Hi there I am using fedora21 for hosts and guests, using lxc containers, and was on vanilla 1.2.9 as exposed by the fedora yum repo The other day I was needing the ability to grant mknod capability to some guests, some chap on IRC kindly pointed me at the <capabilities> tag However I was told that needed 1.2.11 So I went and rebuilt from this download http://libvirt.org/sources/libvirt-1.2.14-1.fc21.src.rpm using plain rmbuild —rebuild Once I had upgraded my host with these new rpms it looked like everything was going fine, and my guests indeed were able to mknod However once I rebooted the host, virsh unpleasantly refused to start any of my containers, and complained like this after hanging for 5 to 10 seconds: 2015-04-11 07:44:10.295+0000: 37843: error : virLXCProcessStart:1263 : internal error: guest failed to start: libvirt: error : Failed to terminate process 37905 with SIGKILL: Device or resource busy — At that point I redid the same with 1.2.13, which gave me the same behaviour, and then 1.2.12 which seems to work for me right now — So it looks like 1.2.13 brings me a regression of some kind I am attaching the XML config for one sample domain, mostly they all look alike Should I file a bug report, and if so where should I do that ? thanks — root@buzzcocks ~ # virsh -c lxc:/// dumpxml testmaster setlocale: No such file or directory <domain type='lxc' id='1528'> <name>testmaster</name> <uuid>18989592-f964-4d51-90af-7ecf7719b758</uuid> <memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>1048576</currentMemory> <vcpu placement='auto'>1</vcpu> <numatune> <memory mode='strict' placement='auto'/> </numatune> <resource> <partition>/machine</partition> </resource> <os> <type arch='x86_64'>exe</type> <init>/sbin/init</init> </os> <features> <acpi/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/libexec/libvirt_lxc</emulator> <filesystem type='mount' accessmode='passthrough'> <source dir='/vservers/testmaster'/> <target dir='/'/> </filesystem> <interface type='bridge'> <mac address='52:54:00:ae:8b:47'/> <source bridge='br0'/> <target dev='viftestmaster'/> <guest dev='eth0'/> </interface> <console type='pty' tty='/dev/pts/0'> <source path='/dev/pts/0'/> <target type='lxc' port='0'/> <alias name='console0'/> </console> </devices> </domain>