http://codereview.appspot.com/196066/diff/1/3
File src/liboslexec/exec.cpp (right):

http://codereview.appspot.com/196066/diff/1/3#newcode345
src/liboslexec/exec.cpp:345: if (debugnan && check_nan (sym, NULL, 0,
m_npoints-1, badval))
Can you pass the original run flags here? Otherwise you are checking
points that might not be valid.

http://codereview.appspot.com/196066/diff/1/3#newcode384
src/liboslexec/exec.cpp:384: if (!get_renderer_userdata (m_npoints,
wants_derivatives,
It would be good to check the results here too.

http://codereview.appspot.com/196066/show