Comment 11 for bug 1450562

Thanks Emil! Unfortunaltey I am not familiar with Optimus nor do I have appropriate hardware.

Could someone provide a backtrace (with symbols) of the binary which ends up saying "malloc: unknown:0: assertion botched", etc? Or maybe even Valgrind it? Although that may be pretty advanced.

I don't think this commit is the actual culprit, but it is possible that the failing binary uses UserPtr if it detects it, and has a bug in those optional code paths.

Another interesting test would be to try non-working libdrm on a kernel without UserPtr support.