00143990 t wait_for_tcp_memory
00143a40 t do_tcp_sendmsg
001444b0 t tcp_sendmsg <------------- here
001445d0 T tcp_read_wakeup
00144890 t tcp_recv_urg
00144a60 t cleanup_rbuf
it was during Sendmail 8.6.12/8.6.9 receive operations, kernel 1.3.71.
no such message in 1.3.68. Not reproducable :(
-- mingo