Today I tried to reproduce the panics I ran into yesterday with a recent CURRENT.
I could reproduce my UDP locking issue from kern/48560 and the tcp locking issue from yesterday. Truckman confirmed that the NFS via TCP problem is a known problem and pointed to an alpha patch from Jeffrey Hsu from April.
I also ran into another more serious panic while I umount’ed an NFS exported Filesystem. See my mail to freebsd-current for details. phk categorized it as an evil bug, but did not really felt responsible.
At the moment FreeBSD 5.x sux, and I don’t see this changing in the near future….:-(