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kern/48770: XenServer 6.2 cannot boot NetBSD 5, 6 or -current as HVM

>Number:         48770
>Category:       kern
>Synopsis:       XenServer 6.2 cannot boot NetBSD 5, 6 or -current as HVM
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 29 15:10:00 +0000 2014
>Originator:     Stephen Borrill
>Release:        NetBSD-current 29/4/14
Trying to boot any supported version of NetBSD as an HVM domU on XenServer 6.2 
fails due to a 'ghost' hard drive:

wd1 at atabus1 drive 0
wd1: <ST506>
wd1: 69632 KB, 1024 cyl, 8 head, 17 sec, 512 bytes/sect x 139264 sectors
wdc1:0:0: lost interrupt
        type: ata tc_bcount: 512 tc_skip:0
wd1d: device timeout reading fsbn 0 (wd1 bn 0; cn 0 tn 0 sn 0), retrying

Last 2 lines repeat.

Rogue device is actually the virtual CD drive (but appearing as wd device with 
incorrect geometry). Geometry is same even if virtual CD drive is empty.

Deleting the virtual CD device will stop the hang, but means you can't use the 
CD to install the OS, of course. Should be OK for OS installed previously:

root@xenserver1 ~]# xe vbd-list vm-uuid=c1352fd1-b3d8-799b-1b84-9aa0d69bf317 
uuid ( RO)             : dbb6f49e-9b47-03fc-fd41-460bc03626e8
          vm-uuid ( RO): c1352fd1-b3d8-799b-1b84-9aa0d69bf317
    vm-name-label ( RO): test NetBSD
         vdi-uuid ( RO): <not in database>
            empty ( RO): true
           device ( RO): hdd

[root@xenserver1 ~]# xe vbd-destroy uuid=dbb6f49e-9b47-03fc-fd41-460bc03626e8

Boot from a release CD iso image on XenServer 6.2 (free)

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