[lbrandy]

For uninitialized memory reads, which is one of the biggest classes of issues, valgrind can still be invaluable. MSAN is one of the more difficult things to get setup and remove all the false positives. You typically need to transitively compile everything including dependencies, or annotate/hint lots of things to get the signal-to-noise ratio right. Sometimes its just easier/better/faster to run it under valgrind.