[Qemu-devel] [Bug 1338277] Re: Ubuntu 14.04 + QEmu 2.0 + KSM = 1, makes Windows 2008 R2 guests to crash (BSOD)
** Project changed: qemu = qemu (Ubuntu) -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1338277 Title: Ubuntu 14.04 + QEmu 2.0 + KSM = 1, makes Windows 2008 R2 guests to crash (BSOD) Status in “qemu” package in Ubuntu: New Bug description: Guys, I'm trying to run Windows 2008 as a QEmu guest on my Ubuntu 14.04 but, after lots of tests, I figured out that it doesn't work, QEmu makes Windows 2008 to crash, and it is not a Windows fault, I'm pretty sure that it is a QEmu bug. Lab environment (5 servers): 3 physical servers: Dell R610 2 physycal servers: IBM x3650 * Where Windows crash (5 servers tested) ? Ubuntu 14.04 + QEmu 2.0 + VirtIO 0.1-81 = Windows 2008 crash every hour - Installed with apt-get install ubuntu-virt-server. * Where Windows do not crash (5 servers tested) ? Ubuntu 14.04 + Xen 4.4 + gplpv_Vista2008x64_1.0.1092.9 = Windows working smoothly - Installed with apt-get install xen-system-amd64. So, after removing QEmu from my environment, and using Xen instead, all Windows guests are now running without any crash. What kind of information, can I provide for you guys, to deep debug this QEmu problem ? Plus, it is interesting to note that a lot of times, all Windows guests (on top of QEmu / KVM) crashes at the exactly the same time! So, it can not be a problem within each Windows guest, but at the Hypervisor itself! Something happen there, that affects almost all Windows guests simultaneously. Also, it worth to mention that this problem is probably affecting clouds based on OpenStack IceHouse, on top of Ubuntu + QEmu 2.0... Screenshots: http://i.imgur.com/vnJSTgg.png http://i.imgur.com/34nADWr.png NOTE: I'm using KSM (Kernel Samepage Merging) with QEmu, to save RAM. It seems that when with Xen (+QEmu / HVM), KSM is not used :'( , but it is enabled ( 1 /sys/kernel/mm/ksm/run at Dom0's kernel). I did not tried to disable KSM to see if Windows becomes more stable on QEmu 2.0... Also, I did not run tests on this environment with Ubuntu 12.04.4 (or 12.04.4 with Ubuntu Cloud Archives, to get newer versions of QEmu (but not 2.0) for old LTS). CURIOSITY: On older hardware, like Dell R1950, and at my old Intel Desktop Core i7, I'm running Windows 2008 and 7, on Ubuntu 14.04 with QEmu 2.0 without any crash... I really like to figure out why QEmu is crashing Windows guests on Dell R610 and on IBM x3650... Attaching the VM's configuration files on next posts... Best, Thiago To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1338277/+subscriptions
[Qemu-devel] [Bug 977391] Re: BUG: soft lockup - CPU#8 stuck for 61s! [kvm:*] in lucid
Rahul, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest server release of Ubuntu? ISO images are available from http://releases.ubuntu.com/raring/ . If it remains an issue, could you please run the following command in the development release from a Terminal (Applications-Accessories-Terminal), as it will automatically gather and attach updated debug information to this report: apport-collect -p linux replace-with-bug-number Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested. For example: kernel-fixed-upstream-v3.11-rc7 This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag: needs-upstream-testing If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER As well, please remove the tag: needs-upstream-testing Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Tags added: needs-kernel-logs needs-upstream-testing ** Changed in: linux (Ubuntu) Status: Confirmed = Incomplete -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/977391 Title: BUG: soft lockup - CPU#8 stuck for 61s! [kvm:*] in lucid Status in QEMU: Confirmed Status in “linux” package in Ubuntu: Incomplete Status in “qemu-kvm” package in Ubuntu: Confirmed Bug description: Two days back my KVM base machine got hung up all of a sudden. Not sure what exactly happened. cat /proc/version_signature Ubuntu 2.6.32-28.55-server 2.6.32.27+drm33.12 -Rahul N. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/977391/+subscriptions
[Qemu-devel] [Bug 977391] Re: BUG: soft lockup - CPU#8 stuck for 61s! [kvm:*] in lucid
rahul, thank you for reporting this and helping make Ubuntu better. Could you please capture the oops following https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Capturing_OOPs ? ** Tags added: lucid ** Changed in: linux (Ubuntu) Status: Confirmed = Incomplete -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/977391 Title: BUG: soft lockup - CPU#8 stuck for 61s! [kvm:*] in lucid Status in QEMU: Confirmed Status in “linux” package in Ubuntu: Incomplete Status in “qemu-kvm” package in Ubuntu: Confirmed Bug description: Two days back my KVM base machine got hung up all of a sudden. Not sure what exactly happened. cat /proc/version_signature Ubuntu 2.6.32-28.55-server 2.6.32.27+drm33.12 -Rahul N. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/977391/+subscriptions
