[Vala] How to use vala Linux.backtrace?

[Christian Johnson <_c_ mail com>]

Hey!

I'm trying to print out stacktrace, Linux.backtrace and
Linux.backtrace_symbols look like they would work but them being part of
libc I can't seam to discover how to use them from vala. The GNU manual has
this example:

void *array[10];
size_t size;
char **strings;
size_t i;

size = backtrace (array, 10);
strings = backtrace_symbols (array, size);
     
printf ("Obtained %zd stack frames.\n", size);
     
for (i = 0; i < size; i++)
     printf ("%s\n", strings[i]);
     
free (strings);

So trying to convert this to vala:

void[] array = new void[10];
int size = Linux.backtrace (&array, 10);
string[] strings = Linux.backtrace_symbols (array, size);

foreach (string trace in strings) {
    stdout.printf("%s\n", trace);
}

This produces the fallow error:
*** Error in `valac': munmap_chunk(): invalid pointer: 0xb76d1069 ***


So...What am I doing wrong?