I've been looking at the HAMMER code a bit. It seems the mount will hang the kernel at recovery time if the tail of a undo record contains a zero size. I've been told the filesystem is implicitly trusted, but I think a failed assert would be better than the stuck while loop.
I have a small disk image to illustrate the hang at: http://leaf.dragonflybsd.org/~dion/hammer.small.bz2 This obviously isn't a high priority, but I'm interested in hearing opinions on it (does this kind of bug interest us?). -- Dion
