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Description of problem:
When p2p migration fails early because qemuMigrationIsAllowed or
qemuMigrationIsSafe say migration should be cancelled, we fail to clear
the migration-out async job. As a result of that, further APIs called
for the same domain may fail with Timed out during operation: cannot
acquire state change lock.
Version-Release number of selected component (if applicable):
libvirt-0.10.2-4.el6, introduced upstream in 0.9.5
How reproducible:
100%
Steps to Reproduce:
1. create and start a domain with disk on NFS and cache != none
2. virsh migrate --p2p $URI $DOM
3. virsh migrate --p2p $URI $DOM
Actual results:
Step 2 correctly results in:
error: Unsafe migration: Migration may lead to data corruption if disks use cache != none
Steps 3 will timeout after 30 seconds and report:
error: Timed out during operation: cannot acquire state change lock
Expected results:
No matter how many time we try to migrate the domain, it should still report error: Unsafe migration: Migration may lead to data corruption if disks use cache != none
Additional info:
I can reproduce this with: libvirt-0.10.2-4.el6.x86_64
virsh # migrate aaa --p2p qemu+ssh://10.66.7.161/system --unsafe
error: Timed out during operation: cannot acquire state change lock
Fixed upstream by v0.10.2-191-g837993d":
commit 837993d845a32bb222959a84d1c03a0c47f785be
Author: Jiri Denemark <jdenemar>
Date: Wed Oct 17 14:08:17 2012 +0200
qemu: Clear async job when p2p migration fails early
When p2p migration fails early because qemuMigrationIsAllowed or
qemuMigrationIsSafe say migration should be cancelled, we fail to clear
the migration-out async job. As a result of that, further APIs called
for the same domain may fail with Timed out during operation: cannot
acquire state change lock.
Reported by Guido Winkelmann.
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.
http://rhn.redhat.com/errata/RHSA-2013-0276.html