Bug 867737 - spice migration: prevent race with libvirt
spice migration: prevent race with libvirt
Status: CLOSED DUPLICATE of bug 867724
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: libvirt (Show other bugs)
Unspecified Unspecified
medium Severity high
: rc
: ---
Assigned To: Libvirt Maintainers
Virtualization Bugs
Depends On:
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Reported: 2012-10-18 04:19 EDT by zhe peng
Modified: 2012-10-18 04:23 EDT (History)
5 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2012-10-18 04:23:45 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
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Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description zhe peng 2012-10-18 04:19:11 EDT
Description of problem:
this issue same with bug: 836135, but before migration, using virt-viewer or remote-viewer to connect the guest.

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

How reproducible:

Steps to Reproduce:
1.before migrate, using virt-viewer or remote-viewer to connect the guest
2.doing migration
3.when migrate end,check libvirt log file
Actual results:
cat /var/log/libvirt/libvirtd.log
2012-10-18 02:33:02.456+0000: 30339: debug : qemuMonitorIOProcess:354 : QEMU_MONITOR_IO_PROCESS: mon=0x7ff5c40df5c0 buf={"return": {"migrated": false, "enabled": true, "auth": "none", "port": 5903, "host": "", "channels": [{"port": "56172", "family": "ipv4", "channel-type": 1, "connection-id": 1681692777, "host": "", "channel-id": 0, "tls": false}, {"port": "56178", "family": "ipv4", "channel-type": 4, "connection-id": 1681692777, "host": "", "channel-id": 0, "tls": false}, {"port": "56179", "family": "ipv4", "channel-type": 3, "connection-id": 1681692777, "host": "", "channel-id": 0, "tls": false}, {"port": "56177", "family": "ipv4", "channel-type": 2, "connection-id": 1681692777, "host": "", "channel-id": 0, "tls": false}]}, "id": "libvirt-82"}^M

only get false,not see any "migrated: true" in log.

Expected results:
libvirt should have waited for spice migration status changes, and only then close the src qemu.

Additional info:
refer https://bugzilla.redhat.com/show_bug.cgi?id=836133#c28
Yes, there is a problem: when a spice client is not opened, spice server will change the migration status to "true" immediately. But, when a spice client is up, the spice session data is migrated, and it takes longer (the data passes from the src ,via the client, to the destination). Only when this transfer ends, the migration status changes and the corresponding qmp event is emitted. libvirt should have waited for this change, and only then close the src qemu. According to what you have reported, libvirt didn't wait till the migration status had changed, and closed qemu before query-spice returned "Migrated: true".
Comment 1 Michal Privoznik 2012-10-18 04:23:45 EDT

*** This bug has been marked as a duplicate of bug 867724 ***

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