<div dir="ltr"><div>HI,<br><br>We've started to see several issues with the Xen releases. Going back to basics I've used this guide <a href="https://wiki.centos.org/HowTos/Xen/Xen4QuickStart">https://wiki.centos.org/HowTos/Xen/Xen4QuickStart</a><br><br>Once the install process is complete the grub.conf looks like this:<br><br>default=0<br>timeout=5<br>splashimage=(hd0,0)/boot/grub/splash.xpm.gz<br>hiddenmenu<br>title CentOS (3.18.21-17.el6.x86_64)<br> root (hd0,0)<br> kernel /boot/xen.gz dom0_mem=1024M,max:1024M cpuinfo com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all<br> 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<br>title CentOS (2.6.32-573.12.1.el6.x86_64)<br> root (hd0,0)<br> 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<br> initrd /boot/initramfs-2.6.32-573.12.1.el6.x86_64.img<br>title CentOS (2.6.32-358.el6.x86_64)<br> root (hd0,0)<br> 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<br> initrd /boot/initramfs-2.6.32-358.el6.x86_64.img<br><br>As you can see the missing module line. If i manually run grub-bootxen.sh nothing changes.<br><br>Manually adding the missing module entry:<br><br>module /boot/initramfs-3.18.21-17.el6.x86_64.img<br><br>Causes the following:<br><br><a href="https://www.dropbox.com/s/ley5nj29ubwqogc/Screenshot%202015-12-20%2011.10.11.png?dl=0">https://www.dropbox.com/s/ley5nj29ubwqogc/Screenshot%202015-12-20%2011.10.11.png?dl=0</a><br><br></div>Disabling APIC gives the following console output:<br><div><br><a href="https://www.dropbox.com/s/a6zgioxl9xpg20y/Screenshot%202015-12-20%2011.15.29.png?dl=0">https://www.dropbox.com/s/a6zgioxl9xpg20y/Screenshot%202015-12-20%2011.15.29.png?dl=0</a><br><br></div><div>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. <br></div><div><br>[root@test ~]# rpm -qa | grep xen<br>xen-libs-4.4.3-9.el6.x86_64<br>xen-hypervisor-4.4.3-9.el6.x86_64<br>xen-4.4.3-9.el6.x86_64<br>centos-release-xen-7-11.el6.x86_64<br>xen-licenses-4.4.3-9.el6.x86_64<br>xen-runtime-4.4.3-9.el6.x86_64<br><br>[root@test ~]# cat /etc/redhat-release<br>CentOS release 6.7 (Final)<br>[root@test ~]#<br><br>[root@test ~]# cat /proc/cpuinfo<br>processor : 0<br>vendor_id : GenuineIntel<br>cpu family : 6<br>model : 23<br>model name : Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz<br>stepping : 10<br>microcode : 1<br>cpu MHz : 2666.352<br>cache size : 4096 KB<br>physical id : 0<br>siblings : 1<br>core id : 0<br>cpu cores : 1<br>apicid : 0<br>initial apicid : 0<br>fpu : yes<br>fpu_exception : yes<br>cpuid level : 13<br>wp : yes<br>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<br>bogomips : 5332.70<br clear="all"><br>-- <br><div class="gmail_signature"><div dir="ltr"><div><div><div><div>Regards,<br>Phill<br></div></div></div></div></div></div>
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