Activity Indicator crashes in QML/Widget mixed applications

[Benjamin Zeller]

ActivityIndicator can crash a application with SEGFAULT, usually at least 2 have to be used on the same view.

The bug seems to only happen in a mixed application, where a QQuickView is used inside a QWidget based application (like the DevicesPage in the Ubuntu QtC plugin) and the QML view is hidden and shown again.

A simple example is available here:

https://code.launchpad.net/~zeller-benjamin/+junk/indicator-crash

I'm on Utopic + Qt 5.3, probably its related to the new Qt version because that problem came up roughly at the same time when we made the switch to
Qt 5.3.

Update:
This was fixed by upstream in Qt 5.3.1, once we get there (or backport the fix) we can remove the workaround

[Benjamin Zeller (zeller-benjamin)]

Added a full backtrace

[Tim Peeters (tpeeters)]

cannot reproduce on trusty with qt 5.2.1

[Benjamin Zeller (zeller-benjamin)]

Created a upstream bug:

https://bugreports.qt-project.org/browse/QTBUG-40111

I was able to reproduce that with Qt 5.3.0 downloaded from qtproject.org.

[Timo Jyrinki (timo-jyrinki)]

The Qt Declarative part is being handled in bug #1356279

[Timo Jyrinki (timo-jyrinki)]

The Qt Declarative got released last Friday so this is fixed in 14.10 and was apparently not present in the Qt 5.2.1 in 14.04 LTS.

[PS Jenkins bot (ps-jenkins)]

Fix committed into lp:ubuntu-ui-toolkit/staging at revision None, scheduled for release in ubuntu-ui-toolkit, milestone Unknown