SUMMARY Crash handler crashed immediately on login. STEPS TO REPRODUCE (didn't yet try to reproduce) 1. Enter login password in SDDM 2. Press ENTER 3. Wait a few moments for crash notification box to appear OBSERVED RESULT Crash notification box appears. When I click on its button I get the crash handler dialog with the text: We are sorry, the KDE Crash Handler closed unexpectedly. As the Crash handler itself has failed, the automatic reporting process is disabled to reduce the risks of failing again. Please, manually report this error to the KDE bug tracking system. Do not forget to include the backtrace from the Developer Information tab. Details: Executable: drkonqi PID: 3237 Signal: Segmentation fault (11) Time: 06.08.19 09:24:57 Application: The KDE Crash Handler (drkonqi), signal: Segmentation fault Using host libthread_db library "/lib64/libthread_db.so.1". [Current thread is 1 (Thread 0x7f14d5d0c780 (LWP 3237))] Thread 3 (Thread 0x7f14d0a44700 (LWP 3241)): #0 0x00007f14dab5c9f6 in g_source_iter_next (iter=iter@entry=0x7f14d0a43c20, source=source@entry=0x7f14d0a43c18) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:983 #1 0x00007f14dab5f39f in g_main_context_check (context=context@entry=0x7f14c4000bf0, max_priority=2147483647, fds=fds@entry=0x7f14c4004db0, n_fds=n_fds@entry=1) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:944 #2 0x00007f14dab5fa30 in g_main_context_iterate (context=context@entry=0x7f14c4000bf0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3917 #3 0x00007f14dab5fbac in g_main_context_iteration (context=0x7f14c4000bf0, may_block=may_block@entry=1) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3981 #4 0x00007f14dd42520b in QEventDispatcherGlib::processEvents (this=0x7f14c4000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424 #5 0x00007f14dd3ccc4b in QEventLoop::exec (this=this@entry=0x7f14d0a43df0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140 #6 0x00007f14dd2272d6 in QThread::exec (this=this@entry=0x7f14de334060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at ../../include/QtCore/../../src/corelib/global/qflags.h:120 #7 0x00007f14de2a3d05 in QDBusConnectionManager::run (this=0x7f14de334060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178 #8 0x00007f14dd228614 in QThreadPrivate::start (arg=0x7f14de334060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:361 #9 0x00007f14dc0c6408 in start_thread (arg=<optimized out>) at pthread_create.c:486 #10 0x00007f14dcc1f73f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 2 (Thread 0x7f14d2eef700 (LWP 3239)): #0 0x00007f14dcc13473 in __GI___poll (fds=0x7f14d2eeed18, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x00007f14da6128f7 in ?? () from /usr/lib64/libxcb.so.1 #2 0x00007f14da614a1a in xcb_wait_for_event () from /usr/lib64/libxcb.so.1 #3 0x00007f14d54c0f68 in QXcbEventQueue::run (this=0x56366d4aabe0) at qxcbeventqueue.cpp:228 #4 0x00007f14dd228614 in QThreadPrivate::start (arg=0x56366d4aabe0) at thread/qthread_unix.cpp:361 #5 0x00007f14dc0c6408 in start_thread (arg=<optimized out>) at pthread_create.c:486 #6 0x00007f14dcc1f73f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Thread 1 (Thread 0x7f14d5d0c780 (LWP 3237)): [KCrash Handler] #7 0x00007f14dd2ba2fd in QString::size (this=0x7ffdebf4cc20) at ../../include/QtCore/../../src/corelib/tools/qstring.h:239 #8 stringList_contains<QString> (cs=cs@entry=Qt::CaseSensitive, str=..., stringList=...) at tools/qstringlist.cpp:319 #9 QtPrivate::QStringList_contains (that=that@entry=0x7f14c4003f98, str=..., cs=cs@entry=Qt::CaseSensitive) at tools/qstringlist.cpp:343 #10 0x00007f14de2ad67a in QStringList::contains (cs=Qt::CaseSensitive, str=..., this=0x7f14c4003f98) at ../../include/QtCore/../../src/corelib/tools/qstringlist.h:225 #11 QDBusConnectionPrivate::isServiceRegisteredByThread (serviceName=..., this=0x7f14c4003f10) at qdbusintegrator.cpp:2593 #12 QDBusConnectionPrivate::isServiceRegisteredByThread (this=0x7f14c4003f10, serviceName=...) at qdbusintegrator.cpp:2585 #13 0x00007f14de2b6c3c in QDBusConnectionPrivate::sendWithReplyAsync (this=0x7f14c4003f10, message=..., receiver=receiver@entry=0x0, returnMethod=returnMethod@entry=0x0, errorMethod=errorMethod@entry=0x0, timeout=-1) at qdbusintegrator.cpp:2098 #14 0x00007f14de2a49f8 in QDBusConnection::asyncCall (this=this@entry=0x56366d5574b0, message=..., timeout=<optimized out>) at qdbusconnection.cpp:710 #15 0x00007f14de2c23f8 in QDBusAbstractInterface::asyncCallWithArgumentList (this=<optimized out>, method=..., args=...) at qdbusabstractinterface.cpp:527 #16 0x00007f14de5e297f in OrgKdeStatusNotifierWatcherInterface::RegisterStatusNotifierItem (service=..., this=0x56366d58acc0) at src/statusnotifierwatcher_interface.h:62 #17 KStatusNotifierItemPrivate::<lambda()>::operator() (__closure=0x56366d59c970, __closure=0x56366d59c970) at /var/tmp/portage/kde-frameworks/knotifications-5.60.0/work/knotifications-5.60.0/src/kstatusnotifieritem.cpp:864 #18 QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, KStatusNotifierItemPrivate::registerToDaemon()::<lambda()> >::call (arg=<optimized out>, f=...) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:146 #19 QtPrivate::Functor<KStatusNotifierItemPrivate::registerToDaemon()::<lambda()>, 0>::call<QtPrivate::List<>, void> (arg=<optimized out>, f=...) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:256 #20 QtPrivate::QFunctorSlotObject<KStatusNotifierItemPrivate::registerToDaemon()::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=<optimized out>, this_=0x56366d59c960, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:439 #21 0x00007f14dd3f970f in QtPrivate::QSlotObjectBase::call (a=0x7ffdebf4ced0, r=0x7f14c4013660, this=0x56366d59c960) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:394 #22 QMetaObject::activate (sender=0x56366d5563f0, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3781 #23 0x00007f14de30e92f in QDBusPendingCallWatcher::finished (this=<optimized out>, _t1=<optimized out>) at .moc/moc_qdbuspendingcall.cpp:158 #24 0x00007f14de30ea3a in QDBusPendingCallWatcher::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at .moc/moc_qdbuspendingcall.cpp:94 #25 0x00007f14dd3fa2ca in QObject::event (this=0x56366d5563f0, e=<optimized out>) at kernel/qobject.cpp:1260 #26 0x00007f14ddd8c4d1 in QApplicationPrivate::notify_helper (this=this@entry=0x56366d48cf50, receiver=receiver@entry=0x56366d5563f0, e=e@entry=0x56366d5abdb0) at kernel/qapplication.cpp:3737 #27 0x00007f14ddd938d8 in QApplication::notify (this=0x7ffdebf4d650, receiver=0x56366d5563f0, e=0x56366d5abdb0) at kernel/qapplication.cpp:3483 #28 0x00007f14dd3ce2f1 in QCoreApplication::notifyInternal2 (receiver=0x56366d5563f0, event=0x56366d5abdb0) at kernel/qcoreapplication.cpp:1084 #29 0x00007f14dd3d1855 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x56366d48d0d0) at kernel/qcoreapplication.cpp:1821 #30 0x00007f14dd4257d3 in postEventSourceDispatch (s=0x56366d502c60) at kernel/qeventdispatcher_glib.cpp:276 #31 0x00007f14dab5f87d in g_main_dispatch (context=0x7f14cc004ff0) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3182 #32 g_main_context_dispatch (context=context@entry=0x7f14cc004ff0) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3847 #33 0x00007f14dab5fb18 in g_main_context_iterate (context=context@entry=0x7f14cc004ff0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3920 #34 0x00007f14dab5fbac in g_main_context_iteration (context=0x7f14cc004ff0, may_block=may_block@entry=1) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3981 #35 0x00007f14dd4251f3 in QEventDispatcherGlib::processEvents (this=0x56366d5037b0, flags=...) at kernel/qeventdispatcher_glib.cpp:422 #36 0x00007f14dd3ccc4b in QEventLoop::exec (this=this@entry=0x7ffdebf4d4b0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140 #37 0x00007f14dd3d5542 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:120 #38 0x000056366d276ce7 in main (argc=<optimized out>, argv=<optimized out>) at /var/tmp/portage/kde-plasma/drkonqi-5.16.4/work/drkonqi-5.16.4/src/main.cpp:196 [Inferior 1 (process 3237) detached] EXPECTED RESULT No crash. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Gentoo Linux (available in About System) KDE Plasma Version: 5.16.4 KDE Frameworks Version: 5.60.0 Qt Version: 5.12.4 DBUS Version: 1.12.16 ADDITIONAL INFORMATION (gdb) thread apply all bt full Thread 3 (Thread 0x7f14d0a44700 (LWP 3241)): #0 0x00007f14dcc13473 in __GI___poll (fds=0x7f14c4004db0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 resultvar = 1 sc_cancel_oldtype = 0 sc_ret = <optimized out> #1 0x00007f14dab5fa86 in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f14c4004db0, timeout=<optimized out>, context=0x7f14c4000bf0) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:4221 ret = <optimized out> errsv = <optimized out> poll_func = 0x7f14dab6f200 <g_poll> poll_func = <optimized out> ret = <optimized out> errsv = <optimized out> #2 g_main_context_iterate (context=context@entry=0x7f14c4000bf0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3915 max_priority = 2147483647 timeout = -1 some_ready = <optimized out> nfds = 1 allocated_nfds = 3 fds = 0x7f14c4004db0 #3 0x00007f14dab5fbac in g_main_context_iteration (context=0x7f14c4000bf0, may_block=may_block@entry=1) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3981 retval = <optimized out> #4 0x00007f14dd42520b in QEventDispatcherGlib::processEvents (this=0x7f14c4000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424 d = 0x7f14c4000b40 canWait = true savedFlags = {i = 0} result = false #5 0x00007f14dd3ccc4b in QEventLoop::exec (this=this@entry=0x7f14d0a43df0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140 d = 0x7f14c4004770 locker = {val = 94791762245648} __PRETTY_FUNCTION__ = "int QEventLoop::exec(QEventLoop::ProcessEventsFlags)" ref = {d = 0x7f14c4004770, locker = @0x7f14d0a43d78, exceptionCaught = true} app = <optimized out> #6 0x00007f14dd2272d6 in QThread::exec (this=this@entry=0x7f14de334060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at ../../include/QtCore/../../src/corelib/global/qflags.h:120 d = 0x56366d50f7a0 locker = {val = 94791762245648} eventLoop = {<QObject> = {_vptr.QObject = 0x7f14dd699a48 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f14dd57dde0 <qt_meta_stringdata_QObject>, data = 0x7f14dd57dcc0 <qt_meta_data_QObject>, static_metacall = 0x7f14dd400ab0 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x7f14c4004770}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f14dd580d00 <qt_meta_stringdata_Qt>, data = 0x7f14dd57df00 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f14dd692000 <QObject::staticMetaObject>, stringdata = 0x7f14dd5763c0 <qt_meta_stringdata_QEventLoop>, data = 0x7f14dd576360 <qt_meta_data_QEventLoop>, static_metacall = 0x7f14dd3cc980 <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}} returnCode = <optimized out> #7 0x00007f14de2a3d05 in QDBusConnectionManager::run (this=0x7f14de334060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178 locker = <optimized out> #8 0x00007f14dd228614 in QThreadPrivate::start (arg=0x7f14de334060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:361 thr = 0x7f14de334060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder> data = <optimized out> __clframe = {__cancel_routine = 0x7f14dd227bd0 <QThreadPrivate::finish(void*)>, __cancel_arg = 0x7f14de334060 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>, __do_it = 1, __cancel_type = <optimized out>} #9 0x00007f14dc0c6408 in start_thread (arg=<optimized out>) at pthread_create.c:486 ret = <optimized out> pd = <optimized out> now = <optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139727376500480, -6162380588642061059, 140728562143550, 140728562143551, 8396800, 140728562143760, 6076326531590403325, 6076318630824785149}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = <optimized out> #10 0x00007f14dcc1f73f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 No locals. Thread 2 (Thread 0x7f14d2eef700 (LWP 3239)): #0 0x00007f14dcc13473 in __GI___poll (fds=0x7f14d2eeed18, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 resultvar = 18446744073709551100 sc_cancel_oldtype = 0 sc_ret = <optimized out> #1 0x00007f14da6128f7 in ?? () from /usr/lib64/libxcb.so.1 No symbol table info available. #2 0x00007f14da614a1a in xcb_wait_for_event () from /usr/lib64/libxcb.so.1 No symbol table info available. #3 0x00007f14d54c0f68 in QXcbEventQueue::run (this=0x56366d4aabe0) at qxcbeventqueue.cpp:228 event = <optimized out> connection = 0x56366d49ec40 tail = 0x7f14d55dbfb0 <QXcbEventQueue::qXcbEventNodeFactory(xcb_generic_event_t*)::qXcbNodePool+144> enqueueEvent = {__tail = <synthetic pointer><error reading variable>, __this = 0x56366d4aabe0} #4 0x00007f14dd228614 in QThreadPrivate::start (arg=0x56366d4aabe0) at thread/qthread_unix.cpp:361 thr = 0x56366d4aabe0 data = <optimized out> __clframe = {__cancel_routine = 0x7f14dd227bd0 <QThreadPrivate::finish(void*)>, __cancel_arg = 0x56366d4aabe0, __do_it = 1, __cancel_type = <optimized out>} #5 0x00007f14dc0c6408 in start_thread (arg=<optimized out>) at pthread_create.c:486 ret = <optimized out> pd = <optimized out> now = <optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139727414949632, -6162380588642061059, 140728562142830, 140728562142831, 8396800, 140728562143040, 6076330463096091901, 6076318630824785149}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = <optimized out> #6 0x00007f14dcc1f73f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 No locals. Thread 1 (Thread 0x7f14d5d0c780 (LWP 3237)): #0 0x00007f14dcc13473 in __GI___poll (fds=fds@entry=0x7ffdebf4c258, nfds=nfds@entry=1, timeout=timeout@entry=1000) at ../sysdeps/unix/sysv/linux/poll.c:29 resultvar = 18446744073709551100 sc_cancel_oldtype = 0 sc_ret = <optimized out> #1 0x00007f14de7ebd84 in poll (__timeout=1000, __nfds=1, __fds=0x7ffdebf4c258) at /usr/include/bits/poll2.h:46 No locals. #2 pollDrKonqiSocket (pid=3254, sockfd=4) at /var/tmp/portage/kde-frameworks/kcrash-5.60.0/work/kcrash-5.60.0/src/kcrash.cpp:909 fd = {fd = 4, events = 1, revents = 0} r = <optimized out> clsockfd = <optimized out> msg = <optimized out> drkonqi_client = {sun_family = 0, sun_path = '\000' <repeats 107 times>} cllength = 110 ucred = {pid = 0, uid = 0, gid = 0} credlen = 12 msize = <optimized out> dpid = <optimized out> #3 0x00007f14de7ec309 in startProcessInternal (argc=argc@entry=21, argv=argv@entry=0x7ffdebf4c3e0, waitAndExit=waitAndExit@entry=true, directly=directly@entry=false) at /usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include/g++-v8/bits/atomic_base.h:303 running = <optimized out> socketpath = {d = 0x56366d5ad6b0} sockfd = 4 pid = 3254 #4 0x00007f14de7ecb9e in KCrash::startProcess (argc=argc@entry=21, argv=argv@entry=0x7ffdebf4c3e0, waitAndExit=waitAndExit@entry=true) at /var/tmp/portage/kde-frameworks/kcrash-5.60.0/work/kcrash-5.60.0/src/kcrash.cpp:637 startDirectly = true #5 0x00007f14de7ed051 in KCrash::defaultCrashHandler (sig=11) at /var/tmp/portage/kde-frameworks/kcrash-5.60.0/work/kcrash-5.60.0/src/kcrash.cpp:535 argv = {0x56366d557200 "/usr/lib64/libexec/drkonqi", 0x7f14de7ef0b1 "-platform", 0x56366d5ad498 "xcb", 0x7f14de7ef153 "-display", 0x56366d49d8a0 ":0", 0x7f14de7ef0bb "--appname", 0x56366d4e6180 "drkonqi", 0x7f14de7ef0cf "--apppath", 0x56366d4fbd10 "/usr/lib64/libexec", 0x7f14de7ef0dc "--signal", 0x7ffdebf4c4d6 "11", 0x7f14de7ef0ea "--pid", 0x7ffdebf4c4e0 "3237", 0x7f14de7ef0f0 "--appversion", 0x56366d513018 "5.16.4", 0x7f14de7ef0fd "--programname", 0x56366d510b38 "The KDE Crash Handler", 0x7f14de7ef10b "--bugaddress", 0x56366d490f38 "submit@bugs.kde.org", 0x7f14de7ef118 "--startupid", 0x56366d5ad698 "0", 0x0, 0x7ffdebf4c460 "8\vQm6V", 0x7f14dea9577c <_dl_map_object_deps+1052> "H\203\275x\373\377\377", 0x1 <error: Cannot access memory at address 0x1>, 0x7f14dba63480 "", 0x7ffdebf4c480 "\230\326Zm6V", 0x7f14dea9577c <_dl_map_object_deps+1052> "H\203\275x\373\377\377", 0x1 <error: Cannot access memory at address 0x1>} i = 21 platformName = {d = 0x56366d5ad480} about = 0x56366d50cd10 sigtxt = "11\000W\251\336\024\177\000" pidtxt = "3237\000\000\000\000\000\320x\326\024\177\000\000\300\304\364", <incomplete sequence \353> startupId = {d = 0x56366d5ad680} crashRecursionCounter = 2 #6 <signal handler called> No locals. #7 0x00007f14dd2ba2fd in QString::size (this=0x7ffdebf4cc20) at ../../include/QtCore/../../src/corelib/tools/qstring.h:239 No locals. #8 stringList_contains<QString> (cs=cs@entry=Qt::CaseSensitive, str=..., stringList=...) at tools/qstringlist.cpp:319 string = <error reading variable> __for_range = <error reading variable> __for_begin = <optimized out> __for_end = <optimized out> #9 QtPrivate::QStringList_contains (that=that@entry=0x7f14c4003f98, str=..., cs=cs@entry=Qt::CaseSensitive) at tools/qstringlist.cpp:343 No locals. #10 0x00007f14de2ad67a in QStringList::contains (cs=Qt::CaseSensitive, str=..., this=0x7f14c4003f98) at ../../include/QtCore/../../src/corelib/tools/qstringlist.h:225 No locals. #11 QDBusConnectionPrivate::isServiceRegisteredByThread (serviceName=..., this=0x7f14c4003f10) at qdbusintegrator.cpp:2593 locker = {<QDBusLockerBase> = {<No data fields>}, self = 0x7f14c4003f10, action = <optimized out>} locker = <optimized out> #12 QDBusConnectionPrivate::isServiceRegisteredByThread (this=0x7f14c4003f10, serviceName=...) at qdbusintegrator.cpp:2585 locker = {<QDBusLockerBase> = {<No data fields>}, self = <optimized out>, action = UnregisterServiceAction} #13 0x00007f14de2b6c3c in QDBusConnectionPrivate::sendWithReplyAsync (this=0x7f14c4003f10, message=..., receiver=receiver@entry=0x0, returnMethod=returnMethod@entry=0x0, errorMethod=errorMethod@entry=0x0, timeout=-1) at qdbusintegrator.cpp:2098 pcall = 0x56366d5b6210 isLoopback = <optimized out> error = {code = 3958689136, msg = {static null = {<No data fields>}, d = 0x7f14dd3e439e <registerNormalizedType(QByteArray const&, QMetaType::Destructor, QMetaType::Constructor, QMetaType::TypedDestructor, QMetaType::TypedConstructor, int, QMetaType::TypeFlags, QMetaObject const*)+1230>}, nm = {static null = {<No data fields>}, d = 0x0}, unused = 0xff2e010a0a08eb00} msg = <optimized out> __PRETTY_FUNCTION__ = "QDBusPendingCallPrivate* QDBusConnectionPrivate::sendWithReplyAsync(const QDBusMessage&, QObject*, const char*, const char*, int)" #14 0x00007f14de2a49f8 in QDBusConnection::asyncCall (this=this@entry=0x56366d5574b0, message=..., timeout=<optimized out>) at qdbusconnection.cpp:710 priv = <optimized out> #15 0x00007f14de2c23f8 in QDBusAbstractInterface::asyncCallWithArgumentList (this=<optimized out>, method=..., args=...) at qdbusabstractinterface.cpp:527 d = 0x56366d557440 msg = {d_ptr = 0x56366d5b6510} #16 0x00007f14de5e297f in OrgKdeStatusNotifierWatcherInterface::RegisterStatusNotifierItem (service=..., this=0x56366d58acc0) at src/statusnotifierwatcher_interface.h:62 argumentList = {<QListSpecialMethods<QVariant>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x56366d5ad3b0}, d = 0x56366d5ad3b0}} argumentList = <optimized out> #17 KStatusNotifierItemPrivate::<lambda()>::operator() (__closure=0x56366d59c970, __closure=0x56366d59c970) at /var/tmp/portage/kde-frameworks/knotifications-5.60.0/work/knotifications-5.60.0/src/kstatusnotifieritem.cpp:864 ok = true protocolVersion = <optimized out> reply = {<QDBusPendingReplyData> = {<QDBusPendingCall> = {d = {d = 0x56366d581220}}, <No data fields>}, <No data fields>} watcher = <optimized out> this = <optimized out> watcher = <optimized out> this = <optimized out> reply = <optimized out> qt_category_enabled = <optimized out> ok = <optimized out> protocolVersion = <optimized out> qt_category_enabled = <optimized out> #18 QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, KStatusNotifierItemPrivate::registerToDaemon()::<lambda()> >::call (arg=<optimized out>, f=...) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:146 No locals. #19 QtPrivate::Functor<KStatusNotifierItemPrivate::registerToDaemon()::<lambda()>, 0>::call<QtPrivate::List<>, void> (arg=<optimized out>, f=...) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:256 No locals. #20 QtPrivate::QFunctorSlotObject<KStatusNotifierItemPrivate::registerToDaemon()::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=<optimized out>, this_=0x56366d59c960, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/qt5/QtCore/qobjectdefs_impl.h:439 No locals. #21 0x00007f14dd3f970f in QtPrivate::QSlotObjectBase::call (a=0x7ffdebf4ced0, r=0x7f14c4013660, this=0x56366d59c960) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:394 No locals. #22 QMetaObject::activate (sender=0x56366d5563f0, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3781 obj = {d = 0x56366d59c960} receiver = 0x7f14c4013660 receiverInSameThread = <optimized out> sw = {receiver = 0x7f14c4013660, previousSender = 0x0, currentSender = {sender = 0x56366d5563f0, signal = 3, ref = 1}, switched = true} c = 0x56366d556870 last = 0x56366d556870 locker = {val = 139727590790240} connectionLists = {connectionLists = 0x56366d59eb70} list = 0x56366d552ee8 currentThreadId = 0x7f14d5d0c780 signal_index = 3 empty_argv = {0x0} __PRETTY_FUNCTION__ = "static void QMetaObject::activate(QObject*, int, int, void**)" #23 0x00007f14de30e92f in QDBusPendingCallWatcher::finished (this=<optimized out>, _t1=<optimized out>) at .moc/moc_qdbuspendingcall.cpp:158 _a = {0x0, 0x7ffdebf4cec8} #24 0x00007f14de30ea3a in QDBusPendingCallWatcher::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at .moc/moc_qdbuspendingcall.cpp:94 _t = <optimized out> result = <optimized out> #25 0x00007f14dd3fa2ca in QObject::event (this=0x56366d5563f0, e=<optimized out>) at kernel/qobject.cpp:1260 mce = <optimized out> sw = {receiver = 0x56366d5563f0, previousSender = 0x0, currentSender = {sender = 0x56366d541810, signal = 3, ref = 1}, switched = true} #26 0x00007f14ddd8c4d1 in QApplicationPrivate::notify_helper (this=this@entry=0x56366d48cf50, receiver=receiver@entry=0x56366d5563f0, e=e@entry=0x56366d5abdb0) at kernel/qapplication.cpp:3737 consumed = false #27 0x00007f14ddd938d8 in QApplication::notify (this=0x7ffdebf4d650, receiver=0x56366d5563f0, e=0x56366d5abdb0) at kernel/qapplication.cpp:3483 w = <optimized out> extra = <optimized out> isProxyWidget = <optimized out> d = <optimized out> res = false me = <optimized out> #28 0x00007f14dd3ce2f1 in QCoreApplication::notifyInternal2 (receiver=0x56366d5563f0, event=0x56366d5abdb0) at kernel/qcoreapplication.cpp:1084 selfRequired = true result = false cbdata = {0x56366d5563f0, 0x56366d5abdb0, 0x7ffdebf4d1bf} d = <optimized out> threadData = 0x56366d48d0d0 scopeLevelCounter = {threadData = 0x56366d48d0d0} #29 0x00007f14dd3d1855 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x56366d48d0d0) at kernel/qcoreapplication.cpp:1821 e = 0x56366d5abdb0 pe = <optimized out> r = <optimized out> unlocker = {m = <synthetic pointer><error reading variable>} event_deleter = {d = 0x56366d5abdb0} __PRETTY_FUNCTION__ = "static void QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*)" locker = {val = 94791761711360} startOffset = 0 i = @0x56366d48d0f4: 8 cleanup = <optimized out> #30 0x00007f14dd4257d3 in postEventSourceDispatch (s=0x56366d502c60) at kernel/qeventdispatcher_glib.cpp:276 source = 0x56366d502c60 #31 0x00007f14dab5f87d in g_main_dispatch (context=0x7f14cc004ff0) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3182 dispatch = 0x7f14dd4257c0 <postEventSourceDispatch(GSource*, GSourceFunc, gpointer)> prev_source = 0x0 was_in_call = 0 user_data = 0x0 callback = 0x0 cb_funcs = <optimized out> cb_data = <optimized out> need_destroy = <optimized out> source = 0x56366d502c60 current = 0x56366d506660 i = 0 current = <optimized out> i = <optimized out> __func__ = "g_main_dispatch" source = <optimized out> _g_boolean_var_ = <optimized out> was_in_call = <optimized out> user_data = <optimized out> callback = <optimized out> cb_funcs = <optimized out> cb_data = <optimized out> need_destroy = <optimized out> dispatch = <optimized out> prev_source = <optimized out> _g_boolean_var_ = <optimized out> #32 g_main_context_dispatch (context=context@entry=0x7f14cc004ff0) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3847 No locals. #33 0x00007f14dab5fb18 in g_main_context_iterate (context=context@entry=0x7f14cc004ff0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3920 max_priority = 0 timeout = 0 some_ready = 1 nfds = <optimized out> allocated_nfds = 7 fds = 0x56366d596ea0 #34 0x00007f14dab5fbac in g_main_context_iteration (context=0x7f14cc004ff0, may_block=may_block@entry=1) at /var/tmp/portage/dev-libs/glib-2.58.3-r1/work/glib-2.58.3/glib/gmain.c:3981 retval = <optimized out> #35 0x00007f14dd4251f3 in QEventDispatcherGlib::processEvents (this=0x56366d5037b0, flags=...) at kernel/qeventdispatcher_glib.cpp:422 d = 0x56366d4e99d0 canWait = true savedFlags = {i = 0} result = <optimized out> #36 0x00007f14dd3ccc4b in QEventLoop::exec (this=this@entry=0x7ffdebf4d4b0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:140 d = 0x56366d553ba0 locker = {val = 94791761711584} __PRETTY_FUNCTION__ = "int QEventLoop::exec(QEventLoop::ProcessEventsFlags)" ref = {d = 0x56366d553ba0, locker = @0x7ffdebf4d438, exceptionCaught = true} app = <optimized out> #37 0x00007f14dd3d5542 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:120 threadData = 0x56366d48d0d0 __PRETTY_FUNCTION__ = "static int QCoreApplication::exec()" eventLoop = {<QObject> = {_vptr.QObject = 0x7f14dd699a48 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f14dd57dde0 <qt_meta_stringdata_QObject>, data = 0x7f14dd57dcc0 <qt_meta_data_QObject>, static_metacall = 0x7f14dd400ab0 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x56366d553ba0}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f14dd580d00 <qt_meta_stringdata_Qt>, data = 0x7f14dd57df00 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f14dd692000 <QObject::staticMetaObject>, stringdata = 0x7f14dd5763c0 <qt_meta_stringdata_QEventLoop>, data = 0x7f14dd576360 <qt_meta_data_QEventLoop>, static_metacall = 0x7f14dd3cc980 <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}} returnCode = <optimized out> #38 0x000056366d276ce7 in main (argc=<optimized out>, argv=<optimized out>) at /var/tmp/portage/kde-plasma/drkonqi-5.16.4/work/drkonqi-5.16.4/src/main.cpp:196 qa = {<QGuiApplication> = {<QCoreApplication> = {<QObject> = {_vptr.QObject = 0x7f14de25af98 <vtable for QApplication+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f14dd57dde0 <qt_meta_stringdata_QObject>, data = 0x7f14dd57dcc0 <qt_meta_data_QObject>, static_metacall = 0x7f14dd400ab0 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x56366d48cf50}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f14dd580d00 <qt_meta_stringdata_Qt>, data = 0x7f14dd57df00 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f14dd692000 <QObject::staticMetaObject>, stringdata = 0x7f14dd5771e0 <qt_meta_stringdata_QCoreApplication>, data = 0x7f14dd5770c0 <qt_meta_data_QCoreApplication>, static_metacall = 0x7f14dd3d00c0 <QCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static self = 0x7ffdebf4d650}, static staticMetaObject = {d = {superdata = 0x7f14dd699be0 <QCoreApplication::staticMetaObject>, stringdata = 0x7f14ddb14e40 <qt_meta_stringdata_QGuiApplication>, data = 0x7f14ddb14bc0 <qt_meta_data_QGuiApplication>, static_metacall = 0x7f14dd7c3ab0 <QGuiApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f14ddc11de0 <QGuiApplication::staticMetaObject>, stringdata = 0x7f14de102b20 <qt_meta_stringdata_QApplication>, data = 0x7f14de1029a0 <qt_meta_data_QApplication>, static_metacall = 0x7f14ddd91040 <QApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}} aboutData = {static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f14de41d160 <qt_meta_stringdata_KAboutData>, data = 0x7f14de41d060 <qt_meta_data_KAboutData>, static_metacall = 0x7f14de3c1370 <KAboutData::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d = 0x56366d514c70} parser = {d = 0x56366d544810} signalOption = {d = {d = 0x56366d543700}} appNameOption = {d = {d = 0x56366d543620}} appPathOption = {d = {d = 0x56366d543410}} appVersionOption = {d = {d = 0x56366d542e20}} bugAddressOption = {d = {d = 0x56366d542d40}} programNameOption = {d = {d = 0x56366d542a20}} pidOption = {d = {d = 0x56366d53f2b0}} startupIdOption = {d = {d = 0x56366d544680}} kdeinitOption = {d = {d = 0x56366d54d300}} saferOption = {d = {d = 0x56366d544380}} restartedOption = {d = {d = 0x56366d54cf30}} keepRunningOption = {d = {d = 0x56366d54ce00}} threadOption = {d = {d = 0x56366d54cbc0}} dialogOption = {d = {d = 0x56366d54cb30}} forceDialog = <optimized out> openDrKonqiDialog = <optimized out> restarted = <optimized out> ret = <optimized out>
I am guessing this isn't reproducible?
(In reply to Harald Sitter from comment #1) > I am guessing this isn't reproducible? Why do you think so? After reporting this, I've seen the crash notification for drkonqi appear after login at least 2-3 times, but I didn't investigate any further as this was not a blocker. Are there any other details you want me to investigate if this happens again?
It's one of the most illusive crashes I've seen. It affects fairly unrelated apps, doesn't always have the same call chain, but most of all I don't actually see how the code could crash there. Also, all other reports have zero worthwhile information beyond the backtrace. So, what I would like you to do is: - install systemd-coredump - make sure it is set up correctly (/proc/sys/kernel/core_pattern should be set to invoke it) - maybe test by using kill -SEGV on a terminal process - disable kcrash by adding KDE_DEBUG=1 to your /etc/environment - restart and trigger the bug coredumpctl will then able to catch a super accurate core and context of the crash. Please post the coredumpctl info of the crash and check if there might be other crashes that happen around the same time. Additionally please check your .xession-errors, journald/syslog for relevant information around the time the crash occurs (coredumpctl will be able to give you the accurate time it crashed). It's a long shot but the crash may be a symptom of something else. The code in question to do with QStringList, while involving pointers, should not really be able to crash, certainly not while the qapplication loop is still running. So, I wouldn't even begin to figure out what is wrong without patching Qt and seeing what happens. From related bugs I could find it looks like this crash appears seemingly randomly and then disappears again and has no discernible pattern beyond the top most stack frame being the QStringList contains.
(In reply to Harald Sitter from comment #3) > - install systemd-coredump I'm not using systemd so I don't think this will be an option. However, I think I could still use the gcore command-line utility to generate a core dump (or attach GDB to the crashed process and use the gcore command). > - restart and trigger the bug ...if it triggers. Because I haven't seen it lately. I also tried logging in and out again (+ killall -u username -9) multiple times, but I couldn't reproduce it. > It's a long shot but the crash may be a symptom of something else. The code > in question to do with QStringList, while involving pointers, should not > really be able to crash, certainly not while the qapplication loop is still > running. So, I wouldn't even begin to figure out what is wrong without > patching Qt and seeing what happens. > From related bugs I could find it looks like this crash appears seemingly > randomly and then disappears again and has no discernible pattern beyond the > top most stack frame being the QStringList contains. I'll make sure to investigate for any other signs such if it reoccurs. Do you have any references to similar bug reports? Do you think it is a drkonqi issue or rather a Qt issue (e.g. perhaps something similar to QTBUG-39285)?
Possibly related: bug #409752 bug #391358 bug #379862 bug #287480 bug #295903 There are maybe 6 bugs entailing qdbus and maybe 4 times that with a slightly different call chain. Some of the related ones I've looked at go back to ABI problems, which is certainly a possibility here as well. I would rather expect all mainstream distros to have a handle on this though. QTBUG-39285 did sound related, but was supposedly fixed in 5.3. If it is still not thread safe we'll see through coredumpctl though. Drkonqi itself wouldn't be able to fetch a reliable backtrace in that scenario because of how SEGV works for posix threads.
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please mark the bug as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!