Created attachment 769959 [details] kernel.log with backtrace-output during crash Description of problem: kernel crashes with "general protection fault" when using kvm-virtualization having an el6-guest and el5-guest running. Version-Release number of selected component (if applicable): 3.9.9-301.fc19.x86_64 How reproducible: I had a kvm-based VM with EL6 running and was launching another one for installing EL5. Immediatly before the crash anaconda from el5 was detecting qxl-vga-adapter and _tried_ to start x-server for graphical install. Starting x-server in el5-vm failed and anaconda went to curses-fallback. A few seconds afterwards kernel on host crashed. Steps to Reproduce: 1. start an el6-guest with qxl-VGA 2. create new el5-guest with qxl-VGA and start installation from iso 3. kernel segfaults Actual results: system freezes, after short time monitor switches to "text-mode" and shows detailed info about segfault / kernel panic Expected results: system should stay `running and usable` Additional info: abrt says something about `broken kernel (flags: GD)` on gpf #2,4 and 5 Both vm's config is defaults from virt-manager, but 2 CPU, 2048 MB RAM, IDE1 is VirtIO with writeback-cache and qxl-based-VGA. Tried and reproduceable with CentOS 5.9 / 6.4 and/or SL 5.9 / 6.4 guest-combos. Host Hardware is: Clevo P170HM-barebone Intel Core i7-2860QM CPU @ 2.50GHz 32 GB RAM (4 x 8 GB / DDR3 - PC 1333) nvidia GTX560M (Clevo OEM) @ Gallium 0.4 on NVCF Kernel log is attached.
More infos ahead: Description of problem: kernel crashes with "general protection fault" when using kvm-virtualization running / installing an el5-guest Version-Release number of selected component (if applicable): kernel-3.9.9-301.fc19.x86_64 ... kernel-3.9.5-301.fc19.x86_64 with libvirt-1.0.5.2-1.fc19.x86_64 qemu-kvm-1.4.2-4.fc19.x86_64 xorg-x11-drv-nouveau-1.0.7-1.fc19.x86_64 xorg-x11-server-Xorg-1.14.1-4.fc19.x86_64 How reproducible: 100% Steps to Reproduce: 1. Create vm with default settings for el5 with install from iso 2. Start vm 3. Wait for anaconda detect VGA and start X-server 4. Kernel segfaults causing crash / freeze Additional info: There's no need to run any other vm.
Created attachment 771513 [details] kernel.log duriring segfault/crash Here's another log which exposes some cpu-lockup after kernel is segfaulting. Additonal Info: The kernel segfaults when el5-kvm-guest uses qxl-vga, only. Having the guest use cirrus-vga, e.g., everything seems to be fine.
I tried to reproduce this on my lenovo T420 which I use with nvidia disabled, so it uses Intel graphics. Also got a general protection fault. abrt offered his help to report it, see https://bugzilla.redhat.com/show_bug.cgi?id=983047
I tried kernel-3.9.9-302.fc19.x86_64 from http://koji.fedoraproject.org/koji/buildinfo?buildID=431939 as recommended in 983047. No more crashes occured. In a CentOS 5.9 VM, X with qxl does not work, but that must be a different problem. In a CentOS 6.4 VM, X with qxl works for me.
(In reply to Stephan Dühr from comment #4) > I tried kernel-3.9.9-302.fc19.x86_64 from as recommended in 983047. > No more crashes occured. Works on fresh F19-install for me, too. On my previous install it didn't, but I think that was related to something other or I accidently fetched a wrong build. So I'll close this, as it seems to be related, being a duplicate of bz #976789 > In a CentOS 5.9 VM, X with qxl does not work, but that must be a > different problem. In a CentOS 6.4 VM, X with qxl works for me. You need to install xorg-x11-drv-qxl manually and adapt /etc/X11/xorg.conf from "vesa" to "qxl". spice-vdagent from EPEL-repo is needed for autoresizing, shared clipboard and other qxl-benefits, too. *** This bug has been marked as a duplicate of bug 976789 ***