Bug 316964

Summary:	Freeze on startup when composer window is restored [Nepomuk2::Resource::Resource -> QMutex::lock]
Product:	[Applications] kmail2	Reporter:	Milian Wolff <mail>
Component:	composer	Assignee:	kdepim bugs <pim-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	faure, me, winter
Priority:	NOR
Version First Reported In:	4.10.1
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Milian Wolff 2013-03-18 11:54:08 UTC

Hey all,

I managed to make my KMail freeze reliably on every startup. Last time I closed it I had a composer window open with a new email which I did not send. Now, on startup, it restores this window and triggers a deadlock.

(gdb) thread apply all bt

Thread 6 (Thread 0x7f26ceed8700 (LWP 1699)):
#0  0x00007f26ee22b954 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f26e406aaf5 in ?? () from /usr/lib/libQtWebKit.so.4
#2  0x00007f26e406ab49 in ?? () from /usr/lib/libQtWebKit.so.4
#3  0x00007f26ee227e0f in start_thread () from /usr/lib/libpthread.so.0
#4  0x00007f26f03f7efd in clone () from /usr/lib/libc.so.6

Thread 5 (Thread 0x7f268dd46700 (LWP 1700)):
#0  0x00007f26ee22b954 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f26e3db1059 in ?? () from /usr/lib/libQtWebKit.so.4
#2  0x00007f26e409927e in ?? () from /usr/lib/libQtWebKit.so.4
#3  0x00007f26ee227e0f in start_thread () from /usr/lib/libpthread.so.0
#4  0x00007f26f03f7efd in clone () from /usr/lib/libc.so.6

Thread 4 (Thread 0x7f268cff6700 (LWP 1711)):
#0  0x00007f26f03eefad in poll () from /usr/lib/libc.so.6
#1  0x00007f26e87f3b14 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007f26e87f3c34 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007f26f0d7ab86 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#4  0x00007f26f0d4b3ff in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#5  0x00007f26f0d4b688 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#6  0x00007f26f0c4c8a0 in QThread::exec() () from /usr/lib/libQtCore.so.4
#7  0x00007f26f0c4f87c in ?? () from /usr/lib/libQtCore.so.4
#8  0x00007f26ee227e0f in start_thread () from /usr/lib/libpthread.so.0
#9  0x00007f26f03f7efd in clone () from /usr/lib/libc.so.6

Thread 3 (Thread 0x7f2686e1d700 (LWP 1712)):
#0  0x00007f26ee22bd01 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#1  0x00007f26f0c4fd37 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#2  0x00007f26f0c4354f in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007f26f0c4f87c in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007f26ee227e0f in start_thread () from /usr/lib/libpthread.so.0
#5  0x00007f26f03f7efd in clone () from /usr/lib/libc.so.6

Thread 2 (Thread 0x7f2685dbb700 (LWP 1716)):
#0  0x00007f26f03f0d53 in select () from /usr/lib/libc.so.6
#1  0x00007f26e10a1640 in ?? () from /usr/lib/libsopranoclient.so.1
#2  0x00007f26e10a3f94 in ?? () from /usr/lib/libsopranoclient.so.1
---Type <return> to continue, or q <return> to quit---
#3  0x00007f26e10a73d3 in ?? () from /usr/lib/libsopranoclient.so.1
#4  0x00007f26e8deffe5 in ?? () from /usr/lib/libnepomukcore.so.4
#5  0x00007f26e8de1645 in ?? () from /usr/lib/libnepomukcore.so.4
#6  0x00007f26e8df4e29 in Nepomuk2::Resource::determineFinalResourceData() const () from /usr/lib/libnepomukcore.so.4
#7  0x00007f26e8df5554 in Nepomuk2::Resource::property(QUrl const&) const () from /usr/lib/libnepomukcore.so.4
#8  0x00007f26ec68a10a in ?? () from /usr/lib/libmessagecore.so.4
#9  0x00007f26f0c4345d in ?? () from /usr/lib/libQtCore.so.4
#10 0x00007f26f0c4f87c in ?? () from /usr/lib/libQtCore.so.4
#11 0x00007f26ee227e0f in start_thread () from /usr/lib/libpthread.so.0
#12 0x00007f26f03f7efd in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7f26f3081780 (LWP 1682)):
#0  0x00007f26f03f3b69 in syscall () from /usr/lib/libc.so.6
#1  0x00007f26f0c4e324 in ?? () from /usr/lib/libQtCore.so.4
#2  0x00007f26f0c4a66d in QMutex::lock() () from /usr/lib/libQtCore.so.4
#3  0x00007f26e8df43d0 in Nepomuk2::Resource::Resource() () from /usr/lib/libnepomukcore.so.4
#4  0x00007f26e8e22b02 in Nepomuk2::Query::Result::Result() () from /usr/lib/libnepomukcore.so.4
#5  0x00007f26e8e28640 in ?? () from /usr/lib/libnepomukcore.so.4
#6  0x00007f26f0d58cfc in QMetaType::construct(int, void const*) () from /usr/lib/libQtCore.so.4
#7  0x00007f26f0d71f76 in ?? () from /usr/lib/libQtCore.so.4
#8  0x00007f26f12ab6a8 in ?? () from /usr/lib/libQtGui.so.4
#9  0x00007f26f0d6d49f in QVariant::QVariant(int, void const*) () from /usr/lib/libQtCore.so.4
#10 0x00007f26ee48ba28 in ?? () from /usr/lib/libQtDBus.so.4
#11 0x00007f26ee492615 in QDBusMetaType::typeToSignature(int) () from /usr/lib/libQtDBus.so.4
#12 0x00007f26ee48c1f2 in QDBusArgument::beginArray(int) () from /usr/lib/libQtDBus.so.4
#13 0x00007f26e8e2883b in ?? () from /usr/lib/libnepomukcore.so.4
#14 0x00007f26ee492aa5 in QDBusMetaType::marshall(QDBusArgument&, int, void const*) () from /usr/lib/libQtDBus.so.4
#15 0x00007f26ee48ba5b in ?? () from /usr/lib/libQtDBus.so.4
#16 0x00007f26ee492615 in QDBusMetaType::typeToSignature(int) () from /usr/lib/libQtDBus.so.4
#17 0x00007f26ee48a657 in ?? () from /usr/lib/libQtDBus.so.4
#18 0x00007f26ee458223 in ?? () from /usr/lib/libQtDBus.so.4
#19 0x00007f26ee459b30 in ?? () from /usr/lib/libQtDBus.so.4
#20 0x00007f26ee4648fb in ?? () from /usr/lib/libQtDBus.so.4
#21 0x00007f26f0d65d9d in QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) ()
   from /usr/lib/libQtCore.so.4
#22 0x00007f26e8e25ae3 in Nepomuk2::Query::QueryServiceClient::Private::_k_handleQueryReply(QDBusPendingCallWatcher*) ()
   from /usr/lib/libnepomukcore.so.4
#23 0x00007f26e8e26a80 in ?? () from /usr/lib/libnepomukcore.so.4
#24 0x00007f26f0d61b8f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
---Type <return> to continue, or q <return> to quit---
#25 0x00007f26ee49846f in QDBusPendingCallWatcher::finished(QDBusPendingCallWatcher*) () from /usr/lib/libQtDBus.so.4
#26 0x00007f26f0d6106e in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#27 0x00007f26f127518c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#28 0x00007f26f127960a in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#29 0x00007f26f2aaa8c6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#30 0x00007f26f0d4c6ae in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#31 0x00007f26f0d50011 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#32 0x00007f26f0d7a9d3 in ?? () from /usr/lib/libQtCore.so.4
#33 0x00007f26e87f3845 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0x00007f26e87f3b78 in ?? () from /usr/lib/libglib-2.0.so.0
#35 0x00007f26e87f3c34 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0x00007f26f0d7ab66 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#37 0x00007f26f131569e in ?? () from /usr/lib/libQtGui.so.4
#38 0x00007f26f0d4b3ff in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#39 0x00007f26f0d4b688 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#40 0x00007f26f0d50328 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#41 0x0000000000402ccd in ?? ()
#42 0x00007f26f0330a15 in __libc_start_main () from /usr/lib/libc.so.6
#43 0x0000000000403195 in _start ()


Reproducible: Always

Steps to Reproduce:
1. open composer, write something
2. close kmail
3. restart
Actual Results:  
deadlock on startup

Expected Results:  
no deadlock

Comment 1 Allen Winter 2013-03-18 12:55:13 UTC

adding David and VHanda.  They both know a lot about this stuff.

Comment 2 Allen Winter 2013-11-20 21:01:16 UTC

Milian
think we can resolve this one?

Comment 3 Milian Wolff 2013-11-21 10:01:31 UTC

Indeed, I cannot reproduce it anymore.

Thanks