On Sun, 29 Jan 2006 02:19:53 -0500
Thor Lancelot Simon <tls@rek.tjls.com> wrote:

> On Sat, Jan 28, 2006 at 01:58:53AM +0000, segv@netctl.net wrote:
> > Hi, I have a script that sets up a chroot environment under /opt/sandbox by
> > calling 'mount_null' to
> > mount /bin, /sbin, /lib, /usr/bin, /usr/sbin, /usr/lib, etc
> > under /opt/sandbox. When some of the directories are exported via NFS and I
> > call this scripts on the server that exports those directories, I get a
> > kernel panic. This is on a pretty recent NetBSD-current.
> > 
> > uvm_fault(0xcace89a0, 0, 0, 1) -> 0xe
> > kernel: supervisor trap page fault, code = 0
> > Stopped in pid 543.1 (mountd) at 0: invalid address
> 
> I've seen a huge number of these on multiprocessor machines -- you mention
> in a later message that your system has two CPUs.  Our quad-CPU build
> systems see them very frequently, while our dual-CPU systems see them
> hardly at all.
> 
> It's been suggested that these are memory errors -- that is, hardware
> failures -- but I can't see any other evidence that the memory in these
> systems is bad.  I think we must have some kind of race in the VM system.
> 

I don't think it's faulty memory, because:

1. I've put in a brand new memory module from Crucial just a few days ago
2. It only happens when I have NFS server daemons running, whithout them
everything is OK.