In article <418922C0.50800@boogers.sf.ca.us>,
	Jeff Rizzo <riz@boogers.sf.ca.us> writes:
> unmounting file systems...
> unmounting /amd/boogers/work (boogers:/work)...panic: kernel diagnostic 
> assertio
> n "np->n_dirgens == NULL" failed: file "../../../../nfs/nfs_node.c", 
> line 312
> Stopped in pid 5226.1 (reboot) at       netbsd:breakpoint+0x4:  leave
> db> trace
> breakpoint(c056a398,d3d2bca8,d3d2bc9c,c0343e1e,d3d2bca8) at 
> netbsd:breakpoint+0x
> 4
> cpu_Debugger(d3d2bca8,104,d3d2bccc,c0517683,c0607e20) at 
> netbsd:cpu_Debugger+0xb

That's PR kern/25021: Kernel panic in NFS code during system shutdown.

Did your NFS server reboot while the the above system was up?

	Kind regards
 
-- 
Matthias Scheler                                  http://scheler.de/~matthias/