** Description changed: Binary package hint: qemu-kvm + ========================================= + SRU Justification + 1. impact: KVM smp guests hang on AMD + 2. how was the bug addressed: Two upstream commits (plus a third auxiliary) were re-implemented on lucid's kernel. + 3. patch: see comment #27 + 4. TEST CASE: in lucid, on an AMD box, start a guest with '-smp 2'. + 5. regression: Honestly this one scares me a bit because it was a tricky cherrypick, and affects timekeeping for all kvm users on x86 lucid. In theory timekeeping on guests could be adversely affected, or guests could fail to boot. However, guests have been tested on both AMD and intel hosts. + ========================================= SMP Linux guests are hanging under KVM. This does not happen always, but at least 50% of the time or so. If I start the guests with "-smp 1" or just completely omit the "-smp" parameter this doesn't happen. I can also say that it doesn't seem to happen on a Nehalem-based 8-core Xeon-based machine I've tried it on, but it does happen on both an AMD Phenom II 965 machine (the one this bug report is from) as well as an AMD Phenom II 1090T-based machine. I am starting the VMs from the command line, manually running qemu-kvm with a command like the following: qemu-system-x86_64 -m 1024 -smp 4 -cpu host -drive file=/var/local/kvm/machine.qcow2,if=virtio,cache=off,boot=on -net nic,model=virtio,macaddr=77:88:99:12:34:56 -net tap -nographic -daemonize Additional Information: Description: Ubuntu 10.04.2 LTS Release: 10.04 qemu-kvm: Installed: 0.12.3+noroms-0ubuntu9.3 Candidate: 0.12.3+noroms-0ubuntu9.3 Version table: *** 0.12.3+noroms-0ubuntu9.3 0 500 http://us.archive.ubuntu.com/ubuntu/ lucid-updates/main Packages 100 /var/lib/dpkg/status 0.12.3+noroms-0ubuntu9 0 500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: qemu-kvm 0.12.3+noroms-0ubuntu9.3 ProcVersionSignature: Ubuntu 2.6.32-28.55-server 2.6.32.27+drm33.12 Uname: Linux 2.6.32-28-server x86_64 Architecture: amd64 Date: Sun Feb 6 19:11:57 2011 InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1) KvmCmdLine: Error: command ['ps', '-C', 'kvm', '-F'] failed with exit code 1: UID PID PPID C SZ RSS PSR STIME TTY TIME CMD MachineType: System manufacturer System Product Name ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-28-server root=UUID=941072c0-f822-44b4-b61c-09b6daadcb7c ro quiet splash clocksource=pit ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: qemu-kvm dmi.bios.date: 08/18/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1006 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: M4A785-M dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev X.0x dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1006:bd08/18/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A785-M:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/714335 Title: KVM SMP Linux Guests Hang on AMD -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
