this is a known problem with 1.5, see PR 11247.
(it's fixed in -current)

-Chuck


On Fri, Dec 15, 2000 at 06:01:39PM +0000, Nick Hudson wrote:
> Dave Huang wrote:
> > 
> > On Fri, 15 Dec 2000, Nick Hudson wrote:
> > > Simon Burge wrote:
> > > > I see a core dump from tail when I try to tail a large (in this
> > > > case 12MB) file that's on a nullfs mount.  I can tail a file on
> > > > the underlying filesystem fine.  Are you using nullfs mounts?
> > >
> > > Actually, yes. It always cored when the file was being written to, but now it doesn't.
> > 
> > Using a -current kernel (with UBC)? mmap() is broken on some
> > filesystems...
> > http://mail-index.netbsd.org/current-users/2000/12/14/0001.html
> > (I guess nullfs is on the list of bad filesystems too)...
> 
> I'm running 1.5. Sorry should have said this to begin with
> 
> NetBSD go61923 1.5 NetBSD 1.5 (GO61923) #0: Tue Nov 21 16:17:23 GMT 2000    
> nick@kenny:/dsk/NetBSD/NetBSD-1.5/src/sys/arch/i386/compile/GO61923 i386
> 
> Nick
> -- 
> aka skrll@netbsd.org, skrll@excite.co.uk