Dolphin hanged during usage

$ gdb dolphin 14214
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Reading symbols from dolphin...Reading symbols from /usr/lib/debug/usr/bin/dolphin-17.12.1-1.fc27.x86_64.debug...done.
done.
Attaching to program: /usr/bin/dolphin, process 14214
[New LWP 14216]
[New LWP 14217]
[New LWP 14218]
[New LWP 14219]
[New LWP 14220]
[New LWP 14221]
[New LWP 14222]
[New LWP 14223]
[New LWP 14224]
[New LWP 14225]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007f7b2a7c4ad0 in __GI___nanosleep (requested_time=requested_time@entry=0x7ffca2b7dba0, remaining=remaining@entry=0x7ffca2b7dba0)
    at ../sysdeps/unix/sysv/linux/nanosleep.c:27
27        return SYSCALL_CANCEL (nanosleep, requested_time, remaining);
(gdb) thread apply all backtrace

Thread 11 (Thread 0x7f7addbdb700 (LWP 14225)):
#0  0x00007f7b2a7f43db in __GI___poll (fds=0x7f7ad80049b0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f7b220e7e99 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f7ad80049b0, timeout=<optimized out>, context=0x7f7ad8000bf0)
    at gmain.c:4169
#2  g_main_context_iterate (context=context@entry=0x7f7ad8000bf0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3863
#3  0x00007f7b220e7fac in g_main_context_iteration (context=0x7f7ad8000bf0, may_block=may_block@entry=1) at gmain.c:3929
#4  0x00007f7b2b65f33f in QEventDispatcherGlib::processEvents (this=0x7f7ad8000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007f7b2b60d0ea in QEventLoop::exec (this=this@entry=0x7f7addbdac60, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#6  0x00007f7b2b45e8ba in QThread::exec (this=<optimized out>) at thread/qthread.cpp:515
#7  0x00007f7b2b462b92 in QThreadPrivate::start (arg=0x5594346b62e0) at thread/qthread_unix.cpp:368
#8  0x00007f7b26a7561b in start_thread (arg=0x7f7addbdb700) at pthread_create.c:465
#9  0x00007f7b2a80098f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f7afa7fc700 (LWP 14224)):
#0  0x00007f7b26a7bcbb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x559434451ce0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x559434451c90, cond=0x559434451cb8) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x559434451cb8, mutex=0x559434451c90) at pthread_cond_wait.c:655
#3  0x00007f7b0aa1ad8b in cnd_wait (mtx=0x559434451c90, cond=0x559434451cb8) at ../../include/c11/threads_posix.h:159
#4  util_queue_thread_func (input=input@entry=0x559434454030) at u_queue.c:171
#5  0x00007f7b0aa1aca7 in impl_thrd_routine (p=<optimized out>) at ../../include/c11/threads_posix.h:87
#6  0x00007f7b26a7561b in start_thread (arg=0x7f7afa7fc700) at pthread_create.c:465
#7  0x00007f7b2a80098f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
---Type <return> to continue, or q <return> to quit---

Thread 9 (Thread 0x7f7afaffd700 (LWP 14223)):
#0  0x00007f7b26a7bcbb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x559434451ce0) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x559434451c90, cond=0x559434451cb8) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x559434451cb8, mutex=0x559434451c90) at pthread_cond_wait.c:655
#3  0x00007f7b0aa1ad8b in cnd_wait (mtx=0x559434451c90, cond=0x559434451cb8) at ../../include/c11/threads_posix.h:159
#4  util_queue_thread_func (input=input@entry=0x559434452bf0) at u_queue.c:171
#5  0x00007f7b0aa1aca7 in impl_thrd_routine (p=<optimized out>) at ../../include/c11/threads_posix.h:87
#6  0x00007f7b26a7561b in start_thread (arg=0x7f7afaffd700) at pthread_create.c:465
#7  0x00007f7b2a80098f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f7afb7fe700 (LWP 14222)):
#0  0x00007f7b26a7bcbb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x559434451bf8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x559434451ba8, cond=0x559434451bd0) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x559434451bd0, mutex=0x559434451ba8) at pthread_cond_wait.c:655
#3  0x00007f7b0aa1ad8b in cnd_wait (mtx=0x559434451ba8, cond=0x559434451bd0) at ../../include/c11/threads_posix.h:159
#4  util_queue_thread_func (input=input@entry=0x559434453840) at u_queue.c:171
#5  0x00007f7b0aa1aca7 in impl_thrd_routine (p=<optimized out>) at ../../include/c11/threads_posix.h:87
#6  0x00007f7b26a7561b in start_thread (arg=0x7f7afb7fe700) at pthread_create.c:465
#7  0x00007f7b2a80098f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f7afbfff700 (LWP 14221)):
#0  0x00007f7b26a7bcbb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x559434451bf8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
---Type <return> to continue, or q <return> to quit---
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x559434451ba8, cond=0x559434451bd0) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x559434451bd0, mutex=0x559434451ba8) at pthread_cond_wait.c:655
#3  0x00007f7b0aa1ad8b in cnd_wait (mtx=0x559434451ba8, cond=0x559434451bd0) at ../../include/c11/threads_posix.h:159
#4  util_queue_thread_func (input=input@entry=0x559434453630) at u_queue.c:171
#5  0x00007f7b0aa1aca7 in impl_thrd_routine (p=<optimized out>) at ../../include/c11/threads_posix.h:87
#6  0x00007f7b26a7561b in start_thread (arg=0x7f7afbfff700) at pthread_create.c:465
#7  0x00007f7b2a80098f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f7b00b05700 (LWP 14220)):
#0  0x00007f7b26a7bcbb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x559434451bf8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x559434451ba8, cond=0x559434451bd0) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x559434451bd0, mutex=0x559434451ba8) at pthread_cond_wait.c:655
#3  0x00007f7b0aa1ad8b in cnd_wait (mtx=0x559434451ba8, cond=0x559434451bd0) at ../../include/c11/threads_posix.h:159
#4  util_queue_thread_func (input=input@entry=0x559434456220) at u_queue.c:171
#5  0x00007f7b0aa1aca7 in impl_thrd_routine (p=<optimized out>) at ../../include/c11/threads_posix.h:87
#6  0x00007f7b26a7561b in start_thread (arg=0x7f7b00b05700) at pthread_create.c:465
#7  0x00007f7b2a80098f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f7b08c95700 (LWP 14219)):
#0  0x00007f7b26a7bcbb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x7f7b0c004290) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x7f7b0c004240, cond=0x7f7b0c004268) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x7f7b0c004268, mutex=0x7f7b0c004240) at pthread_cond_wait.c:655
#3  0x00007f7b0aa1ad8b in cnd_wait (mtx=0x7f7b0c004240, cond=0x7f7b0c004268) at ../../include/c11/threads_posix.h:159
---Type <return> to continue, or q <return> to quit---
#4  util_queue_thread_func (input=input@entry=0x559434452880) at u_queue.c:171
#5  0x00007f7b0aa1aca7 in impl_thrd_routine (p=<optimized out>) at ../../include/c11/threads_posix.h:87
#6  0x00007f7b26a7561b in start_thread (arg=0x7f7b08c95700) at pthread_create.c:465
#7  0x00007f7b2a80098f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f7b097e9700 (LWP 14218)):
#0  0x00007f7b26a7bcbb in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55943444e318) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55943444e2c8, cond=0x55943444e2f0) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55943444e2f0, mutex=0x55943444e2c8) at pthread_cond_wait.c:655
#3  0x00007f7b0aa1ad8b in cnd_wait (mtx=0x55943444e2c8, cond=0x55943444e2f0) at ../../include/c11/threads_posix.h:159
#4  util_queue_thread_func (input=input@entry=0x559434456200) at u_queue.c:171
#5  0x00007f7b0aa1aca7 in impl_thrd_routine (p=<optimized out>) at ../../include/c11/threads_posix.h:87
#6  0x00007f7b26a7561b in start_thread (arg=0x7f7b097e9700) at pthread_create.c:465
#7  0x00007f7b2a80098f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f7b11b00700 (LWP 14217)):
#0  0x00007f7b2a7f43db in __GI___poll (fds=0x7f7b04012b90, nfds=4, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f7b220e7e99 in g_main_context_poll (priority=<optimized out>, n_fds=4, fds=0x7f7b04012b90, timeout=<optimized out>, context=0x7f7b04000bf0)
    at gmain.c:4169
#2  g_main_context_iterate (context=context@entry=0x7f7b04000bf0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3863
#3  0x00007f7b220e7fac in g_main_context_iteration (context=0x7f7b04000bf0, may_block=may_block@entry=1) at gmain.c:3929
#4  0x00007f7b2b65f33f in QEventDispatcherGlib::processEvents (this=0x7f7b04000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007f7b2b60d0ea in QEventLoop::exec (this=this@entry=0x7f7b11affc20, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
---Type <return> to continue, or q <return> to quit---
#6  0x00007f7b2b45e8ba in QThread::exec (this=this@entry=0x7f7b2d898060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>)
    at thread/qthread.cpp:515
#7  0x00007f7b2d624479 in QDBusConnectionManager::run (this=0x7f7b2d898060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>)
    at qdbusconnection.cpp:178
#8  0x00007f7b2b462b92 in QThreadPrivate::start (arg=0x7f7b2d898060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>)
    at thread/qthread_unix.cpp:368
#9  0x00007f7b26a7561b in start_thread (arg=0x7f7b11b00700) at pthread_create.c:465
#10 0x00007f7b2a80098f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f7b13e2a700 (LWP 14216)):
#0  0x00007f7b2a7f43db in __GI___poll (fds=fds@entry=0x7f7b13e29b68, nfds=nfds@entry=1, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f7b21656fe7 in poll (__timeout=-1, __nfds=1, __fds=0x7f7b13e29b68) at /usr/include/bits/poll2.h:46
#2  _xcb_conn_wait (c=c@entry=0x5594340ca490, cond=cond@entry=0x5594340ca4d0, vector=vector@entry=0x0, count=count@entry=0x0) at xcb_conn.c:479
#3  0x00007f7b21658dda in xcb_wait_for_event (c=0x5594340ca490) at xcb_in.c:693
#4  0x00007f7b15f8ca49 in QXcbEventReader::run (this=0x5594340c9ef0) at qxcbconnection.cpp:1335
#5  0x00007f7b2b462b92 in QThreadPrivate::start (arg=0x5594340c9ef0) at thread/qthread_unix.cpp:368
#6  0x00007f7b26a7561b in start_thread (arg=0x7f7b13e2a700) at pthread_create.c:465
#7  0x00007f7b2a80098f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f7b32e98940 (LWP 14214)):
#0  0x00007f7b2a7c4ad0 in __GI___nanosleep (requested_time=requested_time@entry=0x7ffca2b7dba0, remaining=remaining@entry=0x7ffca2b7dba0)
    at ../sysdeps/unix/sysv/linux/nanosleep.c:27
#1  0x00007f7b2b65ec2d in qt_nanosleep (amount=...) at kernel/qelapsedtimer_unix.cpp:195
---Type <return> to continue, or q <return> to quit---
#2  0x00007f7b2d3a72f8 in KDirWatchPrivate::useFAM (this=this@entry=0x5594345b6d00, e=e@entry=0x55943489c1c0)
    at /usr/src/debug/kf5-kcoreaddons-5.42.0-1.fc27.x86_64/src/lib/io/kdirwatch.cpp:696
#3  0x00007f7b2d3a776b in KDirWatchPrivate::addWatch (this=this@entry=0x5594345b6d00, e=e@entry=0x55943489c1c0)
    at /usr/src/debug/kf5-kcoreaddons-5.42.0-1.fc27.x86_64/src/lib/io/kdirwatch.cpp:983
#4  0x00007f7b2d3a7e55 in KDirWatchPrivate::addEntry (this=0x5594345b6d00, instance=0x55943463ecb0, _path=..., sub_entry=<optimized out>, sub_entry@entry=0x0, 
    isDir=isDir@entry=true, watchModes=...) at /usr/src/debug/kf5-kcoreaddons-5.42.0-1.fc27.x86_64/src/lib/io/kdirwatch.cpp:940
#5  0x00007f7b2d3a9bd2 in KDirWatch::addDir (this=<optimized out>, _path=..., watchModes=..., watchModes@entry=...)
    at /usr/src/debug/kf5-kcoreaddons-5.42.0-1.fc27.x86_64/src/lib/io/kdirwatch.cpp:1882
#6  0x00007f7b31e35f9a in KDirectoryContentsCounter::slotResult (this=0x5594346b61c0, path=..., count=0)
    at /usr/src/debug/dolphin-17.12.1-1.fc27.x86_64/src/kitemviews/private/kdirectorycontentscounter.cpp:112
#7  0x00007f7b2b63791a in QObject::event (this=0x5594346b61c0, e=<optimized out>) at kernel/qobject.cpp:1246
#8  0x00007f7b2c9326ac in QApplicationPrivate::notify_helper (this=this@entry=0x559434089a30, receiver=receiver@entry=0x5594346b61c0, e=e@entry=0x7f7ad8004bc0)
    at kernel/qapplication.cpp:3722
#9  0x00007f7b2c939ef4 in QApplication::notify (this=0x7ffca2b7e470, receiver=0x5594346b61c0, e=0x7f7ad8004bc0) at kernel/qapplication.cpp:3481
#10 0x00007f7b2b60e367 in QCoreApplication::notifyInternal2 (receiver=0x5594346b61c0, event=event@entry=0x7f7ad8004bc0) at kernel/qcoreapplication.cpp:1018
#11 0x00007f7b2b610aeb in QCoreApplication::sendEvent (event=0x7f7ad8004bc0, receiver=<optimized out>) at kernel/qcoreapplication.h:233
#12 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x55943407f4c0) at kernel/qcoreapplication.cpp:1678
#13 0x00007f7b2b611008 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1532
#14 0x00007f7b2b65f553 in postEventSourceDispatch (s=0x5594341149c0) at kernel/qeventdispatcher_glib.cpp:276
#15 0x00007f7b220e7b77 in g_main_dispatch (context=0x7f7b0c004ff0) at gmain.c:3142
#16 g_main_context_dispatch (context=context@entry=0x7f7b0c004ff0) at gmain.c:3795
#17 0x00007f7b220e7f20 in g_main_context_iterate (context=context@entry=0x7f7b0c004ff0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
    at gmain.c:3868
---Type <return> to continue, or q <return> to quit---
#18 0x00007f7b220e7fac in g_main_context_iteration (context=0x7f7b0c004ff0, may_block=may_block@entry=1) at gmain.c:3929
#19 0x00007f7b2b65f33f in QEventDispatcherGlib::processEvents (this=0x559434123720, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#20 0x00007f7b2b60d0ea in QEventLoop::exec (this=this@entry=0x7ffca2b7e370, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212
#21 0x00007f7b2b615744 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1291
#22 0x00007f7b2bfeeddc in QGuiApplication::exec () at kernel/qguiapplication.cpp:1679
#23 0x00007f7b2c932605 in QApplication::exec () at kernel/qapplication.cpp:2910
#24 0x00007f7b32a62d4a in kdemain (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/dolphin-17.12.1-1.fc27.x86_64/src/main.cpp:163
#25 0x00007f7b2a70a00a in __libc_start_main (main=0x5594320f1ab0 <main>, argc=3, argv=0x7ffca2b7e5f8, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7ffca2b7e5e8) at ../csu/libc-start.c:308
#26 0x00005594320f1aea in _start ()

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