smb@research.att.com (Steven M. Bellovin) writes:
> Interesting -- I had suspected something thread-related, because the 
> it's not just the downloads that hang; I can't kill tabs or windows, or 
> get to any menus.
>
> Hmm -- is the resolver it's using thread-safe?

FYI.  I'm using stock current.  Looking at res_send.c:send_dg() I
don't immediately see anything that looks like a LOCK()/UNLOCK()
around where it opens a new socket and where it uses it.  Hopefully
someone that understands this will point out that there is implied
locking because threads can't switch on certain kernel-calls or
something like that.

-wolfgang