We'll be doing some pseudo-emergency maintenance on the Bugzilla installation on the LLVM server this afternoon (basically moving files to a larger partition to avoid further disruptions of service). As this will be done by our IT staff, I don't know exactly when they will commence, but for now, just don't use Bugzilla even if it appears to be up.
I'll have our IT people send me email when the work is done, and I'll forward that information to llvmdev.
Sorry for the inconvenience.
-- John T.