NFS deadlocks are not unique to AIX. I've seen NFS in the state where any attempt to touch it locks up the process doing it (in the state where it can't even be

NFS deadlocks are not unique to AIX. I've seen NFS in the state where any attempt to touch it locks up the process doing it (in the state where it can't even be killed - yes, the 'D' state) and if you need something from that process, good luck - reboot is pretty much the only way out. Nowdays, I think, NFS drivers in Linux became a bit saner but before that, if you get D's on NFS, you're out of luck.