VERY strange stack overflow in C++ program
- by mav
Hello,
I wrote a program some time ago (Mac OS X, C++, SDL, FMOD) and it perfomed rather good. But lately I wanted to extend its functionality and added some more code to it. And now, when I run it and try to test the new functionality, the program crashes with SIGABRT.
Looking into debugger, on function stack I see:
_kill
kill$UNIX2003
raise
__abort
__stack_chk_fail
odtworz <-- my function that was was modified
As far as I know, "__stack_chk_fail" indicates a stack overflow. But that's not the weirdest thing about it. In this function "odtworz", I have some code like this:
...
koniec = 0;
while ( koniec == 0 ) {
...
if (mode == 1) {
...
}
else if (mode == 2) {
...
}
else if (mode == 3) {
...
}
}
mode is a global variable and is set to value "2" in a function before. And now imagine - if I delete the third if statement (mode == 3) which never gets executed in this mode, the program doesn't crash! Deleting code that doesn't even get to be executed helps the situation!
Now, I don't want to delete this code because it's for other mode of my program. And it works fine there. So any hints where I can search? What could be possibly wrong with this?
