xen3-dom0 crashed by using NFS mounted image file for domU

[Kazushi (Jam) Marukawa <jam%pobox.com@localhost>]

Hi there,

When I tried to run netbsd image on NFS mounted as xen3
domU, the xen3 dom0 netbsd was crashed.  I'm using 10/30
version of current 4.99.3.  This happens often when I try to
use NFS mounted image as domU.

It is not so bad if this happens only if I use NFS mounted
images.  However, similar things happen rarely on a dom0
netbsd working as NFS and domU server but not using NFS
mounted images.  So, I reall want to get this problem fixed.

Is there anything that I should try?  Or should I just do
send-pr?  Thanks.


Crash log:

# xm create -c sou
Using config file "sou".
/usr/pkg/lib/python2.4/xmllib.py:9: DeprecationWarning: The xmllib module is 
obsolete.  Use xml.sax instead.
  warnings.warn("The xmllib module is obsolete.  Use xml.sax instead.", 
DeprecationWarning)
Started domain sou
Loaded initial symtab at 0xc047995c, strtab at 0xc04a5868, # entries 11176
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 4.99.3 (XEN3_DOMU) #2: Tue Oct 31 22:38:30 JST 2006
<...>
swapctl: adding /dev/xbd0b as swap device at priority 0
Checking for botched superblock upgrades: done.
Starting file system checks:
/dev/rxbd0a: file system is clean; not checking
panic: kernel diagnostic assertion "pg != NULL" failed: file 
"/mnt/raid/netbsd/current/src/sys/uvm/uvm_pager.c", line 499
Stopped in pid 371.1 (nfsio) at netbsd:cpu_Debugger+0x4:        popl    %ebp
db> trace
cpu_Debugger(c08456da,c9178ab8,6,0,0) at netbsd:cpu_Debugger+0x4
panic(c08a61f0,c080ee61,c08219ff,c0873604,1f3) at netbsd:panic+0x155
__assert(c080ee61,c0873604,1f3,c08219ff,c9178b1c) at netbsd:__assert+0x2e
uvm_pageratop(c8762000,1,0,0,29900000) at netbsd:uvm_pageratop+0x63
nfs_doio_write(c9178bf0,0,0,0,0) at netbsd:nfs_doio_write+0xda
nfs_doio(c0c2daa8,320,c081eff0,0,c0938480) at netbsd:nfs_doio+0x1c0
nfssvc_iod(c864d250,0,0,c010200d,c864d250) at netbsd:nfssvc_iod+0xce
start_nfsio(c864d250,0,c01001e7,c01001df,c01001e7) at netbsd:start_nfsio+0x13
db>

-- Kazushi
Outside of a dog, a book is a man's best friend: and inside a dog,
it's too dark to read.
                -- Groucho Marx