Mediascanner2 crash on model change with header in listview

[Andrew Hayzen]

Hi,

I am experiencing a crash of mediascanner2 when the model changes (eg artist for the AlbumsModel). It appears that I have to have both a delegate and header set in the listview otherwise the error doesn't occur. I have an example [0] which crashes when I select an artist on the left and it attempts to show the albums for that artist on the right.

I have also run this inside GDB [1].

This is was found when migrating the music-app from sheets to pages (as sheets are deprecated). We believe it did not happen before because the sheet was being (de)constructed each time, therefore the model wasn't being changed. Where as a page is just being push/pop'd to and from a pagestack. This issue is now the only thing blocking music-app from migrating to pages.

0 - https://code.launchpad.net/~andrew-hayzen/+junk/mediascanner2-change-model-crash-minimal
1 - http://pastebin.ubuntu.com/7707785/

[Andrew Hayzen (ahayzen)]

Note: So far we have only seen this issue on trusty with the coreapps PPA [2], could the cause be that Qt5.3 is not available in trusty?

2 - https://launchpad.net/~ubuntu-touch-coreapps-drivers/+archive/daily

[James Henstridge (jamesh)]

It doesn't crash for me on Utopic either. Given that mediascanner2 doesn't appear in the trace until frame 40, it does seem likely to be Qt related.

The __cxa_pure_virtual() call happens when a pure virtual method (i.e. one that is defined but not implemented) is called. This is a programming error that usually causes a compilation failure, but there are a few cases where it isn't:

http://stackoverflow.com/questions/99552/where-do-pure-virtual-function-call-crashes-come-from

Presumably one such bug existed in the version of Qt on Trusty?

[Jussi Pakkanen (jpakkane)]

Does this still happen, especially on Utopic?

[Launchpad Janitor (janitor)]

[Expired for mediascanner2 (Ubuntu) because there has been no activity for 60 days.]