[libguestfs] If qemu process is a shell script, then it is not cleaned
up correctly, even on "good" exit. This is because we need to set up
a new process group (see commented code for doing setpgid).
+[fixed? - added documentation in the manual page that you have to
+do 'exec qemu' in the wrapper. However I still notice that the
+recovery process kills qemu, instead of it being killed by the
+parent process, or at least that's what I think is happening]
[libguestfs] Some occasional data corruption, certainly on tgz-out.
Try using tgz-out on a very large directory.
+[we think this is fixed by 64a6a828bd318622420cf3018899392fd80c14e7]