[Libguestfs] virt-v2v become zombie via python cpopen on error

Richard W.M. Jones rjones at redhat.com
Wed Mar 30 09:49:32 UTC 2016

On Wed, Mar 30, 2016 at 12:19:35PM +0300, Shahar Havivi wrote:
> Hi,
> We encounter a problem in VDSM project that virt-v2v become zombie task while
> importing vm from vmware.
> When virt-v2v is in 'copy disk' mode and we someone deletes the vm at vmware
> the process hang in read() method,
> I am pretty sure that its not virt-v2v problem because when I run it from the
> shell virt-v2v exit with an error, still maybe someone have an idea....
> I wrote a small python script that encounter the problem:
> ----------------------------------------------------------------------------
> from cpopen import CPopen
> env = {'LIBGUESTFS_BACKEND': 'direct'}
> cmd = ['/usr/bin/virt-v2v', '-ic',
>        'vpx://....', '-o',
>        'local', '-os', '/tmp', '-of', 'raw', '-oa', 'sparse',
>        '--password-file', '/tmp/passwd', '--machine-readable', 'bbb']
> p = CPopen(cmd, env=env)
> while p.returncode is None:
>     c = p.stdout.read(1)
>     print c
> ----------------------------------------------------------------------------

An actual zombie task?  That would indicate that the parent process
(your Python program) wasn't doing a wait system call.

I downloaded the cpopen-1.4 program, and it doesn't appear to call any
of the wait*(2) system calls anywhere, so that could be the problem.


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.

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