kern/43650: NetBSD 5.0.2 DomU crashes on bigger file operations

[bbartlomiej%gmail.com@localhost]

>Number:         43650
>Category:       kern
>Synopsis:       NetBSD 5.0.2 DomU crashes on bigger file operations
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Wed Jul 21 19:30:00 +0000 2010
>Originator:     Bartek Krawczyk
>Release:        5.0.2
>Organization:
>Environment:
NetBSD netbsd.pentaxian.pl 5.0.2 NetBSD 5.0.2 (XEN3PAE_DOMU) #0: Sat Feb  6 
17:52:02 UTC 2010  
builds%b7.netbsd.org@localhost:/home/builds/ab/netbsd-5-0-2-RELEASE/i386/201002061851Z-obj/home/builds/ab/netbsd-5-0-2-RELEASE/src/sys/arch/i386/compile/XEN3PAE_DOMU
 i386

>Description:
When doing some more intensive filesystem work (e.g. compiling from pkgsrc or 
copying a directory with lots of files in it) NetBSD domU panics. It doesn't 
matter if I enable softdep or not. This is what i get on "xm console" on Dom0 
(which is a Debian Stable):


panic: xen_failsafe_handler called!

Begin traceback...
uvm_fault(0xc9e18000, 0x7000, 1) -> 0xe
fatal page fault in supervisor mode
trap type 6 code 0 eip c0397531 cs 9 eflags 10246 cr2 7ff0 ilevel 6
panic: trap
Faulted in mid-traceback; aborting...
dump to dev 142,9 not possible
rebooting...

I am running this on debian:
xen-3.2-1-i386.gz
2.6.26-2-xen-686

>How-To-Repeat:
Install NetBSD DomU on Linux Dom0 with PAE. 
Do some intensive filesystem work on NetBSD.
>Fix: