kern/46031: fatal page fault in supervisor mode on AWS/xen

[bvanzant%clovetree.com@localhost]

>Number:         46031
>Category:       kern
>Synopsis:       fatal page fault in supervisor mode on AWS/xen
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Feb 16 21:00:00 +0000 2012
>Originator:     Bob Van Zant
>Release:        5.1-stable
>Organization:
Clovetree
>Environment:
AWS AMI: NetBSD-5.1 (ami-2da67644)
NetBSD ip-10-118-62-112.ec2.internal 5.1_STABLE NetBSD 5.1_STABLE (XEN3_DOMU) 
#0: Sun Feb  5 04:48:49 CET 2012  
jym@paris:/home/jym/cvs/nb5/obj/sys/arch/amd64/compile/XEN3_DOMU amd64
>Description:
Output from "get system log" on AWS.

uvm_fault(0xffffffff805d7340, 0xffffffff81400000, 1) -> e

fatal page fault in supervisor mode

trap type 6 code 0 rip ffffffff803854bb cs e030 rflags 10282 cr2  
ffffffff81400ff8 cpl 0 rsp ffffa00057d53710

panic: trap

Begin traceback...

uvm_fault(0xffffa0005629eb88, 0x0, 1) -> e

fatal page fault in supervisor mode

trap type 6 code 0 rip ffffffff8037f33c cs e030 rflags 10246 cr2  0 cpl 0 rsp 
ffffa00057d532c0

panic: trap

Faulted in mid-traceback; aborting...

dump to dev 142,17 not possible

rebooting...

>How-To-Repeat:
I had mounted a 20GB EBS volume on /usr/src (filesystem type is BSD4.2). The 
disk label from the EBS volume (/dev/xbd2) was:

5 partitions:
#        size    offset     fstype [fsize bsize cpg/sgs]
 a:  39845888      2048     4.2BSD      0     0     0  # (Cyl.      1 -  19456)
 c:  41942977        63     unused      0     0        # (Cyl.      0*-  20479)
 d:  41943040         0     unused      0     0        # (Cyl.      0 -  20479)
 e:   2095104  39847936     4.2BSD      0     0     0  # (Cyl.  19457 -  20479)

Once in /usr/src I followed instructions for checkout out the netbsd source 
from CVS (http://netbsd.org/docs/guide/en/chap-fetch.html). During the initial 
checkout (several minutes in) my ssh connection failed. After several minutes I 
found what I pasted into the "full description" box.

On reboot this machine ended up with an fsck failure and had to be put down.

>Fix: