Bug 406032

Summary: krita crashed after tool selection "smart patch"
Product: [Applications] krita Reporter: anton <ontafan>
Component: GeneralAssignee: Krita Bugs <krita-bugs-null>
Status: RESOLVED FIXED    
Severity: crash CC: griffinvalley
Priority: NOR Keywords: drkonqi
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: unspecified   
OS: Linux   
Latest Commit: https://commits.kde.org/krita/9347112a77b3b628af8c0b8d4d7cbc0929eede9e Version Fixed/Implemented In:
Sentry Crash Report:

Description anton 2019-03-30 07:26:22 UTC 
Application: krita (4.1.8)

Qt Version: 5.12.0
Frameworks Version: 5.56.0
Operating System: Linux 4.15.0-46-generic x86_64
Distribution: KDE neon User Edition 5.15

-- Information about the crash:
- What I was doing when the application crashed:
select "smart patch". After this krita just crushing every time.

The crash can be reproduced every time.

-- Backtrace:
Application: Krita (krita), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fb0e569c840 (LWP 12238))]

Thread 5 (Thread 0x7fb09393b700 (LWP 12245)):
#0  0x00007fb0e0b9cbf9 in __GI___poll (fds=0x7fb08c00ef20, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb0d964f539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb0d964f64c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb0e16f715b in QEventDispatcherGlib::processEvents (this=0x7fb08c000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fb0e169864a in QEventLoop::exec (this=this@entry=0x7fb09393acf0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#5  0x00007fb0e14c041a in QThread::exec (this=this@entry=0x561492ad3540) at thread/qthread.cpp:531
#6  0x00007fb0c85bf1c6 in QQuickPixmapReader::run (this=0x561492ad3540) at util/qquickpixmapcache.cpp:949
#7  0x00007fb0e14c1bc2 in QThreadPrivate::start (arg=0x561492ad3540) at thread/qthread_unix.cpp:361
#8  0x00007fb0daf4b6db in start_thread (arg=0x7fb09393b700) at pthread_create.c:463
#9  0x00007fb0e0ba988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fb0a48c1700 (LWP 12244)):
#0  0x00007fb0e0b9cbf9 in __GI___poll (fds=0x7fb09c000b20, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fb0d964f539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb0d964f64c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb0e16f715b in QEventDispatcherGlib::processEvents (this=0x7fb09c003ce0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fb0e169864a in QEventLoop::exec (this=this@entry=0x7fb0a48c0d40, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#5  0x00007fb0e14c041a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:531
#6  0x00007fb0c3c782e5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fb0e14c1bc2 in QThreadPrivate::start (arg=0x5614929c7680) at thread/qthread_unix.cpp:361
#8  0x00007fb0daf4b6db in start_thread (arg=0x7fb0a48c1700) at pthread_create.c:463
#9  0x00007fb0e0ba988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fb0a40c0700 (LWP 12243)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fb0e14c4580 in QtLinuxFutex::_q_futex (val3=0, addr2=0x0, val2=0, val=<optimized out>, op=0, addr=<optimized out>) at thread/qfutex_p.h:92
#2  QtLinuxFutex::futexWait<QBasicAtomicInteger<unsigned int> > (expectedValue=<optimized out>, futex=...) at thread/qfutex_p.h:107
#3  futexSemaphoreTryAcquire_loop<true> (u=..., curValue=<optimized out>, nn=8589934593, timeout=<optimized out>) at thread/qsemaphore.cpp:219
#4  0x00007fb0e14c43f2 in futexSemaphoreTryAcquire<true> (timeout=<optimized out>, n=<optimized out>, u=...) at thread/qsemaphore.cpp:262
#5  QSemaphore::tryAcquire (this=0x5614912d7c30, n=<optimized out>, timeout=<optimized out>) at thread/qsemaphore.cpp:484
#6  0x00007fb0deeeddba in KisTileDataSwapper::run() () from /usr/lib/x86_64-linux-gnu/libkritaimage.so.17
#7  0x00007fb0e14c1bc2 in QThreadPrivate::start (arg=0x7fb0df3e3ca0) at thread/qthread_unix.cpp:361
#8  0x00007fb0daf4b6db in start_thread (arg=0x7fb0a40c0700) at pthread_create.c:463
#9  0x00007fb0e0ba988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fb0bd5e9700 (LWP 12240)):
#0  0x00007fb0e0b980b4 in __GI___libc_read (fd=18, buf=0x7fb0bd5e8b20, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fb0d9693cd0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb0d964f027 in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb0d964f4e0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb0d964f64c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb0e16f715b in QEventDispatcherGlib::processEvents (this=0x7fb0b8000b20, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007fb0e169864a in QEventLoop::exec (this=this@entry=0x7fb0bd5e8d30, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#7  0x00007fb0e14c041a in QThread::exec (this=<optimized out>) at thread/qthread.cpp:531
#8  0x00007fb0db179015 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#9  0x00007fb0e14c1bc2 in QThreadPrivate::start (arg=0x7fb0db3f0d80) at thread/qthread_unix.cpp:361
#10 0x00007fb0daf4b6db in start_thread (arg=0x7fb0bd5e9700) at pthread_create.c:463
#11 0x00007fb0e0ba988f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fb0e569c840 (LWP 12238)):
[KCrash Handler]
#6  __strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:120
#7  0x00007fb0e14d2b07 in QByteArray::append (this=this@entry=0x7fff868ba140, str=0x2d7 <error: Cannot access memory at address 0x2d7>) at tools/qbytearray.cpp:2094
#8  0x00007fb0e1fe25e4 in QOpenGLEngineSharedShaders::findProgramInCache (this=0x561488464360, prog=...) at opengl/qopenglengineshadermanager.cpp:386
#9  0x00007fb0e1fe2885 in QOpenGLEngineShaderManager::useCorrectShaderProg (this=0x561493ea38b0) at opengl/qopenglengineshadermanager.cpp:880
#10 0x00007fb0e1fea435 in QOpenGL2PaintEngineExPrivate::prepareForDraw (this=0x5614975e1680, srcPixelsAreOpaque=<optimized out>) at opengl/qopenglpaintengine.cpp:1278
#11 0x00007fb0e1fec30d in QOpenGL2PaintEngineExPrivate::stroke (this=this@entry=0x5614975e1680, path=..., pen=...) at opengl/qopenglpaintengine.cpp:1412
#12 0x00007fb0e1fec69f in QOpenGL2PaintEngineEx::stroke (this=0x5614956ceb80, path=..., pen=...) at opengl/qopenglpaintengine.cpp:1370
#13 0x00007fb0e1ed2696 in QPaintEngineEx::draw (this=0x5614956ceb80, path=...) at painting/qpaintengineex.cpp:603
#14 0x00007fb0e1effa92 in QPainter::drawPath (this=<optimized out>, path=...) at painting/qpainter.cpp:3399
#15 0x00007fb0aa5659a3 in ?? () from /usr/lib/x86_64-linux-gnu/kritaplugins/kritatoolSmartPatch.so
#16 0x00007fb0e406aec4 in KisCanvasWidgetBase::drawDecorations(QPainter&, QRect const&) const () from /usr/lib/x86_64-linux-gnu/libkritaui.so.17
#17 0x00007fb0e4249b4d in KisOpenGLCanvas2::renderDecorations(QPainter*) () from /usr/lib/x86_64-linux-gnu/libkritaui.so.17
#18 0x00007fb0e425043e in KisOpenGLCanvas2::paintGL() () from /usr/lib/x86_64-linux-gnu/libkritaui.so.17
#19 0x00007fb0e24f15ad in QOpenGLWidgetPrivate::invokeUserPaint (this=0x56149377f540) at kernel/qopenglwidget.cpp:878
#20 0x00007fb0e24d0838 in QWidget::event (this=0x5614937894b0, event=0x7fff868bad50) at kernel/qwidget.cpp:9268
#21 0x00007fb0e249083c in QApplicationPrivate::notify_helper (this=this@entry=0x561487feb1f0, receiver=receiver@entry=0x5614937894b0, e=e@entry=0x7fff868bad50) at kernel/qapplication.cpp:3752
#22 0x00007fb0e2497dd0 in QApplication::notify (this=0x7fff868be500, receiver=0x5614937894b0, e=0x7fff868bad50) at kernel/qapplication.cpp:3499
#23 0x00007fb0e43abb17 in KisApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libkritaui.so.17
#24 0x00007fb0e169a328 in QCoreApplication::notifyInternal2 (receiver=0x5614937894b0, event=0x7fff868bad50) at kernel/qcoreapplication.cpp:1061
#25 0x00007fb0e169a50e in QCoreApplication::sendSpontaneousEvent (receiver=receiver@entry=0x5614937894b0, event=event@entry=0x7fff868bad50) at kernel/qcoreapplication.cpp:1463
#26 0x00007fb0e24c9405 in QWidgetPrivate::sendPaintEvent (this=this@entry=0x56149377f540, toBePainted=...) at kernel/qwidget.cpp:5655
#27 0x00007fb0e24c9bdd in QWidgetPrivate::drawWidget (this=this@entry=0x56149377f540, pdev=pdev@entry=0x5614930310a0, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=<optimized out>) at kernel/qwidget.cpp:5595
#28 0x00007fb0e24ca840 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561493772180, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5790
#29 0x00007fb0e24c95ce in QWidgetPrivate::drawWidget (this=this@entry=0x561493772180, pdev=pdev@entry=0x5614930310a0, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=<optimized out>) at kernel/qwidget.cpp:5646
#30 0x00007fb0e24ca840 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x56149368e2e0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5790
#31 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x56149368e2e0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#32 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x56149368e2e0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#33 0x00007fb0e24c95ce in QWidgetPrivate::drawWidget (this=this@entry=0x56149368e2e0, pdev=pdev@entry=0x5614930310a0, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=<optimized out>) at kernel/qwidget.cpp:5646
#34 0x00007fb0e24ca840 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561493778e70, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5790
#35 0x00007fb0e24c95ce in QWidgetPrivate::drawWidget (this=this@entry=0x561493778e70, pdev=pdev@entry=0x5614930310a0, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=<optimized out>) at kernel/qwidget.cpp:5646
#36 0x00007fb0e24ca840 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561493da5210, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5790
#37 0x00007fb0e24c95ce in QWidgetPrivate::drawWidget (this=this@entry=0x561493da5210, pdev=pdev@entry=0x5614930310a0, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=<optimized out>) at kernel/qwidget.cpp:5646
#38 0x00007fb0e24ca840 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490b99390, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5790
#39 0x00007fb0e24c95ce in QWidgetPrivate::drawWidget (this=this@entry=0x561490b99390, pdev=pdev@entry=0x5614930310a0, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=<optimized out>) at kernel/qwidget.cpp:5646
#40 0x00007fb0e24ca840 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x56148f4601c0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5790
#41 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x56148f4601c0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#42 0x00007fb0e24c95ce in QWidgetPrivate::drawWidget (this=this@entry=0x56148f4601c0, pdev=pdev@entry=0x5614930310a0, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=<optimized out>) at kernel/qwidget.cpp:5646
#43 0x00007fb0e24ca840 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561488a964b0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5790
#44 0x00007fb0e24c95ce in QWidgetPrivate::drawWidget (this=this@entry=0x561488a964b0, pdev=pdev@entry=0x5614930310a0, rgn=..., offset=..., flags=flags@entry=4, sharedPainter=sharedPainter@entry=0x0, backingStore=<optimized out>) at kernel/qwidget.cpp:5646
#45 0x00007fb0e24ca840 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5790
#46 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#47 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#48 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#49 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#50 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#51 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#52 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#53 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#54 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#55 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#56 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#57 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#58 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#59 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#60 0x00007fb0e24ca9c9 in QWidgetPrivate::paintSiblingsRecursive (this=this@entry=0x561490bd26a0, pdev=pdev@entry=0x5614930310a0, siblings=..., index=<optimized out>, rgn=..., offset=..., flags=4, sharedPainter=0x0, backingStore=0x561490b79790) at kernel/qwidget.cpp:5776
#61 0x00007fb0e24c95ce in QWidgetPrivate::drawWidget (this=this@entry=0x561490bd26a0, pdev=0x5614930310a0, rgn=..., offset=..., flags=flags@entry=5, sharedPainter=sharedPainter@entry=0x0, backingStore=<optimized out>) at kernel/qwidget.cpp:5646
#62 0x00007fb0e24a0326 in QWidgetBackingStore::doSync (this=this@entry=0x561490b79790) at kernel/qwidgetbackingstore.cpp:1428
#63 0x00007fb0e24a0565 in QWidgetBackingStore::sync (this=0x561490b79790) at kernel/qwidgetbackingstore.cpp:1209
#64 0x00007fb0e24b893f in QWidgetPrivate::syncBackingStore (this=0x561490bd26a0) at kernel/qwidget.cpp:1956
#65 0x00007fb0e24d09a8 in QWidget::event (this=this@entry=0x56148f8751d0, event=event@entry=0x56148e960cc0) at kernel/qwidget.cpp:9207
#66 0x00007fb0e25d9030 in QMainWindow::event (this=0x56148f8751d0, event=0x56148e960cc0) at widgets/qmainwindow.cpp:1339
#67 0x00007fb0e30d5e17 in KMainWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libkritawidgetutils.so.17
#68 0x00007fb0e310c889 in KXmlGuiWindow::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libkritawidgetutils.so.17
#69 0x00007fb0e249083c in QApplicationPrivate::notify_helper (this=this@entry=0x561487feb1f0, receiver=receiver@entry=0x56148f8751d0, e=e@entry=0x56148e960cc0) at kernel/qapplication.cpp:3752
#70 0x00007fb0e2497dd0 in QApplication::notify (this=0x7fff868be500, receiver=0x56148f8751d0, e=0x56148e960cc0) at kernel/qapplication.cpp:3499
#71 0x00007fb0e43abb17 in KisApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libkritaui.so.17
#72 0x00007fb0e169a328 in QCoreApplication::notifyInternal2 (receiver=0x56148f8751d0, event=0x56148e960cc0) at kernel/qcoreapplication.cpp:1061
#73 0x00007fb0e169a4fe in QCoreApplication::sendEvent (receiver=<optimized out>, event=event@entry=0x56148e960cc0) at kernel/qcoreapplication.cpp:1451
#74 0x00007fb0e169ce87 in QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x561487fe6540) at kernel/qcoreapplication.cpp:1800
#75 0x00007fb0e169d428 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1654
#76 0x00007fb0e16f7b23 in postEventSourceDispatch (s=0x56148803dca0) at kernel/qeventdispatcher_glib.cpp:276
#77 0x00007fb0d964f387 in g_main_context_dispatch () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#78 0x00007fb0d964f5c0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#79 0x00007fb0d964f64c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#80 0x00007fb0e16f713f in QEventDispatcherGlib::processEvents (this=0x5614880955e0, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#81 0x00007fb0e169864a in QEventLoop::exec (this=this@entry=0x7fff868be380, flags=..., flags@entry=...) at kernel/qeventloop.cpp:225
#82 0x00007fb0e16a1800 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1364
#83 0x000056148584bfa8 in main ()

Reported using DrKonqi
Comment 1 wolthera 2019-03-30 11:35:25 UTC 
Yup, confirmed here.

Using asan build, I get slightly different backtraces:

ASAN:DEADLYSIGNAL
=================================================================
==28456==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fe3402165c7 bp 0x7fff44377ed0 sp 0x7fff44377648 T0)
==28456==The signal is caused by a READ memory access.
==28456==Hint: address points to the zero page.
AddressSanitizer: nested bug in the same thread, aborting.

And asan+gdb:

Thread 1 "krita" received signal SIGSEGV, Segmentation fault.
__strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:93
93      ../sysdeps/x86_64/multiarch/strlen-avx2.S: No such file or directory.
(gdb) thread apply all backtrace

Thread 57 (Thread 0x7fff8063c700 (LWP 26786)):
#0  0x00007fffea103ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, 
    reltime=0x7fff8063bb80, expected=0, futex_word=0x608000356e74)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  __pthread_cond_wait_common (abstime=0x7fff8063bc40, mutex=0x608000356e20, 
    cond=0x608000356e48) at pthread_cond_wait.c:533
#2  __pthread_cond_timedwait (cond=0x608000356e48, mutex=0x608000356e20, 
    abstime=0x7fff8063bc40) at pthread_cond_wait.c:667
#3  0x00007fffeb161ac6 in QWaitCondition::wait(QMutex*, QDeadlineTimer) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fffeb161e25 in QWaitCondition::wait(QMutex*, unsigned long) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fffeb15f5dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fffeb15abc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffea0fd6db in start_thread (arg=0x7fff8063c700) at pthread_create.c:463
#8  0x00007fffea84288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 56 (Thread 0x7fff84a8c700 (LWP 26785)):
#0  0x00007fffea103ed9 in futex_reltimed_wait_cancelable (private=<optimized out>, 
    reltime=0x7fff84a8bb80, expected=0, futex_word=0x6080003556f4)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:142
#1  __pthread_cond_wait_common (abstime=0x7fff84a8bc40, mutex=0x6080003556a0, 
    cond=0x6080003556c8) at pthread_cond_wait.c:533
#2  __pthread_cond_timedwait (cond=0x6080003556c8, mutex=0x6080003556a0, 
    abstime=0x7fff84a8bc40) at pthread_cond_wait.c:667
#3  0x00007fffeb161ac6 in QWaitCondition::wait(QMutex*, QDeadlineTimer) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fffeb161e25 in QWaitCondition::wait(QMutex*, unsigned long) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fffeb15f5dd in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fffeb15abc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffea0fd6db in start_thread (arg=0x7fff84a8c700) at pthread_create.c:463
#8  0x00007fffea84288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7fff994c3700 (LWP 15084)):
#0  0x00007fffea835bf9 in __GI___poll (fds=0x602000050130, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff6e55701 in poll () from /usr/lib/x86_64-linux-gnu/libasan.so.4
#2  0x00007fffe10ae539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffe10ae64c in g_main_context_iteration ()
   from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fffeb39015b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fffeb33164a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fffeb15941a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffeb15abc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fffea0fd6db in start_thread (arg=0x7fff994c3700) at pthread_create.c:463
---Type <return> to continue, or q <return> to quit---
#9  0x00007fffea84288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7fff9a529700 (LWP 15075)):
#0  0x00007fffea835bf9 in __GI___poll (fds=0x60200045a710, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff6e55701 in poll () from /usr/lib/x86_64-linux-gnu/libasan.so.4
#2  0x00007fffe10ae539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffe10ae64c in g_main_context_iteration ()
   from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fffeb39013f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fffeb33164a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fffeb15941a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffcd9431c6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007fffeb15abc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fffea0fd6db in start_thread (arg=0x7fff9a529700) at pthread_create.c:463
#10 0x00007fffea84288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7fff9e5b5700 (LWP 15066)):
#0  0x00007fffea835bf9 in __GI___poll (fds=0x60200042b030, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff6e55701 in poll () from /usr/lib/x86_64-linux-gnu/libasan.so.4
#2  0x00007fffe10ae539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffe10ae64c in g_main_context_iteration ()
   from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fffeb39013f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fffeb33164a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fffeb15941a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffcd47e2e5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fffeb15abc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fffea0fd6db in start_thread (arg=0x7fff9e5b5700) at pthread_create.c:463
#10 0x00007fffea84288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7fff8fbff700 (LWP 15025)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fffeb15d580 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fffeb15d3f2 in QSemaphore::tryAcquire(int, int) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fffed7adb2b in KisTileDataSwapper::waitForWork (this=
    0x7fffeea0bd40 <(anonymous namespace)::Q_QGS_s_instance::innerFunction()::holder+64>)
    at /home/wolthera/krita/src/libs/image/tiles3/swap/kis_tile_data_swapper.cpp:86
#4  0x00007fffed7adb46 in KisTileDataSwapper::run (
    this=0x7fffeea0bd40 <(anonymous namespace)::Q_QGS_s_instance::innerFunction()::holder+64>) at /home/wolthera/krita/src/libs/image/tiles3/swap/kis_tile_data_swapper.cpp:92
#5  0x00007fffeb15abc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fffea0fd6db in start_thread (arg=0x7fff8fbff700) at pthread_create.c:463
---Type <return> to continue, or q <return> to quit---
#7  0x00007fffea84288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7fff91c80700 (LWP 15019)):
#0  0x00007fffea835bf9 in __GI___poll (fds=0x602000233bd0, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff6e55701 in poll () from /usr/lib/x86_64-linux-gnu/libasan.so.4
#2  0x00007fffe10ae539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffe10ae64c in g_main_context_iteration ()
   from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fffeb39013f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fffeb33164a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fffeb15941a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffeb15abc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fffea0fd6db in start_thread (arg=0x7fff91c80700) at pthread_create.c:463
#9  0x00007fffea84288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fffd0844700 (LWP 14761)):
#0  0x00007fffea1039f3 in futex_wait_cancelable (private=<optimized out>, expected=0, 
    futex_word=0x614000007908) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x6140000078b8, cond=0x6140000078e0)
    at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x6140000078e0, mutex=0x6140000078b8)
    at pthread_cond_wait.c:655
#3  0x00007fffc6665b1b in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#4  0x00007fffc6665847 in ?? () from /usr/lib/x86_64-linux-gnu/dri/i965_dri.so
#5  0x00007fffea0fd6db in start_thread (arg=0x7fffd0844700) at pthread_create.c:463
#6  0x00007fffea84288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fffc53a2700 (LWP 14760)):
#0  0x00007fffea835bf9 in __GI___poll (fds=0x7fffc53a1c38, nfds=1, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff6e55701 in poll () from /usr/lib/x86_64-linux-gnu/libasan.so.4
#2  0x00007fffdfe1a747 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fffdfe1c36a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#4  0x00007fffd1b8d32a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#5  0x00007fffeb15abc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fffea0fd6db in start_thread (arg=0x7fffc53a2700) at pthread_create.c:463
#7  0x00007fffea84288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fffc92cd700 (LWP 14750)):
#0  0x00007fffea835bf9 in __GI___poll (fds=0x60300268bac0, nfds=4, timeout=-1)
    at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff6e55701 in poll () from /usr/lib/x86_64-linux-gnu/libasan.so.4
#2  0x00007fffe10ae539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fffe10ae64c in g_main_context_iteration ()
   from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fffeb39013f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEvents---Type <return> to continue, or q <return> to quit---
Flag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fffeb33164a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fffeb15941a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fffe27b5015 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#8  0x00007fffeb15abc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fffea0fd6db in start_thread (arg=0x7fffc92cd700) at pthread_create.c:463
#10 0x00007fffea84288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ffff7f80880 (LWP 14590)):
#0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:93
#1  0x00007ffff6e6b57c in ?? () from /usr/lib/x86_64-linux-gnu/libasan.so.4
#2  0x00007fffeb16bb07 in QByteArray::append(char const*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#3  0x00007fffebc7b5e4 in QOpenGLEngineSharedShaders::findProgramInCache(QOpenGLEngineShaderProg const&) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#4  0x00007fffebc7b885 in QOpenGLEngineShaderManager::useCorrectShaderProg() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#5  0x00007fffebc83435 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#6  0x00007fffebc8530d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#7  0x00007fffebc8569f in QOpenGL2PaintEngineEx::stroke(QVectorPath const&, QPen const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#8  0x00007fffebb6b696 in QPaintEngineEx::draw(QVectorPath const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#9  0x00007fffebb98a92 in QPainter::drawPath(QPainterPath const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#10 0x00007fffa028520e in KisToolSmartPatch::paint (this=0x613000413040, painter=..., 
    converter=...)
    at /home/wolthera/krita/src/plugins/tools/tool_smart_patch/kis_tool_smart_patch.cpp:250
#11 0x00007fffe76020aa in KoToolProxy::paint (this=0x61400123eea0, painter=..., 
    converter=...) at /home/wolthera/krita/src/libs/flake/KoToolProxy.cpp:144
#12 0x00007ffff17aa462 in KisCanvasWidgetBase::drawDecorations (this=0x607000a608c8, gc=..., 
    updateWidgetRect=...)
    at /home/wolthera/krita/src/libs/ui/canvas/kis_canvas_widget_base.cpp:159
#13 0x00007ffff1e0a0ab in KisOpenGLCanvas2::renderDecorations (this=0x607000a60890, 
    painter=0x7fffffff7f90)
    at /home/wolthera/krita/src/libs/ui/opengl/kis_opengl_canvas2.cpp:919
#14 0x00007ffff1e0270c in KisOpenGLCanvas2::paintGL (this=0x607000a60890)
    at /home/wolthera/krita/src/libs/ui/opengl/kis_opengl_canvas2.cpp:408
#15 0x00007fffec18a5ad in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#16 0x00007fffec169838 in QWidget::event(QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#17 0x00007fffec12983c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#18 0x00007fffec130dd0 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#19 0x00007ffff23303f5 in KisApplication::notify (this=0x7fffffffe080, 
    receiver=0x607000a60890, event=0x7fffffff8660)
    at /home/wolthera/krita/src/libs/ui/KisApplication.cpp:639
---Type <return> to continue, or q <return> to quit---
#20 0x00007fffeb333328 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007fffec162405 in QWidgetPrivate::sendPaintEvent(QRegion const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007fffec162bdd in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007fffec163840 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007fffec1625ce in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007fffec163840 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007fffec1625ce in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007fffec163840 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007fffec1639c9 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007fffec1639c9 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#30 0x00007fffec1625ce in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007fffec163840 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#32 0x00007fffec1625ce in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#33 0x00007fffec163840 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#34 0x00007fffec1625ce in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#35 0x00007fffec163840 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#36 0x00007fffec1625ce in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
---Type <return> to continue, or q <return> to quit---
#37 0x00007fffec163840 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#38 0x00007fffec1625ce in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#39 0x00007fffec163840 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#40 0x00007fffec1639c9 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#41 0x00007fffec1639c9 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#42 0x00007fffec1639c9 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList<QObject*> const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#43 0x00007fffec1625ce in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#44 0x00007fffec139326 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#45 0x00007fffec139565 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#46 0x00007fffec15193f in QWidgetPrivate::syncBackingStore() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#47 0x00007fffec1699a8 in QWidget::event(QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#48 0x00007fffec272030 in QMainWindow::event(QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#49 0x00007fffecf6fd42 in KMainWindow::event (this=0x60c001224ac0, ev=0x603002164e70)
    at /home/wolthera/krita/src/libs/widgetutils/xmlgui/kmainwindow.cpp:784
#50 0x00007fffed00afab in KXmlGuiWindow::event (this=0x60c001224ac0, ev=0x603002164e70)
    at /home/wolthera/krita/src/libs/widgetutils/xmlgui/kxmlguiwindow.cpp:125
#51 0x00007fffec12983c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#52 0x00007fffec130dd0 in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#53 0x00007ffff23303f5 in KisApplication::notify (this=0x7fffffffe080, 
    receiver=0x60c001224ac0, event=0x603002164e70)
    at /home/wolthera/krita/src/libs/ui/KisApplication.cpp:639
#54 0x00007fffeb333328 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#55 0x00007fffeb335e87 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#56 0x00007fffeb390b23 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#57 0x00007fffe10ae387 in g_main_context_dispatch ()
   from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#58 0x00007fffe10ae5c0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#59 0x00007fffe10ae64c in g_main_context_iteration ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#60 0x00007fffeb39013f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#61 0x00007fffeb33164a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#62 0x00007fffeb33a800 in QCoreApplication::exec() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#63 0x0000555557a36582 in main (argc=1, argv=0x7fffffffe218)
    at /home/wolthera/krita/src/krita/main.cc:481
(gdb)
Comment 2 wolthera 2019-03-30 20:51:43 UTC 
Git commit abadb66e8e7b23534987b9f281104d68876d3b54 by Wolthera van Hövell tot Westerflier.
Committed on 30/03/2019 at 20:47.
Pushed by woltherav into branch 'master'.
Related: bug 5, bug 12

Qt 5.12 doesn't support QPainter::RasterOp_SourceXorDestination anymore.

Trying to paint with a painter that uses this while opengl is enabled
will lead to a crash. The only relevant place this enum value is still used
is in kis_tool.cc, where it is only painted on the regular non-accelerated canvas.

Anyhow, told the smartpatch to use this function instead of doing something itself.

The whole thing is a little bizar.

M  +2    -3    plugins/tools/tool_smart_patch/kis_tool_smart_patch.cpp

https://commits.kde.org/krita/abadb66e8e7b23534987b9f281104d68876d3b54
Comment 3 wolthera 2019-03-30 20:53:15 UTC 
Git commit 9347112a77b3b628af8c0b8d4d7cbc0929eede9e by Wolthera van Hövell tot Westerflier.
Committed on 30/03/2019 at 20:53.
Pushed by woltherav into branch 'krita/4.1'.
Related: bug 5, bug 12

Qt 5.12 doesn't support QPainter::RasterOp_SourceXorDestination anymore.

Trying to paint with a painter that uses this while opengl is enabled
will lead to a crash. The only relevant place this enum value is still used
is in kis_tool.cc, where it is only painted on the regular non-accelerated canvas.

Anyhow, told the smartpatch to use this function instead of doing something itself.

The whole thing is a little bizar.

M  +2    -3    plugins/tools/tool_smart_patch/kis_tool_smart_patch.cpp

https://commits.kde.org/krita/9347112a77b3b628af8c0b8d4d7cbc0929eede9e