Where to raise an issue for the stm library

Can someone tell me where to raise an issue for the stm library? The hackage link sends me here http://git.haskell.org/packages/stm.git. But this page provides no clue on raising issues. I wondered if GHC trac itself is used for this library. I saw some other libraries in the drop down list but not this one in the GHC trac ticket creation page. It is frustrating that figuring out how to raise an issue is not easy for such an important library. -harendra