We are observing an issue booting Linux 4.10.1 kernel HVM SMP guests on our
XenServer cluster (effects all 3 Skylake nodes) across multiple guest distros
(Ubuntu and CoreOS) with the guests hanging on boot.
The guests will hang with the last boot message being:
"[ 0.132038] x86: Booting SMP configuration"
Bisecting the revision from 4.9 to 4.10.1 I tracked it down to
- first bad commit: [3be134e5152f08e8bd3c2afdaac723f64d93c2bb] Merge tag
Changing the Guests to 1 CPU permits it to continue booting (it later hangs
[ 1.633261] xvda: xvda1 xvda2 xvda3 xvda4 xvda6 xvda7 xvda9
Which I will bisect and discuss separately.). I have more detail on
https://github.com/coreos/bugs/issues/1849 , since it effect ubuntu as well I
believe its better handled here.