I'm currently developing a Grilo plugin for Tracker. Grilo being a framework to access multimedia content over various sources, I'm using Tracker to search content over various indexed sources (USB keys, local drive, UPnP servers, etc...).

More recently, I added notification support to take into account the newly indexed files. That work is hosted here :

http://git.gnome.org/browse/grilo-plugins/log/?h=tracker-notification

And started to experience strange crashes with backtraces deep inside sqlite code like the one attached. I first though to a memory corruption within my code. But valgrind didn't show anything. And that was definitely confirmed by the fact that when launching my application with the dbus backend, I don't experience crash anymore.

Also, as pointed out by Aleksander, compiling Sqlite with -DSQLITE_OMIT_LOOKASIDE=1 prevent crashes.

So basicly a good way to reproduce is :
   - compile grilo and grilo-plugins (from tracker-notification branch, with --enable-tracker) packages
   - launch grilo-test-ui tool (from grilo package).
   - launch tracker-control -k -r && tracker-control -s

To reproduce the bug you need to have a sufficiently big enough amount of files to be indexed, to ensure enough allocations will be made in Sqlite. Running the grilo-test-ui under Valgrind seems to slow down the application enough to not experience the crashes anymore.