NBD 2.9.1
I released the userland NBD tools of version 2.9.1 today, incorporating a fix for a minor memory leak (it would allocate memory for a hash table for each and every port on which nbd-server was going to listen, rather than just once for the entire server), and a fix for some piece of code which followed a null pointer (I had actually found that bug earlier, but forgot to commit the fix up to now). These were minor, but important, changes.
Of course only now do I see the mails from Mike Frysing (the Gentoo maintainer for the userland NBD tools) containing a number of build fixes. Had I seen them earlier, I could obviously have included them in the 2.9.1 release. Ghaah!
Lesson learned: check your mailbox before doing an NBD release.
Oh well.
On a side note, there's a pretty annoying and disgusting heisenbug in nbd-server, involving reliability. If you know stuff about mutexes (I don't) and are willing to help, here's a chance to be my personal hero.