This code cause segmentation fault inside table.sort on OSX and Linux (Ubuntu) luajit 2.1 --------------------------------------------------------------------------------- local ffi = require ("ffi") local cdef = [[ typedef struct { double value; } some_struct; ]] ffi.cdef(cdef) local fn = function() local sorted = {} local any_struct_ffi = ffi.new("some_struct[?]", 10) for i=0, 10 do sorted[i] = 10-i any_struct_ffi[i].value = i end return function() table.sort(sorted) end end local ss = fn() for i=0,3000000 do ss() end ---------------------------------------------------------------------------------