With kdepim-runtime 17.04.1, akonadi_imap_resource always crashes when trying to configure an IMAP account from kmail settings -> accounts. Downgrading to kdepim-runtime 17.04.0 fixes the problem.

Backtrace:
(gdb) bt
#0  MailTransport::ServerTest::normalProtocols (this=0x0) at /build/kmailtransport/src/kmailtransport-17.04.1/src/kmailtransport/servertest.cpp:593
#1  0x0000000000427766 in ?? ()
#2  0x00007fbc943e2cdb in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#3  0x00007fbc955732d2 in QLineEdit::textChanged(QString const&) () from /usr/lib/libQt5Widgets.so.5
#4  0x00007fbc95579909 in ?? () from /usr/lib/libQt5Widgets.so.5
#5  0x00007fbc943e2977 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#6  0x00007fbc955f2d55 in QWidgetLineControl::textChanged(QString const&) () from /usr/lib/libQt5Widgets.so.5
#7  0x00007fbc955f628e in QWidgetLineControl::finishChange(int, bool, bool) () from /usr/lib/libQt5Widgets.so.5
#8  0x00007fbc955f6567 in QWidgetLineControl::internalSetText(QString const&, int, bool) () from /usr/lib/libQt5Widgets.so.5
#9  0x00007fbc95574fa2 in QLineEdit::setText(QString const&) () from /usr/lib/libQt5Widgets.so.5
#10 0x00000000004263d2 in ?? ()
#11 0x000000000042979e in ?? ()
#12 0x000000000042092d in ?? ()
#13 0x000000000043520d in ?? ()
#14 0x00007fbc97982a25 in Akonadi__ControlAdaptor::qt_metacall (this=0x1c24700, _c=QMetaObject::InvokeMetaMethod, _id=4, _a=0x7fff37dcb480)
    at /build/akonadi/src/build/src/agentbase/controladaptor.moc:172
#15 0x00007fbc960576b0 in ?? () from /usr/lib/libQt5DBus.so.5
#16 0x00007fbc9605bf3d in ?? () from /usr/lib/libQt5DBus.so.5
#17 0x00007fbc9605c7e4 in ?? () from /usr/lib/libQt5DBus.so.5
#18 0x00007fbc9605f0ce in ?? () from /usr/lib/libQt5DBus.so.5
#19 0x00007fbc943e3999 in QObject::event(QEvent*) () from /usr/lib/libQt5Core.so.5
#20 0x00007fbc95443a3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#21 0x00007fbc9544b321 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#22 0x00007fbc943b6050 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#23 0x00007fbc943b8b1d in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#24 0x00007fbc9440ba33 in ?? () from /usr/lib/libQt5Core.so.5
#25 0x00007fbc8d7d77b7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#26 0x00007fbc8d7d7a20 in ?? () from /usr/lib/libglib-2.0.so.0
#27 0x00007fbc8d7d7acc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#28 0x00007fbc9440be3f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#29 0x00007fbc943b46ba in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#30 0x00007fbc943bcfa4 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#31 0x00007fbc97969a8e in Akonadi::ResourceBase::init (r=0x1c16920) at /build/akonadi/src/akonadi-17.04.1/src/agentbase/resourcebase.cpp:607
#32 0x0000000000420465 in ?? ()
#33 0x00007fbc9380c511 in __libc_start_main () from /usr/lib/libc.so.6
#34 0x000000000042030a in _start ()