Did we break receive-pack recently?

I just saw this:

    $ git push ko
    ko: Counting objects: 332, done.
    Delta compression using up to 4 threads.
    Compressing objects: 100% (110/110), done.
    Writing objects: 100% (130/130), 32.27 KiB, done.
    Total 130 (delta 106), reused 21 (delta 20)
    Auto packing the repository for optimum performance.
    fatal: protocol error: bad line length character: Remo
    error: error in sideband demultiplexer
    To ra.kernel.org:/pub/scm/git/git.git
    ...

What is unusual with this push is that it happened to trigger the
auto-gc on the receiving end and the message "Auto packing the
repository..." came back to the pusher just fine, but somebody
nearby seem to have tried to say "Remo"(te---probably) without
properly using the sideband.

Does this ring a bell to anybody?