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I had the same problem on frebsd6.2 when i tried to load all the extensions in php 5.1.6. My guess is the problem is the panda extension.
This is my *working* extensions.ini file, maybe it helps:

extension=session.so
extension=recode.so

extension=soap.so
extension=wddx.so

extension=bcmath.so
extension=bz2.so
extension=calendar.so
extension=ctype.so
extension=curl.so
extension=dba.so
extension=dbase.so
extension=dom.so
extension=exif.so
extension=fileinfo.so
extension=filepro.so
extension=fribidi.so
extension=ftp.so
extension=gd.so
extension=gettext.so
extension=gmp.so
extension=iconv.so
extension=imap.so
extension=interbase.so
extension=ldap.so
extension=mbstring.so
extension=mcrypt.so
extension=mhash.so
extension=ming.so
extension=mssql.so
extension=mysql.so
extension=mysqli.so
extension=ncurses.so
extension=odbc.so
extension=openssl.so
extension=pcntl.so
extension=pcre.so
extension=pdf.so
extension=zlib.so
extension=pdo.so
extension=pgsql.so
extension=posix.so
extension=pspell.so
extension=readline.so
extension=shmop.so
extension=simplexml.so
extension=snmp.so
extension=sockets.so
extension=sqlite.so
extension=sybase_ct.so
extension=sysvmsg.so
extension=sysvsem.so
extension=sysvshm.so
extension=tokenizer.so
extension=xml.so
extension=xmlreader.so
extension=xmlrpc.so
extension=xmlwriter.so
extension=xsl.so

;; generates segfault
;extension=yaz.so
;; generates segfault
;extension=panda.so

extension=zip.so

The soap and wddx extensions fail to load if placed in the alphabetical order of the extensions. Moved them to top and they load siccessfuly.
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