Created attachment 412942 [details]
A patch to enable xstate ptrace
kernel-126.96.36.199-85.fc13 doesn't support xstate ptrace.
I can't debug AVX programs on my Sandy Bridge machine
with gdb-7.1-18.fc13.x86_64 which supports xstate pptrace.
I have been using this patch backported from 2.6.34
and it works for me.
It's a 2.6.34 feature, and we'll have a 2.6.34 kernel soon enough.