https://bugs.freedesktop.org/show_bug.cgi?id=48305
--- Comment #6 from Michel Dänzer michel@daenzer.net 2012-04-05 06:48:04 UTC --- (In reply to comment #5)
After playing with compilation flags to get meaningful backtrace I found that this segfault happens only with -O3… Dunno if this is considered as a bug.
It's a bug *somewhere*, but it looks like it could be in the compiler... Maybe you can try isolating which specific option implied by -O3 but not by -O2 makes the difference.