So after three days of debugging I've been able to figure out why it is crashing, why it's random and i can provide a quick workaround in unity8 code.
## Why is it crashing? ## The problem exists because we use the QML cache and because Qt has this bug https://bugreports.qt.io/browse/QTBUG-47709 The bug in Qt means that if for types with extended properties (Image and "source" in our case coming from the SDK) an Item is created before the type is extended, all subsquent items of the same type won't see the extended property either. Since we're using the QML cache this means that the code loaded from the cache expects the extended property to be there, so when it access such property, it will crash. ## Why is it random? ## It's random because the QML file loading is not always done in the *exact* same order, and thus in some cases the first Image is created in a file that imports Ubuntu.Components and in some cases the first image is created in a file that does not. ## How to workaround it? ## A quick workaround is making sure Ubuntu.Components is imported in the first file that is imported, in unity8's case UnityInputInfo.qml that is a singleton imported from the root file (OrientedShell.qml) ** Changed in: unity8 (Ubuntu) Status: Confirmed => In Progress -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unity8 in Ubuntu. https://bugs.launchpad.net/bugs/1473471 Title: unity8 crashes on boot Status in Canonical System Image: Confirmed Status in unity8 package in Ubuntu: In Progress Bug description: On rc-proposed/bq-aquaris.en/krillin #64 and rc- proposed/meizu.en/arale #56 unity8 often crashes on boot, introducing a long delay while apport is doing its work. The process respawns and there doesn't seem to be any impact after boot. Report on errors.u.c: https://errors.ubuntu.com/oops/34eea84c-270c- 11e5-a0a8-fa163e5bb1a2 Most of the time maliit-server also crashes. I reported bug 1473469 How to reproduce the crash: * Make sure your /var/crash in the phone is empty * run in the desktop while [ true ]; do echo "Checking if there is crash files"; output=`adb shell ls /var/crash`; if [ "x$output" != "x" ]; then break; fi; echo "No crash files, Rebooting"; adb reboot; echo "Sleeping for 100 seconds"; echo ""; sleep 100; done Will stop because crash files have been generated in about 5 iterations To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1473471/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
