Bug 705982

Summary: Interface cannot be hot-unplugged from guest on Xen HVM
Product: Red Hat Enterprise Linux 5 Reporter: mliu
Component: libvirtAssignee: Libvirt Maintainers <libvirt-maint>
Status: CLOSED WONTFIX QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: high    
Version: 5.7CC: dallan, dyuan, hjiang, mliu, mzhan, rwu, zpeng
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-10-17 00:33:02 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Attachments:
Description Flags
virt-manager log message, for #virt-manager --debug could not take effect in the rhel5.7. none

Description mliu 2011-05-19 05:22:24 UTC 
Description of problem:
Interface cannot be hot-unplugged from guest on Xen HVM

Version-Release number of selected component (if applicable):
virt-manager-0.6.1-14.el5
kernel-xen-2.6.18-261.el5
xen-3.0.3-131.el5
libvirt-0.8.2-20.el5

How reproducible:
Always

Steps to Reproduce:
1.Make sure you have added a NIC.
2.Launch virt-manager: #virt-manager
3.choose a vm and click the Run button in the Virtual Machine Details window.
3.Click the Hardware tab.
4.Select the NIC you just added then click Remove button.
  
Actual results:
the NIC is still in the list, after reboot vm, the NIC is disappeared.

Expected results:
the NIC is deleted successfully

Additional info:
Comment 1 mliu 2011-05-19 05:47:11 UTC 
This problem can be reproduced when I do virtual disk hot-unplug.
Comment 2 RHEL Program Management 2011-06-21 05:28:18 UTC 
This request was evaluated by Red Hat Product Management for inclusion in Red Hat Enterprise Linux 5.7 and Red Hat does not plan to fix this issue the currently developed update.

Contact your manager or support representative in case you need to escalate this bug.
Comment 4 Cole Robinson 2011-07-12 23:33:37 UTC 
Please provide the output of virt-manager --debug when reproducing.
Comment 5 Huming Jiang 2011-07-13 10:39:26 UTC 
Reproduced with the following components and steps:

Components:
virt-manager-0.6.1-14.el5
libvirt-0.8.2-22.el5
xen-3.0.3-132.el5
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.18-274.el5xen #1 SMP Fri Jul 8 17:45:44 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux

Steps:
1. Add a interface device (type is "pcnet") to a shut-down guest.
2. Start the guest.
3. When the guest boots up completely, remove the "pcnet" interface.

Actual results:
the NIC is still in the list, after reboot vm, the NIC is disappeared.

Expected results:
the NIC is deleted successfully

Additional info:
Interface with type "ne2k_pci" and "rtl8139" has similar problems.
But interface with type "hypervisor default" has no this problem.
Comment 6 Huming Jiang 2011-07-13 10:41:27 UTC 
Created attachment 512629 [details]
virt-manager log message, for #virt-manager --debug could not take effect in the rhel5.7.
Comment 8 Cole Robinson 2011-10-14 22:39:48 UTC 
This is either a xen or libvirt bug.

My xenfv and xenpv guest both have network devices like:

    <interface type='bridge'>
      <mac address='00:16:3e:72:cb:f3'/>
      <source bridge='xenbr0'/>
      <script path='vif-bridge'/>
    </interface>

If I remove that device with 'virsh detach-device' on a running pv guest, virsh dumpxml will no longer show the network device after a couple seconds.

For a fullvirt guest though, detach-device succeeds but the network device is never removed from the dumpxml output.

Reassigning to libvirt for further triage