Bugs item #2796640, was opened at 2009-05-26 03:00 Message generated for change (Comment added) made by jessorensen You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2796640&group_id=180599 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None >Status: Closed >Resolution: Out of Date Priority: 5 Private: No Submitted By: Bob Manners (bobmanners) Assigned to: Nobody/Anonymous (nobody) Summary: KVM Regression from 2.6.28-11 to 2.6.30-rc5 Initial Comment: Changing from the Ubuntu 09.04 stock kernel 2.6.28-11 to the current 'alpha' kernel in the Ubuntu development repository for 'Karmic' 2.6.30-rc5, some (but not all) of my KVM guests stop booting. I have the following guest OSs installed as KVM virtual machines: Ubuntu 09.04, FreeBSD 7.1, Minix 3, OpenSolaris 08.11, Windows XP and Windows 7RC Under 2.6.28-11 these all boot and run OK. With kernel 2.6.30-rc5, Ubuntu, FreeBSD and Minix boot and run OK, but OpenSolaris 08.11, Windows XP and Windows 7RC fail to boot. They appear to freeze very early in the boot process, after the boot loader is done and the OS kernel itself starts loading. There are no strange messages in the host system logs that I am aware of. When the guest OS freezes, it pins one of my CPUs at 100% utilization (I have KVM set to only give one CPU to the guest). This looks like a regression under 2.6.30-rc5. It is possible that it is caused by a Ubuntu patch, and I have filed a bug in Launchpad, but I suspect that this is an upstream problem, and so I am reporting it here also. Please let me know what I can do to assist in debugging this. ---------------------------------------------------------------------- >Comment By: Jes Sorensen (jessorensen) Date: 2010-11-29 08:55 Message: Hi Bob, Given that you have a launchpad bug open too, and that it smells like an Ubuntu specific bug, plus we cannot reproduce it, I will close this as out of date. If we hit it again, lets track it over at bugs.launchpad.net/qemu Thanks for getting back on this! Jes ---------------------------------------------------------------------- Comment By: Bob Manners (bobmanners) Date: 2010-11-26 15:21 Message: I only experienced this problem on Intel Core Duo. On another system which has the more common Intel Core 2 Duo CPU I don't see this issue. Unfortunately my old (2006) laptop which was the Core Duo machine finally died last week so I am unable to confirm whether this KVM bug is still present in the 2.6.35 kernel (Ubuntu Maverick). ---------------------------------------------------------------------- Comment By: Jes Sorensen (jessorensen) Date: 2010-11-26 11:36 Message: Hi, Has this issue been resolved for you? Thanks, Jes ---------------------------------------------------------------------- Comment By: Kenni (kelu6) Date: 2009-05-28 10:26 Message: Your CPU still has the NX flag, which apparently also was my issue: http://thread.gmane.org/gmane.comp.emulators.kvm.devel/31206/focus=31774 ---------------------------------------------------------------------- Comment By: Bob Manners (bobmanners) Date: 2009-05-28 02:22 Message: In response to kelu6's question, actually I am running 32 bit host / 32 bit guest. My CPU is Intel Core Duo (not Core2 Duo) which is a 32 bit CPU: bob@gecko2:~$ cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 14 model name : Genuine Intel(R) CPU T2400 @ 1.83GHz stepping : 8 cpu MHz : 1000.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon bts pni monitor vmx est tm2 xtpr pdcm bogomips : 3658.94 clflush size : 64 power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 14 model name : Genuine Intel(R) CPU T2400 @ 1.83GHz stepping : 8 cpu MHz : 1000.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc arch_perfmon bts pni monitor vmx est tm2 xtpr pdcm bogomips : 3658.93 clflush size : 64 power management: ---------------------------------------------------------------------- Comment By: Kenni (kelu6) Date: 2009-05-27 23:00 Message: Do you run with a 32bit host on a 64bit CPU? It sounds like it could be the same issue I had when changing from kernel 2.6.28.x to 2.6.29: http://thread.gmane.org/gmane.comp.emulators.kvm.devel/31206/focus=31206 If it's the same issue, then adding the argument '-cpu qemu32' or '-cpu qemu64,-nx' to the qemu-command, should fix the issue. Also, Avi Kivity created some patches which fixes the issue in KVM-86. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2796640&group_id=180599 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
