AddressSanitizer (ASan) is a fast memory error detector.
It finds use-after-free and {heap,stack,global}-buffer overflow bugs in C/C++ programs.
Learn more:

• AddressSanitizer -- how to use the tool.
• AddressSanitizer page at clang.llvm.org
• AddressSanitizerAlgorithm -- how it works.
• Read if you are working on Chromium
• Watch the presentation from the LLVM Developer's meeting (Nov 18, 2011): Video, slides.
• Our paper accepted to USENIX ATC 2012

Your comments are welcome at address-sanitizer@googlegroups.com or in Google+