Basically, elog hangs up by the visit of googlebot.
Googlebot repeatedly tries to obtain all (!) of entries by specifying "page0" and "mode=full".
Elogd seems not to have the way to block an access from the specified IP.
We might be able to use http-proxy via apache. (c.f. http://midas.psi.ch/elog/adminguide.html#secure)
Or can we tweak the source of elod such that it does not accept "page0"?
GET /40m/page0?mode=full&new_entries=1 HTTP/1.1
User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Elog was hanging. Restarted it with script.