Bug 428396

akonadi_akonotes_resource is using a lot of CPU cores at 100% usage. I attach GDB backtrace 
version 20.08.2
KDE Frameworks 5.75.0
Qt 5.15.1 

$ gdb akonadi_akonotes_resource 3294
GNU gdb (GDB) Fedora 9.2-7.fc33
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Reading symbols from akonadi_akonotes_resource...
Reading symbols from .gnu_debugdata for /usr/bin/akonadi_akonotes_resource...
(No debugging symbols found in .gnu_debugdata for /usr/bin/akonadi_akonotes_resource)
Attaching to program: /usr/bin/akonadi_akonotes_resource, process 3294
[New LWP 3298]
[New LWP 3299]

warning: .dynamic section for "/lib64/libKF5ConfigGui.so.5" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/lib64/libKF5CoreAddons.so.5" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/lib64/libKF5XmlGui.so.5" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/lib64/libKF5WidgetsAddons.so.5" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/lib64/libKF5ItemModels.so.5" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/lib64/libKF5ConfigWidgets.so.5" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/lib64/libKF5Service.so.5" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/usr/lib64/qt5/plugins/platformthemes/KDEPlasmaPlatformTheme.so" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/lib64/libKF5KIOFileWidgets.so.5" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/lib64/libKF5Solid.so.5" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/lib64/libKF5KIOGui.so.5" is not at the expected address (wrong library or version mismatch?)

warning: .dynamic section for "/usr/lib64/qt5/plugins/styles/breeze.so" is not at the expected address (wrong library or version mismatch?)
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007f1bbff2aa0f in poll () from /lib64/libc.so.6
(gdb) set height 0
(gdb) set print elements 0
(gdb) set print frame-arguments all
(gdb) thread apply all backtrace

Thread 3 (Thread 0x7f1ba7fff640 (LWP 3299)):
#0  0x00007f1bbff2aa0f in poll () from /lib64/libc.so.6
#1  0x00007f1bbe859d1e in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007f1bbe80641f in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f1bc04a9a4b in QEventDispatcherGlib::processEvents (this=0x7f1ba0000b60, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f1bc045d65b in QEventLoop::exec (this=0x7f1ba7ffebc0, flags={i = 36}) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#5  0x00007f1bc02cc2e7 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x00007f1bc02cd4bc in QThreadPrivate::start (arg=0x5637d8b0b730) at thread/qthread_unix.cpp:329
#7  0x00007f1bbf0e43f9 in start_thread () from /lib64/libpthread.so.0
#8  0x00007f1bbff35b03 in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f1bacb65640 (LWP 3298)):
#0  0x00007f1bbff2aa0f in poll () from /lib64/libc.so.6
#1  0x00007f1bbe859d1e in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#2  0x00007f1bbe80641f in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f1bc04a9a4b in QEventDispatcherGlib::processEvents (this=0x7f1ba8000b60, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f1bc045d65b in QEventLoop::exec (this=0x7f1bacb64b70, flags={i = 36}) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#5  0x00007f1bc02cc2e7 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x00007f1bc0dcda47 in QDBusConnectionManager::run (this=0x7f1bc0e3b060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:179
#7  0x00007f1bc02cd4bc in QThreadPrivate::start (arg=0x7f1bc0e3b060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:329
#8  0x00007f1bbf0e43f9 in start_thread () from /lib64/libpthread.so.0
#9  0x00007f1bbff35b03 in clone () from /lib64/libc.so.6
^[OM
Thread 1 (Thread 0x7f1bbb4f6e40 (LWP 3294)):
#0  0x00007f1bbff2aa0f in poll () from /lib64/libc.so.6
#1  0x00007f1bbde27640 in QListData::detach_grow(int*, int)@plt () from /lib64/libKF5Crash.so.5
#2  0x00005637d8b85b70 in ?? ()
#3  0x00007fffccf719c0 in ?? ()
#4  0x00007fffccf719c0 in ?? ()
#5  0x0000000100000003 in ?? ()
#6  0x752f6e75722f0001 in ?? ()
#7  0x303030312f726573 in ?? ()
#8  0x5f68736172636b2f in ?? ()
#9  0x00007f0034393233 in ?? ()
#10 0x00005637d8b85b70 in ?? ()
#11 0x0000000000000011 in ?? ()
#12 0x00007fffccf71a20 in ?? ()
#13 0x00007f1bbfe7414e in unsetenv () from /lib64/libc.so.6
#14 0x00007fffccf71a90 in ?? ()
#15 0x00007fffccf71a90 in ?? ()
#16 0xad55705146da9f00 in ?? ()
#17 0x00005637d8b39530 in ?? ()
#18 0x0000000000000013 in ?? ()
#19 0x0000000000000006 in ?? ()
#20 0x0000000000000010 in ?? ()
#21 0x00007fffccf71a90 in ?? ()
#22 0x00007fffccf71a88 in ?? ()
#23 0x00005637d8b39530 in ?? ()
#24 0x00007f1bbde27f57 in KCrash::startProcess (argv=<optimized out>, waitAndExit=<optimized out>, argc=<optimized out>) at /usr/src/debug/kf5-kcrash-5.75.0-1.fc33.x86_64/src/kcrash.cpp:663
#25 0x00007f1bbde2a09a in ?? () from /lib64/libKF5Crash.so.5
#26 0x00005637d8ad06d8 in ?? ()
#27 0x0000000000000000 in ?? ()
(gdb)