i've started to see this problem after upgrading to version 5.3.1-4 of this package. it's very easy to reproduce, just by browsing around one of my wordpress sites. i see the following in my syslog:
Feb 21 13:28:55 farc kernel: [9642819.574930] php-cgi[18295]: segfault at 1000721 ip 0000000000698277 sp 00007fff5b86a270 error 4 in php5-cgi[400000+6fe000] -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
