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amw2320

Member

Registered: 2005-08-14

Posts: 30

Understanding traceback on Plasma crashes

I've been battling multiple crashes daily on plasma. Usually it just restarts but the frequency is aggravating. I have an nvidia card so it does not appear to be related to the intel graphics bug. Trace of the crash makes it look like it has something to do with qt5.

Anyone good at reading these?

Thread 1 (Thread 0x7f4ae4952800 (LWP 940)):
[KCrash Handler]
#5  0x00007f4ae1d572b8 in ?? () from /usr/lib/libQt5Qml.so.5
#6  0x00007f4ae1fcda0a in QQmlDelegateModel::_q_itemsChanged(int, int, QVector<int> const&) () from /usr/lib/libQt5Qml.so.5
#7  0x00007f4ae1fd2622 in QQmlDelegateModel::_q_layoutChanged(QList<QPersistentModelIndex> const&, QAbstractItemModel::LayoutChangeHint) () from /usr/lib/libQt5Qml.so.5
#8  0x00007f4ae1ff50af in ?? () from /usr/lib/libQt5Qml.so.5
#9  0x00007f4ae1ff5868 in QQmlDelegateModel::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libQt5Qml.so.5
#10 0x00007f4adf88a2c0 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#11 0x00007f4adf906cf6 in QAbstractItemModel::layoutChanged(QList<QPersistentModelIndex> const&, QAbstractItemModel::LayoutChangeHint) () from /usr/lib/libQt5Core.so.5
#12 0x00007f4adf82b32c in ?? () from /usr/lib/libQt5Core.so.5
#13 0x00007f4adf82ce08 in ?? () from /usr/lib/libQt5Core.so.5
#14 0x00007f4adf88a10a in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5

amw2320

Member

Registered: 2005-08-14

Posts: 30

Re: Understanding traceback on Plasma crashes

hmm.. After reading some more it looks like I need to install Qt debugging. I'll report  back with more info.

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 78,836

Re: Understanding traceback on Plasma crashes

There isn't much to understand and you won't require additional packages - QML is undebuggable.

"Something™"  caused "some™" model to change and that crashes in a private function in libQml and that's about what you'll usually learn from QML related backtraces.
You're not alone - see https://bugs.kde.org/show_bug.cgi?id=346118 and manymanymany friends.

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amw2320

Member

Registered: 2005-08-14

Posts: 30

Re: Understanding traceback on Plasma crashes

Thanks, I was having trouble getting debugging versions installed. Looks like it may be fixed in Qt 5.6.  I'll be waiting for it to hit the repos.