[vbox-dev] [ PATCH] Fix crash on startup under Wayland

[Klaus Espenlaub]

Hans,

I can totally understand the pain - but from a different angle we can
ask why Fedora 32 chose to break VirtualBox (which no other distribution
seems to have done to date, and even RHEL8 defaults to Wayland which I
see as excessively optimistic).

Yes, the fix is simple, but in our plan the fix will go first into the
Fedora 32 specific RPM package which we're working on already. Which we
need to do because the Fedora 31 one no longer can be installed on
Fedora 32 (usual dependency problems).

It's simply a risk management question. Who guarantees that the
environment variable tweak will not backfire on some old Qt install?

Klaus

On 2020-05-18 14:58, Hans de Goede wrote:
> Hi,
> 
> On 5/14/20 2:43 PM, Frank Batschulat wrote:
>> Hans, I have filed the following bug to track this:
> 
> Thank you, I wonder though why not ship the next 6.1.z / 6.0.z
> release with my workaround for now?
> 
> Coming up with a proper fix for this is likely going to
> require some time and in the mean time users are being
> bitten by this bug.
> 
> Also given that I reported this serious bug, which basically
> makes VirtualBox completely unusable on default Fedora 32
> installs over a month ago I must say I'm a bit disappointed
> by how VirtualBox upstream is handing this.
> 
> You could have fixed this with the April 14th 6.1.4 release
> by including my 1 line workaround for now. Instead you have
> let users of VirtualBox on Fedora 32 out in the cold.
> 
> Regards,
> 
> Hans
> 
> 
> 
> 
>> [Oracle VM VirtualBox] #19583: GUI crashes when using Qt on Xwayland
>> sessions
>> https://www.virtualbox.org/ticket/19583
>>
>> the possible fix for this is still being discussed internally.
>>
>> On Tue, 07 Apr 2020 14:00:47 +0200, Hans de Goede
>> <hdegoede at redhat.com> wrote:
>>
>>> Hi,
>>>
>>> I noticed that with a default Fedora 32 workstation install (default
>>> GNOME3 on
>>> Wayland session) VirtualBox crashes immediately at startup. The
>>> problem is that
>>> QT5 now defaults to the Wayland backend and VirtualBox assumes the
>>> X11 backend
>>> is used and makes a bunch of unchecked X11 calls which cause NULL
>>> pointer derefs.
>>>
>>> The attached patch is a simple fix which fixes this by setting the QT
>>> backend
>>> back to X11.
>>>
>>> As usual, the patch is released under the MIT license.
>>>
>>> Regards,
>>>
>>> Hans