Electric Fence is a different kind of malloc debugger
Description:
It uses the virtual memory hardware of your system to detect when software overruns the boundaries of a malloc buffer. It will also detect any accesses of memory that has been released by free. Because it uses the VM hardware for detection, Electric Fence stops your program on the first instruction that causes a bounds violation. It's then trivial to use a debugger to display the offending statement. Author has tested it on HPUX 9.01.