If you are using the 32bit compilers, there were issues with the garbage collector for a while, in any case you should always use the 6g 64bit compilers for any serious work, they are much better tested and generate more efficient output.
Other than the issue with the 32bit compilers, I don't remember hearing of any leaks in Go.
Other than the issue with the 32bit compilers, I don't remember hearing of any leaks in Go.