On Sun, Mar 12, 2017 at 02:28:30PM +0800, power off wrote:

Hi, I met a problem when using libguestfs-1.28.1 (centos 7.1) on a virtual machine. Execute virt-inspector command to get OS information and the command hangs .

....................... Launching appliance, timeout set to 600 seconds libguestfs: launch: program=virt-inspcetor libguestfs: launch: version=1.28.1rhel=7,release=1.18.el7,libvirt libguestfs: launch: backend registered: unix libguestfs: launch: backend registered: uml libguestfs: launch: backend registered: libvirt libguestfs: launch: backend registered: direct libguestfs: launch: backend=libvirt libguestfs: launch: tmpdir=/tmp/libguestfsQp28Qo libguestfs: launch: umask=0027 libguestfs: launch: euid=2016 libguestfs: libvirt version = 1002008 (1.2.8) libguestfs: guest random name = guestfs-w8hcve9rhu0dve4a libguestfs: [00000ms] connect to libvirt libguestfs: opening libvirt handle: URI = qemu://session, auth = default+wrapper, flags = 0

command hung on here.We review the libguestfs soure code It seems that libguestfs call libvirt API virConnetOpenAuth failed but no returns.

And I set LIBVIRT_DEBUG=debug,and execute virt-inspect command again. I find the command hung after function virFileFindResourceFull from libvirt debug log. ......... 2017-03-11 07:19:09.246+000: 114046: debug: doRemoteOpen:882 : Peoceeding with sockname /run/user/2016/libvirt/libvirt-sock 2017-03-11 07:19:09.246+000: 114046: debug: virFileFindResourceFull:1608 : Resolved 'libvirtd' to ‘/usr/sbin/libvirtd’

there is no more debug log.

euid=2016, so you're not running this as root. So it seems as if the session libvirtd cannot be run for some reason. Have a look if there are any `libvirtd --timeout=30' processes running (and kill them if there are).

System run well about half of a year before this problem happened.

Any ideas?

You might try CentOS 7.3, since newer versions of libvirt generally get bugs fixed.

PS: can I reboot virtual machine to resume it?

If you mean the libguestfs appliance, then no. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-df lists disk usage of guests without needing to install any software inside the virtual machine. Supports Linux and Windows. http://people.redhat.com/~rjones/virt-df/