[CentOS-virt] Frequent Kernel Oops' on CentOS 6 / Xen

Tue Jul 29 19:44:39 UTC 2014
Daniel Bradler <daniel at bradler.com>

Hi,

we have a couple of nodes based on CentOS 6 and Xen4CentOS. Unfortunately
some of these nodes keep crashing frequenly.

We use the latest versions:

# uname -r
3.10.43-11.el6.centos.alt.x86_64

# xm info
host                   : vserver20
release                : 3.10.43-11.el6.centos.alt.x86_64
version                : #1 SMP Mon Jun 16 14:22:02 UTC 2014
machine                : x86_64
nr_cpus                : 24
nr_nodes               : 2
cores_per_socket       : 6
threads_per_core       : 2
cpu_mhz                : 2400
hw_caps                : bfebfbff:2c100800:00000000:00003f40:009ee3fd:00000000:00000001:00000000
virt_caps              : hvm hvm_directio
total_memory           : 65527
free_memory            : 22692
free_cpus              : 0
xen_major              : 4
xen_minor              : 2
xen_extra              : .4-33.el6
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
xen_commandline        : dom0_mem=2560M,max:3072M loglvl=all
guest_loglvl=all
cc_compiler            : gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-4)
cc_compile_by          : mockbuild
cc_compile_domain      : centos.org
cc_compile_date        : Mon Jun 16 17:22:14 UTC 2014
xend_config_format     : 4

Our configuration looks as follows:

Grub:

title CentOS (3.10.43-11.el6.centos.alt.x86_64)
         root (hd0,1)
         kernel /xen.gz dom0_mem=2560M,max:3072M loglvl=all guest_loglvl=all
         module /vmlinuz-3.10.43-11.el6.centos.alt.x86_64 ro root=/dev/sda1 KEYBOARDTYPE=pc KEYTABLE=de-latin1-nodeadkeys crashkernel=auto
         module /initramfs-3.10.43-11.el6.centos.alt.x86_64.img

/etc/xen/xend-config.sxp

(xend-unix-server yes)
(xend-relocation-server no)
(xend-relocation-hosts-allow '^localhost$ ^localhost\\.localdomain$')
(network-script network-bridge)
(vif-script vif-bridge)
(dom0-min-mem 1024)
(enable-dom0-ballooning no)
(total_available_memory 0)
(dom0-cpus 0)
(vncpasswd '')

I've attached the logfile information regarding the latest crash as
crash.log?

Does anybody has an idea how to solve these issues?

Kind Regards
Daniel Bradler
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