Ok, found the culprit. It's here:
https://github.com/xrootd/xrootd/blob/master/src/XrdXrootd/XrdXrootdTransit.cc#L418
If a stall occurs (you can tweak the XrdOfsHandle::WaitLock code to never wait and this causes a stall easily), then the XrdXrootdProtocol object is scheduled to re-run at a later point. It's re-run in that function.
However, it doesn't appear to invoke the appropriate callback for realProt->Process as in the other overload of XrdXrootdTransit::Process, meaning the callback doesn't get pushed until the client itself causes activity (such as disconnecting).
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