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Bug 949810

Summary: Duplicate ID set for scsi controller when adding the second scsi disk
Product: Red Hat Enterprise Linux 7 Reporter: tingting zheng <tzheng>
Component: libvirtAssignee: Martin Kletzander <mkletzan>
Status: CLOSED CURRENTRELEASE QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.0CC: acathrow, codong, cwei, dyuan, jdenemar, lcui, mjenner, mkletzan, mzhan, shyu, weizhan
Target Milestone: rcFlags: shyu: needinfo-
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: libvirt-1.0.5-1.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 950330 1218569 (view as bug list) Environment:
Last Closed: 2014-06-13 11:21:12 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 950330    

Description tingting zheng 2013-04-09 05:25:14 UTC 
Description
Duplicate ID set for scsi controller when adding the second scsi disk

Version:
virt-manager-0.9.5-1.el7.noarch
libvirt-1.0.3-1.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Make sure you  have a guest installed using scsi disk.
# virsh dumpxml scsi
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/scsi.img'/>
      <target dev='sda' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <controller type='scsi' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </controller>

2.Add the second disk,choose disk "Device type" as virtio SCSI disk.
2013-04-08 14:36:24,829 (libvirtobject:135): Redefining 'scsi' with XML diff:
--- Original XML
+++ New XML
@@ -61,5 +61,6 @@
     <memballoon model="virtio">
       <address type="pci" domain="0x0000" bus="0x00" slot="0x07" function="0x0"/>
     </memballoon>
+    <controller type="scsi" index="0" model="virtio-scsi"/>
   </devices>
 </domain>

2013-04-08 14:36:24,917 (libvirtobject:135): Redefining 'scsi' with XML diff:
--- Original XML
+++ New XML
@@ -64,5 +64,10 @@
     <memballoon model="virtio">
       <address type="pci" domain="0x0000" bus="0x00" slot="0x07" function="0x0"/>
     </memballoon>
+    <disk type="file" device="disk">
+      <driver name="qemu" type="raw"/>
+      <source file="/var/lib/libvirt/images/scsi-5.img"/>
+      <target dev="sdb" bus="scsi"/>
+    </disk>
   </devices>
 </domain>

3.Start the guest,error shows for Duplicate ID 'scsi0' for device.
2013-04-08 14:36:29,829 (error:80): dialog message: Error starting domain: internal error process exited while connecting to monitor: qemu-kvm: -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x8: Duplicate ID 'scsi0' for device
 : Error starting domain: internal error process exited while connecting to monitor: qemu-kvm: -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x8: Duplicate ID 'scsi0' for device

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 96, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 117, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1160, in startup
    self._backend.create()
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 692, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: internal error process exited while connecting to monitor: qemu-kvm: -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x8: Duplicate ID 'scsi0' for device

4.Check the xml of guest,the index of controller scsi is the same.
# virsh dumpxml scsi
    <controller type='scsi' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </controller>
    <controller type='scsi' index='0' model='virtio-scsi'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </controller>

5.If change the xml,modify index of the second scsi controller as a different value,guest can boot successfully.
    <controller type='scsi' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </controller>
    <controller type='scsi' index='1' model='virtio-scsi'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </controller>

Actual results：
As describes.

Expected results:
Correct ID set for scsi controller when adding the second scsi disk

Additional info:
Comment 2 Martin Kletzander 2013-04-09 10:32:19 UTC 
This looks like a libvirt's problem.  Even though virt-manager could change the model of the scsi controller which is not virtio-serial, this should work also and needs to be addressed in libvirt.  Reassigning.
Comment 3 Jiri Denemark 2013-04-09 21:45:26 UTC 
Well, libvirt should have refuse to add a new scsi controller with the same index (0). But it's virt-manager's fault that it even tried to add a second scsi controller with index='0'.
Comment 4 Martin Kletzander 2013-04-10 06:13:06 UTC 
You're right, I missed the fact that both controllers have the index already specified.  So there are two problems here, both libvirt and virt-manager should prevent this situation.
Comment 5 Martin Kletzander 2013-05-30 07:46:49 UTC 
Moving to MODIFIED as this was fixed with commit v1.0.4-273-g2bbbf0b:

commit 2bbbf0beb82dabac379770b61b619fbdddaae8c6
Author: Ján Tomko <jtomko>
Date:   Tue Apr 23 14:24:32 2013 +0200

    conf: reject controllers with duplicate indexes
Comment 6 Shanzhi Yu 2013-11-27 09:13:44 UTC 
still reproduce it with latest libvirt & virt-manager

Version:
libvirt-1.1.1-13.el7.x86_64
virt-manager-0.10.0-7.el7.noarch

Steps:

1. define an guest 
# virsh dumpxml rhel6
..
 <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/var/lib/libvirt/images/kvm-rhel6.5-x86_64-qcow2.img'/>
      <target dev='sda' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
..

2. use virt-manager to add the second disk,choose disk "Device type" as Virtio SCSI Disk.

3. check guest xml
# virsh dumpxml rhel6
..
 <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/var/lib/libvirt/images/kvm-rhel6.5-x86_64-qcow2.img'/>
      <target dev='sda' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/var/lib/libvirt/images/test.img'/>
      <target dev='sdb' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
..
The second disk added by virt-manager has the same ID set as first disk

Also test virsh command, it work well. 
1. # virsh dumpxml rhel6
..
 <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/var/lib/libvirt/images/kvm-rhel6.5-x86_64-qcow2.img'/>
      <target dev='sda' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
..
2. # attach-disk rhel6 /var/lib/libvirt/images/test.img sdb --driver qemu --subdriver qcow2 --cache none  --config
3. # virsh dumpxml rhel6
..
 <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/var/lib/libvirt/images/kvm-rhel6.5-x86_64-qcow2.img'/>
      <target dev='sda' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none'/>
      <source file='/var/lib/libvirt/images/test.img'/>
      <target dev='sdb' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>
..
Comment 7 Shanzhi Yu 2013-11-27 10:00:31 UTC 
can't reproduce the problem in comments 6 and move this bug to REVERIED.
Comment 8 Ludek Smid 2014-06-13 11:21:12 UTC 
This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.