On Thu, Oct 13, 2022 at 01:23:40AM +0530, manish.mishra wrote: > Hi Everyone, > Hope everyone is doing great. I have seen some live migration issues with > qemu-4.2 when using multiFD. Signature of issue is something like this. > 2022-10-01T09:57:53.972864Z qemu-kvm: failed to receive packet via multifd > channel 0: multifd: received packet magic 5145564d expected 11223344 > > Basically default live migration channel packet is received on multiFD > channel. I see a older patch explaining potential reason for this behavior. > https://lists.gnu.org/archive/html/qemu-devel/2019-10/msg05920.html > > [PATCH 3/3] migration/multifd: fix potential wrong acception order of IO. > > But i see this patch was not merged. By looking at qemu master code, i > could not find any other patch too which can handle this issue. So as > per my understanding this is still a potential issue even in qemu > master. I mainly wanted to check why this patch was dropped?
See my repllies in that message - it broke compatilibity of data on the wire, meaning old QEMU can't talk to new QEMU and vica-verca. We need a fix for this issue, but it needs to take into account wire compatibility. With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
