https://bugs.freedesktop.org/show_bug.cgi?id=66955
--- Comment #1 from Phil Armstrong phil@kantaka.co.uk --- Turns out the real problem is that FTL bundles a version of libstdc++ that the DRI drivers won't link against.
It looks like the net result is that *no* DRI drivers (not even swrast) can be loaded, and the Xserver dies when trying to invoke the first GLX call.
Here's the output of the program with LIBGL_DEBUG=verbose :
$ cat libgl_debug-output2.txt libGL: OpenDriver: trying /usr/lib/x86_64-linux-gnu/dri/tls/r600_dri.so libGL: OpenDriver: trying /usr/lib/x86_64-linux-gnu/dri/r600_dri.so libGL error: dlopen /usr/lib/x86_64-linux-gnu/dri/r600_dri.so failed (/home/phil/games/FTL/data/amd64/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /usr/lib/x86_64-linux-gnu/libLLVM-3.2.so.1)) libGL: OpenDriver: trying ${ORIGIN}/dri/tls/r600_dri.so libGL: OpenDriver: trying ${ORIGIN}/dri/r600_dri.so libGL error: dlopen ${ORIGIN}/dri/r600_dri.so failed (/home/phil/games/FTL/data/amd64/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /usr/lib/x86_64-linux-gnu/libLLVM-3.2.so.1)) libGL: OpenDriver: trying /usr/lib/dri/tls/r600_dri.so libGL: OpenDriver: trying /usr/lib/dri/r600_dri.so libGL error: dlopen /usr/lib/dri/r600_dri.so failed (/usr/lib/dri/r600_dri.so: cannot open shared object file: No such file or directory) libGL error: unable to load driver: r600_dri.so libGL error: driver pointer missing libGL error: failed to load driver: r600 libGL: OpenDriver: trying /usr/lib/x86_64-linux-gnu/dri/tls/swrast_dri.so libGL: OpenDriver: trying /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so libGL error: dlopen /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so failed (/home/phil/games/FTL/data/amd64/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /usr/lib/x86_64-linux-gnu/libLLVM-3.2.so.1)) libGL: OpenDriver: trying ${ORIGIN}/dri/tls/swrast_dri.so libGL: OpenDriver: trying ${ORIGIN}/dri/swrast_dri.so libGL error: dlopen ${ORIGIN}/dri/swrast_dri.so failed (/home/phil/games/FTL/data/amd64/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found (required by /usr/lib/x86_64-linux-gnu/libLLVM-3.2.so.1)) libGL: OpenDriver: trying /usr/lib/dri/tls/swrast_dri.so libGL: OpenDriver: trying /usr/lib/dri/swrast_dri.so libGL error: dlopen /usr/lib/dri/swrast_dri.so failed (/usr/lib/dri/swrast_dri.so: cannot open shared object file: No such file or directory) libGL error: unable to load driver: swrast_dri.so libGL error: failed to load driver: swrast XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":3" after 10305 requests (10305 known processed) with 0 events remaining.
If I remove the bundled libstdc++.so & use the system one then everything works as expected.
Obviously this is still an Xorg crash bug though: the server ought not to crash if a userspace program fails to load a glx driver!