Details
P1: Critical Description
Having Privoxy set as the proxy server in Falkon sometimes leads to a segmentation fault (or at least so far I have been unable to reproduce without a proxy server set).
I've not found a way to reproduce it 100% of the time, but going to the SQUARE ENIX Final Fantasy XI forums [1] and then middle-click opening 'インフォメーション' [2] in new tabs repeatedly will usually lead to the crash in less than 11 clicks (I think any link there should work, or simply navigating around the site; it does not need to be new tabs being opened).
(I've also had segfaults when closing tabs, but I don't have a way to reproduce it to even this extent yet.)
So far crashing like this can lead to at least two different backtraces:
Starting program: /usr/bin/falkon -p segfault [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". [New Thread 0x7fffe6daf700 (LWP 31515)] Falkon: Starting with profile 'segfault' [New Thread 0x7fffe4a0a700 (LWP 31516)] [Detaching after fork from child process 31517] [New Thread 0x7fffde28d700 (LWP 31518)] [New Thread 0x7fffdda8c700 (LWP 31519)] [New Thread 0x7fffdd28b700 (LWP 31520)] [New Thread 0x7fffdca8a700 (LWP 31521)] [New Thread 0x7fffcffff700 (LWP 31522)] [New Thread 0x7fffcf7fe700 (LWP 31523)] [New Thread 0x7fffceffd700 (LWP 31524)] [New Thread 0x7fffce7fc700 (LWP 31526)] [New Thread 0x7fffcdffb700 (LWP 31528)] [New Thread 0x7fffcd7fa700 (LWP 31529)] [New Thread 0x7fffccff9700 (LWP 31530)] [New Thread 0x7fffabfff700 (LWP 31532)] [New Thread 0x7fffab7fe700 (LWP 31534)] Use of deprecated not thread-safe setter, use setUrlRequestInterceptor instead. [New Thread 0x7fffaaffd700 (LWP 31535)] Falkon: 1 extensions loaded [New Thread 0x7fffaa7fc700 (LWP 31536)] [New Thread 0x7fffa9ffb700 (LWP 31537)] [New Thread 0x7fffa97fa700 (LWP 31538)] [New Thread 0x7fffa8ff9700 (LWP 31539)] [New Thread 0x7fff8bfff700 (LWP 31540)] [New Thread 0x7fff8b7fe700 (LWP 31541)] [Detaching after fork from child process 31542] [New Thread 0x7fff8affd700 (LWP 31543)] [New Thread 0x7fff89aa2700 (LWP 31569)] [New Thread 0x7fff88ea1700 (LWP 31600)] Thread 1 "falkon" received signal SIGSEGV, Segmentation fault. QtWebEngineCore::ProfileIODataQt::requestInterceptor (this=0x36332e3733352f) at /[...]/qtwebengine-5.15.9999/src/core/profile_io_data_qt.cpp:360 360 /[...]/qtwebengine-5.15.9999/src/core/profile_io_data_qt.cpp: No such file or directory. (gdb) bt #0 QtWebEngineCore::ProfileIODataQt::requestInterceptor (this=0x36332e3733352f) at /[...]/qtwebengine-5.15.9999/src/core/profile_io_data_qt.cpp:360 #1 0x00007fffefdf6c6e in QtWebEngineCore::InterceptedRequest::InterceptOnUIThread (this=0x7fffc8ccab50) at /[...]/qtwebengine-5.15.9999/src/core/net/proxying_url_loader_factory_qt.cpp:259 #2 0x00007fffefdf6731 in base::internal::FunctorTraits<void (QtWebEngineCore::InterceptedRequest::*)(), void>::Invoke<void (QtWebEngineCore::InterceptedRequest::*)(), QtWebEngineCore::InterceptedRequest*> (receiver_ptr=<optimized out>, method=<optimized out>) at ../../../../qtwebengine-5.15.9999/src/3rdparty/chromium/base/bind_internal.h:495 #3 base::internal::InvokeHelper<false, void>::MakeItSo<void (QtWebEngineCore::InterceptedRequest::*)(), QtWebEngineCore::InterceptedRequest*> (functor=<optimized out>) at ../../../../qtwebengine-5.15.9999/src/3rdparty/chromium/base/bind_internal.h:598 #4 base::internal::Invoker<base::internal::BindState<void (QtWebEngineCore::InterceptedRequest::*)(), base::internal::UnretainedWrapper<QtWebEngineCore::InterceptedRequest> >, void ()>::RunImpl<void (QtWebEngineCore::InterceptedRequest::*)(), std::tuple<base::internal::UnretainedWrapper<QtWebEngineCore::InterceptedRequest> >, 0ul>(void (QtWebEngineCore::InterceptedRequest::*&&)(), std::tuple<base::internal::UnretainedWrapper<QtWebEngineCore::InterceptedRequest> >&&, std::integer_sequence<unsigned long, 0ul>) (bound=..., functor=<optimized out>) at ../../../../qtwebengine-5.15.9999/src/3rdparty/chromium/base/bind_internal.h:672 #5 base::internal::Invoker<base::internal::BindState<void (QtWebEngineCore::InterceptedRequest::*)(), base::internal::UnretainedWrapper<QtWebEngineCore::InterceptedRequest> >, void ()>::RunOnce(base::internal::BindStateBase*) (base=<optimized out>) at ../../../../qtwebengine-5.15.9999/src/3rdparty/chromium/base/bind_internal.h:640 #6 0x00007ffff1c619a4 in base::TaskAnnotator::RunTask(char const*, base::PendingTask*) () from /usr/lib64/libQt5WebEngineCore.so.5 #7 0x00007ffff1c74357 in base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWorkImpl(base::sequence_manager::LazyNow*, bool*) () from /usr/lib64/libQt5WebEngineCore.so.5 #8 0x00007ffff1c7498b in base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWork() () from /usr/lib64/libQt5WebEngineCore.so.5 #9 0x00007fffefda5884 in QtWebEngineCore::MessagePumpForUIQt::handleScheduledWork (this=0x0) at /[...]/qtwebengine-5.15.9999/src/core/browser_main_parts_qt.cpp:202 #10 QtWebEngineCore::MessagePumpForUIQt::MessagePumpForUIQt()::{lambda()#1}::operator()() const (__closure=<optimized out>) at /[...]/qtwebengine-5.15.9999/src/core/browser_main_parts_qt.cpp:115 #11 std::_Function_handler<void (), QtWebEngineCore::MessagePumpForUIQt::MessagePumpForUIQt()::{lambda()#1}>::_M_invoke(std::_Any_data const&) (__functor=...) at /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/include/g++-v9/bits/std_function.h:300 #12 0x00007ffff5b19df7 in std::function<void ()>::operator()() const (this=0x555555a4d4c8) at /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/include/g++-v9/bits/std_function.h:685 #13 QWebEngineMessagePumpScheduler::timerEvent (this=0x555555a4d4b0, ev=<optimized out>) at /[...]/qtwebengine-5.15.9999/src/core/api/qwebenginemessagepumpscheduler.cpp:71 #14 0x00007ffff7297a23 in QObject::event (this=0x555555a4d4b0, e=0x55555979d030) at /[...]/qtcore-5.15.9999/src/corelib/kernel/qobject.cpp:1291 #15 0x00007ffff76825bd in QApplicationPrivate::notify_helper (this=this@entry=0x55555557b3d0, receiver=0x555555a4d4b0, receiver@entry=0x7fffffffce00, e=e@entry=0x55555979d030) at /[...]/qtwidgets-5.15.9999/src/widgets/kernel/qapplication.cpp:3673 #16 0x00007ffff768a570 in QApplication::notify (this=0x7fffffffd6f0, receiver=0x7fffffffce00, e=0x55555979d030) at /[...]/qtwidgets-5.15.9999/src/widgets/kernel/qapplication.cpp:3013 #17 0x00007ffff726d3a3 in QCoreApplication::notifyInternal2 (receiver=0x555555a4d4b0, event=0x55555979d030) at /[...]/qtcore-5.15.9999/src/corelib/kernel/qcoreapplication.cpp:1061 #18 0x00007ffff726d576 in QCoreApplication::sendEvent (receiver=receiver@entry=0x555555a4d4b0, event=event@entry=0x55555979d030) at /[...]/qtcore-5.15.9999/src/corelib/kernel/qcoreapplication.cpp:1456 #19 0x00007ffff727069c in QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x55555557b540) at /[...]/qtcore-5.15.9999/src/corelib/kernel/qcoreapplication.cpp:1815 #20 0x00007ffff7270b33 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at /[...]/qtcore-5.15.9999/src/corelib/kernel/qcoreapplication.cpp:1674 #21 0x00007ffff72c3c2b in postEventSourceDispatch (s=0x5555555d3c90) at /[...]/qtcore-5.15.9999/src/corelib/kernel/qeventdispatcher_glib.cpp:277 #22 0x00007fffee0fdc6e in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0 #23 0x00007fffee0fdf08 in ?? () from /usr/lib64/libglib-2.0.so.0 #24 0x00007fffee0fdf9f in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0 #25 0x00007ffff72c39ce in QEventDispatcherGlib::processEvents (this=0x55555557f9f0, flags=...) at /[...]/qtcore-5.15.9999/src/corelib/kernel/qeventdispatcher_glib.cpp:423 #26 0x00007fffe6fb6d6c in QXcbGlibEventDispatcher::processEvents (this=<optimized out>, flags=...) at /[...]/qtgui-5.15.9999/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:143 #27 0x00007ffff726bbbf in QEventLoop::processEvents (this=this@entry=0x7fffffffd650, flags=..., flags@entry=...) at /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/include/g++-v9/bits/atomic_base.h:734 #28 0x00007ffff726c056 in QEventLoop::exec (this=this@entry=0x7fffffffd650, flags=..., flags@entry=...) at ../../include/QtCore/../../../qtcore-5.15.9999/src/corelib/global/qflags.h:141 #29 0x00007ffff72748e7 in QCoreApplication::exec () at ../../include/QtCore/../../../qtcore-5.15.9999/src/corelib/global/qflags.h:121 #30 0x00007fffee95d4a8 in QGuiApplication::exec () at /[...]/qtgui-5.15.9999/src/gui/kernel/qguiapplication.cpp:1864 #31 0x00007ffff768252b in QApplication::exec () at /[...]/qtwidgets-5.15.9999/src/widgets/kernel/qapplication.cpp:2813 #32 0x0000555555556941 in main (argc=<optimized out>, argv=<optimized out>)
Second one:
Starting program: /usr/bin/falkon -p segfault [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib64/libthread_db.so.1". [New Thread 0x7fffe6daf700 (LWP 5323)] Falkon: Starting with profile 'segfault' [New Thread 0x7fffe4a05700 (LWP 5373)] [Detaching after fork from child process 5375] [New Thread 0x7fffde28d700 (LWP 5379)] [New Thread 0x7fffdda8c700 (LWP 5384)] [New Thread 0x7fffdd28b700 (LWP 5386)] [New Thread 0x7fffdca8a700 (LWP 5387)] [New Thread 0x7fffcffff700 (LWP 5389)] [New Thread 0x7fffcf7fe700 (LWP 5393)] [New Thread 0x7fffce7fc700 (LWP 5395)] [New Thread 0x7fffceffd700 (LWP 5394)] [New Thread 0x7fffcd7fa700 (LWP 5398)] [New Thread 0x7fffccff9700 (LWP 5399)] [New Thread 0x7fffb7fff700 (LWP 5400)] [New Thread 0x7fffcdffb700 (LWP 5397)] [New Thread 0x7fffb77fe700 (LWP 5401)] [New Thread 0x7fffb6ffd700 (LWP 5402)] [New Thread 0x7fffb67fc700 (LWP 5435)] [New Thread 0x7fffb5ffb700 (LWP 5443)] Use of deprecated not thread-safe setter, use setUrlRequestInterceptor instead. Falkon: 1 extensions loaded [New Thread 0x7fffb57fa700 (LWP 5484)] [New Thread 0x7fffb4ff9700 (LWP 5486)] [New Thread 0x7fff8bfff700 (LWP 5487)] [New Thread 0x7fff8b7fe700 (LWP 5488)] [New Thread 0x7fff8affd700 (LWP 5490)] [New Thread 0x7fff8a7fc700 (LWP 5491)] [New Thread 0x7fff89ffb700 (LWP 5493)] [New Thread 0x7fff897fa700 (LWP 5499)] [Detaching after fork from child process 5501] [New Thread 0x7fff88ff9700 (LWP 5502)] [New Thread 0x7fff6b752700 (LWP 5532)] [New Thread 0x7fff6af51700 (LWP 5925)] [Thread 0x7fffcdffb700 (LWP 5397) exited] [Thread 0x7fffce7fc700 (LWP 5395) exited] [Thread 0x7fffccff9700 (LWP 5399) exited] [Thread 0x7fffcd7fa700 (LWP 5398) exited] [New Thread 0x7fffcd7fa700 (LWP 6693)] Thread 6 "Chrome_IOThread" received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fffdd28b700 (LWP 5386)] QWebEngineUrlRequestInfo::changed (this=this@entry=0xb38) at /usr/include/qt5/QtCore/qscopedpointer.h:116 warning: Source file is more recent than executable. 116 T *operator->() const noexcept (gdb) bt #0 QWebEngineUrlRequestInfo::changed (this=this@entry=0xb38) at /usr/include/qt5/QtCore/qscopedpointer.h:116 #1 0x00007fffefdf9e0f in QtWebEngineCore::InterceptedRequest::ContinueAfterIntercept (this=0x50) at /[...]/qtwebengine-5.15.9999/src/core/net/proxying_url_loader_factory_qt.cpp:278 #2 0x00007fffefdf681c in base::internal::FunctorTraits<void (QtWebEngineCore::InterceptedRequest::*)(), void>::Invoke<void (QtWebEngineCore::InterceptedRequest::*)(), base::WeakPtr<QtWebEngineCore::InterceptedRequest>>(void (QtWebEngineCore::InterceptedRequest::*)(), base::WeakPtr<QtWebEngineCore::InterceptedRequest>&&) (receiver_ptr=..., method=<optimized out>) at ../../../../qtwebengine-5.15.9999/src/3rdparty/chromium/base/memory/weak_ptr.h:254 #3 base::internal::InvokeHelper<true, void>::MakeItSo<void (QtWebEngineCore::InterceptedRequest::*)(), base::WeakPtr<QtWebEngineCore::InterceptedRequest>>(void (QtWebEngineCore::InterceptedRequest::*&&)(), base::WeakPtr<QtWebEngineCore::InterceptedRequest>&&) ( weak_ptr=..., functor=@0x555558e954f0: (void (QtWebEngineCore::InterceptedRequest::*)(QtWebEngineCore::InterceptedRequest * const)) 0x7fffefdf9dda <QtWebEngineCore::InterceptedRequest::ContinueAfterIntercept()>) at ../../../../qtwebengine-5.15.9999/src/3rdparty/chromium/base/bind_internal.h:618 #4 base::internal::Invoker<base::internal::BindState<void (QtWebEngineCore::InterceptedRequest::*)(), base::WeakPtr<QtWebEngineCore::InterceptedRequest> >, void ()>::RunImpl<void (QtWebEngineCore::InterceptedRequest::*)(), std::tuple<base::WeakPtr<QtWebEngineCore::InterceptedRequest> >, 0ul>(void (QtWebEngineCore::InterceptedRequest::*&&)(), std::tuple<base::WeakPtr<QtWebEngineCore::InterceptedRequest> >&&, std::integer_sequence<unsigned long, 0ul>) (bound=..., functor=@0x555558e954f0: (void (QtWebEngineCore::InterceptedRequest::*)(QtWebEngineCore::InterceptedRequest * const)) 0x7fffefdf9dda <QtWebEngineCore::InterceptedRequest::ContinueAfterIntercept()>) at ../../../../qtwebengine-5.15.9999/src/3rdparty/chromium/base/bind_internal.h:672 #5 base::internal::Invoker<base::internal::BindState<void (QtWebEngineCore::InterceptedRequest::*)(), base::WeakPtr<QtWebEngineCore::InterceptedRequest> >, void ()>::RunOnce(base::internal::BindStateBase*) (base=0x555558e954d0) at ../../../../qtwebengine-5.15.9999/src/3rdparty/chromium/base/bind_internal.h:640 #6 0x00007ffff1c619a4 in base::TaskAnnotator::RunTask(char const*, base::PendingTask*) () from /usr/lib64/libQt5WebEngineCore.so.5 #7 0x00007ffff1c74357 in base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoWorkImpl(base::sequence_manager::LazyNow*, bool*) () from /usr/lib64/libQt5WebEngineCore.so.5 #8 0x00007ffff1c7481c in base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::DoSomeWork() () from /usr/lib64/libQt5WebEngineCore.so.5 #9 0x00007ffff1cc43c6 in base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) () from /usr/lib64/libQt5WebEngineCore.so.5 #10 0x00007ffff1c646e8 in base::sequence_manager::internal::ThreadControllerWithMessagePumpImpl::Run(bool, base::TimeDelta) () from /usr/lib64/libQt5WebEngineCore.so.5 #11 0x00007ffff1c520fa in base::RunLoop::Run() () from /usr/lib64/libQt5WebEngineCore.so.5 #12 0x0000000000000000 in ?? ()
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