Bug 356120

Summary:	Crash when hovering or selecting any .h file
Product:	[Applications] dolphin	Reporter:	obnosim
Component:	general	Assignee:	Dolphin Bug Assignee <dolphin-bugs-null>
Status:	RESOLVED FIXED
Severity:	crash	CC:	frank78ac, mail
Priority:	NOR	Keywords:	drkonqi
Version:	15.08.2
Target Milestone:	---
Platform:	openSUSE
OS:	Linux
See Also:	https://bugs.kde.org/show_bug.cgi?id=349295
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	Valgrind backtrace Old ~/.local/share/mime folder which caused the problem

Description obnosim 2015-11-30 16:12:42 UTC

Application: dolphin (15.08.2)

Qt Version: 5.5.0
Operating System: Linux 4.1.12-1-default x86_64
Distribution: "openSUSE Leap 42.1 (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed:

Dolphin crashes every time my cursor moves over a file with an extension of .h or every time I select one using the arrow keys.
I have not seen that happen with any other mimetype.
It happens whether or not the Informations panel is present in the interface.

The crash can be reproduced every time.

-- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fab1ab757c0 (LWP 8126))]

Thread 3 (Thread 0x7fab03d55700 (LWP 8127)):
#0  0x00007fab1a41ec1d in poll () at /lib64/libc.so.6
#1  0x00007fab0d67b422 in  () at /usr/lib64/libxcb.so.1
#2  0x00007fab0d67d00f in xcb_wait_for_event () at /usr/lib64/libxcb.so.1
#3  0x00007fab060a9c29 in  () at /usr/lib64/libQt5XcbQpa.so.5
#4  0x00007fab1477655f in  () at /usr/lib64/libQt5Core.so.5
#5  0x00007fab101170a4 in start_thread () at /lib64/libpthread.so.0
#6  0x00007fab1a42704d in clone () at /lib64/libc.so.6

Thread 2 (Thread 0x7faaf8548700 (LWP 8128)):
#0  0x00007fab1a41ec1d in poll () at /lib64/libc.so.6
#1  0x00007fab0f9e3e64 in  () at /usr/lib64/libglib-2.0.so.0
#2  0x00007fab0f9e3f7c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#3  0x00007fab149a7a5b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#4  0x00007fab1494ea63 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#5  0x00007fab1477184a in QThread::exec() () at /usr/lib64/libQt5Core.so.5
#6  0x00007fab1477655f in  () at /usr/lib64/libQt5Core.so.5
#7  0x00007fab101170a4 in start_thread () at /lib64/libpthread.so.0
#8  0x00007fab1a42704d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7fab1ab757c0 (LWP 8126)):
[KCrash Handler]
#6  0x00007fab14807518 in operator==(QString const&, QString const&) () at /usr/lib64/libQt5Core.so.5
#7  0x00007fab149e0ddd in  () at /usr/lib64/libQt5Core.so.5
#8  0x00007fab149d3df8 in QMimeType::comment() const () at /usr/lib64/libQt5Core.so.5
#9  0x00007fab1848b7d8 in KFileItem::mimeComment() const () at /usr/lib64/libKF5KIOCore.so.5
#10 0x00007fab1848bd09 in KFileItem::getStatusBarInfo() const () at /usr/lib64/libKF5KIOCore.so.5
#11 0x00007fab1a73ab15 in  () at /usr/lib64/libkdeinit5_dolphin.so
#12 0x00007fab1498040f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5
#13 0x00007fab1a103655 in DolphinView::requestItemInfo(KFileItem const&) () at /usr/lib64/libdolphinprivate.so.5
#14 0x00007fab1a0df716 in DolphinView::slotItemHovered(int) () at /usr/lib64/libdolphinprivate.so.5
#15 0x00007fab1498040f in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib64/libQt5Core.so.5
#16 0x00007fab1a1025b1 in KItemListController::itemHovered(int) () at /usr/lib64/libdolphinprivate.so.5
#17 0x00007fab1a0a6745 in KItemListController::hoverMoveEvent(QGraphicsSceneHoverEvent*, QTransform const&) () at /usr/lib64/libdolphinprivate.so.5
#18 0x00007fab1a0a3b5b in KItemListController::processEvent(QEvent*, QTransform const&) () at /usr/lib64/libdolphinprivate.so.5
#19 0x00007fab1a0b5622 in KItemListView::event(QEvent*) () at /usr/lib64/libdolphinprivate.so.5
#20 0x00007fab15ac5e8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#21 0x00007fab15acacd8 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#22 0x00007fab14950ba5 in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#23 0x00007fab15dd42dc in  () at /usr/lib64/libQt5Widgets.so.5
#24 0x00007fab15dd9ce0 in  () at /usr/lib64/libQt5Widgets.so.5
#25 0x00007fab15dda117 in  () at /usr/lib64/libQt5Widgets.so.5
#26 0x00007fab15dda50b in QGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent*) () at /usr/lib64/libQt5Widgets.so.5
#27 0x00007fab15de6ea4 in QGraphicsScene::event(QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#28 0x00007fab15ac5e8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#29 0x00007fab15acacd8 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#30 0x00007fab14950ba5 in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#31 0x00007fab15dff2a6 in QGraphicsViewPrivate::mouseMoveEventHandler(QMouseEvent*) () at /usr/lib64/libQt5Widgets.so.5
#32 0x00007fab15b05fe8 in QWidget::event(QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#33 0x00007fab15c004de in QFrame::event(QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#34 0x00007fab15e02683 in QGraphicsView::viewportEvent(QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#35 0x00007fab14950de3 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#36 0x00007fab15ac5e6c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#37 0x00007fab15acb2db in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#38 0x00007fab14950ba5 in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#39 0x00007fab15aca1a1 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /usr/lib64/libQt5Widgets.so.5
#40 0x00007fab15b1f25b in  () at /usr/lib64/libQt5Widgets.so.5
#41 0x00007fab15b21453 in  () at /usr/lib64/libQt5Widgets.so.5
#42 0x00007fab15ac5e8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#43 0x00007fab15acacd8 in QApplication::notify(QObject*, QEvent*) () at /usr/lib64/libQt5Widgets.so.5
#44 0x00007fab14950ba5 in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /usr/lib64/libQt5Core.so.5
#45 0x00007fab153323b4 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /usr/lib64/libQt5Gui.so.5
#46 0x00007fab15333bc5 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib64/libQt5Gui.so.5
#47 0x00007fab15318d68 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Gui.so.5
#48 0x00007fab060d4f20 in  () at /usr/lib64/libQt5XcbQpa.so.5
#49 0x00007fab0f9e3c84 in g_main_context_dispatch () at /usr/lib64/libglib-2.0.so.0
#50 0x00007fab0f9e3ed8 in  () at /usr/lib64/libglib-2.0.so.0
#51 0x00007fab0f9e3f7c in g_main_context_iteration () at /usr/lib64/libglib-2.0.so.0
#52 0x00007fab149a7a3c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#53 0x00007fab1494ea63 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/libQt5Core.so.5
#54 0x00007fab149565d6 in QCoreApplication::exec() () at /usr/lib64/libQt5Core.so.5
#55 0x00007fab1a749390 in kdemain () at /usr/lib64/libkdeinit5_dolphin.so
#56 0x00007fab1a363b05 in __libc_start_main () at /lib64/libc.so.6
#57 0x00000000004007ee in _start ()

Reported using DrKonqi

Comment 1 Frank Reininghaus 2015-12-01 19:46:51 UTC

Thanks for the bug report! Could you try to get a more detailed backtrace by installing debugging packages, and ideally, also a Valgrind log? See https://community.kde.org/Dolphin/FAQ/Crashes for details. Thanks for your help.

Comment 2 obnosim 2015-12-01 19:59:38 UTC

Created attachment 95849 [details]
Valgrind backtrace

Valgrind backtrace with debug package

Comment 3 Frank Reininghaus 2015-12-01 20:13:11 UTC

Thanks, but I'm afraid the log does not contain much useful information. It crashes while determining the mime type of the hovered file, so it could be a problem with QMimeDatabase.

Comment 4 obnosim 2015-12-16 19:03:51 UTC

Created attachment 96133 [details]
Old ~/.local/share/mime folder which caused the problem

It seems I have found the source of the crash. Renaming ~/.local/share/mime to mime.old instantly stopped all crashes. Here is an archive of the whole folder in case someone wants to further investigate.

Comment 5 Julian Steinmann 2018-02-12 16:27:56 UTC

Apparently this bug was caused by a corrupt ~/.local/share/mime folder, and such a case has not been reported again in the last two years. Chances are that this bug is very specific and/or does no longer exist. Can probably be closed.

Comment 6 Julian Steinmann 2018-02-14 16:23:49 UTC

If someone still experiences a crash when hovering over a .h file, feel free to re-open this bug. But because the chances for that are very low (old, was probably caused by corrupted cache) I'll close it for now.