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1608 discussions

Xen kernel-3.18.25-18 for EL6 and EL7 (CVE-2016-0728)
by Johnny Hughes 20 Jan '16

20 Jan '16

There is now a kernel-3.18.25-18 that fixes CVE-2016-0728 (and upgrades to the lastest 3.18 LTS kernel) for Xen4CentOS users. This kernel can be tested from here: http://cbs.centos.org/repos/virt6-xen-common-testing/x86_64/os/Packages/ (CentOS-6) and here: http://cbs.centos.org/repos/virt7-xen-common-testing/x86_64/os/Packages/ (CentOS-7) Once we get several tested installs we can move this to released. For more info on CVE-2016-0728: http://bit.ly/1nifPm4 There is info in the above link on testing the vulnerability is fixed .. see the code under 'Triggering the bug from userspace is fairly straightforward, as we can see in the following code snippet'. Reports that the kernel works, and that the CVE-2016-0728 issue is tested (before and after installing the new kernel) would be greatly appreciated on this thread. The following changelogs are also applicable in a upgrade from the current 3.18.21-17 release and this 3.18.25-18 release: https://cdn.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.25 https://cdn.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.24 https://cdn.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.23 https://cdn.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.22 Thanks. Johnny Hughes

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How to debug kernel with kernel-3.10.68-11.el6
by Xiaoding (B) 19 Jan '16

19 Jan '16

Hi all I used kernel-3.10.68-11.el6 as dom0 and config kdump I have got vmcore file when compute crash, but not found debuginfo package from http://debuginfo.centos.org/ I found kernel-3.10.68-11.el6 set CONFIG_DEBUG_INFO=n Why not set this key? Is there any other method to debug when compute crash Best Wishes Ding

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Networking Problem
by Günther J. Niederwimmer 14 Jan '16

14 Jan '16

Hello, I have two problems one big and the other small with my KVM System I have four NICs configured on my system, and I lost the most time on reboot one NIC ? I have all clients configured in the same way and I lost on all clients the same NIC ? The NICs are configured in virt-manager 2 x Hostdev ens10 ens9 1 x Bridge (virtio) eth1 // this is the Problem NIC 1x Isolated Network (virtio) eth0 I have configure two even Computers and have on all the same problem? have any a idea what is wrong with the Network? On a other System with three NICs near the same configuration all is working? The second Problem is, I can't disable the IPv6_PRIVACY on "ens9" I have all disabled in the Kernel I set it in the ifconf-ens9, but I have the most time a privacy IPv6 Address ? after a "systemctl restart network" the IPv6_PRIVACY is gone ? What is different on a boot initial and a systemctl restart network ? -- mit freundlichen Grüßen / best regards, Günther J. Niederwimmer

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CentOS 6 Xen: XSAs 167-169, update to Xen 4.6
by George Dunlap 14 Jan '16

14 Jan '16

XSA 169 is out, but is low-priority and has a work-around, so I'm going to batch it together with XSAs 167-168 and release a new 4.4.3 package when the embargo is lifted next Wednesday. This will be the last XSA update for the 4.4.3 packages. Today or tomorrow I will push the Xen 4.6.0 packages to buildlogs for testing; and sometime after the final 4.4.3 packages are released, I will push the Xen 4.6 packages as the main Xen packages. The Virt SIG is a community project, so anyone wishing to maintain the Xen 4.4. packages going forward is welcome to step up to do so. -George

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Welcoming a new SIG member :)
by Lokesh Mandvekar 13 Jan '16

13 Jan '16

Virt SIG folks, please join me in welcoming our latest SIG member, Marianne Lombard (username: jehane). She's been a Fedora contributor for quite sometime already, and will now be helping to ensure I'm not being a bottleneck RE: docker on CentOS virt :) Welcome aboard, Marianne. -- Lokesh Freenode: lsm5 GPG: 0xC7C3A0DD

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Resigning as lead of the Virt SIG
by Lars Kurth 09 Jan '16

09 Jan '16

Hi all, I wanted to let you know that I feel I need to step down as leader of the Virtualisation SIG. When I originally was approached by KB to do this, it was always clear that this would be a temporary thing until the SIG got going. At the time, only Xen and CentOS folks were involved with the SIG. Since then, we added oVirt and Docker maintainers, have a total of 5 maintainers and built good momentum. There are two reasons why I feel I should step down as leader of the Virt SIG: a) I have been traveling too much and thus did not have the bandwidth to do this job justice in recent months. b) In addition, it would also make more sense for one of the Virt SIG maintainers who is more closely involved with day-to-day activities to pick up this job. I will still be able to help with PR and other items. When I was absent over the last few months, George Dunlap (gwd on irc) did most of the groundwork and led SIG meetings on my behalf, so I wanted to propose that George leads the SIG going forward. That is assuming that none of the other SIG maintainers want to step up. George agreed in principle. In the last Virt SIG meeting, not all maintainers were present, so we couldn't make a formal decision. KB said the following: kbsingh: I think if gwd is ok with it, and people are ok in the SIG, its good for me This means that succession either has to be settled in the next SIG meeting, or by e-mail responding to this thread. I don't think there is any formal process, but I would suggest that the maintainers listed on https://wiki.centos.org/SpecialInterestGroup/Virtualization should have a say either at the next IRC meeting or by replying to this email thread. Best Regards Lars

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Disable ps2 mouse and keyboard in a kvm guest
by C.L. Martinez 08 Jan '16

08 Jan '16

Hi all, I have to do some tests with a kvm guest but I need to disable ps2 mouse and ps2 keyboard and use only usb keyboard/mouse. When I try to remove them, virt-manager adds them automatically. How can I disable all ps2 devices? Any idea? Thanks.

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How to debug kernel with kernel-3.10.68-11.el6
by Xiaoding (B) 25 Dec '15

25 Dec '15

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CentOS 7.2 libvirtd 1.2.17 bug
by Pulkit Gupta 22 Dec '15

22 Dec '15

Hi, There is a strange issue in the CentOS 7.2 libvirtd 1.2.17 service. If there is a symlink in the "/etc/libvirt/qemu/autostart/" which is created before the libvirtd service is started, libvirtd wont start. Deleting the symlink from the autostart folder, then starting the libvirtd service works. Is this a know issue ? We have found this on 4-5 servers. Regards, Pulkit Gupta

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Missing module grub entry in xen-4.4.3-9 & boot issues
by Phill Bandelow 21 Dec '15

21 Dec '15

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%2011.10.1… Disabling APIC gives the following console output: https://www.dropbox.com/s/a6zgioxl9xpg20y/Screenshot%202015-12-20%2011.15.2… 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@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@test ~]# cat /etc/redhat-release CentOS release 6.7 (Final) [root@test ~]# [root@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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