[libvirt] Failures in existing qemu domain save/restore.

[Laine Stump]

After running a bunch more tests, I am now noticing failures in domain 
save/restore *without* my patch (ie sources built straight from git), 
not 100% in either case (with or without patches), and the same saved 
domain sometimes fails to restore and sometimes is successful. (Most of 
the time (but not all), when I try to restore a domain immediately after 
a save, it fails, but if I then force shutdown of that failed restore 
and restore again from the same file, it succeeds.

(Note that this is all to/from a local disk - it's not related to NFS)

Is there a known problem in domain save/restore? Is anyone else seeing 
any failures?

On 02/19/2010 02:30 AM, Laine Stump wrote:
> (This patch requires that you first apply the virFileOperation patches
> that I sent to the list yesterday.)
>
> I'm hoping someone else's keen eye can see what I'm failing to see
> here.
>
> The patch following this message makes domain save "work" on
> root-squash NFS (both the libvirt header and the QEMU state are saved
> to the file), but the files that it saves don't restore properly, even
> when simply saving to a local directory w/o forking - the guest screen
> comes up black, or reboots immediately, or some other such thing. I've
> looked at the data files and the code, and can't see what difference
> is causing this - at least the header written by libvirt seems to be
> the same, and the part written by qemu starts in the same place and
> looks similar.
>
> If anyone's got an idea, please let me know! I'd like to get this
> figured out and a working patch submitted before the day is done.
>
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