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Bug 1068694

Summary: migration failed after hot unplug virtio device
Product: Red Hat Enterprise Linux 6 Reporter: Luiz Capitulino <lcapitulino>
Component: qemu-kvmAssignee: Luiz Capitulino <lcapitulino>
Status: CLOSED NOTABUG QA Contact: Virtualization Bugs <virt-bugs>
Severity: medium Docs Contact:
Priority: medium    
Version: 6.6CC: acathrow, bsarathy, flang, hhuang, juzhang, mazhang, mkenneth, qzhang, virt-maint
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 1040840 Environment:
Last Closed: 2014-03-03 14:51:39 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:

Description Luiz Capitulino 2014-02-21 17:04:12 UTC 
+++ This bug was initially created as a clone of Bug #1040840 +++

Description of problem:
migration failed after hot unplug virtio balloon

Version-Release number of selected component (if applicable):

Host:
qemu-kvm-rhev-1.5.3-21.el7.x86_64
kernel-3.10.0-57.el7.x86_64

Gust:
rhel7-64/win8.1-32

How reproducible:
always

Steps to Reproduce:
1.boot vm on src host with memory balloon device:
/usr/libexec/qemu-kvm \
-M pc \
-cpu SandyBridge \
-m 2G \
-smp 4,sockets=2,cores=2,threads=1,maxcpus=16 \
-enable-kvm \
-name win8-32 \
-uuid 990ea161-6b67-47b2-b803-19fb01d30d12 \
-smbios type=1,manufacturer='Red Hat',product='RHEV Hypervisor',version=el6,serial=koTUXQrb,uuid=feebc8fd-f8b0-4e75-abc3-e63fcdb67170 \
-k en-us \
-rtc base=localtime,clock=host,driftfix=slew \
-nodefaults \
-monitor stdio \
-qmp tcp:0:6666,server,nowait \
-boot menu=on \
-bios /usr/share/seabios/bios.bin \
-drive file=/home/rhel7-64.qcow2,if=none,id=drive-data-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop \
-device virtio-blk-pci,bus=pci.0,addr=0x7,scsi=off,drive=drive-data-disk,id=data-disk \
-vga std \
-vnc :0 \
-device virtio-balloon-pci,bus=pci.0,id=balloon0 \
-netdev tap,id=hostnet0,script=/etc/ovs-ifup,downscript=/etc/ovs-ifdown \
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:01:01:ef \

2.Hot unplug balloon device
(qemu) device_del balloon0
(qemu) info balloon 
Device 'balloon' has not been activated

3.Start qemu-kvm process on des host *without* memory balloon device for migration.
...
-drive file=/mnt/rhel7-64.qcow2,if=none,id=drive-data-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop \
-device virtio-blk-pci,bus=pci.0,addr=0x7,scsi=off,drive=drive-data-disk,id=data-disk \
-vga std \
-vnc :0 \
-incoming tcp:0:5800 \
-netdev tap,id=hostnet0,script=/etc/ovs-ifup,downscript=/etc/ovs-ifdown \
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:01:01:ef \

4.Start migration on src host:
(qemu) migrate -d tcp:10.66.106.40:5800

Actual results:
Migration failed, qemu-kvm on destination host quit:

QEMU 1.5.3 monitor - type 'help' for more information
(qemu) info status
VM status: paused (inmigrate)
(qemu) Unknown ramblock "0000:00:04.0/virtio-net-pci.rom", cannot accept migration
qemu: warning: error while loading state for instance 0x0 of device 'ram'

Expected results:
Migration success
Comment 1 Luiz Capitulino 2014-02-21 17:06:41 UTC 
Got this with qemu-kvm-0.12.1.2-2.415.el6.x86_64 on RHEL6:

[root@volcano-r6 disks]# /usr/libexec/qemu-kvm -drive file=./rhel7.img,if=virtio,cache=none,aio=native -enable-kvm -m 1G -monitor stdio -spice port=5931,disable-ticketing -snapshot -incoming tcp:0:4444
QEMU 0.12.1 monitor - type 'help' for more information
(qemu) Unknown savevm section or instance '0000:00:05.0/virtio-blk' 0
load of migration failed
[root@volcano-r6 disks]#
Comment 2 Luiz Capitulino 2014-03-03 14:51:39 UTC 
RHEL7 buddy bug 1040840 closed as NOTABUG, see bug 1040840 comment 11 for an explanation, it applies for RHEL6 too.