483582 2024-03-14 17:14:59 +0000 Ark crashed while restarting plasmashell 2024-05-07 19:29:02 +0000 1 1 2 Applications ark general 24.02.0 Arch Linux Linux RESOLVED FIXED drkonqi, qt6 NOR crash --- 1 leadpogrommer elvis.angelaccio nicolas.fella rthomsen6 https://invent.kde.org/frameworks/kjobwidgets/-/commit/6f3496ce99d5cb9e4ce561d0bfc3b703fe9eec24 0 oldest_to_newest 2300909 0 leadpogrommer 2024-03-14 17:14:59 +0000 Application: ark (24.02.0) Qt Version: 6.6.2 Frameworks Version: 6.0.0 Operating System: Linux 6.7.9-zen1-1-zen x86_64 Windowing System: X11 Distribution: "Arch Linux" DrKonqi: 6.0.2 [CoredumpBackend] -- Information about the crash: Ark has crashed when I was restarting plasmashell due to it being unresponsive and eating a lot of CPU. The reporter is unsure if this crash is reproducible. -- Backtrace: Application: Ark (ark), signal: Segmentation fault Content of s_kcrashErrorMessage: std::unique_ptr<char []> = {get() = <optimized out>} Downloading separate debug info for /usr/bin/ark... [New LWP 13779] [New LWP 13780] [New LWP 13781] Downloading separate debug info for /usr/lib/libkerfuffle.so.24... Downloading separate debug info for /usr/lib/libKF6DBusAddons.so.6... Downloading separate debug info for /usr/lib/libKF6Parts.so.6... Downloading separate debug info for /usr/lib/libKF6KIOGui.so.6... Downloading separate debug info for /usr/lib/libKF6WindowSystem.so.6... Downloading separate debug info for /usr/lib/libKF6KIOCore.so.6... Downloading separate debug info for /usr/lib/libKF6Crash.so.6... Downloading separate debug info for /usr/lib/libKF6XmlGui.so.6... Downloading separate debug info for /usr/lib/libKF6ConfigWidgets.so.6... Downloading separate debug info for /usr/lib/libKF6I18n.so.6... 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Downloading separate debug info for /usr/lib/qt6/plugins/kf6/kwindowsystem/KF6WindowSystemX11Plugin.so... Downloading separate debug info for system-supplied DSO at 0x7ffcbd020000... [Thread debugging using libthread_db enabled] Using host libthread_db library "/usr/lib/libthread_db.so.1". Core was generated by `/usr/bin/ark /tmp/M680x0-llvm-M680x0.zip'. Program terminated with signal SIGSEGV, Segmentation fault. #0 __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=11, no_tid=no_tid@entry=0) at pthread_kill.c:44 Downloading source file /usr/src/debug/glibc/glibc/nptl/pthread_kill.c... 44 return INTERNAL_SYSCALL_ERROR_P (ret) ? INTERNAL_SYSCALL_ERRNO (ret) : 0; [Current thread is 1 (Thread 0x72add9a089c0 (LWP 13779))] Cannot QML trace cores :( Downloading source file /usr/src/debug/glibc/glibc/misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S... Downloading source file /usr/src/debug/glibc/glibc/nptl/pthread_create.c... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qthread_unix.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/plugins/platforms/xcb/qxcbeventqueue.cpp... Downloading source file /usr/src/debug/libxcb/libxcb-1.16.1/src/xcb_in.c... Downloading source file /usr/src/debug/libxcb/libxcb-1.16.1/src/xcb_conn.c... Downloading source file /usr/src/debug/glibc/glibc/io/../sysdeps/unix/sysv/linux/poll.c... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/dbus/qdbusconnection.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/global/qflags.h... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventloop.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventdispatcher_glib.cpp... Downloading source file /usr/src/debug/glib2/build/../glib/glib/gmain.c... Downloading source file /usr/src/debug/ark/ark-24.02.0/app/main.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/widgets/kernel/qapplication.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qcoreapplication.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qobject.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/dbus/qdbusintegrator.cpp... Downloading source file /usr/src/debug/qt6-base/build/src/dbus/DBus_autogen/include/moc_qdbusservicewatcher.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/dbus/qdbusservicewatcher.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qobjectdefs_impl.h... Downloading source file /usr/src/debug/kjobwidgets/kjobwidgets-6.0.0/src/kuiserverv2jobtracker.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/tools/qsharedpointer.cpp... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qbasicatomic.h... Downloading source file /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qatomic_cxx11.h... [Current thread is 1 (Thread 0x72add9a089c0 (LWP 13779))] Thread 3 (Thread 0x72add8a006c0 (LWP 13781)): #0 0x000072addf5190bf in __GI___poll (fds=fds@entry=0x72add89ffa88, nfds=nfds@entry=1, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x000072addfd0320b in poll (__timeout=-1, __nfds=1, __fds=0x72add89ffa88) at /usr/include/bits/poll2.h:39 #2 _xcb_conn_wait (c=c@entry=0x5713a01fa1e0, vector=vector@entry=0x0, count=count@entry=0x0, cond=<optimized out>) at /usr/src/debug/libxcb/libxcb-1.16.1/src/xcb_conn.c:510 #3 0x000072addfd04f3d in _xcb_conn_wait (count=0x0, vector=0x0, cond=0x5713a01fa220, c=0x5713a01fa1e0) at /usr/src/debug/libxcb/libxcb-1.16.1/src/xcb_conn.c:476 #4 xcb_wait_for_event (c=0x5713a01fa1e0) at /usr/src/debug/libxcb/libxcb-1.16.1/src/xcb_in.c:703 #5 0x000072add99b4f4e in QXcbEventQueue::run (this=0x5713a01ef3d0) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/plugins/platforms/xcb/qxcbeventqueue.cpp:192 #6 0x000072adde8a0bd3 in operator() (__closure=<optimized out>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qthread_unix.cpp:324 #7 (anonymous namespace)::terminate_on_exception<QThreadPrivate::start(void*)::<lambda()> > (t=<optimized out>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qthread_unix.cpp:260 #8 QThreadPrivate::start (arg=0x5713a01ef3d0) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qthread_unix.cpp:283 #9 0x000072addf4a955a in start_thread (arg=<optimized out>) at pthread_create.c:447 #10 0x000072addf526a3c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78 Thread 2 (Thread 0x72add94006c0 (LWP 13780)): #0 0x000072addf5190bf in __GI___poll (fds=0x5713a01f6e40, nfds=3, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 #1 0x000072addd8652f6 in g_main_context_poll_unlocked (priority=2147483647, n_fds=3, fds=0x5713a01f6e40, timeout=<optimized out>, context=0x72add4000c80) at ../glib/glib/gmain.c:4653 #2 g_main_context_iterate_unlocked.isra.0 (context=context@entry=0x72add4000c80, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/glib/gmain.c:4344 #3 0x000072addd805162 in g_main_context_iteration (context=0x72add4000c80, may_block=1) at ../glib/glib/gmain.c:4414 #4 0x000072adde9739c4 in QEventDispatcherGlib::processEvents (this=0x72add4000b70, flags=...) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventdispatcher_glib.cpp:393 #5 0x000072adde743d6e in QEventLoop::processEvents (flags=..., this=0x72add93ffb30) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventloop.cpp:100 #6 QEventLoop::exec (this=0x72add93ffb30, flags=...) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventloop.cpp:182 #7 0x000072adde82106f in QThread::exec (this=this@entry=0x72adde0ddb80 <_ZZN13QGlobalStaticIN14QtGlobalStatic6HolderIN12_GLOBAL__N_116Q_QGS__q_managerEEEE8instanceEvE6holder.lto_priv.0>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/global/qflags.h:74 #8 0x000072adde0559df in QDBusConnectionManager::run (this=0x72adde0ddb80 <_ZZN13QGlobalStaticIN14QtGlobalStatic6HolderIN12_GLOBAL__N_116Q_QGS__q_managerEEEE8instanceEvE6holder.lto_priv.0>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/dbus/qdbusconnection.cpp:131 #9 0x000072adde8a0bd3 in operator() (__closure=<optimized out>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qthread_unix.cpp:324 #10 (anonymous namespace)::terminate_on_exception<QThreadPrivate::start(void*)::<lambda()> > (t=<optimized out>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qthread_unix.cpp:260 #11 QThreadPrivate::start (arg=0x72adde0ddb80 <_ZZN13QGlobalStaticIN14QtGlobalStatic6HolderIN12_GLOBAL__N_116Q_QGS__q_managerEEEE8instanceEvE6holder.lto_priv.0>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qthread_unix.cpp:283 #12 0x000072addf4a955a in start_thread (arg=<optimized out>) at pthread_create.c:447 #13 0x000072addf526a3c in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78 Thread 1 (Thread 0x72add9a089c0 (LWP 13779)): [KCrash Handler] #5 std::__atomic_base<int>::fetch_add (__m=std::memory_order_acq_rel, __i=1, this=0x2, this=<optimized out>, __i=<optimized out>, __m=<optimized out>) at /usr/include/c++/13.2.1/bits/atomic_base.h:633 #6 QAtomicOps<int>::ref<int> (_q_value=<error reading variable: Cannot access memory at address 0x2>, _q_value=<optimized out>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qatomic_cxx11.h:258 #7 QBasicAtomicInteger<int>::ref (this=0x2, this=<optimized out>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/thread/qbasicatomic.h:49 #8 QtSharedPointer::ExternalRefCountData::getAndRef (obj=obj@entry=0x5713a0e89c70) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/tools/qsharedpointer.cpp:1409 #9 0x000072addcbed0a9 in QWeakPointer<QObject>::QWeakPointer<KJob, true> (ptr=0x5713a0e89c70, this=<synthetic pointer>, this=<optimized out>, ptr=<optimized out>) at /usr/include/qt6/QtCore/qsharedpointer_impl.h:685 #10 QPointer<KJob>::QPointer (p=0x5713a0e89c70, this=<synthetic pointer>, this=<optimized out>, p=<optimized out>) at /usr/include/qt6/QtCore/qpointer.h:33 #11 operator() (__closure=0x5713a0ce4ac0) at /usr/src/debug/kjobwidgets/kjobwidgets-6.0.0/src/kuiserverv2jobtracker.cpp:204 #12 0x000072adde790ca9 in QtPrivate::QSlotObjectBase::call (a=0x7ffcbd0136c8, r=0x72add4005320, this=0x5713a0ce4ab0, this=<optimized out>, r=<optimized out>, a=<optimized out>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qobjectdefs_impl.h:433 #13 doActivate<false> (sender=0x72addcbffd40 <QGlobalStatic<QtGlobalStatic::Holder<(anonymous namespace)::Q_QGS_serverProxy> >::instance()::holder>, signal_index=3, argv=0x7ffcbd0136c8) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qobject.cpp:4039 #14 0x000072adde790ca9 in QtPrivate::QSlotObjectBase::call (a=0x7ffcbd013860, r=0x72addcbffd40 <QGlobalStatic<QtGlobalStatic::Holder<(anonymous namespace)::Q_QGS_serverProxy> >::instance()::holder>, this=0x5713a0d85ac0, this=<optimized out>, r=<optimized out>, a=<optimized out>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qobjectdefs_impl.h:433 #15 doActivate<false> (sender=0x5713a0e18980, signal_index=5, argv=0x7ffcbd013860) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qobject.cpp:4039 #16 0x000072adde0a1a76 in QDBusServiceWatcher::serviceOwnerChanged (_t3=..., _t2=<optimized out>, _t1=<optimized out>, this=0x5713a0e18980) at /usr/src/debug/qt6-base/build/src/dbus/DBus_autogen/include/moc_qdbusservicewatcher.cpp:318 #17 QDBusServiceWatcherPrivate::_q_serviceOwnerChanged (this=<optimized out>, newOwner=..., oldOwner=<optimized out>, service=<optimized out>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/dbus/qdbusservicewatcher.cpp:53 #18 QDBusServiceWatcher::qt_static_metacall (_o=_o@entry=0x5713a0e18980, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=3, _a=_a@entry=0x7ffcbd013a18) at /usr/src/debug/qt6-base/build/src/dbus/DBus_autogen/include/moc_qdbusservicewatcher.cpp:209 #19 0x000072adde0a1c40 in QDBusServiceWatcher::qt_metacall (this=0x5713a0e18980, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0x7ffcbd013a18) at /usr/src/debug/qt6-base/build/src/dbus/DBus_autogen/include/moc_qdbusservicewatcher.cpp:285 #20 0x000072adde0650ce in QDBusConnectionPrivate::deliverCall (this=0x72add40016a0, object=0x5713a0e18980, msg=..., metaTypes=<optimized out>, slotIdx=8) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/dbus/qdbusintegrator.cpp:977 #21 0x000072adde77c2c7 in QObject::event (this=0x5713a0e18980, e=0x72add4011720) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qobject.cpp:1437 #22 0x000072addf6f438b in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x5713a0e18980, e=0x72add4011720) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/widgets/kernel/qapplication.cpp:3296 #23 0x000072adde739818 in QCoreApplication::notifyInternal2 (receiver=0x5713a0e18980, event=event@entry=0x72add4011720) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qcoreapplication.cpp:1121 #24 0x000072adde739b9b in QCoreApplication::sendEvent (event=0x72add4011720, receiver=<optimized out>) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qcoreapplication.cpp:1539 #25 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x5713a01e04c0) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qcoreapplication.cpp:1901 #26 0x000072adde9758a4 in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qcoreapplication.cpp:1760 #27 postEventSourceDispatch (s=0x5713a0279380) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventdispatcher_glib.cpp:243 #28 0x000072addd806f69 in g_main_dispatch (context=0x72add4000ef0) at ../glib/glib/gmain.c:3476 #29 0x000072addd8653a7 in g_main_context_dispatch_unlocked (context=0x72add4000ef0) at ../glib/glib/gmain.c:4284 #30 g_main_context_iterate_unlocked.isra.0 (context=context@entry=0x72add4000ef0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/glib/gmain.c:4349 #31 0x000072addd805162 in g_main_context_iteration (context=0x72add4000ef0, may_block=1) at ../glib/glib/gmain.c:4414 #32 0x000072adde9739c4 in QEventDispatcherGlib::processEvents (this=0x5713a0287590, flags=...) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventdispatcher_glib.cpp:393 #33 0x000072adde743d6e in QEventLoop::processEvents (flags=..., this=0x7ffcbd014060) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventloop.cpp:100 #34 QEventLoop::exec (this=0x7ffcbd014060, flags=...) at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/kernel/qeventloop.cpp:182 #35 0x000072adde73c2b8 in QCoreApplication::exec () at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/corelib/global/qflags.h:74 #36 0x000072addf6f0f0a in QApplication::exec () at /usr/src/debug/qt6-base/qtbase-everywhere-src-6.6.2/src/widgets/kernel/qapplication.cpp:2574 #37 0x00005713a0005281 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/ark/ark-24.02.0/app/main.cpp:290 Reported using DrKonqi 2303518 1 nicolas.fella 2024-03-20 19:33:00 +0000 This looks like a slightly different variant of https://bugs.kde.org/show_bug.cgi?id=471531 https://invent.kde.org/frameworks/kjobwidgets/-/merge_requests/46 was supposed to fix that, but I don't think the fix makes sense 2309416 2 bug-janitor 2024-04-08 16:59:19 +0000 A possibly relevant merge request was started @ https://invent.kde.org/frameworks/kjobwidgets/-/merge_requests/53 2318170 3 christoph 2024-05-07 19:29:02 +0000 Git commit 6f3496ce99d5cb9e4ce561d0bfc3b703fe9eec24 by Christoph Cullmann, on behalf of Méven Car. Committed on 07/05/2024 at 19:28. Pushed by cullmann into branch 'master'. KUiServerV2JobTracker: prevent a crash Related: bug 471531 This is a very-common crash, happening when plasma crashes itself: https://crash-reports.kde.org/organizations/kde/issues/10390/activity/?project=4&query=is%3Aunresolved&referrer=issue-stream&stream_index=0 I think this is due to the line 204 indeed, dereferencing a jobViews key, which is nullptr, because the `QTimer::timeout` callback in `KUiServerV2JobTracker::registerJob` did implicitely insert a jobViews[nullptr] when the job was already removed. Guard with jobGuard. The first change is not necessary but I felt it makes the code implicit, otherwise we have a QPointer implicit conversion to `*`. cc @broulik M +5 -6 src/kuiserverv2jobtracker.cpp https://invent.kde.org/frameworks/kjobwidgets/-/commit/6f3496ce99d5cb9e4ce561d0bfc3b703fe9eec24