SUMMARY
Every time I start Dolphin, it crashes. For a brief moment, a ghost window with "Search - Dolphin" written across the title/window bar will appear for a moment before disappearing. The crash is reported by system notification before the ghost window appears.


The crash can be reproduced every time.



~~~ABOUT SYSTEM~~~

Operating System: KDE neon 5.20
KDE Plasma Version: 5.20.5
KDE Frameworks Version: 5.77.0
Qt Version: 5.15.2
Kernel Version: 5.4.0-60-generic
OS Type: 64-bit
Processors: 12 × Intel® Xeon® CPU X5660 @ 2.80GHz
Memory: 7.8 GiB of RAM
Graphics Processor: GeForce GTX 1650/PCIe/SSE2


Application: dolphin (20.12.0)


Qt Version: 5.15.2
Frameworks Version: 5.77.0
Operating System: Linux 5.4.0-60-generic x86_64
Windowing system: X11
Distribution: KDE neon User Edition 5.20



-- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault

[New LWP 91810]
[New LWP 91811]
[New LWP 91812]
[New LWP 91813]
[New LWP 91814]
[New LWP 91815]
[New LWP 91816]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f5bba174aff in __GI___poll (fds=0x7ffef2dfbf68, nfds=1, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29
[Current thread is 1 (Thread 0x7f5bb30278c0 (LWP 91808))]

Thread 8 (Thread 0x7f5b9f65e700 (LWP 91816)):
#0  0x00007f5bb5a7a33d in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f5bb5a2c73a in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5bb5a2d0db in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5bb5a2d2e3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f5bb7ebbfbb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5bb7e601ab in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5bb7c7aa12 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f5bb7c7bbac in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f5bb63fc609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f5bba181293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f5b977fe700 (LWP 91815)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f5b977fdc50, clockid=<optimized out>, expected=0, futex_word=0x563df41f2d10) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f5b977fdc50, clockid=<optimized out>, mutex=0x563df41f2cc0, cond=0x563df41f2ce8) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x563df41f2ce8, mutex=0x563df41f2cc0, abstime=0x7f5b977fdc50) at pthread_cond_wait.c:656
#3  0x00007f5bb7c81ca8 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5bb7c7f1b1 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5bb7c7bbac in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5bb63fc609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f5bba181293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f5b9ffff700 (LWP 91814)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f5b9fffec50, clockid=<optimized out>, expected=0, futex_word=0x563df41f16f0) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f5b9fffec50, clockid=<optimized out>, mutex=0x563df41f16a0, cond=0x563df41f16c8) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x563df41f16c8, mutex=0x563df41f16a0, abstime=0x7f5b9fffec50) at pthread_cond_wait.c:656
#3  0x00007f5bb7c81ca8 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5bb7c7f1b1 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5bb7c7bbac in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5bb63fc609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f5bba181293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f5ba881a700 (LWP 91813)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f5ba8819c50, clockid=<optimized out>, expected=0, futex_word=0x563df411eaa0) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f5ba8819c50, clockid=<optimized out>, mutex=0x563df411ea50, cond=0x563df411ea78) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x563df411ea78, mutex=0x563df411ea50, abstime=0x7f5ba8819c50) at pthread_cond_wait.c:656
#3  0x00007f5bb7c81ca8 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5bb7c7f1b1 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5bb7c7bbac in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5bb63fc609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f5bba181293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f5ba901b700 (LWP 91812)):
#0  futex_abstimed_wait_cancelable (private=<optimized out>, abstime=0x7f5ba901ac50, clockid=<optimized out>, expected=0, futex_word=0x563df4138d40) at ../sysdeps/nptl/futex-internal.h:320
#1  __pthread_cond_wait_common (abstime=0x7f5ba901ac50, clockid=<optimized out>, mutex=0x563df4138cf0, cond=0x563df4138d18) at pthread_cond_wait.c:520
#2  __pthread_cond_timedwait (cond=0x563df4138d18, mutex=0x563df4138cf0, abstime=0x7f5ba901ac50) at pthread_cond_wait.c:656
#3  0x00007f5bb7c81ca8 in QWaitCondition::wait(QMutex*, QDeadlineTimer) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5bb7c7f1b1 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5bb7c7bbac in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5bb63fc609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f5bba181293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f5bb1498700 (LWP 91811)):
#0  0x00007f5bba174aff in __GI___poll (fds=0x7f5ba4015390, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f5bb5a2d1ae in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f5bb5a2d2e3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f5bb7ebbfbb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f5bb7e601ab in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5bb7c7aa12 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f5bb8f11f4b in ?? () from /lib/x86_64-linux-gnu/libQt5DBus.so.5
#7  0x00007f5bb7c7bbac in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f5bb63fc609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f5bba181293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f5bb2267700 (LWP 91810)):
#0  0x00007f5bba174aff in __GI___poll (fds=0x7f5bb2266be8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f5bb6630c1a in ?? () from /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f5bb663290a in xcb_wait_for_event () from /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f5bb2993d58 in ?? () from /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f5bb7c7bbac in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f5bb63fc609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f5bba181293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f5bb30278c0 (LWP 91808)):
[KCrash Handler]
#4  0x00007f5bb9ed763b in KUrlNavigator::locationUrl(int) const () from /lib/x86_64-linux-gnu/libKF5KIOFileWidgets.so.5
#5  0x00007f5bba2bdaf8 in DolphinViewContainer::setSearchModeEnabled (this=this@entry=0x563df44a63c0, enabled=true) at /usr/include/c++/9/bits/atomic_base.h:413
#6  0x00007f5bba2bf399 in DolphinViewContainer::DolphinViewContainer (this=0x563df44a63c0, url=..., parent=<optimized out>) at ./src/dolphinviewcontainer.cpp:188
#7  0x00007f5bba2c5c45 in DolphinTabPage::createViewContainer (this=this@entry=0x563df45aca60, url=...) at ./src/dolphintabpage.cpp:432
#8  0x00007f5bba2c5f4f in DolphinTabPage::DolphinTabPage (this=0x563df45aca60, primaryUrl=..., secondaryUrl=..., parent=<optimized out>) at ./src/dolphintabpage.cpp:34
#9  0x00007f5bba2c8234 in DolphinTabWidget::openNewTab (this=this@entry=0x563df3efc6a0, primaryUrl=..., secondaryUrl=..., tabPlacement=tabPlacement@entry=DolphinTabWidget::AfterLastTab) at ./src/dolphintabwidget.cpp:162
#10 0x00007f5bba2c8422 in DolphinTabWidget::openNewActivatedTab (this=0x563df3efc6a0, primaryUrl=..., secondaryUrl=...) at ./src/dolphintabwidget.cpp:154
#11 0x00007f5bba2c8549 in DolphinTabWidget::openNewActivatedTab (this=this@entry=0x563df3efc6a0) at ./src/dolphintabwidget.cpp:139
#12 0x00007f5bba2c96f0 in DolphinTabWidget::readProperties (this=0x563df3efc6a0, group=...) at ./src/dolphintabwidget.cpp:88
#13 0x00007f5bb95d6080 in KMainWindow::readPropertiesInternal(KConfig*, int) () from /lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#14 0x00007f5bb95d60cb in KMainWindow::restore(int, bool) () from /lib/x86_64-linux-gnu/libKF5XmlGui.so.5
#15 0x00007f5bba2a5abf in kdemain (argc=<optimized out>, argv=<optimized out>) at ./src/main.cpp:201
#16 0x00007f5bba0860b3 in __libc_start_main (main=0x563df2acc060 <main>, argc=1, argv=0x7ffef2dfcce8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffef2dfccd8) at ../csu/libc-start.c:308
#17 0x0000563df2acc09e in _start ()
[Inferior 1 (process 91808) detached]

Possible duplicates by query: bug 430758, bug 430631, bug 430434, bug 429628, bug 427418.

Report to https://bugs.kde.org/