ISO C standard as to say about va_list on 7.15 [#3]

       If  access  to  the varying arguments is desired, the called
       function shall declare an object (referred to as ap in  this
       subclause) having type va_list.  The object ap may be passed
       as an argument to another function; if that function invokes
       the  va_arg  macro with parameter ap, the value of ap in the
       calling function is indeterminate and shall be passed to the
       va_end macro prior to any further reference to ap.199)

Which interprets to do reuse a va_list that was already processed.
Instead, use a copy. This fixes crashes on x86-64 and debugging
feasible, since logging is now available. ;-)

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