Probably because I kept using notmuch-emacs .elc code from 0.16 after notmuch got upgraded to 0.17 (I rarely restart emacs), my Emacs interface to notmuch started generating queries that caused Xapian exceptions and segfaults. Here's one: $ notmuch show '( FW: Student Employment Orie.. )' A Xapian exception occurred performing query: Unknown range operation Query string was: ( FW: Student Employment Orie.. ) Segmentation fault Restarting Emacs stopped those queries, so I don't think that's an issue. However, notmuch itself probably should not segfault, even if Xapian gets confused by the .. in the query (making it look like a date range). This is on Debian/i386 with the notmuch 0.17-3 packages. -- -Sanjoy <http://savelongwharfpark.org/> Save Long Wharf Park in Boston Harbor! <http://streetfightingmath.com/> Six reasoning tools to make hard problems easy.