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DescriptionDaniel Veillard
2011-01-28 08:09:12 UTC
Description of problem:
When doing concurrent P2P migration with the QEmu/KVM driver,
the absence of locking can deadlock the daemon, problem and
patch reported by Fujitsu:
https://www.redhat.com/archives/libvir-list/2011-January/msg00884.html
Version-Release number of selected component (if applicable):
libvirt-0.8.7-3.el6 and previous
How reproducible:
Steps to Reproduce:
1. run concurrent P2P migrations of KVM domains
2.
3.
Actual results:
Expected results:
Additional info:
Patch commited upstream as bda57661b8086b4d5858328afdfc28fe1b58f112
We may want to also checrry pick a couple of other patches from them
related to fixing P2P migration handling desturi errors and documentation:
https://www.redhat.com/archives/libvir-list/2011-January/msg00439.html
Patch 59d13aae329ce7d4153e5f8a7d7ec94b779a610b
https://www.redhat.com/archives/libvir-list/2011-January/msg00438.html
Patch 2fd1a2525b78adb3c2d73cd55c278462f74f4953
verify pass on
libvirt-0.8.7-6.el6.x86_64
qemu-kvm-0.12.1.2-2.144.el6.x86_64
kernel-2.6.32-113.el6.x86_64
reproduce the bug with
libvirt-0.8.7-3.el6.x86_64
qemu-kvm-0.12.1.2-2.144.el6.x86_64
kernel-2.6.32-113.el6.x86_64
Steps:
1. Prepare 2 hosts and setting
#setsebool -P virt_use_nfs 1
on both sides
2. #iptables -F
3. mount nfs on both sides and prepare 20 guest with name mig{0..19}
4. For walking around another bug need to add hostname and ip of each other on /etc/hosts of the two hosts
5. on source host
a. on one console do
#while(true); do for i in {0..19}; do virsh domblkinfo mig$i /mnt/mig$i; done;done
b. on another console do
#sh migrate.sh
on migrate.sh is
#!/bin/sh
for i in {0..19}
do
virsh migrate --p2p --live mig$i qemu+ssh://{dest ip}/system &
done
Sometimes it may report error on libvirt-0.8.7-3.el6.x86_64
# virsh list
error: unable to connect to '/var/run/libvirt/libvirt-sock', libvirtd may need to be started: Connection refused
error: failed to connect to the hypervisor
# service libvirtd status
libvirtd dead but pid file exists
for libvirt-0.8.7-6.el6.x86_64 migration always succeeds and libvirtd is still running after migration. So verify pass.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.
http://rhn.redhat.com/errata/RHBA-2011-0596.html