port-xen/46313: xen instance throws evtchn_do_event: handler 0xffffffff80120c17 didn't lower ipl 8 7

[root%admin.warped.com@localhost (Charlie Root)]

        Note: There was a bad value `' for the field `Class'.
        It was set to the default value of `sw-bug'.

        Note: There was a bad value `' for the field `Priority'.
        It was set to the default value of `medium'.

        Note: There was a bad value `' for the field `Severity'.
        It was set to the default value of `serious'.

>Number:         46313
>Category:       port-xen
>Synopsis:       xen instance throws evtchn_do_event: handler 
>0xffffffff80120c17 didn't lower ipl 8 7
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-xen-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Apr 09 00:00:00 +0000 2012
>Originator:     Charlie Root
>Release:        NetBSD 6.0_BETA
>Organization:
        
>Environment:
        
        
System: NetBSD admin.warped.com 6.0_BETA NetBSD 6.0_BETA (XEN3_DOMU) amd64
Architecture: x86_64
Machine: amd64

root@epsilon:/etc/xen/configs# xm info
host                   : epsilon
release                : 2.6.32-5-xen-amd64
version                : #1 SMP Thu Nov 3 05:42:31 UTC 2011
machine                : x86_64
nr_cpus                : 8
nr_nodes               : 2
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2133
hw_caps                : 
bfebfbff:2c100800:00000000:00001f40:029ee3ff:00000000:00000001:00000000
virt_caps              : hvm hvm_directio
total_memory           : 24566
free_memory            : 5132
node_to_cpu            : node0:0-3
                         node1:4-7
node_to_memory         : node0:799
                         node1:4333
node_to_dma32_mem      : node0:52
                         node1:0
max_node_id            : 1
xen_major              : 4
xen_minor              : 0
xen_extra              : .1
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 
hvm-3.0-x86_32p hvm-3.0-x86_64 
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
xen_commandline        : placeholder
cc_compiler            : gcc version 4.4.5 (Debian 4.4.5-8) 
cc_compile_by          : waldi
cc_compile_domain      : debian.org
cc_compile_date        : Sun Nov  6 09:42:15 CET 2011
xend_config_format     : 4

>Description:
        
Apr  8 15:15:23 admin /netbsd: evtchn_do_event: handler 0xffffffff80120c17 
didn't lower ipl 8 7

This is also repeatable with running Xen under VMWare with linux dom0 and amd64 
domu (my original testbed).

>How-To-Repeat:
I get this during cvs checkout of pkgsrc or building a package (might be disk 
or net related?)
        
>Fix:
        

>Unformatted:
 From: billc%netbsd.org@localhost
 Reply-To: billc%netbsd.org@localhost
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