Comment 1 for bug 1639314

(gdb) bt
#0 0x0000007f730aad58 in QDBusAbstractInterface::asyncCallWithArgumentList(QString const&, QList<QVariant> const&) ()
   from /usr/lib/aarch64-linux-gnu/libQt5DBus.so.5
#1 0x0000007f72dfdac8 in ?? ()
   from /usr/lib/aarch64-linux-gnu/libubuntu-download-manager-client.so.1
#2 0x0000007f40348174 in Ubuntu::DownloadManager::SingleDownload::setAllowMobileDownload(bool) ()
   from /usr/lib/aarch64-linux-gnu/qt5/qml/Ubuntu/DownloadManager/libUbuntuDownloadManager.so
#3 0x0000007f40349f4c in Ubuntu::DownloadManager::SingleDownload::bindDownload(Ubuntu::DownloadManager::Download*) ()
   from /usr/lib/aarch64-linux-gnu/qt5/qml/Ubuntu/DownloadManager/libUbuntuDownloadManager.so
#4 0x0000007f7889a58c in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/aarch64-linux-gnu/libQt5Core.so.5
#5 0x0000007f72e26b44 in Ubuntu::DownloadManager::Manager::downloadCreated(Ubuntu::DownloadManager::Download*) ()
   from /usr/lib/aarch64-linux-gnu/libubuntu-download-manager-client.so.1
#6 0x0000007f72e225b4 in ?? ()
   from /usr/lib/aarch64-linux-gnu/libubuntu-download-manager-client.so.1
#7 0x0000007f7889a58c in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/aarch64-linux-gnu/libQt5Core.so.5
#8 0x0000007f730e552c in QDBusPendingCallWatcher::finished(QDBusPendingCallWatcher*) () from /usr/lib/aarch64-linux-gnu/libQt5DBus.so.5
#9 0x0000007f730e5658 in ?? () from /usr/lib/aarch64-linux-gnu/libQt5DBus.so.5
#10 0x0000000012cfee30 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)