[Xen-devel] Re: [PATCH][VNC Auth] Fix qemu-dm becomes defunct when rebooting hvm domain

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Fri, Oct 27, 2006 at 05:16:57PM +0100, Keir Fraser wrote:
> On 25/10/06 11:07 pm, "Masami Watanabe" <masami.watanabe@xxxxxxxxxxxxxx>
> wrote:
> 
> > Sorry, I should not have removed infomation on xend.
> > 
> >   image.py, line 399, in configVNC
> >     config.remove(['vncpasswd', vncpasswd_vmconfig])
> > 
> > When vncpasswd is removed, qemu-dm cannot be started in reboot of hvm 
> > domain.
> > Because necessary information disappears.
> > It cannot be helped though information in config list remains in xenstore.
> > 
> > This patch corrects above.
> 
> That would mean that you¹d fall back to the default VNC password though,
> right? Why would it cause qemu to fail to restart and become a defunct
> process?

No, it looks correct to me - we were scrubbing the vncpassword from the
guest config after using it, so that it didn't appear in the SXPR data
with doing 'xm list --long' etc. But turns out we do need the password
later on after all, so we can't scrub it completely. Perhaps we just need
to scrub it out on the fly when talking to XM & other apps instead - i've
already been working on a patch to scrub it out when loggin the guest
data to /var/log/xen/xend.log.

This 'config.remove' thing also impacted my equivalent vncpassword patches
for the paravirt framebuffer, because it meant when you do a save/restore
or a migrate, and started the VNC daemon it no longer found a password.

Not sure why qemu would do defunct though - if the vncpasswd is not set
in xenstore, it ought to have just fallen back to no-password auth.

Dan.
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