On Fri, Aug 24, 2012 at 09:57:35AM -0600, Dale Swanston wrote: > Hello. > > We are running a guest OS of CentOS 4.4 (kernel 2.6.12) for legacy > reasons, upgrading is not an option. NTP is running on the host > and synching with a local GPS NTP server. But due to frequency > drift in the guest it restarts itself periodically and upon start up > performs an ntpdate to force a time jump on the guest. > > I have seen 2 occasions now (over 2 months) where the VM hangs right > as the ntpdate command alters the guest clock (based on output in > /var/log/messages). > > From the host's perspective the VM is still running but it appears > to be using very high CPU percentage (more than typical). The only > recovery option is to force shutdown of the VM and restart it. This should not happen. > 1. Are there any known issues with ntpdate and VMs hanging? Any > workarounds? > 2. Are there any debugging tools further characterise the problem? Upgrading the guest kernel is not an option? At least install recent kernel in guest to confirm that its not an already fixed bug. > Thanks in advance, > Dale > > > Further specifics, let me know if more details are needed: > > Host: > # uname -a > Linux s1pscu01host 2.6.32-220.el6.x86_64 #1 SMP Sat Dec 10 17:04:11 > CST 2011 x86_64 x86_64 x86_64 GNU/Linux > > on Intel(R) Xeon(R) CPU E5620 @ 2.40GHz > > with qemu-kvm-0.12.1.2-2.209.el6.x86_64 > > Guest: > I don't use any kernel time modifiers in the guest ... > kernel /vmlinuz-2.6.12 ro root=/dev/VolGroup00/LogVol00 rhgb quiet > > CentOS 4.4 > -- > 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 -- 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
