Hmmm I managed to get the segfault a few times. Now I've built a debug version and it's been running for a couple of hours now without segfaulting. I'll leave it running overnight to see if I can get anything but it's always possible that we have an Eisenbug.

Is there anyone out there who's comfortable running gdb and reporting back if they can reproduce the problem? Even better, if anyone knows how to get a core dump on the N900 then you could just send it to me.