Bug 350866

Summary: plasmashell segfaults on logout in PlasmaQuick::View::containment (use-after-free?)
Product: [Plasma] plasmashell Reporter: Peter Wu <peter>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED DUPLICATE    
Severity: crash CC: bhush94, bugs.kde.org.id324, kde, plasma-bugs
Priority: NOR    
Version: 5.3.0   
Target Milestone: 1.0   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: gdb backtrace (with debugging symbols; normal and full)

Description Peter Wu 2015-08-01 20:06:41 UTC 
On logout, plasmashell crashes (randomly?). It crashes in src/plasmaquick/view.cpp because "d" is 0:
246 Plasma::Containment *View::containment() const
247 {
248     return d->containment;
249 }
"d" can only be 0 if the destructor is called... use-after-free?

See attached gdb log (bt, frame, p d, p &d, bt f). Possibly related report: https://forum.kde.org/viewtopic.php?f=289&t=127421

Reproducible: Sometimes

Steps to Reproduce:
1. Logout from plasmashell

Actual Results:  
plasma segfaults

Expected Results:  
plasma should not segfault and exit cleanly.

Package versions on Arch Linux (recompiled to include debugging symbols):
Qt 5.5.0 (with two patches applied to fix crashes on multi-monitor handling, https://bugs.archlinux.org/task/43986#comment137773).
plasma-frameworks 5.12.0
plasma-workspace 5.3.2

Desktop contains a battery monitor widget (with three batteries), a CPU load monitor (for total load), a memory monitor (RAM only) and a network monitor (eth0, wlan0).

An external HDMI monitor was connected to this laptop.
Comment 1 Peter Wu 2015-08-01 20:07:36 UTC 
Created attachment 93835 [details]
gdb backtrace (with debugging symbols; normal and full)
Comment 2 Victor B. Gonzalez 2015-08-19 18:22:45 UTC 
I'm on Fedora 22 and Plasma always segfaulted on logout. I just recently enabled "test updates" and upgraded to "dvratil/plasma-5-beta" and it still happens, just less. How can I help with reporting this?
Comment 3 Marco Martin 2015-09-29 11:30:05 UTC 
pasting inline 
#0  PlasmaQuick::View::containment (this=0x3220ff0) at /shared/src/plasma-framework-5.12.0/src/plasmaquick/view.cpp:248
#1  0x000000000044d9f6 in ShellCorona::screenForContainment (this=0x2697c70, containment=0x5c74960) at /build/src/plasma-workspace-5.3.2/shell/shellcorona.cpp:1455
#2  0x00007fb7efbd4a51 in ContainmentInterface::availableScreenRect (this=0x506ef20) at /shared/src/plasma-framework-5.12.0/src/scriptengines/qml/plasmoid/containmentinterface.cpp:223
#3  0x00007fb7efbde1dd in ContainmentInterface::qt_static_metacall (_o=_o@entry=0x506ef20, _c=_c@entry=QMetaObject::ReadProperty, _id=_id@entry=5, _a=_a@entry=0x7fffe05c7230) at /shared/src/build/src/scriptengines/qml/moc_containmentinterface.cpp:359
#4  0x00007fb7efbdea5b in ContainmentInterface::qt_metacall (this=0x506ef20, _c=QMetaObject::ReadProperty, _id=5, _a=0x7fffe05c7230) at /shared/src/build/src/scriptengines/qml/moc_containmentinterface.cpp:417
#5  0x00007fb81974cf89 in QV4::QQmlValueTypeReference::readReferenceValue (this=this@entry=0x7fb706f8d0c0) at qml/qqmlvaluetypewrapper.cpp:161
#6  0x00007fb81974dbea in QV4::QQmlValueTypeWrapper::get (m=0x7fb706f8d0c0, name=0x7fb706f8d0b8, hasProperty=0x0) at qml/qqmlvaluetypewrapper.cpp:338
#7  0x00007fb8196ae97e in get (hasProperty=0x0, name=<optimized out>, this=<optimized out>) at jsruntime/qv4object_p.h:276
#8  QV4::Runtime::getProperty (engine=0x644a880, object=..., nameIndex=<optimized out>) at jsruntime/qv4runtime.cpp:672
#9  0x00007fb707c05f95 in ?? ()
#10 0x00007fb7352f00c8 in ?? ()
#11 0x9eb41393c302a600 in ?? ()
#12 0x00007fb740107b20 in ?? ()
#13 0x0000000000000002 in ?? ()
#14 0x00007fffe05c7510 in ?? ()
#15 0x00007fb8165bf6a4 in QMetaObjectPrivate::signal (m=0x65697a0, signal_index=-530811872) at kernel/qmetaobject.cpp:868
#16 0x00007fb8196517ba in QV4::SimpleScriptFunction::call (that=<optimized out>, callData=<optimized out>) at jsruntime/qv4functionobject.cpp:564
#17 0x00007fb81974176f in call (d=0x7fb706f8d008, this=<optimized out>) at ../../include/QtQml/5.5.0/QtQml/private/../../../../../src/qml/jsruntime/qv4object_p.h:302
#18 QQmlJavaScriptExpression::evaluate (this=this@entry=0x65c6e90, context=<optimized out>, function=..., callData=callData@entry=0x7fb706f8d008, isUndefined=isUndefined@entry=0x7fffe05c766c) at qml/qqmljavascriptexpression.cpp:158
#19 0x00007fb819741c9d in QQmlJavaScriptExpression::evaluate (this=this@entry=0x65c6e90, context=<optimized out>, function=..., isUndefined=isUndefined@entry=0x7fffe05c766c) at qml/qqmljavascriptexpression.cpp:116
#20 0x00007fb8197487dc in QQmlBinding::update (this=0x65c6e70, flags=...) at qml/qqmlbinding.cpp:194
#21 0x00007fb819748c9e in update (this=<optimized out>) at qml/qqmlbinding_p.h:97
#22 QQmlBinding::expressionChanged (e=<optimized out>) at qml/qqmlbinding.cpp:260
#23 0x00007fb819724c77 in QQmlNotifier::emitNotify (endpoint=0x65c7538, a=a@entry=0x0) at qml/qqmlnotifier.cpp:73
#24 0x00007fb819724c3e in QQmlNotifier::emitNotify (endpoint=0x65c75a8, a=a@entry=0x0) at qml/qqmlnotifier.cpp:68
#25 0x00007fb819724c3e in QQmlNotifier::emitNotify (endpoint=0x65c7618, a=a@entry=0x0) at qml/qqmlnotifier.cpp:68
#26 0x00007fb819724c3e in QQmlNotifier::emitNotify (endpoint=0x65c7688, a=a@entry=0x0) at qml/qqmlnotifier.cpp:68
#27 0x00007fb8196c78bc in QQmlData::signalEmitted (object=0x506ef20, index=64, a=0x0) at qml/qqmlengine.cpp:751
#28 0x00007fb8165e38f0 in QMetaObject::activate (sender=0x506ef20, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3604
#29 0x00007fb8165e3e77 in call (a=0x7fffe05c7a60, r=0x506ef20, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
#30 QMetaObject::activate (sender=sender@entry=0x2697c70, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=4, argv=argv@entry=0x0) at kernel/qobject.cpp:3703
#31 0x00007fb8165e47e7 in QMetaObject::activate (sender=sender@entry=0x2697c70, m=m@entry=0x7fb81acd0d20 <Plasma::Corona::staticMetaObject>, local_signal_index=local_signal_index@entry=4, argv=argv@entry=0x0) at kernel/qobject.cpp:3583
#32 0x00007fb81aa52a33 in Plasma::Corona::availableScreenRectChanged (this=this@entry=0x2697c70) at /shared/src/build/src/plasma/moc_corona.cpp:369
#33 0x000000000044f778 in ShellCorona::containmentDeleted (this=0x2697c70, cont=<optimized out>) at /build/src/plasma-workspace-5.3.2/shell/shellcorona.cpp:979
#34 0x0000000000457714 in ShellCorona::qt_static_metacall (_o=_o@entry=0x2697c70, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=30, _a=_a@entry=0x7fffe05c7c40) at /build/src/build/shell/moc_shellcorona.cpp:296
#35 0x00007fb8165e3fea in QMetaObject::activate (sender=sender@entry=0x2699d30, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffe05c7c40) at kernel/qobject.cpp:3718
#36 0x00007fb8165e47e7 in QMetaObject::activate (sender=sender@entry=0x2699d30, m=m@entry=0x7fb8169f2b80 <QObject::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffe05c7c40) at kernel/qobject.cpp:3583
#37 0x00007fb8165e488f in QObject::destroyed (this=this@entry=0x2699d30, _t1=_t1@entry=0x2699d30) at .moc/moc_qobject.cpp:211
#38 0x00007fb8165ebdfa in QObject::~QObject (this=0x2699d30, __in_chrg=<optimized out>) at kernel/qobject.cpp:904
#39 0x00007fb81aa4ae69 in Plasma::Containment::~Containment (this=0x2699d30, __in_chrg=<optimized out>) at /shared/src/plasma-framework-5.12.0/src/plasma/containment.cpp:94
#40 0x0000000000454de6 in qDeleteAll<QList<Plasma::Containment*>::const_iterator> (end=..., begin=...) at /usr/include/qt/QtCore/qalgorithms.h:317
#41 qDeleteAll<QList<Plasma::Containment*> > (c=QList<Plasma::Containment *> = {...}) at /usr/include/qt/QtCore/qalgorithms.h:325
#42 ShellCorona::~ShellCorona (this=0x2697c70, __in_chrg=<optimized out>) at /build/src/plasma-workspace-5.3.2/shell/shellcorona.cpp:182
#43 0x0000000000455049 in ShellCorona::~ShellCorona (this=0x2697c70, __in_chrg=<optimized out>) at /build/src/plasma-workspace-5.3.2/shell/shellcorona.cpp:184
#44 0x00007fb8165e252b in QObjectPrivate::deleteChildren (this=this@entry=0x268f4a0) at kernel/qobject.cpp:1951
#45 0x00007fb8165ec280 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:1031
#46 0x000000000045cb19 in ShellManager::~ShellManager (this=0x268b9e0, __in_chrg=<optimized out>) at /build/src/plasma-workspace-5.3.2/shell/shellmanager.cpp:94
#47 0x00007fb8165e4ed0 in QObject::event (this=0x268b9e0, e=<optimized out>) at kernel/qobject.cpp:1237
#48 0x00007fb81798400c in QApplicationPrivate::notify_helper (this=this@entry=0x2597f90, receiver=receiver@entry=0x268b9e0, e=e@entry=0x5885900) at kernel/qapplication.cpp:3717
#49 0x00007fb8179894e6 in QApplication::notify (this=0x7fffe05c8330, receiver=0x268b9e0, e=0x5885900) at kernel/qapplication.cpp:3500
#50 0x00007fb8165b589b in QCoreApplication::notifyInternal (this=0x7fffe05c8330, receiver=0x268b9e0, event=event@entry=0x5885900) at kernel/qcoreapplication.cpp:965
#51 0x00007fb8165b7c96 in sendEvent (event=0x5885900, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:224
#52 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=52, data=0x258e4a0) at kernel/qcoreapplication.cpp:1593
#53 0x00007fb8165b8178 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=52) at kernel/qcoreapplication.cpp:1451
#54 0x00007fb8165bb249 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1236
#55 0x00007fb816b0c40c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1528
#56 0x00007fb817980475 in QApplication::exec () at kernel/qapplication.cpp:2977
#57 0x000000000042df06 in main (argc=2, argv=<optimized out>) at /build/src/plasma-workspace-5.3.2/shell/main.cpp:154
#0  PlasmaQuick::View::containment (this=0x3220ff0) at /shared/src/plasma-framework-5.12.0/src/plasmaquick/view.cpp:248
248	    return d->containment;
$1 = (PlasmaQuick::ViewPrivate * const) 0x0
$2 = (PlasmaQuick::ViewPrivate * const *) 0x3221018
#0  PlasmaQuick::View::containment (this=0x3220ff0) at /shared/src/plasma-framework-5.12.0/src/plasmaquick/view.cpp:248
No locals.
#1  0x000000000044d9f6 in ShellCorona::screenForContainment (this=0x2697c70, containment=0x5c74960) at /build/src/plasma-workspace-5.3.2/shell/shellcorona.cpp:1455
        i = 0
#2  0x00007fb7efbd4a51 in ContainmentInterface::availableScreenRect (this=0x506ef20) at /shared/src/plasma-framework-5.12.0/src/scriptengines/qml/plasmoid/containmentinterface.cpp:223
        rect = {x1 = 0, y1 = 0, x2 = 1599, y2 = 899}
        screenId = <optimized out>
#3  0x00007fb7efbde1dd in ContainmentInterface::qt_static_metacall (_o=_o@entry=0x506ef20, _c=_c@entry=QMetaObject::ReadProperty, _id=_id@entry=5, _a=_a@entry=0x7fffe05c7230) at /shared/src/build/src/scriptengines/qml/moc_containmentinterface.cpp:359
        _t = 0x506ef20
        _v = 0x26a70d0
#4  0x00007fb7efbdea5b in ContainmentInterface::qt_metacall (this=0x506ef20, _c=QMetaObject::ReadProperty, _id=5, _a=0x7fffe05c7230) at /shared/src/build/src/scriptengines/qml/moc_containmentinterface.cpp:417
No locals.
#5  0x00007fb81974cf89 in QV4::QQmlValueTypeReference::readReferenceValue (this=this@entry=0x7fb706f8d0c0) at qml/qqmlvaluetypewrapper.cpp:161
        args = {0x26a70d0, 0x0}
        writebackProperty = {mobj = 0x7fb7efdf1820 <ContainmentInterface::staticMetaObject>, handle = 239, idx = 5, menum = {mobj = 0x0, handle = 0}}
#6  0x00007fb81974dbea in QV4::QQmlValueTypeWrapper::get (m=0x7fb706f8d0c0, name=0x7fb706f8d0b8, hasProperty=0x0) at qml/qqmlvaluetypewrapper.cpp:338
        r = 0x7fb706f8d0c0
        metaObject = 0x300000000
        index = -1632365677
        gadget = <optimized out>
        v = {d = {data = {c = -1 '\377', uc = 255 '\377', s = -1, sc = -1 '\377', us = 65535, i = -1, u = 4294967295, l = 4294967295, ul = 4294967295, b = 255, d = 2.1219957904712067e-314, f = -nan(0x7fffff), real = 2.1219957904712067e-314, ll = 4294967295, ull = 4294967295, o = 0xffffffff, ptr = 0xffffffff, shared = 0xffffffff}, type = 1073676288, is_shared = 1, is_null = 1}}
        args = {0x5b54ac0, 0x7fb700000000}
#7  0x00007fb8196ae97e in get (hasProperty=0x0, name=<optimized out>, this=<optimized out>) at jsruntime/qv4object_p.h:276
No locals.
#8  QV4::Runtime::getProperty (engine=0x644a880, object=..., nameIndex=<optimized out>) at jsruntime/qv4runtime.cpp:672
        scope = {engine = 0x644a880, mark = 0x7fb706f8d0b8}
        name = {ptr = 0x7fb706f8d0b8}
#9  0x00007fb707c05f95 in ?? ()
No symbol table info available.
#10 0x00007fb7352f00c8 in ?? ()
No symbol table info available.
#11 0x9eb41393c302a600 in ?? ()
No symbol table info available.
#12 0x00007fb740107b20 in ?? ()
No symbol table info available.
#13 0x0000000000000002 in ?? ()
No symbol table info available.
#14 0x00007fffe05c7510 in ?? ()
No symbol table info available.
#15 0x00007fb8165bf6a4 in QMetaObjectPrivate::signal (m=0x65697a0, signal_index=-530811872) at kernel/qmetaobject.cpp:868
        result = {mobj = 0x0, handle = 0}
        i = -530811872
#16 0x00007fb8196517ba in QV4::SimpleScriptFunction::call (that=<optimized out>, callData=<optimized out>) at jsruntime/qv4functionobject.cpp:564
        v4 = 0x644a880
        scope = {engine = 0x644a880, mark = <optimized out>}
        ctxSaver = {engine = 0x644a880, savedContext = 0x7fb706f8d0b8}
        ctx = {<QV4::Heap::ExecutionContext> = {<QV4::Heap::Base> = {{vtable = 0x7fb819a9d300 <QV4::CallContext::static_vtbl>, mm_data = 140428681270016}}, callData = 0x7fb706f8d008, engine = 0x644a880, parent = 0x7fb707ce4030, outer = 0x7fb707cd4ab0, lookups = 0x0, compilationUnit = 0x7fb70c0eb0c0, type = QV4::Heap::ExecutionContext::Type_SimpleCallContext, strictMode = false, lineNumber = 59}, function = 0x7fb707bd71f0, locals = 0x7fb706f8d068, activation = 0x0}
        result = <optimized out>
#17 0x00007fb81974176f in call (d=0x7fb706f8d008, this=<optimized out>) at ../../include/QtQml/5.5.0/QtQml/private/../../../../../src/qml/jsruntime/qv4object_p.h:302
No locals.
#18 QQmlJavaScriptExpression::evaluate (this=this@entry=0x65c6e90, context=<optimized out>, function=..., callData=callData@entry=0x7fb706f8d008, isUndefined=isUndefined@entry=0x7fffe05c766c) at qml/qqmljavascriptexpression.cpp:158
        watcher = {_c = 0x656f160, _w = 0x7fffe05c7560, _s = 0x65c6e90}
        capture = {<QQmlEnginePrivate::PropertyCapture> = {_vptr.PropertyCapture = 0x7fb819a953c0 <vtable for QQmlJavaScriptExpression::GuardCapture+16>}, engine = 0x6024160, expression = 0x65c6e90, watcher = 0x7fffe05c7550, guards = {_first = 0x0, _last = 0x0, _flag = 0, _count = 0}, errorString = 0x0}
        lastPropertyCapture = 0x0
        scope = {engine = 0x644a880, mark = 0x7fb706f8d048}
        result = {ptr = 0x7fb706f8d048}
#19 0x00007fb819741c9d in QQmlJavaScriptExpression::evaluate (this=this@entry=0x65c6e90, context=<optimized out>, function=..., isUndefined=isUndefined@entry=0x7fffe05c766c) at qml/qqmljavascriptexpression.cpp:116
No locals.
#20 0x00007fb8197487dc in QQmlBinding::update (this=0x65c6e70, flags=...) at qml/qqmlbinding.cpp:194
        isUndefined = false
        result = <optimized out>
        needsErrorLocationData = <optimized out>
        prof = {<QQmlProfilerHelper> = {<QQmlProfilerDefinitions> = {<No data fields>}, profiler = 0x0}, <No data fields>}
        watcher = {_c = 0x656aec0, _w = 0x7fffe05c7680, _s = 0x65c6e70}
        scope = {engine = 0x644a880, mark = 0x7fb706f8d000}
        f = {ptr = 0x7fb706f8d000}
#21 0x00007fb819748c9e in update (this=<optimized out>) at qml/qqmlbinding_p.h:97
No locals.
#22 QQmlBinding::expressionChanged (e=<optimized out>) at qml/qqmlbinding.cpp:260
        This = <optimized out>
#23 0x00007fb819724c77 in QQmlNotifier::emitNotify (endpoint=0x65c7538, a=a@entry=0x0) at qml/qqmlnotifier.cpp:73
        originalSenderPtr = 0
        disconnectWatch = 0x7fffe05c7740
#24 0x00007fb819724c3e in QQmlNotifier::emitNotify (endpoint=0x65c75a8, a=a@entry=0x0) at qml/qqmlnotifier.cpp:68
        originalSenderPtr = 0
        disconnectWatch = 0x7fffe05c7770
#25 0x00007fb819724c3e in QQmlNotifier::emitNotify (endpoint=0x65c7618, a=a@entry=0x0) at qml/qqmlnotifier.cpp:68
        originalSenderPtr = 84340512
        disconnectWatch = 0x7fffe05c77a0
#26 0x00007fb819724c3e in QQmlNotifier::emitNotify (endpoint=0x65c7688, a=a@entry=0x0) at qml/qqmlnotifier.cpp:68
        originalSenderPtr = 84340512
        disconnectWatch = 0x7fffe05c77d0
#27 0x00007fb8196c78bc in QQmlData::signalEmitted (object=0x506ef20, index=64, a=0x0) at qml/qqmlengine.cpp:751
No locals.
#28 0x00007fb8165e38f0 in QMetaObject::activate (sender=0x506ef20, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3604
        signal_index = 64
        empty_argv = {0x2d8da40}
        currentThreadId = <optimized out>
#29 0x00007fb8165e3e77 in call (a=0x7fffe05c7a60, r=0x506ef20, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:124
No locals.
#30 QMetaObject::activate (sender=sender@entry=0x2697c70, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=4, argv=argv@entry=0x0) at kernel/qobject.cpp:3703
        obj = <optimized out>
        receiverInSameThread = <optimized out>
        sw = {receiver = 0x506ef20, previousSender = 0x0, currentSender = {sender = 0x2697c70, signal = 7, ref = 1}, switched = true}
        callFunction = 0x661aac0
        receiver = 0x506ef20
        method_relative = <optimized out>
        c = 0x661a730
        last = 0x690c490
        locker = {val = 140428630319360}
        connectionLists = {connectionLists = 0x2691000}
        list = <optimized out>
        signal_index = 7
        empty_argv = {0x0}
        currentThreadId = 0x7fb81c37c800
#31 0x00007fb8165e47e7 in QMetaObject::activate (sender=sender@entry=0x2697c70, m=m@entry=0x7fb81acd0d20 <Plasma::Corona::staticMetaObject>, local_signal_index=local_signal_index@entry=4, argv=argv@entry=0x0) at kernel/qobject.cpp:3583
No locals.
#32 0x00007fb81aa52a33 in Plasma::Corona::availableScreenRectChanged (this=this@entry=0x2697c70) at /shared/src/build/src/plasma/moc_corona.cpp:369
No locals.
#33 0x000000000044f778 in ShellCorona::containmentDeleted (this=0x2697c70, cont=<optimized out>) at /build/src/plasma-workspace-5.3.2/shell/shellcorona.cpp:979
No locals.
#34 0x0000000000457714 in ShellCorona::qt_static_metacall (_o=_o@entry=0x2697c70, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=30, _a=_a@entry=0x7fffe05c7c40) at /build/src/build/shell/moc_shellcorona.cpp:296
        _t = 0x2697c70
#35 0x00007fb8165e3fea in QMetaObject::activate (sender=sender@entry=0x2699d30, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffe05c7c40) at kernel/qobject.cpp:3718
        receiverInSameThread = <optimized out>
        sw = {receiver = 0x2697c70, previousSender = 0x0, currentSender = {sender = 0x2699d30, signal = 0, ref = 1}, switched = true}
        callFunction = 0x4573f0 <ShellCorona::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>
        receiver = 0x2697c70
        method_relative = <optimized out>
        c = 0x52b91e0
        last = 0x617b700
        locker = {val = 140428630319360}
        connectionLists = {connectionLists = 0x2cfb5f0}
        list = <optimized out>
        signal_index = 0
        empty_argv = {0x0}
        currentThreadId = 0x7fb81c37c800
#36 0x00007fb8165e47e7 in QMetaObject::activate (sender=sender@entry=0x2699d30, m=m@entry=0x7fb8169f2b80 <QObject::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fffe05c7c40) at kernel/qobject.cpp:3583
Comment 4 Kai Uwe Broulik 2015-11-25 21:58:37 UTC 

*** This bug has been marked as a duplicate of bug 348511 ***