This happens on master as well as the 3.1.3 alpha I believe. On Ubuntu 16.10

Going to the straight line tool and using it ok. If you are painting and press the "V" hotkey and try to draw a straight line, krita crashes.

here is the backtrace through GDB...


Thread 1 "krita" received signal SIGSEGV, Segmentation fault.
0x00007ffff5f94ec2 in QCoreApplicationPrivate::sendThroughApplicationEventFilters(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) backtrace
#0  0x00007ffff5f94ec2 in QCoreApplicationPrivate::sendThroughApplicationEventFilters(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007ffff68d08e8 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#2  0x00007ffff68d5d4f in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#3  0x00007ffff78b7c17 in KisApplication::notify (this=<optimized out>, receiver=0x55555c154140, 
    event=0x7fffff7ff5e0) at /home/scott/kf5/src/krita/libs/ui/KisApplication.cpp:542
#4  0x00007ffff5f953b0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007ffff69337fb in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#6  0x00007ffff68d08ac in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#7  0x00007ffff68d5d4f in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#8  0x00007ffff78b7c17 in KisApplication::notify (this=<optimized out>, receiver=0x55555d8be2d0, 
    event=0x7fffff7ff5e0) at /home/scott/kf5/src/krita/libs/ui/KisApplication.cpp:542
#9  0x00007ffff5f953b0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007ffff62f3de7 in QWindowPrivate::setCursor(QCursor const*) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#11 0x00007ffff6901aef in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#12 0x00007ffff690bf79 in QWidget::setCursor(QCursor const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#13 0x00007ffff5fc2b49 in QMetaObject::activate(QObject*, int, int, void**) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007ffff2efa3c5 in KoToolBase::cursorChanged (this=this@entry=0x55555e231ff0, _t1=...)
    at /home/scott/kf5/build/libs/flake/moc_KoToolBase.cpp:252
#15 0x00007ffff2e18b4a in KoToolBase::useCursor (this=this@entry=0x55555e231ff0, cursor=...)