https://bugs.kde.org/show_bug.cgi?id=444516

--- Comment #32 from David REVOY <i...@davidrevoy.com> ---
I just had another crash with ASAN, but with a much shorter output, I'll paste
it here directly:

This one was obtained while 'airbrushing' an area to silhouette a character.

 ~/sources/krita »»» ./krita-5.1.0-prealpha-4807d9c-ASAN-x86_64.appimage
KoColor debug runtime checks are active.
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
krita.general: convertAndSetBlendMode: Curve conversion is not implemented yet
QObject::startTimer: Timers cannot have negative intervals
/tmp/.mount_krita-w7SaLX/usr/lib/krita-python-libs/krita added to PYTHONPATH
QLayout: Attempting to add QLayout "" to QWidget "", which already has a layout
QLayout: Attempting to add QLayout "" to QWidget "", which already has a layout
Shortcut for action  "isolate_active_layer" "&Isolate Active Layer" set with
QAction::setShortcut()! Use KActionCollection::setDefaultShortcut(s) instead.
WARNING: KisResourceLocator::loadRequiredResources failed to sanity check the
embedded resource:
         parent resource: KoResourceSignature("paintoppresets", "",
"f)_Soft_Rounded_Slightly_Textured.kpp", "f) Soft Rounded Slightly Textured")
         embedded resource: KoResourceSignature("patterns",
"60d910f9257210a55a5923ff11755d21",
"4-paper-soft-grain_testdark-black55.png.pat",
"4-paper-soft-grain_testdark-black55.png")
Still unsignalled after processed 17 tiles
    increased number of buffers to 32
Still unsignalled after processed 33 tiles
    increased number of buffers to 64
Still unsignalled after processed 65 tiles
    increased number of buffers to 128
SAFE ASSERT (krita): "m_deselectedMask->active()" in file
/home/appimage/persistent/krita/libs/image/commands/KisDeselectActiveSelectionCommand.cpp,
line 35
AddressSanitizer:DEADLYSIGNAL
=================================================================
==9201==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc
0x7f4aaed03fe7 bp 0x7f4aafccbdc0 sp 0x7ffca9295c10 T0)
==9201==The signal is caused by a READ memory access.
==9201==Hint: address points to the zero page.
    #0 0x7f4aaed03fe6 in QMetaObject::cast(QObject const*) const
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Core.so.5+0x290fe6)
    #1 0x7f4aaf93eba8 in QMdiArea::eventFilter(QObject*, QEvent*)
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Widgets.so.5+0x2c2ba8)
    #2 0x7f4aaecfa0ec in
QCoreApplicationPrivate::sendThroughApplicationEventFilters(QObject*, QEvent*)
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Core.so.5+0x2870ec)
    #3 0x7f4aaf7de917 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Widgets.so.5+0x162917)
    #4 0x7f4aaf7e5f1f in QApplication::notify(QObject*, QEvent*)
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Widgets.so.5+0x169f1f)
    #5 0x7f4abc4db8c0 in KisApplication::notify(QObject*, QEvent*)
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libkritaui.so.18+0x1a148c0)
    #6 0x7f4aaecfa4a7 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Core.so.5+0x2874a7)
    #7 0x7f4aaecfd159 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*)
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Core.so.5+0x28a159)
    #8 0x7f4aaed541e2 
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Core.so.5+0x2e11e2)
    #9 0x7f4aac56517c in g_main_context_dispatch
(/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5217c)
    #10 0x7f4aac5653ff  (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x523ff)
    #11 0x7f4aac5654a2 in g_main_context_iteration
(/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x524a2)
    #12 0x7f4aaed537ce in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Core.so.5+0x2e07ce)
    #13 0x7f4aaecf8a39 in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Core.so.5+0x285a39)
    #14 0x7f4aaed017b3 in QCoreApplication::exec()
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Core.so.5+0x28e7b3)
    #15 0x41178f in main /home/appimage/persistent/krita/krita/main.cc:694
    #16 0x7f4aae5370b2 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #17 0x4148e8 in _start (/tmp/.mount_krita-w7SaLX/usr/bin/krita+0x4148e8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV
(/tmp/.mount_krita-w7SaLX/usr/bin/../lib/libQt5Core.so.5+0x290fe6) in
QMetaObject::cast(QObject const*) const
==9201==ABORTING
 ~/sources/krita »»»

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