Application: krita (2.9.7)
KDE Platform Version: 4.14.16
Qt Version: 4.8.7
Operating System: Linux 4.4.0-31-generic x86_64
Distribution: Ubuntu 16.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:
Using a simple inking brush and two vanishing points. "Snap Single" is enabled by default, causing the crash. However, if the "Snap single" is disabled, and then enabled, the problem disappears.

- Custom settings of the application:
Custom grid size, and a large memory limit (14 GiB). Lack of memory is clearly not the problem.

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 0x7f12b8125900 (LWP 23149))]

Thread 5 (Thread 0x7f128cb3d700 (LWP 23161)):
#0  0x00007f12afc1eac9 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f12afbda2a0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f12afbda4ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f12b5ff12ce in QEventDispatcherGlib::processEvents (this=0x7f12680008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:452
#4  0x00007f12b5fbf18f in QEventLoop::processEvents (this=this@entry=0x7f128cb3cc80, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f12b5fbf4f5 in QEventLoop::exec (this=this@entry=0x7f128cb3cc80, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f12b5eae549 in QThread::exec (this=this@entry=0x374d670) at thread/qthread.cpp:538
#7  0x00007f12b5f9f223 in QInotifyFileSystemWatcherEngine::run (this=0x374d670) at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007f12b5eb0e3c in QThreadPrivate::start (arg=0x374d670) at thread/qthread_unix.cpp:352
#9  0x00007f12b00c16fa in start_thread (arg=0x7f128cb3d700) at pthread_create.c:333
#10 0x00007f12b55dbb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7f1285dc9700 (LWP 23160)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f12b5eb13a6 in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x374d570) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x374d0d8, mutex=mutex@entry=0x374d0d0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f12b6eef9ac in QFileInfoGatherer::run (this=0x374d0c0) at dialogs/qfileinfogatherer.cpp:214
#4  0x00007f12b5eb0e3c in QThreadPrivate::start (arg=0x374d0c0) at thread/qthread_unix.cpp:352
#5  0x00007f12b00c16fa in start_thread (arg=0x7f1285dc9700) at pthread_create.c:333
#6  0x00007f12b55dbb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7f12865ca700 (LWP 23158)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:225
#1  0x00007f12b5eaf7ea in thread_sleep (ti=ti@entry=0x7f12865c9ce0) at thread/qthread_unix.cpp:495
#2  0x00007f12b5eb019d in QThread::msleep (msecs=msecs@entry=700) at thread/qthread_unix.cpp:521
#3  0x00007f12b2df149a in KisTileDataSwapper::run (this=0x2fb0760) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/image/tiles3/swap/kis_tile_data_swapper.cpp:97
#4  0x00007f12b5eb0e3c in QThreadPrivate::start (arg=0x2fb0760) at thread/qthread_unix.cpp:352
#5  0x00007f12b00c16fa in start_thread (arg=0x7f12865ca700) at pthread_create.c:333
#6  0x00007f12b55dbb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f1287fff700 (LWP 23157)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007f12b5eb13a6 in QWaitConditionPrivate::wait (time=18446744073709551615, this=0x2fb0a60) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=<optimized out>, mutex=mutex@entry=0x2fb0a10, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007f12b5ead0a3 in QSemaphore::acquire (this=this@entry=0x2fb0730, n=n@entry=1) at thread/qsemaphore.cpp:144
#4  0x00007f12b2dd504e in KisTileDataPooler::waitForWork (this=0x2fb0720) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/image/tiles3/kis_tile_data_pooler.cc:165
#5  0x00007f12b2dd5470 in KisTileDataPooler::run (this=0x2fb0720) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/image/tiles3/kis_tile_data_pooler.cc:187
#6  0x00007f12b5eb0e3c in QThreadPrivate::start (arg=0x2fb0720) at thread/qthread_unix.cpp:352
#7  0x00007f12b00c16fa in start_thread (arg=0x7f1287fff700) at pthread_create.c:333
#8  0x00007f12b55dbb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f12b8125900 (LWP 23149)):
[KCrash Handler]
#6  0x00007f12b78e3c9b in KisPaintingAssistantsDecoration::adjustPosition (this=0xabf89c0, point=..., strokeBegin=...) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/kis_painting_assistants_decoration.cpp:120
#7  0x00007f12b79b865c in KisToolFreehand::adjustPosition (this=0xcd40ea0, point=..., strokeBegin=...) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/tool/kis_tool_freehand.cc:372
#8  0x00007f12b79b8726 in KisToolFreehand::tryPickByPaintOp (this=this@entry=0xcd40ea0, event=event@entry=0x7fffa6eabc40, action=action@entry=KisTool::PickFgImage) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/tool/kis_tool_freehand.cc:250
#9  0x00007f12b79b8c06 in KisToolFreehand::beginPrimaryAction (this=0xcd40ea0, event=0x7fffa6eabc40) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/tool/kis_tool_freehand.cc:190
#10 0x00007f12b77a5aee in KisToolProxy::forwardToTool (this=this@entry=0xa5579c0, state=state@entry=KisToolProxy::BEGIN, action=action@entry=KisTool::Primary, event=event@entry=0x7fffa6eac410, docPoint=...) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/canvas/kis_tool_proxy.cpp:161
#11 0x00007f12b77a5e79 in KisToolProxy::forwardEvent (this=0xa5579c0, state=state@entry=KisToolProxy::BEGIN, action=action@entry=KisTool::Primary, event=event@entry=0x7fffa6eac410, originalEvent=originalEvent@entry=0x7fffa6eac410, lastTabletEvent=lastTabletEvent@entry=0x0) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/canvas/kis_tool_proxy.cpp:133
#12 0x00007f12b7a3368d in KisToolInvocationAction::begin (this=this@entry=0x2df3900, shortcut=<optimized out>, event=event@entry=0x7fffa6eac410) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/input/kis_tool_invocation_action.cpp:101
#13 0x00007f12b7a3d6c6 in KisShortcutMatcher::tryRunReadyShortcut (this=this@entry=0x2df34a0, button=<optimized out>, event=event@entry=0x7fffa6eac410) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/input/kis_shortcut_matcher.cpp:397
#14 0x00007f12b7a3d82f in KisShortcutMatcher::buttonPressed (this=this@entry=0x2df34a0, button=Qt::LeftButton, event=event@entry=0x7fffa6eac410) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/input/kis_shortcut_matcher.cpp:169
#15 0x00007f12b7a2fba5 in KisInputManager::eventFilter (this=0x2df32c0, object=<optimized out>, event=0x7fffa6eac410) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/input/kis_input_manager.cpp:648
#16 0x00007f12b5fc0a76 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x2089630, receiver=receiver@entry=0x1027d800, event=event@entry=0x7fffa6eac410) at kernel/qcoreapplication.cpp:1065
#17 0x00007f12b69d0fbc in QApplicationPrivate::notify_helper (this=this@entry=0x2089630, receiver=receiver@entry=0x1027d800, e=e@entry=0x7fffa6eac410) at kernel/qapplication.cpp:4566
#18 0x00007f12b69d80d6 in QApplication::notify (this=<optimized out>, receiver=receiver@entry=0x1027d800, e=e@entry=0x7fffa6eac410) at kernel/qapplication.cpp:4113
#19 0x00007f12b7a9f945 in KisApplication::notify (this=<optimized out>, receiver=0x1027d800, event=0x7fffa6eac410) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/ui/KisApplication.cpp:543
#20 0x00007f12b5fc090d in QCoreApplication::notifyInternal (this=0x7fffa6eacee0, receiver=receiver@entry=0x1027d800, event=event@entry=0x7fffa6eac410) at kernel/qcoreapplication.cpp:955
#21 0x00007f12b69d76dd in QCoreApplication::sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#22 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x1027d800, event=event@entry=0x7fffa6eac410, alienWidget=alienWidget@entry=0x0, nativeWidget=nativeWidget@entry=0x1027d800, buttonDown=buttonDown@entry=0x7f12b74fc368 <qt_button_down>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3178
#23 0x00007f12b6a553f2 in QETWidget::translateMouseEvent (this=this@entry=0x1027d800, event=event@entry=0x7fffa6eac770) at kernel/qapplication_x11.cpp:4638
#24 0x00007f12b6a54c83 in QApplication::x11ProcessEvent (this=0x7fffa6eacee0, event=event@entry=0x7fffa6eac770) at kernel/qapplication_x11.cpp:3626
#25 0x00007f12b6a7e542 in x11EventSourceDispatch (s=0x2085200, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#26 0x00007f12afbda1a7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f12afbda400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f12afbda4ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007f12b5ff12ae in QEventDispatcherGlib::processEvents (this=0x1f82040, flags=...) at kernel/qeventdispatcher_glib.cpp:450
#30 0x00007f12b6a7e616 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#31 0x00007f12b5fbf18f in QEventLoop::processEvents (this=this@entry=0x7fffa6eacb50, flags=...) at kernel/qeventloop.cpp:149
#32 0x00007f12b5fbf4f5 in QEventLoop::exec (this=this@entry=0x7fffa6eacb50, flags=...) at kernel/qeventloop.cpp:204
#33 0x00007f12b5fc54b9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1227
#34 0x00007f12b69cf22c in QApplication::exec () at kernel/qapplication.cpp:3828
#35 0x000000000040296a in main (argc=<optimized out>, argv=<optimized out>) at /build/calligra-ZNsRv2/calligra-2.9.7/krita/main.cc:192

Possible duplicates by query: bug 358906.

Reported using DrKonqi