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Re: [Xen-devel] [osstest test] 60719: tolerable FAIL - PUSHED



On 09/10/2015 10:40 AM, Ian Campbell wrote:
On Thu, 2015-09-03 at 10:35 -0600, Jim Fehlig wrote:

I wonder if this has anything to do with migration V2? I noticed a migration
regression a few days back, but later realized that the sender was 4.5 and
receiver was 4.6. I planned to see if migration worked through libvirt between
two 4.6 hosts, but before doing so I had to re-purpose the machines for another
task. I think libvirt needs some work to accommodate migration V2...
So after shaving a bunch of yakks wrt getting my test boxes setup I've
finally tracked this one down...

Thanks for investigating this issue! It bubbled to the top of my queue, so I'm glad I read this mail before duplicating the effort.


libvirt is passing libxl a restore (and perhaps save) file descriptor which
is set O_NONBLOCK, which libxl/c doesn't expect and therefore doesn't
handle the resulting EAGAIN.

Ian and I think it would be more convenient for most callers if libxl took
care of this by making the fd blocking again and returning it to the
original state when it was done.

I'll cook up a patch.

I also noticed your patch has been ACK'ed and applied.  Thanks again!

Regards,
Jim


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