[Octave-bug-tracker] [bug #44330] Qt toolkit segmentation fault when figure opened, closed, and opened again

[Dmitri A. Sergatskov]

Follow-up Comment #29, bug #44330 (project octave):

The issue is with the recent snapshots  (at the moment it is
​
 hg id
d4ef04757ead tip @​)

compiled with (-O2 -fsanitize=undefined):



octave:1> f = figure; c = uicontrol( 'parent', f, 'string', 'button' );
delete(c); delete(f)
octave:2> /usr/include/qt5/QtWidgets/qwidget.h:746:35: runtime error: downcast
of address 0x0000010f7b00 which does not point to an object of type 'QWidget'
0x0000010f7b00: note: object is of type 'QObject'
 00 00 00 00  e0 9e 7b a9 bf 7f 00 00  60 ed 11 01 00 00 00 00  b8 6b c6 a9 bf
7f 00 00  00 00 0f 01
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'QObject'
../libgui/graphics/Container.cc:110:67: runtime error: member call on address
0x0000010f7b00 which does not point to an object of type 'QWidget'
0x0000010f7b00: note: object is of type 'QObject'
 00 00 00 00  e0 9e 7b a9 bf 7f 00 00  60 ed 11 01 00 00 00 00  b8 6b c6 a9 bf
7f 00 00  00 00 0f 01
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'QObject'
warning: base_graphics_object::get_properties: invalid graphics object
terminate called after throwing an instance of 'std::bad_cast'
  what():  std::bad_cast
Aborted (core dumped)



The qt backend on this particular computer (i7-2600K intel graphics) is all
messed
up -- the qt window would not refresh until I do e.g. "print".

​
​Dmitri.​

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