https://bugs.freedesktop.org/show_bug.cgi?id=66349
--- Comment #8 from Vadim Girlin ptpzz@yandex.ru --- So far I haven't managed to reproduce the issue with the trace, I tried with 32-bit and 64-bit drivers, with and without sb, also I tried to build mesa with your configure parameters (though I had to adjust them a bit to make it work for me) - I haven't seen any segfaults with the trace, valgrind doesn't provide any hints either.
I suspect it may be something specific to your configuration, compiler version, etc.