Bug 1495474
| Summary: | Fail to quit source qemu when do live migration after mirroring guest to NBD server [rhel-7.4.z] | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Oneata Mircea Teodor <toneata> |
| Component: | qemu-kvm-rhev | Assignee: | Eric Blake <eblake> |
| Status: | CLOSED ERRATA | QA Contact: | Longxiang Lyu <lolyu> |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | 7.4 | CC: | aliang, chayang, coli, dgilbert, eblake, famz, jsuchane, juzhang, knoel, lbopf, lolyu, michen, mtessun, ppandit, qzhang, shuang, stefanha, virt-maint |
| Target Milestone: | rc | Keywords: | Regression, ZStream |
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-rhev-2.9.0-16.el7_4.9 | Doc Type: | Bug Fix |
| Doc Text: |
Improvements made for qemu 2.9 to the NBD code used during live storage migration were not robust to an abrupt exit of the other end of the connection; the result was that live migration could fail if the source side NBD connection failed. The NBD code has been fixed to be more robust regardless of what the other side of the connection does.
|
Story Points: | --- |
| Clone Of: | 1482478 | Environment: | |
| Last Closed: | 2017-11-30 20:34:33 UTC | Type: | --- |
| 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: | 1482478 | ||
| Bug Blocks: | |||
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Description
Oneata Mircea Teodor
2017-09-26 07:00:19 UTC
Moving to POST. https://post-office.corp.redhat.com/archives/rhvirt-patches/2017-September/msg00758.html Fix included in qemu-kvm-rhev-2.9.0-16.el7_4.9 Bug is verified pass for qemu-kvm-rhev-2.9.0-16.el7_4.9
Steps for verification:
1. boot guest on src
#!/bin/bash
/usr/libexec/qemu-kvm \
-name guest=test-virt \
-machine pc,usb=off,vmport=off,dump-guest-core=off \
-cpu SandyBridge \
-m 2G \
-smp 4,sockets=4,cores=1,threads=1 \
-boot strict=on \
-drive file=/home/test/nbd01/test.qcow2,if=none,cache=none,snapshot=off,format=qcow2,id=img0 \
-device virtio-blk-pci,bus=pci.0,addr=0x7,drive=img0,id=virtio-disk0,bootindex=1 \
-netdev tap,id=hostnet0,vhost=on \
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:12:b3:20:61,bus=pci.0,addr=0x3 \
-device VGA \
-usbdevice tablet \
-vnc :1 \
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8 \
-monitor stdio \
-qmp tcp:0:4444,server,nowait
2. create dest mirror image
# qemu-img create -f qcow2 mirror1.qcow2 20G
3. start dest guest and setup as NBD server
#!/bin/bash
/usr/libexec/qemu-kvm \
-name guest=test-virt \
-machine pc,accel=kvm,usb=off,vmport=off,dump-guest-core=off \
-cpu SandyBridge \
-m 2G \
-smp 4,sockets=4,cores=1,threads=1 \
-boot strict=on \
-drive file=/home/test/nbd01/mirror1.qcow2,if=none,cache=none,snapshot=off,format=qcow2,id=img0 \
-device virtio-blk-pci,bus=pci.0,addr=0x7,drive=img0,id=virtio-disk0,bootindex=1 \
-netdev tap,id=hostnet0,vhost=on \
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:12:b3:20:61,bus=pci.0,addr=0x3 \
-device VGA \
-usbdevice tablet \
-vnc :3 \
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8 \
-monitor stdio \
-qmp tcp:0:5555,server,nowait \
-incoming tcp:0:6666
{ "execute": "qmp_capabilities" }
{ "execute": "nbd-server-start", "arguments": { "addr": { "type": "inet", "data": { "host": "127.0.0.1", "port": "9999" } } } }
{ "execute": "nbd-server-add", "arguments": { "device": "img0", "writable": true } }
4. invoke drive-mirror on src to dest
{ "execute": "qmp_capabilities" }
{ "execute": "drive-mirror", "arguments": { "device": "img0", "target": "nbd://127.0.0.1:9999/img0", "sync": "full", "format": "raw", "mode": "existing" } }
5. reopen src to mirror when block mirror is ready
{"execute": "block-job-complete", "arguments": { "device": "img0"} }
6. invoke migration on src
(qemu) migrate -d tcp:0:6666
7. invoke nbd-server-stop when migration completes, and cont to start guest on dest
{ "execute" : "nbd-server-stop", "arguments" : {} }
(qemu) cont
After, the guest could run on dest. Both src and dest qemu could quit normally.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2017:3369 |