IMAP server restart crashes sup

this very bizarre backtrace:

--- SystemExit from thread: main closed stream /usr/lib/ruby/1.8/openssl/buffering.rb:237:in `select' ./lib/sup/buffer.rb:31:in `nonblocking_getch' bin/sup:227

wtf?

There's no reason that nonblocking_getch would be calling the openssl stuff, and openssl's buffering.rb doesn't mention select at all. Weird.