[okular] [Bug 416233] New: On AMD Ryzen 9 3900X, Okular segfaults at undo branching points.

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=416233

            Bug ID: 416233
           Summary: On AMD Ryzen 9 3900X, Okular segfaults at undo
                    branching points.
           Product: okular
           Version: 1.7.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: tomtomjhj at gmail.com
  Target Milestone: ---

SUMMARY
On AMD Ryzen 9 3900X, Okular segfaults at undo branching points.

STEPS TO REPRODUCE
1. Open a pdf file
2. Select an annotation tool e.g. inline note.
3. Make an inline note.
4. Make another inline note.
5. Undo 4. (Ctrl-z)
6. Make another inline note.

OBSERVED RESULT
Segmentation fault

I couldn't build okular on my machine so I don't have the full stack trace.

Thread 1 "okular" received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in  ()
#1  0x00007ffff041a8df in  () at
/usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#2  0x00007ffff0420cd9 in  () at
/usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#3  0x00007ffff0420da0 in  () at
/usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#4  0x00007ffff0411d67 in  () at
/usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#5  0x00007ffff68105c8 in QMetaObject::activate(QObject*, int, int, void**) ()
at /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007ffff044196e in  () at
/usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#7  0x00007ffff0441d06 in  () at
/usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#8  0x00007ffff0412724 in  () at
/usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#9  0x00007ffff04129e4 in  () at
/usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#10 0x00007ffff0437ebc in  () at
/usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#11 0x00007ffff72d504e in QWidget::event(QEvent*) () at
/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007ffff7382782 in QFrame::event(QEvent*) () at
/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007ffff043a9e9 in  () at
/usr/lib/x86_64-linux-gnu/qt5/plugins/okularpart.so
#14 0x00007ffff67e47ab in
QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () at
/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007ffff7292a75 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007ffff729c053 in QApplication::notify(QObject*, QEvent*) () at
/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007ffff67e4a9a in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() at /lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007ffff729b157 in QApplicationPrivate::sendMouseEvent(QWidget*,
QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) ()
at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007ffff72f114d in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#20 0x00007ffff72f3fdc in  () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007ffff7292a86 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007ffff729be00 in QApplication::notify(QObject*, QEvent*) () at
/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007ffff67e4a9a in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() at /lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007ffff6c68d73 in
QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*)
() at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#25 0x00007ffff6c6a5fb in
QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)
() at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#26 0x00007ffff6c4426b in
QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
() at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#27 0x00007ffff29c828e in  () at /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#28 0x00007ffff4fe584d in g_main_context_dispatch () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007ffff4fe5ad0 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007ffff4fe5b73 in g_main_context_iteration () at
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007ffff683c6a5 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
at /lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007ffff67e363b in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at
/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007ffff67eb3a6 in QCoreApplication::exec() () at
/lib/x86_64-linux-gnu/libQt5Core.so.5
#34 0x0000555555562c6a in  ()
#35 0x00007ffff61a51e3 in __libc_start_main (main=0x555555562560, argc=2,
argv=0x7fffffffd6d8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fffffffd6c8)
    at ../csu/libc-start.c:308
#36 0x00005555555642be in _start ()

SOFTWARE/OS VERSIONS
AMD Ryzen 9 3900X
Ubuntu 19.10, https://packages.ubuntu.com/eoan/okular

NOTES
* I think something wrong happens when the undo history creates a new branch.
* I couldn't reproduce this bug on my laptop with Intel i7-8550U and another
desktop with AMD Ryzen 5 3400G.

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