Better backtrace in bug https://bugs.kde.org/show_bug.cgi?id=316087

It crashes if installed kernel with enabled debugging options. If I boot with kernel built without debugging options then no crash in kactivitymanagerd.

Update summary to mention "debug kernel", and pasting the backtrace from upstream bug:


Application: Диспетчер комнат KDE (kactivitymanagerd), signal: Segmentation fault
Using host libthread_db library "/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0xb3afe7c0 (LWP 1268))]

Thread 6 (Thread 0xb11f2b40 (LWP 1280)):
#0  0xb7703424 in __kernel_vsyscall ()
#1  0xb5877272 in clock_gettime () from /lib/libc.so.6
#2  0xb66a1b1d in qt_gettime() () from /lib/libQtCore.so.4
#3  0xb678bf43 in QTimerInfoList::timerWait(timeval&) () from /lib/libQtCore.so.4
#4  0xb678a503 in timerSourcePrepareHelper(GTimerSource*, int*) () from /lib/libQtCore.so.4
#5  0xb678a59d in timerSourcePrepare(_GSource*, int*) () from /lib/libQtCore.so.4
#6  0xb4615aab in g_main_context_prepare () from /lib/libglib-2.0.so.0
#7  0xb46163ff in g_main_context_iterate.isra.21 () from /lib/libglib-2.0.so.0
#8  0xb4616649 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#9  0xb678a78f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#10 0xb6758764 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#11 0xb6758aa1 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#12 0xb664177d in QThread::exec() () from /lib/libQtCore.so.4
#13 0x08056544 in Resources* runInQThread<Resources>()::Thread::run() ()
#14 0xb664416a in QThreadPrivate::start(void*) () from /lib/libQtCore.so.4
#15 0xb65c89da in start_thread () from /lib/libpthread.so.0
#16 0xb5862e9e in clone () from /lib/libc.so.6

Thread 5 (Thread 0xb07ffb40 (LWP 1281)):
#0  0xb7703424 in __kernel_vsyscall ()
#1  0xb585685b in poll () from /lib/libc.so.6
#2  0xb4625bbc in g_poll () from /lib/libglib-2.0.so.0
#3  0xb4616508 in g_main_context_iterate.isra.21 () from /lib/libglib-2.0.so.0
#4  0xb4616649 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#5  0xb678a78f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#6  0xb6758764 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#7  0xb6758aa1 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#8  0xb664177d in QThread::exec() () from /lib/libQtCore.so.4
#9  0x08056574 in Activities* runInQThread<Activities>()::Thread::run() ()
#10 0xb664416a in QThreadPrivate::start(void*) () from /lib/libQtCore.so.4
#11 0xb65c89da in start_thread () from /lib/libpthread.so.0
#12 0xb5862e9e in clone () from /lib/libc.so.6

Thread 4 (Thread 0xafffeb40 (LWP 1282)):
#0  0xb7703424 in __kernel_vsyscall ()
#1  0xb65cf25b in read () from /lib/libpthread.so.0
#2  0xb46598a6 in g_wakeup_acknowledge () from /lib/libglib-2.0.so.0
#3  0xb4615fdb in g_main_context_check () from /lib/libglib-2.0.so.0
#4  0xb461649a in g_main_context_iterate.isra.21 () from /lib/libglib-2.0.so.0
#5  0xb4616649 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#6  0xb678a78f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#7  0xb6758764 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#8  0xb6758aa1 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#9  0xb664177d in QThread::exec() () from /lib/libQtCore.so.4
#10 0x080565a4 in Features* runInQThread<Features>()::Thread::run() ()
#11 0xb664416a in QThreadPrivate::start(void*) () from /lib/libQtCore.so.4
#12 0xb65c89da in start_thread () from /lib/libpthread.so.0
#13 0xb5862e9e in clone () from /lib/libc.so.6

Thread 3 (Thread 0xaf41bb40 (LWP 1283)):
[KCrash Handler]
#6  0xb66530ed in QTime::addMSecs(int) const () from /lib/libQtCore.so.4
#7  0xb665496d in QDateTime::setMSecsSinceEpoch(long long) () from /lib/libQtCore.so.4
#8  0xb66549f7 in QDateTime::fromMSecsSinceEpoch(long long) () from /lib/libQtCore.so.4
#9  0xb0983170 in ActivityRanking::Private::processWeekData(QString const&, QString const&, long long, long long) () from /usr/lib/kde4/activitymanager_plugin_activityranking.so
#10 0xb0985de8 in ActivityRanking::Private::processActivityInterval(QString const&, QString const&, long long, long long) () from /usr/lib/kde4/activitymanager_plugin_activityranking.so
#11 0xb09862f0 in ActivityRanking::activityChanged(QString const&) [clone .part.17] () from /usr/lib/kde4/activitymanager_plugin_activityranking.so
#12 0xb0986bf9 in ActivityRanking::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) [clone .part.18] () from /usr/lib/kde4/activitymanager_plugin_activityranking.so
#13 0xb676b70b in QMetaCallEvent::placeMetaCall(QObject*) () from /lib/libQtCore.so.4
#14 0xb6773917 in QObject::event(QEvent*) () from /lib/libQtCore.so.4
#15 0xb5c07f74 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib/libQtGui.so.4
#16 0xb5c0ed04 in QApplication::notify(QObject*, QEvent*) () from /lib/libQtGui.so.4
#17 0xb71a1256 in KApplication::notify(QObject*, QEvent*) () from /lib/libkdeui.so.5
#18 0xb6759caa in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /lib/libQtCore.so.4
#19 0xb675cf24 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib/libQtCore.so.4
#20 0xb675d44d in QCoreApplication::sendPostedEvents(QObject*, int) () from /lib/libQtCore.so.4
#21 0xb678ae3f in postEventSourceDispatch(_GSource*, int (*)(void*), void*) () from /lib/libQtCore.so.4
#22 0xb46161d6 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#23 0xb4616588 in g_main_context_iterate.isra.21 () from /lib/libglib-2.0.so.0
#24 0xb4616649 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#25 0xb678a78f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#26 0xb6758764 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#27 0xb6758aa1 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#28 0xb664177d in QThread::exec() () from /lib/libQtCore.so.4
#29 0xb0988420 in ActivityRankingPlugin::init(QHash<QString, QObject*> const&)::Thread::run() () from /usr/lib/kde4/activitymanager_plugin_activityranking.so
#30 0xb664416a in QThreadPrivate::start(void*) () from /lib/libQtCore.so.4
#31 0xb65c89da in start_thread () from /lib/libpthread.so.0
#32 0xb5862e9e in clone () from /lib/libc.so.6

Thread 2 (Thread 0xaec1ab40 (LWP 1284)):
#0  0xb7703424 in __kernel_vsyscall ()
#1  0xb65cf25b in read () from /lib/libpthread.so.0
#2  0xb46598a6 in g_wakeup_acknowledge () from /lib/libglib-2.0.so.0
#3  0xb4615fdb in g_main_context_check () from /lib/libglib-2.0.so.0
#4  0xb461649a in g_main_context_iterate.isra.21 () from /lib/libglib-2.0.so.0
#5  0xb4616649 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#6  0xb678a78f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#7  0xb6758764 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#8  0xb6758aa1 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#9  0xb664177d in QThread::exec() () from /lib/libQtCore.so.4
#10 0xb6737e25 in QInotifyFileSystemWatcherEngine::run() () from /lib/libQtCore.so.4
#11 0xb664416a in QThreadPrivate::start(void*) () from /lib/libQtCore.so.4
#12 0xb65c89da in start_thread () from /lib/libpthread.so.0
#13 0xb5862e9e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb3afe7c0 (LWP 1268)):
#0  0xb7703424 in __kernel_vsyscall ()
#1  0xb65cf25b in read () from /lib/libpthread.so.0
#2  0xb46598a6 in g_wakeup_acknowledge () from /lib/libglib-2.0.so.0
#3  0xb4615fdb in g_main_context_check () from /lib/libglib-2.0.so.0
#4  0xb461649a in g_main_context_iterate.isra.21 () from /lib/libglib-2.0.so.0
#5  0xb4616649 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#6  0xb678a78f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#7  0xb5cb7def in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtGui.so.4
#8  0xb6758764 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#9  0xb6758aa1 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/libQtCore.so.4
#10 0xb675e33f in QCoreApplication::exec() () from /lib/libQtCore.so.4
#11 0xb5c062e5 in QApplication::exec() () from /lib/libQtGui.so.4
#12 0x08050243 in main ()

Proposing as F19Alpha blocker as per https://bugzilla.redhat.com/show_bug.cgi?id=928353#c37 .

Based on Kevin's comment, it seems not very reproducible even with debug kernel enabled. If it shows up as very frequent one, I can change my vote, but now

-1 blocker

Well, I haven't tried to reproduce it myself, my comment was based on what nucleo said in the original message: "If start KDE with clean configs no crash but becames crash after made some changes in settings (unclear what changes because restoring default settings not fixes crash)"

Looks like settings that makes kactivitymanagerd crash is disabling some of services in startup and shutdown.
If enable all of disabled services kactivitymanagerd still crashes and KDE started with empty black screen with panel.

I'm -1 at least until we have a clear reproducer from a fresh install.

This was discussed in the KDE SIG meeting today and we agreed that with the data we currently have, this is not a blocker.

How to reproduce 
0. Mak
1. Start 32-bit with debugging kernel such as kernel-3.9.0-0.rc5.git1.301.fc19
2. Make sure that after KDE restart no kcativitymanagerd crash.
3. Disable for example "Power Management" in "Startup and Shutdown"
4. Restart KDE

kcativitymanagerd crashes when KDE restarted.

If you have to make non-standard changes to KDE's config to trigger this bug, then it's not a blocker, I'd say. The bar for Alpha blocker is pretty high: the 10,000 foot summary is 'you must be able to install, boot, and install updates to fix everything else'. This bug seems pretty clearly not to clear that bar.

As this was proposed by Kevin / KDE SIG and they've now agreed it's not a blocker, let's just withdraw the nomination instead of waiting to vote on it. It can of course be re-nominated if new data emerge: this is a 'withdrawal without prejudice' :)

(In reply to comment #10)
> If you have to make non-standard changes to KDE's config to trigger this
> bug, then it's not a blocker

I don't insist that this bug is blocker but "Power Management" is a standard option in KDE systemsettings.

The point is that it (apparently) works with the default options. Generally, if it can be fixed in an update, it's usually not a blocker.

We should really figure out what causes this problem (miscompilation by GCC? bug in the code? something inbetween (invalid code that's now misoptimized by GCC)?), then we can push an update that fixes it.

Valgrind logs might be helpful.

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