All network compiled by default are in, threads support is in too.
Edonkey, Overnet and Bittorrent are the only one switched on.
Even if the crashes occurs in the Ocaml garbage collector, it is
probably a previous error in the C code. Since the code for md4
computation has been tested a lot, the crash either comes from the C
code related to threads, or from the code used for sha1 computation.
Do you have some bittorrent files downloading, or the plugin is
enabled but not used ? It would limit the search to the
threads-related code...