unity8-dash crash when tapping on a scope in the overview without network connection

[Jean-Baptiste Lallement]

TEST CASE:
1. On krillin rtm 14.09 #1, flash with --wipe do not configure Wifi
2. On the apps scope, bottom swipe to open the overview
3. Go the the 'All scopes' category
4. Tap on Amazon

ACTUAL RESULT
unity8-dash crashes (it's https://errors.ubuntu.com/oops/16ffcc92-3e3e-11e4-ade9-fa163e78b027 but there is no stacktrace)

EXPECTED RESULT
The Amazon scope opens and tells the user there is no network connection or scope requiring a network connection are greyed or something but in any case unity8-dash doesn't crash.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: unity8 8.00+14.10.20140908.1~rtm-0ubuntu1 [origin: Ubuntu RTM]
Uname: Linux 3.4.67 armv7l
ApportVersion: 2.14.7-0ubuntu1
Architecture: armhf
Date: Wed Sep 17 08:10:54 2014
InstallationDate: Installed on 2014-09-16 (1 days ago)
InstallationMedia: Ubuntu Utopic Unicorn (development branch) - armhf (20140916-030205)
SourcePackage: unity8
UpgradeStatus: No upgrade log present (probably fresh install)

[Albert Astals Cid (aacid)]

no stack trace? :/

[Albert Astals Cid (aacid)]

Doesn't crash here :/

[Jean-Baptiste Lallement (jibel)]

marking incomplete until I find a reliable test case

[Victor Tuson Palau (vtuson)]

reproduce by Joe and victorp at the first time using flight save mode

[Albert Astals Cid (aacid)]

Ok, my way to reproduce a "similar" crash

go to amazon
enable airplane mode
click something (works, well you get an empty screen, not really "working" but doesn't crash)
disable airplaine mode
click something (crashes)

[Albert Astals Cid (aacid)]

So the backtrace points to a very bad code in QNetworkAccessCacheBackend. I've proposed the upstream fix at https://codereview.qt-project.org/#/c/95245/

Meanwhile i'll recompile qt for the phone with that patch and see if that gets it fixed totally or just partially

[Albert Astals Cid (aacid)]

Yep, that qt patch fixes it, now need to get it accepted upstream and distro patched.

[Albert Astals Cid (aacid)]

The bug is not in declarative.

FWIW the Qt bug is being tracked at https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1371472

[Albert Astals Cid (aacid)]

https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1371472 has now been fixed.