On the version question, 8.3 ships DRBD 9.2.18 right now (that's what kmod-drbd.spec says on the 8.3 branch), so you'd be asking for a single point bump rather than a big jump.
That probably helps you. Of your two links though, I think the netlink crash fix is a 9.2.17 entry, which would mean it's already in what you're running.
The 9.2.19 line that looks closest to your crash to me is the connection-teardown races one rather than the AB-BA deadlock, since a deadlock would hang rather than throw a GPF, but you've read these traces far more closely than I have so correct me if that's backwards.
I can't request a build myself, that's a @Team-Storage call rather than mine, though your post #13 timeline next to those changelog lines is a stronger case than most version-bump requests turn up with.
