Comment 16 for bug 1287943

I see hang at "Base system installed successfully" too, building Trusty VM under Precise 64-bit.

Last three lines of ps auxwww are:

root 20430 0.1 0.0 40060 9716 pts/2 S+ 10:36 0:00 /usr/bin/python /usr/bin/vmbuilder kvm ubuntu --suite trusty --hostname trusty --mem 512 --debug --dest /var/lib/libvirt/images/trusty
root 20432 0.0 0.0 0 0 pts/2 Z+ 10:36 0:00 [debootstrap] <defunct>
root 31685 0.0 0.0 9892 1180 ? Ss 10:37 0:00 udevd --daemon

There is a zombie debootstrap.

# pstree -s 20432
init───sshd───sshd───sshd───bash───sudo───bash───vmbuilder───debootstrap

# ps -o pid,ppid -C debootstrap
  PID PPID
20432 20430

Same backtrace from ctrl-C:

^CTraceback (most recent call last):
  File "/usr/bin/vmbuilder", line 24, in <module>
    cli.main()
  File "/usr/lib/python2.7/dist-packages/VMBuilder/contrib/cli.py", line 216, in main
    distro.build_chroot()
  File "/usr/lib/python2.7/dist-packages/VMBuilder/distro.py", line 83, in build_chroot
    self.call_hooks('bootstrap')
  File "/usr/lib/python2.7/dist-packages/VMBuilder/distro.py", line 67, in call_hooks
    call_hooks(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/VMBuilder/util.py", line 165, in call_hooks
    getattr(context, func, log_no_such_method)(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/VMBuilder/plugins/ubuntu/distro.py", line 136, in bootstrap
    self.suite.debootstrap()
  File "/usr/lib/python2.7/dist-packages/VMBuilder/plugins/ubuntu/dapper.py", line 269, in debootstrap
    run_cmd(*cmd, **kwargs)
  File "/usr/lib/python2.7/dist-packages/VMBuilder/util.py", line 113, in run_cmd
    fds = select.select([x.file for x in [mystdout, mystderr] if not x.closed], [], [])[0]
KeyboardInterrupt

So it's definitely a question of python waiting for data from the child, but the child has gone away.