libvirt users - Apr 2014 - Fwd: [s3-bug-review] [RHEL7] [Virtual disks] Met error messages while the guest OS booting up on a nbd device.

Hi, all

We met an issue while doing the nbd related test, will you please help to review
if this issue is a bug? Thank you!


================================================
Subject: [s3-bug-review] [RHEL7] [Virtual disks] Met error messages while the
guest OS booting up on a nbd device.

Description:
Start a guest with only one nbd device and with a linux OS installed on the nbd
device,
"virsh create" return successfully, but meet error messages while the
guest OS booting up.


Version:
libvirt-client-1.1.1-29.el7.x86_64
qemu-kvm-1.5.3-60.el7.x86_64
kernel-3.10.0-121.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. start nbd server on the server host.
#nbd-server 10809 /var/lib/libvirt/images/r7g-qcow2.img
 
2. create a domain with xml as bellow.
# virsh create r7g-nbd.xml 
Domain r7g-qcow2 created from r7g-nbd.xml

# virsh dumpxml r7g-qcow2| grep disk -A 7
    <disk type='network' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source protocol='nbd'>
        <host name='10.66.106.34' port='10809'/>
      </source>
      <target dev='sda' bus='scsi'/>
      <alias name='scsi0-0-0-0'/>
      <address type='drive' controller='0' bus='0'
target='0' unit='0'/>
    </disk>

# ps -ef| grep qemu-kvm| grep nbd
qemu     15724     1 99 09:58 ?        00:00:47 /usr/libexec/qemu-kvm -name
r7g-qcow2
......
-drive file=nbd:10.66.106.34:10809,if=none,id=drive-scsi0-0-0-0,format=qcow2 
-device
scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=1
......

3. login to the guest, the console output error messages and fail to booting up.


Actual results：
As described.

Expected results:
The guest can boot up successfully.

Additional info:
Attached screen-shot and log files.


Regards,
chhu

On 23.04.2014 04:09, Chenli Hu wrote:
> inputs_connect: inputs channel client create
> block I/O error in device 'drive-scsi0-0-0-0': Invalid argument
(22)
> block I/O error in device 'drive-scsi0-0-0-0': Input/output error
(5)
> block I/O error in device 'drive-scsi0-0-0-0': Input/output error
(5)
> block I/O error in device 'drive-scsi0-0-0-0': Input/output error
(5)
> nbd.c:nbd_receive_reply():L746: read failed
> nbd.c:nbd_receive_reply():L746: read failed
> nbd.c:nbd_receive_reply():L746: read failed
> nbd.c:nbd_receive_reply():L746: read failed

I'd say this is a qemu bug. Although it's not a good practice to send 
images (or any attachments) to a mailing lists.

Michal