In message <20040221170100.GE661@goldberry.poofy.goof.com>, "Aaron J. Grier" wr
ites:
>On Fri, Feb 20, 2004 at 01:31:54PM -0800, Wolfgang S. Rupprecht wrote:
>> 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.
>
>as another data point, I see similar behaviour in mozilla 1.6 from
>pkgsrc under 1.6.1.  however, MozillaFirebird compiled from the same
>day's CVS of pkgsrc works fine.
>

The problem does indeed seem to be related to locking in Mozilla 1.6.  
Kouichirou Hiratsuka's solution (see
http://mail-index.netbsd.org/tech-pkg/2004/02/20/0001.html ) seems to 
have solved the problem for me.

		--Steve Bellovin, http://www.research.att.com/~smb