Application: dolphin (17.12.3)

Qt Version: 5.9.5
Frameworks Version: 5.44.0
Operating System: Linux 4.15.0-23-generic x86_64
Distribution: Ubuntu 18.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:
Renamed files .cbr in Konsole and converted JPG images into PDF file in Konsole 
- Unusual behavior I noticed:
About 100 empty system messages (notifications) were hanging at the bottom right corner KDE Panel and on Dolphin icon in Panel
- Custom settings of the application:
usual

The crash can be reproduced every time.

-- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fc4bf6c36c0 (LWP 5371))]

Thread 2 (Thread 0x7fc4a5d0e700 (LWP 5373)):
#0  0x00007fc4bef3bbf9 in __GI___poll (fds=0x7fc49801ac30, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fc4b1e91439 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fc4b1e9154c in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fc4b914f90b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fc4b90f49ea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fc4b8f1322a in QThread::exec() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fc4b95ccd45 in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007fc4b8f1816d in  () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fc4b40026db in start_thread (arg=0x7fc4a5d0e700) at pthread_create.c:463
#9  0x00007fc4bef4888f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fc4bf6c36c0 (LWP 5371)):
[KCrash Handler]
#6  0x0000557cab623ec0 in  ()
#7  0x00007fc4baf99606 in  () at /usr/lib/x86_64-linux-gnu/libKF5Notifications.so.5
#8  0x00007fc4baf996a9 in  () at /usr/lib/x86_64-linux-gnu/libKF5Notifications.so.5
#9  0x00007fc4b912319b in QObjectPrivate::deleteChildren() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fc4b912c9cb in QObject::~QObject() () at /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fc4baf73579 in  () at /usr/lib/x86_64-linux-gnu/libKF5Notifications.so.5
#12 0x00007fc4bee6a041 in __run_exit_handlers (status=0, listp=0x7fc4bf212718 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at exit.c:108
#13 0x00007fc4bee6a13a in __GI_exit (status=<optimized out>) at exit.c:139
#14 0x00007fc4bee48b9e in __libc_start_main (main=0x557ca92db730, argc=1, argv=0x7ffd71c3e188, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd71c3e178) at ../csu/libc-start.c:344
#15 0x0000557ca92db76a in _start ()

Reported using DrKonqi