On Tue, Jun 12, 2012 at 6:02 AM, Emmanuel Noobadmin <centos.admin@xxxxxxxxx> wrote: > After removing a USB flash drive using virtual machine manager, I > notice that the core assigned to the VM guest goes up to 100% load. > Within the guest itself, there is no significant activity. > > This also prompted me to look at the other physical machine from which > I used the USB flash drive to transfer files. And it was also > exhibiting the same problem. > > Installed versions are > qemu-kvm-0.12.1.2-2.209.el6_2.5.x86_64 > on CentOS 6.2, 2.6.32-220.17.1.el6.x86_64 (Intel C204 PCH) > > qemu-kvm-0.12.1.2-2.209.el6_2.4.x86_64 > on SLES 6, 2.6.32-220.7.1.el.x86_64 (Intel 82801JI ICH10) > > There are no error messages in the log files and things seem to be > working except for the fully loaded core. > > After some testing, the only steps needed are > 1. VMM add physical host usb device -> select storage to guest > 2. VMM remove hardware > 3. Physically remove the USB storage from the host, thread/core > assigned to guest goes 100% Two clarifications: 1. Can you confirm that the 100% CPU utilization only happens in Step #3? For example, if it happened in Step #2 that would suggest the guest is entering a loop. Step #3 suggests the host is entering a loop. 2. Please run top(1) on the host during high CPU utilization to confirm which process is causing high CPU utilization. CCed Gerd who is USB maintainer. Stefan -- 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
