Comment 2 for bug 1639790

(gdb) bt
#0 0x0000007facd21d58 in QDBusAbstractInterface::asyncCallWithArgumentList(QString const&, QList<QVariant> const&) ()
   from /usr/lib/aarch64-linux-gnu/libQt5DBus.so.5
#1 0x0000007faca74ac8 in ?? ()
   from /usr/lib/aarch64-linux-gnu/libubuntu-download-manager-client.so.1
#2 0x0000007f31f8e174 in Ubuntu::DownloadManager::SingleDownload::setAllowMobileDownload(bool) ()
   from /usr/lib/aarch64-linux-gnu/qt5/qml/Ubuntu/DownloadManager/libUbuntuDownloadManager.so
#3 0x0000007f31f8ff4c in Ubuntu::DownloadManager::SingleDownload::bindDownload(Ubuntu::DownloadManager::Download*) ()
   from /usr/lib/aarch64-linux-gnu/qt5/qml/Ubuntu/DownloadManager/libUbuntuDownloadManager.so
#4 0x0000007fb251158c in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/aarch64-linux-gnu/libQt5Core.so.5
#5 0x0000007faca9db44 in Ubuntu::DownloadManager::Manager::downloadCreated(Ubuntu::DownloadManager::Download*) ()
   from /usr/lib/aarch64-linux-gnu/libubuntu-download-manager-client.so.1
#6 0x0000007faca995b4 in ?? ()
   from /usr/lib/aarch64-linux-gnu/libubuntu-download-manager-client.so.1
#7 0x0000007fb251158c in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/aarch64-linux-gnu/libQt5Core.so.5
#8 0x0000007facd5c52c in QDBusPendingCallWatcher::finished(QDBusPendingCallWatcher*) () from /usr/lib/aarch64-linux-gnu/libQt5DBus.so.5
#9 0x0000007facd5c658 in ?? () from /usr/lib/aarch64-linux-gnu/libQt5DBus.so.5
#10 0x00000000209d02a0 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)