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  1. Qt Creator
  2. QTCREATORBUG-25312

Crash in ClassView

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    • 8fad758f6038875f5219c79fd35e937956e4c890 (qt-creator/qt-creator/4.15)

    Description

      To reproduce (more than 50% chances):

      1. Prepare 2 different sessions containing creator project.
      2. Load one of them.
      3. Wait until "Parsing C/C++ Files" gets finished and open class view and expand some items there.
      4. Switch the session to the second creator. Repeat the step 3 there.
      5. Switch the session back. Now start observing the "Parsing C/C++ Files" progress. Prepare to the next session switch by opening "File | Session" menu and put your finger on the mouse button but don't press it yet - wait for the proper time. Be ready to trigger session switch at the right point in time.
      6. Just after the "Parsing C/C++ Files" finished and got green, quickly trigger the session switch. The time frame window is quite narrow, about 1 second, so be prepared. The thing is that session switch should happen at the time when Class View starts parsing the project tree. This parsing lasts for max 1 second, so you should fit into this frame.
      7. If you were unlucky, repeat steps 5 and 6 until you crash.

      The stack trace from the crash looks like:

      Thread 1 (Thread 0x7fb61bfff640 (LWP 20759)):
#0  0x00007fb65d6aba70 in QIcon::isNull (this=0x60) at /home/jarek/dev/qt-515/qtbase/src/gui/image/qicon.cpp:993
#1  0x00007fb64115fdf4 in ProjectExplorer::FolderNode::icon (this=0x0) at /home/jarek/dev/creator-master/src/plugins/projectexplorer/projectnodes.cpp:491
#2  0x00007fb634a928d6 in ClassView::Internal::Parser::parse (this=0x1f1ef68) at /home/jarek/dev/creator-master/src/plugins/classview/classviewparser.cpp:309
#3  0x00007fb634a94314 in ClassView::Internal::Parser::emitCurrentTree (this=0x1f1ef68) at /home/jarek/dev/creator-master/src/plugins/classview/classviewparser.cpp:700
#4  0x00007fb634a942ac in ClassView::Internal::Parser::onResetDataDone (this=0x1f1ef68) at /home/jarek/dev/creator-master/src/plugins/classview/classviewparser.cpp:678
#5  0x00007fb634a8ebd4 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (ClassView::Internal::Parser::*)()>::call(void (ClassView::Internal::Parser::*)(), ClassView::Internal::Parser*, void**) (f=(void (ClassView::Internal::Parser::*)(ClassView::Internal::Parser * const)) 0x7fb634a94294 <ClassView::Internal::Parser::onResetDataDone()>, o=0x1f1ef68, arg=0x328d1f8) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qobjectdefs_impl.h:152
#6  0x00007fb634a8e70d in QtPrivate::FunctionPointer<void (ClassView::Internal::Parser::*)()>::call<QtPrivate::List<>, void>(void (ClassView::Internal::Parser::*)(), ClassView::Internal::Parser*, void**) (f=(void (ClassView::Internal::Parser::*)(ClassView::Internal::Parser * const)) 0x7fb634a94294 <ClassView::Internal::Parser::onResetDataDone()>, o=0x1f1ef68, arg=0x328d1f8) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qobjectdefs_impl.h:185
#7  0x00007fb634a8e187 in QtPrivate::QSlotObject<void (ClassView::Internal::Parser::*)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (which=1, this_=0x1f241b0, r=0x1f1ef68, a=0x328d1f8, ret=0x0) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qobjectdefs_impl.h:418
#8  0x00007fb65ce76d3f in QtPrivate::QSlotObjectBase::call (this=0x1f241b0, r=0x1f1ef68, a=0x328d1f8) at ../../include/QtCore/../../../../qt-515/qtbase/src/corelib/kernel/qobjectdefs_impl.h:398
#9  0x00007fb65cea7ea7 in QMetaCallEvent::placeMetaCall (this=0x328d1b0, object=0x1f1ef68) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qobject.cpp:615
#10 0x00007fb65cea8d14 in QObject::event (this=0x1f1ef68, e=0x328d1b0) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qobject.cpp:1314
#11 0x00007fb65df68859 in QApplicationPrivate::notify_helper (this=0x11bc480, receiver=0x1f1ef68, e=0x328d1b0) at /home/jarek/dev/qt-515/qtbase/src/widgets/kernel/qapplication.cpp:3632
#12 0x00007fb65df65d0f in QApplication::notify (this=0x7ffed5a480d0, receiver=0x1f1ef68, e=0x328d1b0) at /home/jarek/dev/qt-515/qtbase/src/widgets/kernel/qapplication.cpp:2972
#13 0x00007fb65ce65b68 in QCoreApplication::notifyInternal2 (receiver=0x1f1ef68, event=0x328d1b0) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qcoreapplication.cpp:1064
#14 0x00007fb65ce66500 in QCoreApplication::sendEvent (receiver=0x1f1ef68, event=0x328d1b0) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qcoreapplication.cpp:1462
#15 0x00007fb65ce671e8 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x1f1f030) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qcoreapplication.cpp:1821
#16 0x00007fb65ce66b7a in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qcoreapplication.cpp:1680
#17 0x00007fb65cef4127 in postEventSourceDispatch (s=0x7fb61c000e30) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:277
#18 0x00007fb659b0396f in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#19 0x00007fb659b55758 in g_main_context_iterate.constprop () from /lib64/libglib-2.0.so.0
#20 0x00007fb659b00d43 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#21 0x00007fb65cef4850 in QEventDispatcherGlib::processEvents (this=0x7fb61c005250, flags=...) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:423
#22 0x00007fb65ce6263f in QEventLoop::processEvents (this=0x7fb61bffebe0, flags=...) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qeventloop.cpp:139
#23 0x00007fb65ce6294c in QEventLoop::exec (this=0x7fb61bffebe0, flags=...) at /home/jarek/dev/qt-515/qtbase/src/corelib/kernel/qeventloop.cpp:232
#24 0x00007fb65cbfa52f in QThread::exec (this=0x1f1ef80) at /home/jarek/dev/qt-515/qtbase/src/corelib/thread/qthread.cpp:547
#25 0x00007fb65cbfa6c2 in QThread::run (this=0x1f1ef80) at /home/jarek/dev/qt-515/qtbase/src/corelib/thread/qthread.cpp:616
#26 0x00007fb65cbfd30e in QThreadPrivate::start (arg=0x1f1ef80) at /home/jarek/dev/qt-515/qtbase/src/corelib/thread/qthread_unix.cpp:329
#27 0x00007fb65be953f9 in start_thread () from /lib64/libpthread.so.0
#28 0x00007fb65c701903 in clone () from /lib64/libc.so.6

      Most probably the reason is that inside ParserTreeItem::ConstPtr Parser::parse() function, which is called from non-gui thread, we are calling SessionManager::projects(), which is not guaranteed to be thread safe. When we operate on the project inside the loop, it may happen, that after a call to SessionManager::projects(), the returned projects already get deleted by the main thread (because of session switch), while we are still taking data out of them (like prj->containerNode()->icon(), which is called after the project gets parsed).

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          Bug - A problem which impairs or prevents the functions of the product. QTCREATORBUG-25301 Creator uses QIcons in non-gui threads

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
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              jkobus Jarek Kobus
              jkobus Jarek Kobus
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