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http://bugzilla.ubuntu.com/show_bug.cgi?id=14031
Ubuntu | libx11
Summary: race condition in konqueror, backtrace shows
XUnlockDisplay in libx11 as possible cause
Product: Ubuntu
Version: unspecified
Platform: i386
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: libx11
AssignedTo: debzilla@xxxxxxxxxx
ReportedBy: tobivollebregt@xxxxxxxxx
QAContact: kubuntu-bugs@xxxxxxxxxxxxxxxx
I've been experiencing random crashes of konqueror when opening new documents
or webpages. I captured 3
backtraces, two identical (besides function addresses of course).
By examining the first approx. 5 function calls of the backtraces I conclude
this is a race condition in
libx11, triggered by konqueror.
As almost always with race conditions, it's very hard to reproduce them, so I
can not (yet) provide a testcase
which has a high probability of reproducing the problem.
The next race condition happened twice when right clicking just after opening a
website with embedded ASF
video object.
(http://portal.omroep.nl/mplayer?&nav=vvnvGsHEbGcZtHjIjF&omroep=ogssGsHEbGcZtHjPpDqJ&mpstream=wmbb&mpurl=http%3A%2F%2Fcgi.omroep.nl%2Fcgi-bin%2Fstreams%3F%2Ftv%2Frkk%2Fkruispunt%2Fbb.20050821.asf&titel=WJD+journaal%3A+De+finale&afb=http%3A%2F%2Fwww.katholieknederland.nl%2Fimages%2Frtv_imglib%2Frtv_2375_wjdlogo.jpg&body=De+grote+finale%2C+wanneer+%E9%E9n+miljoen+jongeren+de+nacht+doorbrengen+in+het+open+veld+en+daar+wakend+de+uren+doorbrengen+om+in+de+ochtend+de+eucharistieviering+met+de+nieuwe+paus+Benedictus+XVI+bij+te+wonen.
+&progurl=http%3A%2F%2Fwww.katholieknederland.nl%2Fkruispunt%2Farchief%2F2005%2Fdetail_objectID2400.html)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
`system-supplied DSO at 0xffffe000' has disappeared; keeping its symbols.
[Thread debugging using libthread_db enabled]
[New Thread -1231984960 (LWP 12815)]
[KCrash handler]
#4 0xb72e2ea4 in pthread_mutex_lock ()
from /lib/tls/i686/cmov/libpthread.so.0
#5 0xb7d03cbe in pthread_mutex_lock () from /lib/tls/i686/cmov/libc.so.6
#6 0xb6aafc4c in XUnlockDisplay () from /usr/lib/libX11.so.6
#7 0xb6acb0bd in XrmEnumerateDatabase () from /usr/lib/libX11.so.6
#8 0xb6aaf135 in XKeysymToString () from /usr/lib/libX11.so.6
#9 0xb7443575 in KKeyServer::Sym::toString () from /usr/lib/libkdecore.so.4
#10 0xb7443af3 in KKeyServer::Sym::toStringInternal ()
from /usr/lib/libkdecore.so.4
#11 0xb7443b97 in KKey::toStringInternal () from /usr/lib/libkdecore.so.4
#12 0xb744472d in KKeySequence::toStringInternal ()
from /usr/lib/libkdecore.so.4
#13 0xb744601c in KShortcut::toStringInternal () from /usr/lib/libkdecore.so.4
#14 0xb7446339 in KAccelBase::insertConnection ()
from /usr/lib/libkdecore.so.4
#15 0xb744ff93 in KAccelBase::insert () from /usr/lib/libkdecore.so.4
#16 0xb745031f in KAccel::insert () from /usr/lib/libkdecore.so.4
#17 0xb773786a in KAction::updateKAccelShortcut () from /usr/lib/libkdeui.so.4
#18 0xb7737bd6 in KAction::insertKAccel () from /usr/lib/libkdeui.so.4
#19 0xb7737d2c in KAction::plugShortcut () from /usr/lib/libkdeui.so.4
#20 0xb7737d71 in KAction::plug () from /usr/lib/libkdeui.so.4
#21 0xb7738e3b in KToolBarPopupAction::plug () from /usr/lib/libkdeui.so.4
#22 0xb7685365 in KXMLGUI::BuildHelper::processActionElement ()
from /usr/lib/libkdeui.so.4
#23 0xb77163bb in KXMLGUI::BuildHelper::processActionOrCustomElement ()
from /usr/lib/libkdeui.so.4
#24 0xb77971f5 in KXMLGUI::BuildHelper::processElement ()
from /usr/lib/libkdeui.so.4
#25 0xb7797481 in KXMLGUI::BuildHelper::build () from /usr/lib/libkdeui.so.4
#26 0xb7796cf0 in KXMLGUI::BuildHelper::processContainerElement ()
from /usr/lib/libkdeui.so.4
#27 0xb77973a4 in KXMLGUI::BuildHelper::processElement ()
from /usr/lib/libkdeui.so.4
#28 0xb7797481 in KXMLGUI::BuildHelper::build () from /usr/lib/libkdeui.so.4
#29 0xb779785c in KXMLGUIFactory::addClient () from /usr/lib/libkdeui.so.4
#30 0xb7c0c6e8 in KonqPopupMenu::setup () from /usr/lib/libkonq.so.4
#31 0xb7c0fca5 in KonqPopupMenu::init () from /usr/lib/libkonq.so.4
#32 0xb7c0fe64 in KonqPopupMenu::KonqPopupMenu () from /usr/lib/libkonq.so.4
#33 0xb7ee0758 in KonqMainWindow::slotPopupMenu ()
from /usr/lib/libkdeinit_konqueror.so
#34 0xb7ee180d in KonqMainWindow::slotPopupMenu ()
from /usr/lib/libkdeinit_konqueror.so
#35 0xb7f1aa9d in KonqMainWindow::qt_invoke ()
from /usr/lib/libkdeinit_konqueror.so
#36 0xb6dd9d52 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#37 0xb7b35fa9 in KParts::BrowserExtension::popupMenu ()
from /usr/lib/libkparts.so.2
#38 0xb636ab86 in KHTMLPart::popupMenu () from /usr/lib/libkhtml.so.4
#39 0xb636c493 in KHTMLPart::khtmlMousePressEvent ()
from /usr/lib/libkhtml.so.4
#40 0xb631d6d1 in KHTMLPart::customEvent () from /usr/lib/libkhtml.so.4
#41 0xb6dd9ba9 in QObject::event () from /usr/lib/libqt-mt.so.3
#42 0xb6d80453 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#43 0xb6d80c7c in QApplication::notify () from /usr/lib/libqt-mt.so.3
#44 0xb7466ae7 in KApplication::notify () from /usr/lib/libkdecore.so.4
#45 0xb6331491 in KHTMLView::viewportMousePressEvent ()
from /usr/lib/libkhtml.so.4
#46 0xb6edf9f8 in QScrollView::eventFilter () from /usr/lib/libqt-mt.so.3
#47 0xb63267ea in KHTMLView::eventFilter () from /usr/lib/libkhtml.so.4
#48 0xb6dd9adc in QObject::activate_filters () from /usr/lib/libqt-mt.so.3
#49 0xb6dd9b3f in QObject::event () from /usr/lib/libqt-mt.so.3
#50 0xb6e0f6ce in QWidget::event () from /usr/lib/libqt-mt.so.3
#51 0xb6d80453 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#52 0xb6d81433 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#53 0xb7466ae7 in KApplication::notify () from /usr/lib/libkdecore.so.4
#54 0xb6d1e7d1 in QETWidget::translateMouseEvent ()
from /usr/lib/libqt-mt.so.3
#55 0xb6d1dda0 in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3
#56 0xb6d30264 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#57 0xb6d95bf2 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#58 0xb6d95b16 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#59 0xb6d7fea1 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#60 0xb7f14f79 in kdemain () from /usr/lib/libkdeinit_konqueror.so
#61 0xb7c42ea2 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
The following backtrace happened when opening a local pdf file (embedded) while
browsing my local file system.
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
`system-supplied DSO at 0xffffe000' has disappeared; keeping its symbols.
[Thread debugging using libthread_db enabled]
[New Thread -1231530304 (LWP 13591)]
[KCrash handler]
#4 0xb7351ea4 in pthread_mutex_lock ()
from /lib/tls/i686/cmov/libpthread.so.0
#5 0xb7d72cbe in pthread_mutex_lock () from /lib/tls/i686/cmov/libc.so.6
#6 0xb6b1ec4c in XUnlockDisplay () from /usr/lib/libX11.so.6
#7 0xb6b3c141 in XrmQGetResource () from /usr/lib/libX11.so.6
#8 0xb6b2cd19 in XStringToKeysym () from /usr/lib/libX11.so.6
#9 0xb7456e84 in KKeyServer::Sym::init () from /usr/lib/libkdecore.so.4
#10 0xb7472f18 in KKey::init () from /usr/lib/libkdecore.so.4
#11 0xb7472f9a in KKey::KKey () from /usr/lib/libkdecore.so.4
#12 0xb7473100 in KKeySequence::init () from /usr/lib/libkdecore.so.4
#13 0xb74732a7 in KShortcut::init () from /usr/lib/libkdecore.so.4
#14 0xb747371c in KShortcut::KShortcut () from /usr/lib/libkdecore.so.4
#15 0xb5612d1d in KPDF::Part::Part () from /usr/lib/kde3/libkpdfpart.so
#16 0xb5617a60 in KParts::GenericFactory<KPDF::Part>::createPartObject ()
from /usr/lib/kde3/libkpdfpart.so
#17 0xb7ba13b3 in KParts::Factory::createPart () from /usr/lib/libkparts.so.2
#18 0xb7f363a7 in KonqViewFactory::create ()
from /usr/lib/libkdeinit_konqueror.so
#19 0xb7f62027 in KonqFrame::attach () from /usr/lib/libkdeinit_konqueror.so
#20 0xb7f6215d in KonqView::switchView ()
from /usr/lib/libkdeinit_konqueror.so
#21 0xb7f6ce74 in KonqView::changeViewMode ()
from /usr/lib/libkdeinit_konqueror.so
#22 0xb7f7230c in KonqMainWindow::openView ()
from /usr/lib/libkdeinit_konqueror.so
#23 0xb7f73c2b in KonqMainWindow::openURL ()
from /usr/lib/libkdeinit_konqueror.so
#24 0xb7f76698 in KonqMainWindow::openURL ()
from /usr/lib/libkdeinit_konqueror.so
#25 0xb7f87670 in KonqMainWindow::slotOpenURLRequest ()
from /usr/lib/libkdeinit_konqueror.so
#26 0xb7f89b93 in KonqMainWindow::qt_invoke ()
from /usr/lib/libkdeinit_konqueror.so
#27 0xb6e48d52 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#28 0xb7ba468d in KParts::BrowserExtension::openURLRequestDelayed ()
from /usr/lib/libkparts.so.2
#29 0xb7bb1105 in KParts::BrowserExtension::slotEmitOpenURLRequestDelayed ()
from /usr/lib/libkparts.so.2
#30 0xb7bb1278 in KParts::BrowserExtension::qt_invoke ()
from /usr/lib/libkparts.so.2
#31 0xb57b8a77 in IconViewBrowserExtension::qt_invoke ()
from /usr/lib/kde3/konq_iconview.so
#32 0xb6e48d52 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#33 0xb71588dc in QSignal::signal () from /usr/lib/libqt-mt.so.3
#34 0xb6e63999 in QSignal::activate () from /usr/lib/libqt-mt.so.3
#35 0xb6e6a959 in QSingleShotTimer::event () from /usr/lib/libqt-mt.so.3
#36 0xb6def453 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#37 0xb6defc7c in QApplication::notify () from /usr/lib/libqt-mt.so.3
#38 0xb74d5ae7 in KApplication::notify () from /usr/lib/libkdecore.so.4
#39 0xb6de5013 in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#40 0xb6d9f5d8 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#41 0xb6e04bf2 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#42 0xb6e04b16 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#43 0xb6deeea1 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#44 0xb7f83f79 in kdemain () from /usr/lib/libkdeinit_konqueror.so
#45 0xb7cb1ea2 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
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