qgis crashes at startup since upgrading to wily

[hilaire]

I recently upgraded from vivid to wily. Since then, qgis crashed at startup with the following error in the command line. The crash occurs just after displaying "installation de l'interface graphique" and then "vérification des extensions prestataires"
Warning: QGraphicsScene::addItem: item has already been added to this scene
Erreur de segmentation (core dumped)
I tried to uninstall and reinstall, to delete ~/.qgis2 or to launch qgis using the ----noplugins option and it did not change anything. The package version is 2.8.3+dfsg-1 from the repo.
I enclose the result from strace, valgind and backtrace

[hilaire (hilaire-drouineau)]

I solved the problem on my own. The bug was due to a broken ecw driver after wily upgrade. I just reinstalled ecw driver following those instructions and it works again
https://doc.ubuntu-fr.org/qgis#ubuntu_1404_et_suivant