Jarkko> sa_switch(2886.6 flag 900004): Not enough stacks.

To get around, put following line on /etc/mk.conf,
(if you make on pkgsrc).
---------------------------
.ifdef BSD_PKG_MK
PREFER_NATIVE_PTHREADS=NO
.endif
---------------------------
But I do not recommend to do that, not being able to 
debug the native-pthread facility.

I got the same problem on net/bind9, bind-9.2.2.
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Makoto Fujiwara, 
Chiba, Japan, Narita Airport and Disneyland prefecture.