[Bug 49764] New: Every program using virtual desktop crashes on startup after a recent Mesa snapshot added a second Vulkan device

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49764

            Bug ID: 49764
           Summary: Every program using virtual desktop crashes on startup
                    after a recent Mesa snapshot added a second Vulkan
                    device
           Product: Wine
           Version: 5.15
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs at winehq.org
          Reporter: subgraph93 at gmail.com
      Distribution: ---

Distribution: Ubuntu 20.04.1

Filing this report here because I think a Wine issue may be present. A specific
Wine setting always triggers the issue, and other configurations (Wine without
it or native programs) did not trigger the issue. I apologize for taking your
time if it's a purely Mesa issue.

An update to a newer Mesa snapshot (Git acf756a -> Git a27823e) has introduced
a new Vulkan device for vallium/llvmpipe (software renderer). As a result, I
have two "GPUs", and after the Mesa update, I found that programs running in
virtual desktop now crash at startup. I believe the update and the issue to be
related.

I tested it on winecfg in a clean wineprefix. (I backed up the usual ~/.wine,
ran `wine winecfg` to create the prefix, turned virtual desktop mode on by
default, closed winecfg, then ran `wine winecfg` again.) These two lines seem
to be always output:
0024:err:module:LdrInitializeThunk "comctl32.dll" failed to initialize,
aborting
0024:err:module:LdrInitializeThunk Initializing dlls for
L"C:\\windows\\system32\\winecfg.exe" failed, status c0000005

This issue affects both 5.15 and 5.16, both devel and staging for me.

I know that more information is likely needed (probably logs with debug
channels, or vulkaninfo?), not sure what I need to provide though. I have
+relay,+seh logs of the tests with winecfg (as said above) for 5.15-devel and
5.16-devel.

#49631 may be related?

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