OpenSSH being used,
that the problem happens to be related to a bug of some sort.  There
were some versions which had various bugs that could be triggered by a
rekey, which, if the threshold is set low enough, could be the cause of
this particular problem.

I think the fact that it's not being seen with HTTPS is the ultimate
clue here.

This suspiously sounds familiar.  Asking for "close ssh connection"
in the lore.kernel.org archive finds this:

  https://lore.kernel.org/git/YKTg8nYjSGpKbq8W@coredump.intra.peff.net/ (local)