Socket::TCPServer.accept_nonblock accepts non blocking connections ERROR

e$B$-$7$b$H$G$9e(B

e$B<j85$N4D6-!J$3$s$J46$8$G$9!Ke(B

$ uname -a
FreeBSD norikura.localdomain 8.0-STABLE FreeBSD 8.0-STABLE #0 r200622:
Thu Dec 17 14:39:59 JST 2009
[email protected]:/usr/src/sys/amd64/compile/NORIKURA20091217
amd64
$ ruby19 -v
ruby 1.9.2dev (2010-03-18 trunk 26970) [x86_64-freebsd8.0]

e$B$G!"e(BRubySpec e$B$,e(B 1 e$B$D!"e(BERROR e$B$K$J$j$^$9e(B

Socket::TCPServer.accept_nonblock accepts non blocking connections ERROR
Errno::EAGAIN: Resource temporarily unavailable - accept(2) would block
/export/home/ksmakoto/rubyspec/library/socket/tcpserver/accept_nonblock_spec.rb:18:in
accept_nonblock' /export/home/ksmakoto/rubyspec/library/socket/tcpserver/accept_nonblock_spec.rb:18:inblock (2 levels) in <top (required)>’
/export/home/ksmakoto/rubyspec/library/socket/tcpserver/accept_nonblock_spec.rb:4:in
<top (required)>' /usr/local/lib/ruby/gems/1.9.1/gems/mspec-1.5.17/bin/mspec-run:8:in