Hi everyone,

I have problem with my kmail (ver. 4.8.0). When I try run kmail I get all the time this error:

QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
Enchant dict for "pl_PL" 0xab4f00
Enchant dict for "pl_PL" 0xd7d070
Enchant dict for "pl_PL" 0x203cb30
Enchant dict for "pl_PL" 0x22ad180
*** KMail got signal 11 (Exiting)
*** Dead letters dumped.
unnamed app(21896): Communication problem with "kmail2" , it probably crashed.
Error message was: "org.freedesktop.DBus.Error.NoReply" : " "Message did not receive a reply (timeout by message bus)" "

KCrash: Attempting to start /usr/lib64/kde4/libexec/drkonqi from kdeinit
sock_file=/home/spysz/.kde4/socket-cessna/kdeinit4__0

I have tried looked for solution, but any success. I don't know what could cause this problem, because I did't upgrade any sensitive package or something like that. Just, stop working without reason. ;-(

Does anyone know a solution? Please help me!

Best regards,
Simon

What type of operation are you attempting to do when you recieve this crash?

I've got this problem as well.
KMail crashes on startup with the following:
*** KMail got signal 11 (Exiting)
*** Dead letters dumped.

Ok, I have a solution:

Delete any files in the autosave folder:
rm ~/.kde4/share/apps/kmail2/autosave/*

Hope that helps.

to herring42

yes indeed it helps.

Thanks mate

I'm having the same problem and I didn't have any files in /.kde/share/apps/kmail2/autosave/

Any other ideas?

Have you tried looking at ~/.kde/share/apps/kmail/autosave/
Also, depending on the distribution, you may need to swap ~/.kde/ for ~/.kde4/

bcooksley wrote:Have you tried looking at ~/.kde/share/apps/kmail/autosave/
Also, depending on the distribution, you may need to swap ~/.kde/ for ~/.kde4/

Yes I'm aware of that. I only have .kde on my system. I'm on kubuntu oneiric using kubuntu-backports ppa. I upgraded this morning to kde 4.8.1 against my better judgement and now kmail constantly crashes just scrolling through the message list. I have removed all of the mail filters have been reported to cause problems.

Can you please post a backtrace (from the Developer Information tab of the Crash Assistant) here?

bcooksley wrote:Can you please post a backtrace (from the Developer Information tab of the Crash Assistant) here?

It might help to note I use IMAP exclusively and it happens every time i switch from one imap inbox to another and then scroll or click on a message.

Backtrace:

Application: KMail (kmail), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f8dce9197c0 (LWP 12008))]

Thread 6 (Thread 0x7f8dada13700 (LWP 12012)):
#0 0x00007f8dc982704c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007f8dc0d34c2c in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2 0x00007f8dc0d34d59 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3 0x00007f8dc9822efc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4 0x00007f8dcbc8b89d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f8dad112700 (LWP 12013)):
#0 0xffffffffff60014a in ?? ()
#1 0x00007f8dad111b00 in ?? ()
#2 0x00007fff2f5ff7e7 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 4 (Thread 0x7f8d66395700 (LWP 12016)):
#0 0x00007f8dcc610709 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#1 0x00007f8dcc60f0dc in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2 0x00007f8dcc60f185 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3 0x00007f8dc461bff2 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4 0x00007f8dc461cdfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5 0x00007f8dc461d429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6 0x00007f8dcc60fc06 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7 0x00007f8dcc5df3e2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8 0x00007f8dcc5df637 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9 0x00007f8dcc4df067 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#10 0x00007f8dcc5bf17f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#11 0x00007f8dcc4e208b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#12 0x00007f8dc9822efc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#13 0x00007f8dcbc8b89d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#14 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f8d64c60700 (LWP 12142)):
[KCrash Handler]
#6 0x00007f8dcbc22dbc in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#7 0x00007f8dcbc23dff in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#8 0x00007f8dcbc2677d in malloc () from /lib/x86_64-linux-gnu/libc.so.6
#9 0x00007f8dcc4e4088 in QByteArray::realloc(int) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#10 0x00007f8dcc4e41a9 in QByteArray::resize(int) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#11 0x00007f8dcace8a06 in QAbstractSocket::writeData(char const*, long long) () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#12 0x00007f8dcc5734af in QIODevice::write(char const*, long long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#13 0x00007f8dbe264095 in ?? () from /usr/lib/libsopranoclient.so.1
#14 0x00007f8dbe26a28a in ?? () from /usr/lib/libsopranoclient.so.1
#15 0x00007f8dbe26ba03 in ?? () from /usr/lib/libsopranoclient.so.1
#16 0x00007f8dc505e0b2 in ?? () from /usr/lib/libnepomuk.so.4
#17 0x00007f8dc504e083 in ?? () from /usr/lib/libnepomuk.so.4
#18 0x00007f8dc504e95c in ?? () from /usr/lib/libnepomuk.so.4
#19 0x00007f8dc5062893 in Nepomuk::Resource::property(QUrl const&) const () from /usr/lib/libnepomuk.so.4
#20 0x00007f8dc83c17da in ?? () from /usr/lib/libmessagecore.so.4
#21 0x00007f8dcc4d55b2 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#22 0x00007f8dcc4e208b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#23 0x00007f8dc9822efc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#24 0x00007f8dcbc8b89d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#25 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f8d67581700 (LWP 12162)):
#0 0x00007f8dc98273cb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007f8dcc4e24ff in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2 0x00007f8dcc4d567f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3 0x00007f8dcc4e208b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4 0x00007f8dc9822efc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007f8dcbc8b89d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f8dce9197c0 (LWP 12008)):
#0 0x00007f8dcbc99b8e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007f8dcbc289df in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007f8dcbc26d71 in free () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x00007f8dca35e91e in ?? () from /usr/lib/x86_64-linux-gnu/libQtDBus.so.4
#4 0x00007f8dcc5f1009 in QMetaCallEvent::~QMetaCallEvent() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5 0x00007f8dcc5f1069 in QMetaCallEvent::~QMetaCallEvent() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6 0x00007f8dcc5e43d3 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7 0x00007f8dcc60f773 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8 0x00007f8dc461ca5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9 0x00007f8dc461d258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f8dc461d429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f8dcc60fb9f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#12 0x00007f8dccba821e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#13 0x00007f8dcc5df3e2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#14 0x00007f8dcc5df637 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#15 0x00007f8dcc5e46c7 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#16 0x0000000000402bd3 in ?? ()
#17 0x00007f8dcbbcb30d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#18 0x00000000004030b5 in _start ()

This crash appears to be a seperate issue - caused by a Crash in Nepomuk.

bcooksley wrote:This crash appears to be a seperate issue - caused by a Crash in Nepomuk.

Disabling nepomuk seems to have helped. it took a lot longer to crash this time. Perhaps the nepomuk crash is symptomatic of a bug in an underlying layer.

Here's another stack trace:

Application: KMail (kmail), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f2ce5ea27c0 (LWP 5733))]

Thread 10 (Thread 0x7f2cc4f9c700 (LWP 5736)):
#0 0x00007f2ce0db004c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007f2cd82bdc2c in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2 0x00007f2cd82bdd59 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3 0x00007f2ce0dabefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4 0x00007f2ce321489d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5 0x0000000000000000 in ?? ()

Thread 9 (Thread 0x7f2cc469b700 (LWP 5737)):
#0 0x00007f2ce3208773 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007f2cdbba5f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007f2cdbba6429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007f2ce3b98c06 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4 0x00007f2ce3b683e2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5 0x00007f2ce3b68637 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6 0x00007f2ce3a68067 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7 0x00007f2ce3a6b08b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8 0x00007f2ce0dabefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#9 0x00007f2ce321489d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7f2cc210d700 (LWP 5738)):
#0 0x00007f2ce3208773 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007f2cdbba5f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007f2cdbba6429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007f2ce3b98c06 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4 0x00007f2ce3b683e2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#5 0x00007f2ce3b68637 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#6 0x00007f2ce3a68067 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#7 0x00007f2ce3b4817f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#8 0x00007f2ce3a6b08b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#9 0x00007f2ce0dabefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#10 0x00007f2ce321489d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7f2cc0f39700 (LWP 5739)):
#0 0x00007f2ce0db03cb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007f2ce3a6b4ff in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2 0x00007f2ce3a5e67f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3 0x00007f2ce3a6b08b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4 0x00007f2ce0dabefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007f2ce321489d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f2c73fff700 (LWP 5878)):
#0 0x00007f2ce0db03cb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007f2ce3a6b4ff in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2 0x00007f2ce3a5e67f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3 0x00007f2ce3a6b08b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4 0x00007f2ce0dabefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007f2ce321489d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f2c79cc9700 (LWP 5879)):
#0 0x00007f2ce0db03cb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007f2ce3a6b4ff in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2 0x00007f2ce3a5e67f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3 0x00007f2ce3a6b08b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4 0x00007f2ce0dabefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007f2ce321489d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f2c7881f700 (LWP 5880)):
#0 0x00007f2ce0db03cb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007f2ce3a6b4ff in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2 0x00007f2ce3a5e67f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3 0x00007f2ce3a6b08b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4 0x00007f2ce0dabefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007f2ce321489d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f2c7ac3d700 (LWP 5881)):
#0 0x00007f2ce0db03cb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007f2ce3a6b4ff in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2 0x00007f2ce3a5e67f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3 0x00007f2ce3a6b08b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4 0x00007f2ce0dabefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007f2ce321489d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f2c73415700 (LWP 5882)):
#0 0x00007f2ce0db03cb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1 0x00007f2ce3a6b4ff in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#2 0x00007f2ce3a5e67f in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#3 0x00007f2ce3a6b08b in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#4 0x00007f2ce0dabefc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5 0x00007f2ce321489d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f2ce5ea27c0 (LWP 5733)):
[KCrash Handler]
#6 0x00007f2ce222d18b in QNetworkCacheMetaData::QNetworkCacheMetaData(QNetworkCacheMetaData const&) () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#7 0x00007f2ce2210554 in ?? () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#8 0x00007f2ce2211d04 in ?? () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#9 0x00007f2ce229d299 in ?? () from /usr/lib/x86_64-linux-gnu/libQtNetwork.so.4
#10 0x00007f2ce3b82ba6 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#11 0x00007f2ce408c104 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#12 0x00007f2ce4090f83 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#13 0x00007f2ce58ba9a6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#14 0x00007f2ce3b695fc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#15 0x00007f2ce3b6d3ca in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#16 0x00007f2ce3b98773 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#17 0x00007f2cdbba5a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#18 0x00007f2cdbba6258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f2cdbba6429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f2ce3b98b9f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#21 0x00007f2ce413121e in ?? () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#22 0x00007f2ce3b683e2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#23 0x00007f2ce3b68637 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#24 0x00007f2ce3b6d6c7 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#25 0x0000000000402bd3 in ?? ()
#26 0x00007f2ce315430d in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#27 0x00000000004030b5 in _start ()

Ok, it appears to have crashed in the Qt Network Metadata Cache that time. I have no idea why that is happening. You could be experiencing this bug - https://bugs.kde.org/show_bug.cgi?id=286307