[Libguestfs] virt-inspector command hung up

[Richard W.M. Jones]

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.

-- 
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