I had a akonadi_maildir_resource crash in Ubuntu disco. I do not see what version number is correct, as the different libakonadi-packages seem to have different version numbers, but none with 5.x

Application: akonadi_maildir_resource (akonadi_maildir_resource), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8e88e39800 (LWP 2778))]

Thread 4 (Thread 0x7f8e7f7fe700 (LWP 2814)):
[KCrash Handler]
#6  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#7  0x00007f8e8cb57535 in __GI_abort () at abort.c:79
#8  0x00007f8e8cdd0642 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#9  0x00007f8e8cddc186 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#10 0x00007f8e8cddc1d1 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#11 0x00007f8e8cf9cdd3 in qTerminate() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007f8e8cf9e7c0 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007f8e8cb14182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#14 0x00007f8e8cc4fb1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f8e7ffff700 (LWP 2805)):
#0  0x00007f8e8cc43729 in __GI___poll (fds=0x7f8e78026410, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f8e8b48bcb6 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8e8b48bddc in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8e8d1de063 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f8e8d1895bb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8e8cfd42c6 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8e8e06a565 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f8e8cfd5612 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8e8cb14182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#9  0x00007f8e8cc4fb1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f8e87b2f700 (LWP 2785)):
#0  0x00007f8e8cc43729 in __GI___poll (fds=0x7f8e87b2eca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f8e8bf5f917 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f8e8bf6153a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f8e8871f6a8 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f8e8cfd5612 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8e8cb14182 in start_thread (arg=<optimized out>) at pthread_create.c:486
#6  0x00007f8e8cc4fb1f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f8e88e39800 (LWP 2778)):
#0  0x00007f8e8b48b1d4 in g_main_context_prepare () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f8e8b48bbeb in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8e8b48bddc in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8e8d1de063 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f8e8d1895bb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8e8d1915e2 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8e8e5bc31e in Akonadi::ResourceBase::init(Akonadi::ResourceBase*) () from /usr/lib/x86_64-linux-gnu/libKF5AkonadiAgentBase.so.5
#7  0x000055eb81799f11 in ?? ()
#8  0x00007f8e8cb58b6b in __libc_start_main (main=0x55eb81799d80, argc=3, argv=0x7ffc99443a28, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc99443a18) at ../csu/libc-start.c:308
#9  0x000055eb81799dba in _start ()
[Inferior 1 (process 2778) detached]