Hi Florian!

On Tue, Sep 22, 2020 at 01:48:17PM +0200, Florian Bruhin wrote:
> reassign -1 libqt5webenginecore5 5.14.2+dfsg1-5
> thanks
>
> Hey,
>
> Since you can reproduce this with Falkon, it definitely isn't an issue
> in qutebrowser. Reassigning this to QtWebEngine. Let's hope it works,
> I'm not too experienced with using Debian's BTS - whoever is on the
> receiving end, please let me know if I messed up something :)

I see you ended up sending a mail to cont...@bugs.debian.org. Another way is
sending a mail to the bug itself but prefixing the commands with "Control: ".

> Thanks! For reference, here's a demangled version of the relevant stack
> trace:
>
>     #0  0x00007f6842b6928f 
> blink::CompositedLayerMapping::ComputeBoundsOfOwningLayer(blink::PaintLayer 
> const*, blink::IntRect&, blink::IntRect&, blink::PhysicalOffset&, 
> blink::IntPoint&) (libQt5WebEngineCore.so.5   0x462928f)
>     #1  0x00007f6842b74054 
> blink::CompositedLayerMapping::UpdateGraphicsLayerGeometry(blink::PaintLayer 
> const*, blink::PaintLayer const*, WTF::Vector<blink::PaintLayer*, 0u, 
> WTF::PartitionAllocator>&, blink::GraphicsLayerUpdater::UpdateContext&) 
> (libQt5WebEngineCore.so.5   0x4634054)
>     #2  0x00007f6842b76561 
> blink::GraphicsLayerUpdater::UpdateRecursive(blink::PaintLayer&, 
> blink::GraphicsLayerUpdater::UpdateType, 
> blink::GraphicsLayerUpdater::UpdateContext&, WTF::Vector<blink::PaintLayer*, 
> 0u, WTF::PartitionAllocator>&) (libQt5WebEngineCore.so.5   0x4636561)
>     #3  0x00007f6842b764ca 
> blink::GraphicsLayerUpdater::UpdateRecursive(blink::PaintLayer&, 
> blink::GraphicsLayerUpdater::UpdateType, 
> blink::GraphicsLayerUpdater::UpdateContext&, WTF::Vector<blink::PaintLayer*, 
> 0u, WTF::PartitionAllocator>&) (libQt5WebEngineCore.so.5   0x46364ca)
>     #4  0x00007f6842b764ca 
> blink::GraphicsLayerUpdater::UpdateRecursive(blink::PaintLayer&, 
> blink::GraphicsLayerUpdater::UpdateType, 
> blink::GraphicsLayerUpdater::UpdateContext&, WTF::Vector<blink::PaintLayer*, 
> 0u, WTF::PartitionAllocator>&) (libQt5WebEngineCore.so.5   0x46364ca)
>     #5  0x00007f6842b764ca 
> blink::GraphicsLayerUpdater::UpdateRecursive(blink::PaintLayer&, 
> blink::GraphicsLayerUpdater::UpdateType, 
> blink::GraphicsLayerUpdater::UpdateContext&, WTF::Vector<blink::PaintLayer*, 
> 0u, WTF::PartitionAllocator>&) (libQt5WebEngineCore.so.5   0x46364ca)
>     [...]
>
> From a quick search in QtWebEngine's and Chromium's bugtracker I
> couldn't find anything relevant... I also don't remember seeing this
> stacktrace before.

I also have no clue about this. Unfortunately we build Qt WebEngine without
any debugging information so it is impossible to get the line numbers.
But I see the ComputeBoundsOfOwningLayer method changed between Qt 5.14 and
5.15, so let's see if upgrading to Qt 5.15 helps here (I am working on it).

--
Dmitry Shachnev

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