Hi, Looks like after your change to libpthread/sem.c, python2[34] core dumps when starting xend (required for NetBSD/Xen). backtraces for python23 and python24 from pkgsrc: http://www.xtrarom.org/pthread_python2.3.txt http://www.xtrarom.org/pthread_python2.4.txt Reverting to 1.7 seems to work again. !DSPAM:9,4354b8865521687920366!