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

Michal Skrivanek michal.skrivanek at redhat.com
Wed Mar 30 10:36:15 UTC 2016

> On 30 Mar 2016, at 11:49, Richard W.M. Jones <rjones at redhat.com> wrote:
> 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.

I suppose the cpopen parameters are not alright…I’m sure vdsm developers can help with that.

> Rich.
> -- 
> 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.
> http://libguestfs.org/virt-v2v

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