> apache2: 2.4.56-1~deb11u2, prefork MPM, mod_perl

I think it's a large window on prefork where this can happen.  If any
process is busy processing a request, it cannot close its copy of the
listening socket. The OS will continue to complete TCP connections and
acknowledge (some) data with nobody calling accept().  When the last
of the listening sockets is finally closed, the TCP connections that
arrived in this timeframe will be abruptly closed.

Both worker and event MPMs have a dedicated listener thread per child
process, so it will close those copies of the listening sockets much
more quickly.

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