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Here's an unmerged example, called directly from handle_command():

    def do_post(self, cmd, inbuf):
        try:
            metadata = Module.validate_crash_metadata(inbuf)
        except Exception as e:
            return errno.EINVAL, '', 'malformed crash metadata: %s' % e

        crashid = metadata['crash_id']
        key = 'crash/%s' % crashid
        if self.get_store(key):
            return errno.EADDRINUSE, '', 'crash id %s already saved' % crashid

        self.set_store(key, inbuf)
        return 0, '', 'Posted %s' % crashid

After investigating a bit:

1. Reloading just the CherryPy engine is not implemented.
2. enabling or disabling any module from within a module is not possible.

Maybe it's possible to run execv ourselves?

PR: https://github.com/ceph/ceph/pull/23447