[Akonadi] [Bug 398918] Akonadi server crashes after enabling Notification Monitor

[Christoph Feck]

https://bugs.kde.org/show_bug.cgi?id=398918

--- Comment #1 from Christoph Feck <cfeck at kde.org> ---
Pasting relevant part of backtrace from comment #0:

Thread 3 (Thread 0x7fcbed5f5700 (LWP 27402)):
[KCrash Handler]
#6  std::__atomic_base<QtSharedPointer::ExternalRefCountData*>::load
(__m=std::memory_order_relaxed, this=<optimized out>) at
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include/g++-v7/bits/atomic_base.h:713
#7  std::atomic<QtSharedPointer::ExternalRefCountData*>::load
(__m=std::memory_order_relaxed, this=<optimized out>) at
/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include/g++-v7/atomic:452
#8 
QAtomicOps<QtSharedPointer::ExternalRefCountData*>::load<QtSharedPointer::ExternalRefCountData*>
(_q_value=...) at
../../include/QtCore/../../src/corelib/arch/qatomic_cxx11.h:227
#9  QBasicAtomicPointer<QtSharedPointer::ExternalRefCountData>::load
(this=<optimized out>) at
../../include/QtCore/../../src/corelib/thread/qbasicatomic.h:238
#10 QtSharedPointer::ExternalRefCountData::getAndRef (obj=obj at entry=0x0) at
tools/qsharedpointer.cpp:1445
#11 0x00005626c27c9fd1 in
QWeakPointer<QObject>::QWeakPointer<Akonadi::Server::NotificationSubscriber>
(ptr=0x0, this=<synthetic pointer>) at
/usr/include/qt5/QtCore/qsharedpointer_impl.h:684
#12 QPointer<Akonadi::Server::NotificationSubscriber>::QPointer (p=0x0,
this=<synthetic pointer>) at /usr/include/qt5/QtCore/qpointer.h:71
#13 Akonadi::Server::NotificationSubscriber::notify (this=this at entry=0x0,
notification=...) at
/var/tmp/portage/kde-apps/akonadi-18.04.3/work/akonadi-18.04.3/src/server/notificationsubscriber.cpp:646
#14 0x00005626c27c2ca6 in
Akonadi::Server::NotificationManager::emitPendingNotifications
(this=0x5626c2b76230) at
/var/tmp/portage/kde-apps/akonadi-18.04.3/work/akonadi-18.04.3/src/server/notificationmanager.cpp:226
#15 0x00007fcbf99890a7 in QtPrivate::QSlotObjectBase::call (a=0x7fcbed5f4500,
r=0x5626c2b76230, this=0x7fcbe0005120) at
../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:101
#16 QMetaObject::activate (sender=sender at entry=0x7fcbe0004f00,
signalOffset=<optimized out>, local_signal_index=local_signal_index at entry=0,
argv=argv at entry=0x7fcbed5f4500) at kernel/qobject.cpp:3750
#17 0x00007fcbf9989607 in QMetaObject::activate
(sender=sender at entry=0x7fcbe0004f00, m=m at entry=0x7fcbf9da8ec0
<QTimer::staticMetaObject>, local_signal_index=local_signal_index at entry=0,
argv=argv at entry=0x7fcbed5f4500) at kernel/qobject.cpp:3629
#18 0x00007fcbf9995427 in QTimer::timeout (this=this at entry=0x7fcbe0004f00,
_t1=...) at .moc/moc_qtimer.cpp:200
#19 0x00007fcbf9995738 in QTimer::timerEvent (this=0x7fcbe0004f00, e=<optimized
out>) at kernel/qtimer.cpp:255
#20 0x00007fcbf9989c8b in QObject::event (this=0x7fcbe0004f00, e=<optimized
out>) at kernel/qobject.cpp:1269
#21 0x00007fcbf996025a in doNotify (receiver=<optimized out>, event=<optimized
out>) at kernel/qcoreapplication.cpp:1099
#22 0x00007fcbf9960347 in QCoreApplication::notifyInternal2
(receiver=0x7fcbe0004f00, event=event at entry=0x7fcbed5f4680) at
kernel/qcoreapplication.cpp:1024
#23 0x00007fcbf99b0c8b in QCoreApplication::sendEvent (event=0x7fcbed5f4680,
receiver=<optimized out>) at
../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233
#24 QTimerInfoList::activateTimers (this=0x7fcbe0004cf0) at
kernel/qtimerinfo_unix.cpp:643
#25 0x00007fcbf99b1581 in timerSourceDispatch (source=<optimized out>) at
kernel/qeventdispatcher_glib.cpp:182
#26 0x00007fcbf5a4a5a7 in g_main_context_dispatch () from
/usr/lib64/libglib-2.0.so.0
#27 0x00007fcbf5a4a810 in ?? () from /usr/lib64/libglib-2.0.so.0
#28 0x00007fcbf5a4a8bc in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#29 0x00007fcbf99b19bf in QEventDispatcherGlib::processEvents
(this=0x7fcbe0000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#30 0x00007fcbf995f0ba in QEventLoop::exec (this=this at entry=0x7fcbed5f4910,
flags=..., flags at entry=...) at kernel/qeventloop.cpp:212
#31 0x00005626c27c3963 in
Akonadi::Server::NotificationManager::waitForSocketData (this=0x5626c2b76230)
at
/var/tmp/portage/kde-apps/akonadi-18.04.3/work/akonadi-18.04.3/src/server/notificationmanager.cpp:129
#32 0x00007fcbf99954d4 in QtPrivate::QSlotObjectBase::call (a=0x7fcbed5f49c0,
r=<optimized out>, this=<optimized out>) at
../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:101
#33 QSingleShotTimer::timerEvent (this=0x7fcbe00142e0) at kernel/qtimer.cpp:318
#34 0x00007fcbf9989c8b in QObject::event (this=0x7fcbe00142e0, e=<optimized
out>) at kernel/qobject.cpp:1269
#35 0x00007fcbf996025a in doNotify (receiver=<optimized out>, event=<optimized
out>) at kernel/qcoreapplication.cpp:1099
#36 0x00007fcbf9960347 in QCoreApplication::notifyInternal2
(receiver=0x7fcbe00142e0, event=event at entry=0x7fcbed5f4b10) at
kernel/qcoreapplication.cpp:1024
#37 0x00007fcbf99b0c8b in QCoreApplication::sendEvent (event=0x7fcbed5f4b10,
receiver=<optimized out>) at
../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:233
#38 QTimerInfoList::activateTimers (this=0x7fcbe0004cf0) at
kernel/qtimerinfo_unix.cpp:643
#39 0x00007fcbf99b1581 in timerSourceDispatch (source=<optimized out>) at
kernel/qeventdispatcher_glib.cpp:182
#40 0x00007fcbf5a4a5a7 in g_main_context_dispatch () from
/usr/lib64/libglib-2.0.so.0
#41 0x00007fcbf5a4a810 in ?? () from /usr/lib64/libglib-2.0.so.0
#42 0x00007fcbf5a4a8bc in g_main_context_iteration () from
/usr/lib64/libglib-2.0.so.0
#43 0x00007fcbf99b19bf in QEventDispatcherGlib::processEvents
(this=0x7fcbe0000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#44 0x00007fcbf995f0ba in QEventLoop::exec (this=this at entry=0x7fcbed5f4d60,
flags=..., flags at entry=...) at kernel/qeventloop.cpp:212
#45 0x00007fcbf97b7afa in QThread::exec (this=<optimized out>) at
thread/qthread.cpp:515
#46 0x00007fcbf97bbfe5 in QThreadPrivate::start (arg=0x5626c2b488a0) at
thread/qthread_unix.cpp:368
#47 0x00007fcbf7cda92a in start_thread () from /lib64/libpthread.so.0
#48 0x00007fcbf8e36a3f in clone () from /lib64/libc.so.6

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