[CentOS-virt] Missing module grub entry in xen-4.4.3-9 & boot issues

[Phill Bandelow]

HI,

We've started to see several issues with the Xen releases. Going back to
basics I've used this guide
https://wiki.centos.org/HowTos/Xen/Xen4QuickStart

Once the install process is complete the grub.conf looks like this:

default=0
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
title CentOS (3.18.21-17.el6.x86_64)
        root (hd0,0)
        kernel /boot/xen.gz dom0_mem=1024M,max:1024M cpuinfo
com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all
        module /boot/vmlinuz-3.18.21-17.el6.x86_64 ro root=/dev/vda1
rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16
crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
title CentOS (2.6.32-573.12.1.el6.x86_64)
        root (hd0,0)
        kernel /boot/vmlinuz-2.6.32-573.12.1.el6.x86_64 ro root=/dev/vda1
rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16
crashkernel=auto  KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
        initrd /boot/initramfs-2.6.32-573.12.1.el6.x86_64.img
title CentOS (2.6.32-358.el6.x86_64)
        root (hd0,0)
        kernel /boot/vmlinuz-2.6.32-358.el6.x86_64 ro
root=UUID=71b203ab-36ea-4aa8-9ba3-78e4109f0ca4 rd_NO_LUKS rd_NO_LVM
LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto
KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
        initrd /boot/initramfs-2.6.32-358.el6.x86_64.img

As you can see the missing module line. If i manually run grub-bootxen.sh
nothing changes.

Manually adding the missing module entry:

module /boot/initramfs-3.18.21-17.el6.x86_64.img

Causes the following:

https://www.dropbox.com/s/ley5nj29ubwqogc/Screenshot%202015-12-20%2011.10.11.png?dl=0

Disabling APIC gives the following console output:

https://www.dropbox.com/s/a6zgioxl9xpg20y/Screenshot%202015-12-20%2011.15.29.png?dl=0

Now i know this is inside a KVM virtual machine, however we are starting to
see this issue on at least 7 standard dedicated servers.

[root at test ~]# rpm -qa | grep xen
xen-libs-4.4.3-9.el6.x86_64
xen-hypervisor-4.4.3-9.el6.x86_64
xen-4.4.3-9.el6.x86_64
centos-release-xen-7-11.el6.x86_64
xen-licenses-4.4.3-9.el6.x86_64
xen-runtime-4.4.3-9.el6.x86_64

[root at test ~]# cat /etc/redhat-release
CentOS release 6.7 (Final)
[root at test ~]#

[root at test ~]# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 23
model name      : Intel(R) Core(TM)2 Quad CPU    Q9400  @ 2.66GHz
stepping        : 10
microcode       : 1
cpu MHz         : 2666.352
cache size      : 4096 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx lm constant_tsc
arch_perfmon unfair_spinlock pni ssse3 cx16 sse4_1 x2apic xsave hypervisor
lahf_lm
bogomips        : 5332.70

-- 
Regards,
Phill
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