Re: xen master: xl create hangs

[Mathieu Tarral <mathieu.tarral@xxxxxxxxxxxxxx>]

> I think that this `xl` process just wait for the domain to shutdown
> or die. When we run `xl create`, before exiting there's a fork/exec of
> xl which handle a few domain events, so it looks like this stack trace
> is expected (and look like the one I have). So it don't looks like to be
> the xl process that hangs.

I tested again but this time with XTF test-pv64-example:
https://user-images.githubusercontent.com/964610/180044164-74d12f63-d901-4e33-93be-073c7ed8d7dc.png

This is the new xl stacktrace:
https://gist.github.com/Wenzel/969d5c06982246cd6cb2eb8cdf252a18#file-gdb2-xs-daemon-close-c

It now shows the first thread waiting on the reading thread to join, as we 
expected:
https://github.com/xen-project/xen/blob/0e60f1d9d1970cae49ee9d03f5759f44afc1fdee/tools/libs/store/xs.c#L366

And the second one waiting in read_message:
https://github.com/xen-project/xen/blob/0e60f1d9d1970cae49ee9d03f5759f44afc1fdee/tools/libs/store/xs.c#L1265

Mathieu