Activity Indicator crashes in QML/Widget mixed applications

Bug #1338602 reported by Benjamin Zeller on 2014-07-07
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Ubuntu UI Toolkit
Fix Released
Benjamin Zeller
ubuntu-ui-toolkit (Ubuntu)

Bug Description

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:

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.

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

Related branches

Added a full backtrace

description: updated
Tim Peeters (tpeeters) wrote :

cannot reproduce on trusty with qt 5.2.1

Created a upstream bug:

I was able to reproduce that with Qt 5.3.0 downloaded from

Zsombor Egri (zsombi) on 2014-08-13
Changed in ubuntu-ui-toolkit:
status: New → Confirmed
assignee: nobody → zbenjamin (zeller-benjamin)
importance: Undecided → High
description: updated
Timo Jyrinki (timo-jyrinki) wrote :

The Qt Declarative part is being handled in bug #1356279

Timo Jyrinki (timo-jyrinki) wrote :

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) wrote :

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

Changed in ubuntu-ui-toolkit:
status: Confirmed → Fix Committed
Zoltan Balogh (bzoltan) on 2014-10-01
Changed in ubuntu-ui-toolkit:
status: Fix Committed → Fix Released
Zsombor Egri (zsombi) on 2015-07-14
Changed in ubuntu-ui-toolkit (Ubuntu):
status: New → Fix Released
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