Here is a backtrace, I hope it is complete enough...: Application: akonadi_davgroupware_resource (akonadi_davgroupware_resource), signal: Segmentation fault Using host libthread_db library "/usr/lib/libthread_db.so.1". [Current thread is 1 (Thread 0x7f53c21d1900 (LWP 13082))] Thread 5 (Thread 0x7f53877fe700 (LWP 13344)): #0 0x00007f53bcadb37d in read () from /usr/lib/libc.so.6 #1 0x00007f53b274ee20 in ?? () from /usr/lib/libglib-2.0.so.0 #2 0x00007f53b270a47e in g_main_context_check () from /usr/lib/libglib-2.0.so.0 #3 0x00007f53b270a954 in ?? () from /usr/lib/libglib-2.0.so.0 #4 0x00007f53b270aacc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0 #5 0x00007f53bd61f10b in QEventDispatcherGlib::processEvents (this=0x7f53780008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425 #6 0x00007f53bd5c893a in QEventLoop::exec (this=this@entry=0x7f53877fdcb0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212 #7 0x00007f53bd3eaae3 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:507 #8 0x00007f53bd3ef748 in QThreadPrivate::start (arg=0x1890520) at thread/qthread_unix.cpp:368 #9 0x00007f53b655c2e7 in start_thread () from /usr/lib/libpthread.so.0 #10 0x00007f53bcae954f in clone () from /usr/lib/libc.so.6 Thread 4 (Thread 0x7f5387fff700 (LWP 13290)): #0 0x00007f53b27501c9 in g_mutex_lock () from /usr/lib/libglib-2.0.so.0 #1 0x00007f53b270a972 in ?? () from /usr/lib/libglib-2.0.so.0 #2 0x00007f53b270aacc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0 #3 0x00007f53bd61f10b in QEventDispatcherGlib::processEvents (this=0x7f53800008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425 #4 0x00007f53bd5c893a in QEventLoop::exec (this=this@entry=0x7f5387ffecb0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212 #5 0x00007f53bd3eaae3 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:507 #6 0x00007f53bd3ef748 in QThreadPrivate::start (arg=0x18846c0) at thread/qthread_unix.cpp:368 #7 0x00007f53b655c2e7 in start_thread () from /usr/lib/libpthread.so.0 #8 0x00007f53bcae954f in clone () from /usr/lib/libc.so.6 Thread 3 (Thread 0x7f538ce61700 (LWP 13283)): #0 0x00007f53bcadb37d in read () from /usr/lib/libc.so.6 #1 0x00007f53b274ee20 in ?? () from /usr/lib/libglib-2.0.so.0 #2 0x00007f53b270a47e in g_main_context_check () from /usr/lib/libglib-2.0.so.0 #3 0x00007f53b270a954 in ?? () from /usr/lib/libglib-2.0.so.0 #4 0x00007f53b270aacc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0 #5 0x00007f53bd61f10b in QEventDispatcherGlib::processEvents (this=0x7f53880008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:425 #6 0x00007f53bd5c893a in QEventLoop::exec (this=this@entry=0x7f538ce60c80, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212 #7 0x00007f53bd3eaae3 in QThread::exec (this=this@entry=0x7f53be8bad60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread.cpp:507 #8 0x00007f53be646835 in QDBusConnectionManager::run (this=0x7f53be8bad60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:170 #9 0x00007f53bd3ef748 in QThreadPrivate::start (arg=0x7f53be8bad60 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:368 #10 0x00007f53b655c2e7 in start_thread () from /usr/lib/libpthread.so.0 #11 0x00007f53bcae954f in clone () from /usr/lib/libc.so.6 Thread 2 (Thread 0x7f5395f36700 (LWP 13193)): #0 0x00007f53bcadf67d in poll () from /usr/lib/libc.so.6 #1 0x00007f53b69828e0 in ?? () from /usr/lib/libxcb.so.1 #2 0x00007f53b6984679 in xcb_wait_for_event () from /usr/lib/libxcb.so.1 #3 0x00007f5397e239f9 in QXcbEventReader::run (this=0x13b2e10) at qxcbconnection.cpp:1345 #4 0x00007f53bd3ef748 in QThreadPrivate::start (arg=0x13b2e10) at thread/qthread_unix.cpp:368 #5 0x00007f53b655c2e7 in start_thread () from /usr/lib/libpthread.so.0 #6 0x00007f53bcae954f in clone () from /usr/lib/libc.so.6 Thread 1 (Thread 0x7f53c21d1900 (LWP 13082)): [KCrash Handler] #6 QHash<QString, QHashDummyValue>::isEmpty (this=this@entry=0x18) at /usr/include/qt/QtCore/qhash.h:267 #7 QHash<QString, QHashDummyValue>::remove (this=this@entry=0x18, akey=...) at /usr/include/qt/QtCore/qhash.h:787 #8 0x00007f53c19b668d in QSet<QString>::remove (value=..., this=0x18) at /usr/include/qt/QtCore/qset.h:94 #9 KDAV::EtagCache::removeEtag (this=0x0, remoteId=...) at /home/jr/src/kdav/src/kdav-17.04.0/src/common/etagcache.cpp:68 #10 0x0000000000450b7e in DavGroupwareResource::onItemChangedFinished (this=0x1884200, job=<optimized out>) at /home/jr/src/kdepim-runtime/src/kdepim-runtime-17.04.0/resources/dav/resource/davgroupwareresource.cpp:1067 #11 0x00007f53bd5f615e in QtPrivate::QSlotObjectBase::call (a=0x7ffd4a41f110, r=0x1884200, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:101 #12 QMetaObject::activate (sender=sender@entry=0x19e0310, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7ffd4a41f110) at kernel/qobject.cpp:3723 #13 0x00007f53bd5f6707 in QMetaObject::activate (sender=sender@entry=0x19e0310, m=m@entry=0x7f53be62d500 <KJob::staticMetaObject>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7ffd4a41f110) at kernel/qobject.cpp:3602 #14 0x00007f53be3d63f2 in KJob::result (this=this@entry=0x19e0310, _t1=<optimized out>, _t1@entry=0x19e0310) at /home/jr/src/kcoreaddons/src/build/src/lib/KF5CoreAddons_autogen/include/moc_kjob.cpp:570 #15 0x00007f53be3d7d61 in KJob::finishJob (this=this@entry=0x19e0310, emitResult=emitResult@entry=true) at /home/jr/src/kcoreaddons/src/kcoreaddons-5.33.0/src/lib/jobs/kjob.cpp:109 #16 0x00007f53be3d9d2a in KJob::emitResult (this=this@entry=0x19e0310) at /home/jr/src/kcoreaddons/src/kcoreaddons-5.33.0/src/lib/jobs/kjob.cpp:293 #17 0x00007f53c19a5ae2 in KDAV::DavItemModifyJob::itemRefreshed (this=0x19e0310, job=<optimized out>) at /home/jr/src/kdav/src/kdav-17.04.0/src/common/davitemmodifyjob.cpp:131 #18 0x00007f53bd5f615e in QtPrivate::QSlotObjectBase::call (a=0x7ffd4a41f2c0, r=0x19e0310, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:101 #19 QMetaObject::activate (sender=sender@entry=0x19a7610, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7ffd4a41f2c0) at kernel/qobject.cpp:3723 #20 0x00007f53bd5f6707 in QMetaObject::activate (sender=sender@entry=0x19a7610, m=m@entry=0x7f53be62d500 <KJob::staticMetaObject>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7ffd4a41f2c0) at kernel/qobject.cpp:3602 #21 0x00007f53be3d63f2 in KJob::result (this=this@entry=0x19a7610, _t1=<optimized out>, _t1@entry=0x19a7610) at /home/jr/src/kcoreaddons/src/build/src/lib/KF5CoreAddons_autogen/include/moc_kjob.cpp:570 #22 0x00007f53be3d7d61 in KJob::finishJob (this=this@entry=0x19a7610, emitResult=emitResult@entry=true) at /home/jr/src/kcoreaddons/src/kcoreaddons-5.33.0/src/lib/jobs/kjob.cpp:109 #23 0x00007f53be3d9d2a in KJob::emitResult (this=this@entry=0x19a7610) at /home/jr/src/kcoreaddons/src/kcoreaddons-5.33.0/src/lib/jobs/kjob.cpp:293 #24 0x00007f53c19a5257 in KDAV::DavItemFetchJob::davJobFinished (this=0x19a7610, job=<optimized out>) at /home/jr/src/kdav/src/kdav-17.04.0/src/common/davitemfetchjob.cpp:87 #25 0x00007f53bd5f615e in QtPrivate::QSlotObjectBase::call (a=0x7ffd4a41f4f0, r=0x19a7610, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:101 #26 QMetaObject::activate (sender=sender@entry=0x19ab700, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7ffd4a41f4f0) at kernel/qobject.cpp:3723 #27 0x00007f53bd5f6707 in QMetaObject::activate (sender=sender@entry=0x19ab700, m=m@entry=0x7f53be62d500 <KJob::staticMetaObject>, local_signal_index=local_signal_index@entry=3, argv=argv@entry=0x7ffd4a41f4f0) at kernel/qobject.cpp:3602 #28 0x00007f53be3d63f2 in KJob::result (this=this@entry=0x19ab700, _t1=<optimized out>, _t1@entry=0x19ab700) at /home/jr/src/kcoreaddons/src/build/src/lib/KF5CoreAddons_autogen/include/moc_kjob.cpp:570 #29 0x00007f53be3d7d61 in KJob::finishJob (this=0x19ab700, emitResult=<optimized out>) at /home/jr/src/kcoreaddons/src/kcoreaddons-5.33.0/src/lib/jobs/kjob.cpp:109 #30 0x00007f53bf10e1d2 in KIO::SimpleJob::slotFinished() () from /usr/lib/libKF5KIOCore.so.5 #31 0x00007f53bf11abd6 in KIO::TransferJob::slotFinished() () from /usr/lib/libKF5KIOCore.so.5 #32 0x00007f53bf11b5b1 in ?? () from /usr/lib/libKF5KIOCore.so.5 #33 0x00007f53bd5f5de9 in QMetaObject::activate (sender=0x18d5d20, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740 #34 0x00007f53bf0e7e01 in KIO::SlaveInterface::dispatch(int, QByteArray const&) () from /usr/lib/libKF5KIOCore.so.5 #35 0x00007f53bf0e6447 in KIO::SlaveInterface::dispatch() () from /usr/lib/libKF5KIOCore.so.5 #36 0x00007f53bf0eb621 in KIO::Slave::gotInput() () from /usr/lib/libKF5KIOCore.so.5 #37 0x00007f53bf189635 in ?? () from /usr/lib/libKF5KIOCore.so.5 #38 0x00007f53bd5f5de9 in QMetaObject::activate (sender=0x18bece0, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3740 #39 0x00007f53bf07eff0 in ?? () from /usr/lib/libKF5KIOCore.so.5 #40 0x00007f53bd5f6c49 in QObject::event (this=0x18bece0, e=<optimized out>) at kernel/qobject.cpp:1263 #41 0x00007f53bf74f3dc in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x18bece0, e=0x190ce70) at kernel/qapplication.cpp:3745 #42 0x00007f53bf756bf1 in QApplication::notify (this=0x7ffd4a4201d0, receiver=0x18bece0, e=0x190ce70) at kernel/qapplication.cpp:3502 #43 0x00007f53bd5ca4e0 in QCoreApplication::notifyInternal2 (receiver=0x18bece0, event=event@entry=0x190ce70) at kernel/qcoreapplication.cpp:988 #44 0x00007f53bd5ccc6d in QCoreApplication::sendEvent (event=0x190ce70, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231 #45 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x1393ee0) at kernel/qcoreapplication.cpp:1648 #46 0x00007f53bd5cd0d8 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1502 #47 0x00007f53bd61ece3 in postEventSourceDispatch (s=0x13d56e0) at kernel/qeventdispatcher_glib.cpp:276 #48 0x00007f53b270a7b7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #49 0x00007f53b270aa20 in ?? () from /usr/lib/libglib-2.0.so.0 #50 0x00007f53b270aacc in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0 #51 0x00007f53bd61f0ef in QEventDispatcherGlib::processEvents (this=0x13deb30, flags=...) at kernel/qeventdispatcher_glib.cpp:423 #52 0x00007f53bd5c893a in QEventLoop::exec (this=this@entry=0x7ffd4a420130, flags=..., flags@entry=...) at kernel/qeventloop.cpp:212 #53 0x00007f53bd5d0e84 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1261 #54 0x00007f53c1c02bbe in Akonadi::ResourceBase::init(Akonadi::ResourceBase*) () from /usr/lib/libKF5AkonadiAgentBase.so.5 #55 0x000000000045ba87 in Akonadi::ResourceBase::init<DavGroupwareResource> (argc=<optimized out>, argv=<optimized out>) at /usr/include/KF5/AkonadiAgentBase/resourcebase.h:196 #56 0x00007f53bca1d511 in __libc_start_main () from /usr/lib/libc.so.6 #57 0x00000000004178aa in _start ()
Looks like a duplicate of Bug 360792
*** This bug has been marked as a duplicate of bug 360792 ***