[Bug 271943] New: Random crash when connecting

David Edmundson kde at davidedmundson.co.uk
Thu Apr 28 22:45:35 CEST 2011 

https://bugs.kde.org/show_bug.cgi?id=271943

           Summary: Random crash when connecting
           Product: telepathy
           Version: unspecified
          Platform: Unlisted Binaries
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: contactlist
        AssignedTo: kde-telepathy at kde.org
        ReportedBy: kde at davidedmundson.co.uk


Version:           unspecified
OS:                Linux

Application: Telepathy KDE Contact List (telepathy-kde-contactlist), signal:
Segmentation fault
[Current thread is 1 (Thread 0x7fb944da9780 (LWP 3090))]

Thread 6 (Thread 0x7fb9320e3700 (LWP 3091)):
#0  0x00007fb940ea9f03 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fb93dda8104 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb93dda8639 in g_main_context_iteration () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb942729446 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib/libQtCore.so.4
#4  0x00007fb9426fd882 in
QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib/libQtCore.so.4
#5  0x00007fb9426fdabc in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib/libQtCore.so.4
#6  0x00007fb942614924 in QThread::exec() () from /usr/lib/libQtCore.so.4
#7  0x00007fb9426dfc2f in ?? () from /usr/lib/libQtCore.so.4
#8  0x00007fb942617175 in ?? () from /usr/lib/libQtCore.so.4
#9  0x00007fb93eef9d8c in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#10 0x00007fb940eb704d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7fb931861700 (LWP 3109)):
#0  0x00007fb93eefef2b in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fb94261779e in QWaitCondition::wait(QMutex*, unsigned long) () from
/usr/lib/libQtCore.so.4
#2  0x00007fb94260c218 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007fb942617175 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fb93eef9d8c in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007fb940eb704d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7fb931060700 (LWP 3110)):
#0  0x00007fb93eefef2b in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fb94261779e in QWaitCondition::wait(QMutex*, unsigned long) () from
/usr/lib/libQtCore.so.4
#2  0x00007fb94260c218 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007fb942617175 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fb93eef9d8c in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007fb940eb704d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fb93085f700 (LWP 3111)):
#0  0x00007fb93eefef2b in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fb94261779e in QWaitCondition::wait(QMutex*, unsigned long) () from
/usr/lib/libQtCore.so.4
#2  0x00007fb94260c218 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007fb942617175 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fb93eef9d8c in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007fb940eb704d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fb92bfff700 (LWP 3112)):
#0  0x00007fb93eefef2b in pthread_cond_timedwait@@GLIBC_2.3.2 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fb94261779e in QWaitCondition::wait(QMutex*, unsigned long) () from
/usr/lib/libQtCore.so.4
#2  0x00007fb94260c218 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007fb942617175 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fb93eef9d8c in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007fb940eb704d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fb944da9780 (LWP 3090)):
[KCrash Handler]
#6  Tp::Connection::contactManager (this=0x0) at
/home/david/telepathy/telepathy-qt4/TelepathyQt4/connection.cpp:2259
#7  0x000000000043015a in MainWidget::monitorPresence (this=0x2214040,
account=...) at
/home/david/telepathy/telepathy-contact-list-new/main-widget.cpp:366
#8  0x0000000000430536 in MainWidget::onAccountConnectionStatusChanged
(this=0x2214040, status=Tp::ConnectionStatusConnected) at
/home/david/telepathy/telepathy-contact-list-new/main-widget.cpp:302
#9  0x00000000004306ed in MainWidget::qt_metacall (this=0x2214040,
_c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff1a28a9c0)
at /home/david/telepathy/telepathy-contact-list-new/build/main-widget.moc:144
#10 0x00007fb9427135f8 in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**) () from /usr/lib/libQtCore.so.4
#11 0x00007fb944735631 in Tp::Account::connectionStatusChanged (this=<value
optimized out>, _t1=Tp::ConnectionStatusConnected) at
/home/david/telepathy/telepathy-qt4/build/TelepathyQt4/_gen/account.moc.hpp:427
#12 0x00007fb9447415db in Tp::Account::Private::updateProperties
(this=0x2331d20, props=<value optimized out>) at
/home/david/telepathy/telepathy-qt4/TelepathyQt4/account.cpp:4058
#13 0x00007fb944745f34 in Tp::Account::qt_metacall (this=0x23314b0,
_c=QMetaObject::InvokeMetaMethod, _id=27, _a=0x7fff1a28bc00) at
/home/david/telepathy/telepathy-qt4/build/TelepathyQt4/_gen/account.moc.hpp:232
#14 0x00007fb9427135f8 in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**) () from /usr/lib/libQtCore.so.4
#15 0x00007fb9447356a5 in Tp::Client::AccountInterface::AccountPropertyChanged
(this=<value optimized out>, _t1=<value optimized out>) at
/home/david/telepathy/telepathy-qt4/build/TelepathyQt4/_gen/cli-account.moc.hpp:120
#16 0x00007fb94473c684 in Tp::Client::AccountInterface::qt_metacall
(this=0x22c7d10, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x7fff1a28bdf0) at
/home/david/telepathy/telepathy-qt4/build/TelepathyQt4/_gen/cli-account.moc.hpp:90
#17 0x00007fb942a539fa in ?? () from /usr/lib/libQtDBus.so.4
#18 0x00007fb942a5de4f in ?? () from /usr/lib/libQtDBus.so.4
#19 0x00007fb94271249a in QObject::event(QEvent*) () from
/usr/lib/libQtCore.so.4
#20 0x00007fb941abf9e4 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib/libQtGui.so.4
#21 0x00007fb941ac43aa in QApplication::notify(QObject*, QEvent*) () from
/usr/lib/libQtGui.so.4
#22 0x00007fb944271866 in KApplication::notify(QObject*, QEvent*) () from
/usr/lib/libkdeui.so.5
#23 0x00007fb9426fe49c in QCoreApplication::notifyInternal(QObject*, QEvent*)
() from /usr/lib/libQtCore.so.4
#24 0x00007fb942701c25 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () from /usr/lib/libQtCore.so.4
#25 0x00007fb942729253 in ?? () from /usr/lib/libQtCore.so.4
#26 0x00007fb93dda7bcd in g_main_context_dispatch () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007fb93dda83a8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007fb93dda8639 in g_main_context_iteration () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007fb9427293ef in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib/libQtCore.so.4
#30 0x00007fb941b66dfe in ?? () from /usr/lib/libQtGui.so.4
#31 0x00007fb9426fd882 in
QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib/libQtCore.so.4
#32 0x00007fb9426fdabc in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib/libQtCore.so.4
#33 0x00007fb942701ecb in QCoreApplication::exec() () from
/usr/lib/libQtCore.so.4
#34 0x000000000042854c in main (argc=1, argv=<value optimized out>) at
/home/david/telepathy/telepathy-contact-list-new/main.cpp:60

Reading that, the cause is that account->connection() returns 0.

The backtrace has it being called from onAccountConnectionStatusChanged

I think that simply checking "account->connectionStatus() ==
Tp::ConnectionStatusConnected"
Does not always mean that account->connection() will work.


Reproducible: Didn't try

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