[Development] QtQuickComponents ComboBox with QEglFSWindow

[Matt Broadstone]

On Mon, Apr 14, 2014 at 7:07 AM, Rutledge Shawn <Shawn.Rutledge at digia.com>wrote:

>
> On 11 Apr 2014, at 10:15 PM, Matt Broadstone wrote:
>
> > Hi,
> > We're experiencing an odd crash while running our Qt Quick application
> in a VirtualBox session using eglfs on the framebuffer. The application
> works perfectly passing the '-platform eglfs' options, however, when we try
> to use a ComboBox we get a segfault/qFatal, with the resulting backtrace
> (only first twelve frames included for "brevity"):
> >
> > #0  0x00007eff7c041389 in raise () from /usr/lib/libc.so.6
> > #1  0x00007eff7c042788 in abort () from /usr/lib/libc.so.6
> > #2  0x00007eff7c956895 in qt_message_fatal (context=..., message=...) at
> global/qlogging.cpp:979
> > #3  QMessageLogger::fatal (this=this at entry=0x7fff32b96030, msg=msg at entry=0x7eff7768e380
> "EGLFS: OpenGL windows cannot be mixed with others.") at
> global/qlogging.cpp:384
> > #4  0x00007eff7766cfb7 in QEglFSWindow::create (this=this at entry=0x1db8030)
> at qeglfswindow.cpp:115
> > #5  0x00007eff7766b60e in QEglFSIntegration::createPlatformWindow
> (this=<optimized out>, window=0x1db66f0) at qeglfsintegration.cpp:122
> > #6  0x00007eff7d03180b in QWindow::create (this=this at entry=0x1db66f0)
> at kernel/qwindow.cpp:480
> > #7  0x00007eff7d032150 in QWindow::setVisible (this=0x1db66f0,
> visible=<optimized out>) at kernel/qwindow.cpp:426
> > #8  0x00007eff6c888d6a in QQuickPopupWindow::show (this=this at entry=0x1db66f0)
> at qquickpopupwindow.cpp:95
> > #9  0x00007eff6c888579 in QQuickMenuPopupWindow::show (this=0x1db66f0)
> at qquickmenupopupwindow.cpp:57
> > #10 0x00007eff6c884efb in QQuickMenu::__popup (this=0x1bff2e0,
> x=<optimized out>, y=<optimized out>, atItemIndex=0) at qquickmenu.cpp:403
> > #11 0x00007eff6c897f53 in QQuickMenu::qt_static_metacall (_o=_o at entry=0x1bff2e0,
> _c=_c at entry=QMetaObject::InvokeMetaMethod, _id=_id at entry=22, _a=_a at entry=0x7fff32b96550)
> at .moc/moc_qquickmenu_p.cpp:227
> > #12 0x00007eff6c898427 in QQuickMenu::qt_metacall (this=0x1bff2e0,
> _c=QMetaObject::InvokeMetaMethod, _id=22, _a=0x7fff32b96550) at
> .moc/moc_qquickmenu_p.cpp:330
> >
> > There is some mention on the i.MX6 wiki page about multiple windows (
> http://qt-project.org/wiki/i.MX-6), but that appears to be related to
> mixing Quick views and widgets, which we are not doing. There also seems to
> be an existing ComboBox bug (
> https://bugreports.qt-project.org/browse/QTBUG-35989), but this looks
> like it's quite different.
> >
> > Any insight would be appreciated, I just wanted to do some further
> investigation here before creating the bug report.
>
> What version do you have?  Looks like the combo box is trying to create
> another window for the dropdown list, and we're not allowed to have more
> than one window on eglfs.  I don't think it should be doing that anymore on
> platforms where it's not supported.
>
>
>
Forgot to reply-all on that last one, apologies:

Qt 5.2.1 (built from source off the git v5.2.1 tag), using this configure
line:

./configure -confirm-license -opensource -debug -system-sqlite
-openssl-linked \
            -nomake examples -nomake tests -plugin-sql-psql
-plugin-sql-sqlite \
            -eglfs -no-rpath -optimized-qmake -dbus-linked
-reduce-relocations \
            -opengl es2 -directfb


Running on Arch Linux version 2013.03.01 in VirtualBox 4.3.10 r93012, with
the form:
   ./ourquickapp -platform eglfs

(same thing happens with 5.3 built from source, but this failed related to
a different issue related to unaddressable byes for ioctl, and only works
when run in valgrind)

Please let me know if there's any other information I can provide.
Matt
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