Inspected applications hang up on various occasions (qt.qpa.events.reader: [heap]) #700
Comments
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can you try attaching gdb to the target application to see where its stuck? |
Maybe a flame graph would be more informative? I've seen some, however never tried collecting one myself yet. I mean, sometimes it stuck without CPU throttling — just not processing incoming events. But other times it is CPU-bound which probably means a lot of calls in different places — which in turn means you never know when exactly an attach would happen. |
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Hi, I tried reproducing this today using the |
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Hi, sorry, i'm slow on responses and still bad at debugging stuff. I just launched GammaRay against plasmashell session, switched between two on the Quick Scenes, and it hanged on third. I'm on current master (02190e4). full traceback of plasmashell process❯ gdb --pid=5585
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Attaching to process 5585
[New LWP 5587]
[New LWP 5588]
[New LWP 5652]
[New LWP 5889]
[New LWP 6261]
[New LWP 6313]
[New LWP 6321]
[New LWP 6338]
[New LWP 6400]
[New LWP 6415]
[New LWP 6416]
[New LWP 6417]
[New LWP 6418]
[New LWP 6818]
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[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
0x00007f5f2d5be23f in std::_Hashtable, std::allocator >, std::__detail::_Select1st, std::equal_to, std::hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::find(QSGNode* const&) const () from /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
(gdb) info threads
Id Target Id Frame
* 1 Thread 0x7f5f5c3d1b00 (LWP 5585) "plasmashell" 0x00007f5f2d5be23f in std::_Hashtable, std::allocator >, std::__detail::_Select1st, std::equal_to, std::hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::find(QSGNode* const&) const () from /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
2 Thread 0x7f5f59aa56c0 (LWP 5587) "QDBusConnection" 0x00007f5f5e3140bf in __GI___poll (fds=0x7f5f540053e0, nfds=3, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
3 Thread 0x7f5f592a46c0 (LWP 5588) "QXcbEventQueue" 0x00007f5f5e3140bf in __GI___poll (fds=fds@entry=0x7f5f592a3988, nfds=nfds@entry=1, timeout=timeout@entry=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
4 Thread 0x7f5f4bfff6c0 (LWP 5652) "QQmlThread" 0x00007f5f5e3140bf in __GI___poll (fds=0x7f5f440025e0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
5 Thread 0x7f5f39bba6c0 (LWP 5889) "plasmashell" pselect64_syscall (sigmask=, timeout=, exceptfds=0x0, writefds=0x0, readfds=0x7f5f39bb1990, nfds=30) at ../sysdeps/unix/sysv/linux/pselect.c:34
6 Thread 0x7f5f2ffff6c0 (LWP 6261) "QSGRenderThread" __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x5650511727b4) at futex-internal.c:57
7 Thread 0x7f5f13fff6c0 (LWP 6313) "CPMMListener" 0x00007f5f5e3140bf in __GI___poll (fds=0x7f5f13ffeab8, nfds=1, timeout=300000) at ../sysdeps/unix/sysv/linux/poll.c:29
8 Thread 0x7f5f137fe6c0 (LWP 6321) "QSGRenderThread" __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x565050ac5420) at futex-internal.c:57
9 Thread 0x7f5f07fff6c0 (LWP 6338) "QQuickPixmapRea" 0x00007f5f5e3140bf in __GI___poll (fds=0x7f5efc005730, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
10 Thread 0x7f5f067fc6c0 (LWP 6400) "KCupsConnection" 0x00007f5f5e3140bf in __GI___poll (fds=0x7f5ed40029e0, nfds=1, timeout=3499373) at ../sysdeps/unix/sysv/linux/poll.c:29
11 Thread 0x7f5ef34526c0 (LWP 6415) "QSGRenderThread" __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x7f5f4c00c004) at futex-internal.c:57
12 Thread 0x7f5ef18596c0 (LWP 6416) "QSGRenderThread" __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x5650562a99c0) at futex-internal.c:57
13 Thread 0x7f5ef0e586c0 (LWP 6417) "QSGRenderThread" __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x56505660b554) at futex-internal.c:57
14 Thread 0x7f5eeb3fe6c0 (LWP 6418) "QSGRenderThread" __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x565056701ed4) at futex-internal.c:57
15 Thread 0x7f5ee29ff6c0 (LWP 6818) "QSGRenderThread" __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x565055da7e64) at futex-internal.c:57
(gdb) info stack
#0 0x00007f5f2d5be23f in std::_Hashtable, std::allocator >, std::__detail::_Select1st, std::equal_to, std::hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::find(QSGNode* const&) const () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#1 0x00007f5f2d5bbd5b in GammaRay::QuickSceneGraphModel::itemForSgNode(QSGNode*) const () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#2 0x00007f5f2d5981c3 in GammaRay::QuickInspector::itemSelectionChanged(QItemSelection const&) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#3 0x00007f5f5eabd3df in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffdd8d81340, r=, this=0x5650578152b0, this=, r=, a=) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#4 doActivate(QObject*, int, void**) (sender=0x5650515755a0, signal_index=3, argv=0x7ffdd8d81340) at kernel/qobject.cpp:3919
#5 0x00007f5f5ea5154c in QItemSelectionModel::selectionChanged(QItemSelection const&, QItemSelection const&) (this=, _t1=, _t2=) at .moc/moc_qitemselectionmodel.cpp:475
#6 0x00007f5f5ea56d6f in QItemSelectionModel::select(QItemSelection const&, QFlags) (this=0x5650515755a0, selection=, command=...) at itemmodels/qitemselectionmodel.cpp:1340
#7 0x00007f5f2e38d15f in GammaRay::NetworkSelectionModel::select(QItemSelection const&, QFlags) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/../../../libgammaray_core-qt5_15-x86_64.so.3.0.0
#8 0x00007f5f5ea53880 in QItemSelectionModel::select(QModelIndex const&, QFlags) (this=0x5650515755a0, index=, command=...) at itemmodels/qitemselectionmodel.cpp:1190
#9 0x00007f5f2d598743 in GammaRay::QuickInspector::selectItem(QQuickItem*) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#10 0x00007f5f2d598c08 in GammaRay::QuickInspector::selectWindow(QQuickWindow*) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#11 0x00007f5f2d598ef8 in GammaRay::QuickInspector::selectWindow(int) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#12 0x00007f5f5ea9c56e in QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const (this=, object=0x565056217e20, connectionType=Qt::DirectConnection, returnValue=..., val0=..., val1=..., val2=..., val3=..., val4=..., val5=..., val6=..., val7=..., val8=..., val9=...) at kernel/qmetaobject.cpp:2310
#13 0x00007f5f5ea9cf60 in QMetaObject::invokeMethod(QObject*, char const*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) (obj=0x565056217e20, member=0x565053501148 "selectWindow", type=Qt::AutoConnection, ret=..., val0=..., val1=..., val2=..., val3=..., val4=..., val5=..., val6=..., val7=..., val8=..., val9=...) at kernel/qmetaobject.cpp:1522
#14 0x00007f5f2e245693 in GammaRay::Endpoint::invokeObjectLocal(QObject*, char const*, QList const&) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/../../../libgammaray_common-qt5_15-x86_64.so.3.0.0
#15 0x00007f5f2e245c95 in GammaRay::Endpoint::dispatchMessage(GammaRay::Message const&) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/../../../libgammaray_common-qt5_15-x86_64.so.3.0.0
#16 0x00007f5f2e242010 in GammaRay::Endpoint::readyRead() () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/../../../libgammaray_common-qt5_15-x86_64.so.3.0.0
#17 0x00007f5f5eabd3df in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffdd8d82080, r=, this=0x7f5ecc16d1b0, this=, r=, a=) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#18 doActivate(QObject*, int, void**) (sender=0x7f5f28631f80, signal_index=3, argv=0x7ffdd8d82080) at kernel/qobject.cpp:3919
#19 0x00007f5f5f5b7ee0 in QAbstractSocketPrivate::emitReadyRead(int) (channel=0, this=0x5650549abf00) at socket/qabstractsocket.cpp:1323
#20 QAbstractSocketPrivate::canReadNotification() (this=0x5650549abf00) at socket/qabstractsocket.cpp:748
#21 0x00007f5f5f5ce76a in QAbstractSocketEngine::readNotification() (this=) at socket/qabstractsocketengine.cpp:160
#22 QReadNotifier::event(QEvent*) (this=, e=) at socket/qnativesocketengine.cpp:1274
#23 0x00007f5f5f978b1c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=, receiver=0x56505795dfe0, e=0x7ffdd8d82190) at kernel/qapplication.cpp:3637
#24 0x00007f5f5ea8cf98 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x56505795dfe0, event=0x7ffdd8d82190) at kernel/qcoreapplication.cpp:1064
#25 0x00007f5f5ead6aa6 in socketNotifierSourceDispatch(GSource*, GSourceFunc, gpointer) (source=0x56504ecb7b10) at kernel/qeventdispatcher_glib.cpp:107
#26 0x00007f5f5cd1687b in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#27 0x00007f5f5cd6d299 in () at /usr/lib/libglib-2.0.so.0
#28 0x00007f5f5cd15132 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#29 0x00007f5f5ead7c4c in QEventDispatcherGlib::processEvents(QFlags) (this=0x56504ecb29a0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#30 0x00007f5f5ea8573c in QEventLoop::exec(QFlags) (this=0x7ffdd8d82410, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#31 0x00007f5f5ea90269 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#32 0x000056504d36cc5d in main(int, char**) (argc=2, argv=0x7ffdd8d826d8) at /home/ratijas/kde/src/kde/workspace/plasma-workspace/shell/main.cpp:255
(gdb) bt full
#0 0x00007f5f2d5be23f in std::_Hashtable, std::allocator >, std::__detail::_Select1st, std::equal_to, std::hash, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits >::find(QSGNode* const&) const () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#1 0x00007f5f2d5bbd5b in GammaRay::QuickSceneGraphModel::itemForSgNode(QSGNode*) const () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#2 0x00007f5f2d5981c3 in GammaRay::QuickInspector::itemSelectionChanged(QItemSelection const&) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#3 0x00007f5f5eabd3df in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffdd8d81340, r=, this=0x5650578152b0, this=, r=, a=) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
receiver =
td =
receiverInSameThread =
senderData = {previous = 0x0, receiver = 0x565056217e20, sender = 0x5650515755a0, signal = 3}
c = 0x5650578152e0
connections = {d = 0x565051575f10}
list =
inSenderThread = true
highestConnectionId = 3
signalVector = 0x565057814ca0
currentThreadId = 0x7f5f5c3d1b00
sp =
signal_spy_set = 0x7f5f2e3e7940
empty_argv = {0x0}
senderDeleted = false
#4 doActivate(QObject*, int, void**) (sender=0x5650515755a0, signal_index=3, argv=0x7ffdd8d81340) at kernel/qobject.cpp:3919
receiver =
td =
receiverInSameThread =
senderData = {previous = 0x0, receiver = 0x565056217e20, sender = 0x5650515755a0, signal = 3}
c = 0x5650578152e0
connections = {d = 0x565051575f10}
list =
inSenderThread = true
highestConnectionId = 3
signalVector = 0x565057814ca0
currentThreadId = 0x7f5f5c3d1b00
sp =
signal_spy_set = 0x7f5f2e3e7940
empty_argv = {0x0}
senderDeleted = false
#5 0x00007f5f5ea5154c in QItemSelectionModel::selectionChanged(QItemSelection const&, QItemSelection const&) (this=, _t1=, _t2=) at .moc/moc_qitemselectionmodel.cpp:475
_a = {0x0, 0x7ffdd8d813e8, 0x7ffdd8d813d0}
#6 0x00007f5f5ea56d6f in QItemSelectionModel::select(QItemSelection const&, QFlags) (this=0x5650515755a0, selection=, command=...) at itemmodels/qitemselectionmodel.cpp:1340
d = 0x565051575b40
sel = {> = {> = {}, {p = {static shared_null = {ref = {atomic = {_q_value = std::atomic = { -1 }}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x56505865d400}, d = 0x56505865d400}}, }
old = {> = {> = {}, {p = {static shared_null = {ref = {atomic = {_q_value = std::atomic = { -1 }}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x565053546080}, d = 0x565053546080}}, }
newSelection = {> = {> = {}, {p = {static shared_null = {ref = {atomic = {_q_value = std::atomic = { -1 }}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x56505a88d540}, d = 0x56505a88d540}}, }
#7 0x00007f5f2e38d15f in GammaRay::NetworkSelectionModel::select(QItemSelection const&, QFlags) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/../../../libgammaray_core-qt5_15-x86_64.so.3.0.0
#8 0x00007f5f5ea53880 in QItemSelectionModel::select(QModelIndex const&, QFlags) (this=0x5650515755a0, index=, command=...) at itemmodels/qitemselectionmodel.cpp:1190
selection = {> = {> = {}, {p = {static shared_null = {ref = {atomic = {_q_value = std::atomic = { -1 }}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x56505b187500}, d = 0x56505b187500}}, }
#9 0x00007f5f2d598743 in GammaRay::QuickInspector::selectItem(QQuickItem*) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#10 0x00007f5f2d598c08 in GammaRay::QuickInspector::selectWindow(QQuickWindow*) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#11 0x00007f5f2d598ef8 in GammaRay::QuickInspector::selectWindow(int) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/gammaray_quickinspector.so
#12 0x00007f5f5ea9c56e in QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const (this=, object=0x565056217e20, connectionType=Qt::DirectConnection, returnValue=..., val0=..., val1=..., val2=..., val3=..., val4=..., val5=..., val6=..., val7=..., val8=..., val9=...) at kernel/qmetaobject.cpp:2310
typeNames = {0x1 , 0x56505974df08 "int", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}
paramCount =
currentThreadId =
objectThread =
receiverInSameThread =
param = {0x0, 0x56505bdf5160, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}
idx_relative = 1
idx_offset = 17
callFunction = 0x7f5f2d58ba40
#13 0x00007f5f5ea9cf60 in QMetaObject::invokeMethod(QObject*, char const*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) (obj=0x565056217e20, member=0x565053501148 "selectWindow", type=Qt::AutoConnection, ret=..., val0=..., val1=..., val2=..., val3=..., val4=..., val5=..., val6=..., val7=..., val8=..., val9=...) at kernel/qmetaobject.cpp:1522
sig = {a = 512, s = 18, ptr = 0x7ffdd8d81ac0 "selectWindow(int)", {array = "selectWindow(int)\000\000\000\000\000\000\000T\035\330\330\375\177\000\000H\035\330\330\375\177", '\000' , "\001\000\000\000\000\000\000\000\067\000\000\000_\177\000\000\004\000\000\000\000\000\000\000\220\311\330\330\375\177\000\000\240y\313NPV\000\000\n\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\000bDTPV\000\000\275f.^_\177\000\000\260\033\330\330\375\177\000\000\212\r\255^_\177\000\000\000\000\000\000\000\000\000\000"..., q_for_alignment_1 = 7590663667208447347, q_for_alignment_2 = 2.8052136868211761e+199}}
len =
typeNames = {0x7ffdd8d81c60 "\020\035\330\330\375\177", 0x56505974df08 "int", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}
paramCount =
meta = 0x7f5f2d6001a0
idx =
method = {mobj = 0x7f5f2d6001a0 , handle = 19}
#14 0x00007f5f2e245693 in GammaRay::Endpoint::invokeObjectLocal(QObject*, char const*, QList const&) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/../../../libgammaray_common-qt5_15-x86_64.so.3.0.0
#15 0x00007f5f2e245c95 in GammaRay::Endpoint::dispatchMessage(GammaRay::Message const&) () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/../../../libgammaray_common-qt5_15-x86_64.so.3.0.0
#16 0x00007f5f2e242010 in GammaRay::Endpoint::readyRead() () at /usr/local/kde/lib/gammaray/3.0/qt5_15-x86_64/../../../libgammaray_common-qt5_15-x86_64.so.3.0.0
#17 0x00007f5f5eabd3df in QtPrivate::QSlotObjectBase::call(QObject*, void**) (a=0x7ffdd8d82080, r=, this=0x7f5ecc16d1b0, this=, r=, a=) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
receiver =
td =
receiverInSameThread =
senderData = {previous = 0x0, receiver = 0x56505557ef70, sender = 0x7f5f28631f80, signal = 3}
c = 0x5650534ba1a0
connections = {d = 0x565058982f00}
list =
inSenderThread = true
highestConnectionId = 4
signalVector = 0x5650545a9640
currentThreadId = 0x7f5f5c3d1b00
sp =
signal_spy_set = 0x7f5f2e3e7940
empty_argv = {0x0}
senderDeleted = false
#18 doActivate(QObject*, int, void**) (sender=0x7f5f28631f80, signal_index=3, argv=0x7ffdd8d82080) at kernel/qobject.cpp:3919
receiver =
td =
receiverInSameThread =
senderData = {previous = 0x0, receiver = 0x56505557ef70, sender = 0x7f5f28631f80, signal = 3}
c = 0x5650534ba1a0
connections = {d = 0x565058982f00}
list =
inSenderThread = true
highestConnectionId = 4
signalVector = 0x5650545a9640
currentThreadId = 0x7f5f5c3d1b00
sp =
signal_spy_set = 0x7f5f2e3e7940
empty_argv = {0x0}
senderDeleted = false
#19 0x00007f5f5f5b7ee0 in QAbstractSocketPrivate::emitReadyRead(int) (channel=0, this=0x5650549abf00) at socket/qabstractsocket.cpp:1323
q =
q =
#20 QAbstractSocketPrivate::canReadNotification() (this=0x5650549abf00) at socket/qabstractsocket.cpp:748
q =
#21 0x00007f5f5f5ce76a in QAbstractSocketEngine::readNotification() (this=) at socket/qabstractsocketengine.cpp:160
receiver =
#22 QReadNotifier::event(QEvent*) (this=, e=) at socket/qnativesocketengine.cpp:1274
#23 0x00007f5f5f978b1c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=, receiver=0x56505795dfe0, e=0x7ffdd8d82190) at kernel/qapplication.cpp:3637
consumed = false
filtered = false
#24 0x00007f5f5ea8cf98 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x56505795dfe0, event=0x7ffdd8d82190) at kernel/qcoreapplication.cpp:1064
selfRequired = true
result = false
cbdata = {0x56505795dfe0, 0x7ffdd8d82190, 0x7ffdd8d8213f}
d =
threadData = 0x56504eb80800
scopeLevelCounter = {threadData = 0x56504eb80800}
#25 0x00007f5f5ead6aa6 in socketNotifierSourceDispatch(GSource*, GSourceFunc, gpointer) (source=0x56504ecb7b10) at kernel/qeventdispatcher_glib.cpp:107
p =
i = 10
event = {_vptr.QEvent = 0x7f5f5ed13490 , static staticMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f5f5eb69080 <_ZL25qt_meta_stringdata_QEvent.lto_priv.0>, data = 0x7f5f5eb68ac0 <_ZL19qt_meta_data_QEvent.lto_priv.0>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}, d = 0x0, t = 50, posted = 0, spont = 0, m_accept = 1, reserved = 3029}
#26 0x00007f5f5cd1687b in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#27 0x00007f5f5cd6d299 in () at /usr/lib/libglib-2.0.so.0
#28 0x00007f5f5cd15132 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#29 0x00007f5f5ead7c4c in QEventDispatcherGlib::processEvents(QFlags) (this=0x56504ecb29a0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
d = 0x56504ecb22e0
canWait = true
savedFlags = {i = 0}
result =
#30 0x00007f5f5ea8573c in QEventLoop::exec(QFlags) (this=0x7ffdd8d82410, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
d = 0x56504f1b53f0
threadData =
locker = {val = 94902918056152}
app =
#31 0x00007f5f5ea90269 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
threadData = 0x56504eb80800
eventLoop = { = {_vptr.QObject = 0x7f5f5ed11730 , static staticMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f5f5eb74920 <_ZL26qt_meta_stringdata_QObject.lto_priv.0>, data = 0x7f5f5eb74800 <_ZL20qt_meta_data_QObject.lto_priv.0>, static_metacall = 0x7f5f5eabde80 , relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x56504f1b53f0}, static staticQtMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f5f5eb9b500 <_ZL21qt_meta_stringdata_Qt.lto_priv.0>, data = 0x7f5f5eb98680 <_ZL15qt_meta_data_Qt.lto_priv.0>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7f5f5ed0a560 }, stringdata = 0x7f5f5eb702e0 <_ZL29qt_meta_stringdata_QEventLoop.lto_priv.0>, data = 0x7f5f5eb70280 <_ZL23qt_meta_data_QEventLoop.lto_priv.0>, static_metacall = 0x7f5f5ea83f80 , relatedMetaObjects = 0x0, extradata = 0x0}}}
returnCode =
#32 0x000056504d36cc5d in main(int, char**) (argc=2, argv=0x7ffdd8d826d8) at /home/ratijas/kde/src/kde/workspace/plasma-workspace/shell/main.cpp:255
format = {d = 0x56504eb8afb0}
qpaVariable = false
app = { = { = { = {_vptr.QObject = 0x7f5f5fe83660 , static staticMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f5f5eb74920 <_ZL26qt_meta_stringdata_QObject.lto_priv.0>, data = 0x7f5f5eb74800 <_ZL20qt_meta_data_QObject.lto_priv.0>, static_metacall = 0x7f5f5eabde80 , relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x56504eb8b2b0}, static staticQtMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f5f5eb9b500 <_ZL21qt_meta_stringdata_Qt.lto_priv.0>, data = 0x7f5f5eb98680 <_ZL15qt_meta_data_Qt.lto_priv.0>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7f5f5ed0a560 }, stringdata = 0x7f5f5eb70060 <_ZL35qt_meta_stringdata_QCoreApplication.lto_priv.0>, data = 0x7f5f5eb6ff40 <_ZL29qt_meta_data_QCoreApplication.lto_priv.0>, static_metacall = 0x7f5f5ea8f870 , relatedMetaObjects = 0x0, extradata = 0x0}}, static self = 0x7ffdd8d82560}, static staticMetaObject = {d = {superdata = {direct = 0x7f5f5ed0f380 }, stringdata = 0x7f5f5f35b720 <_ZL34qt_meta_stringdata_QGuiApplication.lto_priv.0>, data = 0x7f5f5f35b4a0 <_ZL28qt_meta_data_QGuiApplication.lto_priv.0>, static_metacall = 0x7f5f5ef4b7e0 , relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7f5f5f447e80 }, stringdata = 0x7f5f5fd468e0 <_ZL31qt_meta_stringdata_QApplication.lto_priv.0>, data = 0x7f5f5fd46760 <_ZL25qt_meta_data_QApplication.lto_priv.0>, static_metacall = 0x7f5f5f97a3f0 , relatedMetaObjects = 0x0, extradata = 0x0}}}
aboutData = {d = std::unique_ptr = {get() = 0x56504edd09a0}}
replace = false
corona = 0x56504eeed510
__PRETTY_FUNCTION__ = "int main(int, char**)"
service = { = {_vptr.QObject = 0x7f5f60fbd680 , static staticMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f5f5eb74920 <_ZL26qt_meta_stringdata_QObject.lto_priv.0>, data = 0x7f5f5eb74800 <_ZL20qt_meta_data_QObject.lto_priv.0>, static_metacall = 0x7f5f5eabde80 , relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x56504f11cb50}, static staticQtMetaObject = {d = {superdata = {direct = 0x0}, stringdata = 0x7f5f5eb9b500 <_ZL21qt_meta_stringdata_Qt.lto_priv.0>, data = 0x7f5f5eb98680 <_ZL15qt_meta_data_Qt.lto_priv.0>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = {direct = 0x7f5f5ed0a560 }, stringdata = 0x7f5f60faf0c0 , data = 0x7f5f60faf360 , static_metacall = 0x7f5f60f9ae7a , relatedMetaObjects = 0x0, extradata = 0x0}}, d = std::unique_ptr = {get() = 0x56504f1127b0}}
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Some events tend to cause hangs and block UI forever, while an application is inspected with GammaRay. Note that it is not the GammaRay itself that hangs up, but the application that it attaches to.
Most notably, it often happens when a popup is about to appear. It also happens consistently when entering edit mode in Plasmoid Viewer (KDE/Plasma debugger tool on its own).
When such hang is triggered, application starts spamming in console output like this:
It may happen with both Widgets and QML applications.
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