I suppose we didn't really envisage alternative SCTP stacks when the DLM was written and it's never come up as a problem before.
Thanks for the prompt response. I am surprised. SCTP is used as the underlying transport for a bunch of interfaces/nodes in telecom networks and I believe userspace sctp stacks are common there. Many of these products run on RHEL. So I should not be the first one to hit this. Strange.