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Seems like a bug with libffi trampolines, any code using callbacks crash on x64. I know Python's ctypes uses libffi too, I will check if they have an workaround later.

Fabio Mascarenhas

On Feb 13, 2008 6:35 AM, Thomas Harning <> wrote:
Fabio Mascarenhas wrote:Just a note: on AMD64 it appears that test_libc.lua works.
The normal tests do not, though... it segfaults @ _testfunc_callback_i_if ()

#0  0x00000000005157e8 in ?? ()
#1  0x00002ae74fc98544 in _testfunc_callback_i_if (value=262144,
   at tests/alientest.c:155
#2  0x00002ae74f88fbe0 in ffi_call_unix64 () from
#3  0x00002ae74f88f629 in ffi_call (cif=0x7fff5b247810,
   fn=0x2ae74fc98530 <_testfunc_callback_i_if>, rvalue=0x7fff5b24784c,
   avalue=0x7fff5b2477a0) at src/x86/ffi64.c:428
#4  0x00002ae74f88e74b in alien_function_call () from

Tried tracking it down to make sense of it...  it almost looks like the
function address is being truncated to 32-bits...