Thread: What does this error mean? double free or corruption

Hey ~ everyone~
What does this error mean?
*** glibc detected *** double free or corruption (!prev):

It occurs when i tried to write to a file like this :

Code:

Write2DArrayInt(tcumulus, ncolumns,nrows, out);

Write2DArrayInt is a function like this:

void Write2DArrayInt(short int **Array, int Columns, int Rows, FILE
*fp)
{

int i;

for(i=0; i<Rows; i++){
fwrite(Array[i], sizeof(short int),Columns, fp);
}
fclose(fp);

}

You stomped on memory somewhere, or freed something twice. Without seeing a complete program it's hard to say what, exactly, the problem is. Since you appear to be on Linux, I'd recommend Valgrind. It's a great debugger that will tell you all sorts of places you made a mistake, even if your program doesn't crash at that point. It should help narrow down problems. gdb, of course, is also a useful tool.

BTW, where is your file "opened" for writing?