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
> db{0}>bt

Is it on i386?
if it is, please try  "bt $ebp" instead.  Do it with a kernel compiled
with debugging symbols ( makeoptions DEBUG="-g"). Also try to save crash
dump with "reboot 0x104" after you are done in ddb.

Pavel