malloc producing SIGTRAP error

Question

char *word = malloc(sizeof(char) * (pos + 1));

is producing an SIGTRAP error. pos is an int.

How do I know this is the line? Process of elimination with break points.

I searched and did not find any information on this function producing this error. What should I do?

[see here](http://stackoverflow.com/questions/3475262/what-causes-a-sigtrap-in-a-debug-session) — M.M, Oct 12 '14 at 04:41
How do I find what might have corrupted the heap? I'm using windows and codelite IDE. — Thomas, Oct 12 '14 at 04:43
"*How do I find what might have corrupted the heap?*" Run your program using a memory checker. I'd recommend Valgrind (http://valgrind.org), but am not sure whether it's available on you platfrom. — alk, Oct 12 '14 at 11:06
Also^2 `malloc()` takes a `size_t` (which is unsigned) as argument, not an `int`. Saying this, could by any chance the `pos - 1` in your source had evaluated to a negative value, that is `pos` had been `<=0`? — alk, Oct 12 '14 at 11:10

score 2 · Accepted Answer · edited May 23 '17 at 12:28

There are many memory debuggers available on Windows (though I haven't tried them by myself):

Is there a good Valgrind substitute for Windows?

I'd recommend you to try Application Verifier from MS:

http://msdn.microsoft.com/en-us/library/windows/desktop/dd371695(v=vs.85).aspx

It should be able to catch heap corruption.

But before you start relying on such a large and complicated software, you can simply printf the value of arguments to malloc() and free() at all places. You will find something odd in the output.

malloc producing SIGTRAP error

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