tst_quickutils segfaults with Qt 5.2 in qv4functionobject

This is the crash in the latest Qt5.2 - it's a regression in qtdeclarative/v4 by the looks of it since this passed fine before with 5.2.

jsruntime/qv4functionobject.cpp:137: void QV4::FunctionObject::init(QV4::StringRef, bool): Assertion `scope->next != (ExecutionContext *)0x1' failed

This is in tests/unit/tst_components/tst_quickutils.qml either test_modelDelegateHeightForEmptyObjectModelElements or the ListView "list". It may be triggered by code in modules/Ubuntu/Components/plugin/quickutils.cpp.

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

Now fails in different place: https://code.launchpad.net/~ui-toolkit/+archive/ppa/+sourcepub/3810282/+listing-archive-extra

Making some experiments, if I comment out the changeModeD test, it fails in the next one, changeModeH:
https://launchpadlibrarian.net/162928545/buildlog_ubuntu-trusty-amd64.ubuntu-ui-toolkit_1%3A0.1.46%2B14.04.20131216-0~919%2B201401180719~ubuntu14.04.1%2Bdisabletests1_FAILEDTOBUILD.txt.gz

If I comment out all of the changeMode tests, it gets to bug #1256930 about TabBarAPI tests:
https://launchpadlibrarian.net/162929502/buildlog_ubuntu-trusty-amd64.ubuntu-ui-toolkit_1%3A0.1.46%2B14.04.20131216-0~919%2B201401180719~ubuntu14.04.1%2Bdisabletests2_FAILEDTOBUILD.txt.gz

Note that it's however only a single TabBarAPI test. If I comment that single test out, the next failure happens in tst_Layouts:
https://launchpadlibrarian.net/162930347/buildlog_ubuntu-trusty-amd64.ubuntu-ui-toolkit_1%3A0.1.46%2B14.04.20131216-0~919%2B201401180719~ubuntu14.04.1%2Bdisabletests3_FAILEDTOBUILD.txt.gz

After disabling also tst_inversemousearea (seen failing at https://launchpadlibrarian.net/162931483/buildlog_ubuntu-trusty-i386.ubuntu-ui-toolkit_1%3A0.1.46%2B14.04.20131216-0~919%2B201401180719~ubuntu14.04.1%2Bdisabletests4_FAILEDTOBUILD.txt.gz ) I finally get a build through. Note that armhf builds with all tests enabled, this is x86 only (but also seem hard to reproduce on non-PPA machines).

For x86 testing you should be able to use eg. personal PPA just fine.

The "successful" x86 build is visible at:
https://launchpad.net/~canonical-qt5-edgers/+archive/qt5-daily/+sourcepub/3836082/+listing-archive-extra

This seems to be caused by the second QQmlEngine instance used in creating the UbuntuColors and palette object for the Theme context property. Transforming Theme and UbuntuColors into a proper singleton type seems to solve the race.

Fix committed into lp:ubuntu-ui-toolkit at revision 924, scheduled for release in ubuntu-ui-toolkit, milestone Unknown

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

bzr928 truly built without a hitch now, awesome!

https://launchpad.net/~canonical-qt5-edgers/+archive/qt5-beta2/+sourcepub/3882751/+listing-archive-extra

This bug was fixed in the package ubuntu-ui-toolkit - 0.1.46+14.04.20140212-0ubuntu1

---------------
ubuntu-ui-toolkit (0.1.46+14.04.20140212-0ubuntu1) trusty; urgency=low

  [ Andrew Hayzen ]
  * Fixed text not aligned at vertical centre if the listitem height has
    changed dynamically. Fixed no removeItemAnimation if the listitem
    height has been set. (LP: #1263688, #1263682)

  [ CI bot ]
  * Trunk as is, for CI Train release.

  [ William Hua ]
  * Also update LANGUAGE when setLanguage is called for dynamic
    translation. (LP: #1263163). (LP: #1263163)

  [ Timo Jyrinki ]
  * A qtdeclarative5-private-dev packaging change adding a dependency on
    libqt5v8-5-private-dev has been backported to all Ubuntu versions
    now, so this workaround can now be dropped - building both against
    Qt 5.2 and 5.0.2 works.
  * Add #include for QDebug to fix Qt 5.2 build.

  [ Christian Dywan ]
  * Split build and install steps in debian/rules.
  * Use integer Date constructor in date picker tests for Qt 5.2.
  * Run unit_x11 test cases via Xvfb and address failures. (LP:
    #1258017, #1237812, #1242646)
  * Don't redirect output of the input file in itself.
  * Don't try to deploy non-existing qml and js files. (LP: #1259228)
  * Assert textField focus, button visibility and pressed after tapping
    clear.
  * Split documentation for previously group properties. (LP: #1266842)
  * Suppress errors to work-around font error messages. (LP: #1256999)
  * ListItems.Empty's default property needs to be data not children.
    (LP: #1190509)

  [ Pete Woods ]
  * Handle the unity-action-api quit signal. (LP: #1269409)

  [ Zsombor Egri ]
  * Date picker component. Provides full date and month only picking
    functionality.
  * DatePicker test case fix, setting the minimum limit to value that is
    earlier than the date value set. (LP: #1266515)
  * Fixing state restoration when nested dynamic component properties
    are restored. (LP: #1267039)
  * Removing obsolete functionality from QuickUtils. (LP: #1266707)
  * StateSaver failure with Repeater fixed. Indirectly fixes StateSaver
    with ListView and GridView. (LP: #1267900)
  * TabBar test case failure fix for Qt5.2. (LP: #1256930)
  * InverseMouseArea API test removed, being a duplicate of the other
    InverseMouseArea tests. Connecting to th eproper enabledChanged
    signal in InverseMouseArea resolves the warning in Qt5.2 stating
    enabledChanged was overwritten in QQuickMouseArea. (LP: #1266707)
  * Panel implementation for DatePicker. Presents the DatePicker either
    in a panel covering the OSK area or in a Popover, depending on the
    form factor and presence of input method provider.
  * Layout tests now wait for the currentLayout change completion. (LP:
    #1266707)
  * Extra QQmlEngine instance removed from plugin, which seemed to cause
    some race conditions with Qt5.2. As result UbuntuColors got
    transferred from context property into singleton object, Theme's
    palette creation delayed till its first access. (LP: #1266707)
  * DateUtils test failure fix. (LP: #1273893)

  [ Florian Boucault ]
  * Ubuntu UI Toolkit Gallery: reimplemented in a cleaner way the
    respo...