Restoring an ellipse segment to a full ellipse causes internal error

[Paul Richter]

Version: Inkscape 0.92.2 (5c3e80d, 2017-08-06)
Build: built from source
OS: Slackware Linux 14.2

Description:
Create a new document, and draw an ellipse segment.

Shift-click on one of the segment endpoints, which should restore the full elliplse. The program displays an "Internal Error" dialog and immediately quits. A restored full ellipse is momentarily visible before the application window disappears.

The ellipse can be safely restored by editing the XML.

100% reproducible.

[Patrick Storz (ede123)]

Not reproduced on Windows 10 using either
- Inkscape 0.92.2 (5c3e80d, 2017-08-06)
- Inkscape 0.92.3 (2405546, 2018-03-11)

Could you attach a sample file with the precise steps leading to a crash for you?

Also a gdb backtrace might help.

[Patrick Storz (ede123)]

P.S. If you used Inkscape previously start with renaming preferences.xml to check if it's a preferences issue.

[Alvin Penner (apenner)]

on Windows 10, Inkscape 0.92.3 (2405546, 2018-03-11)

I have been able to reproduce the crash, no exit message in DOS, just a popup message saying a backup file was made. Will try to get a backtrace. The problem is not totally reproducible, maybe crashes half the time.
(after numerous tries, I cannot reproduce the crash when running gdb)

[Alvin Penner (apenner)]

likely a duplicate of
https://bugs.launchpad.net/inkscape/+bug/1522085

[Alvin Penner (apenner)]

backtrace:
Program received signal SIGSEGV, Segmentation fault.
0x0379a7a8 in libinkscape_base!_ZN16KnotHolderEntity11update_knotEv () from c:\program files (x86)\inkscape\libinkscape_base.dll
(gdb) bt
#0 0x0379a7a8 in libinkscape_base!_ZN16KnotHolderEntity11update_knotEv ()
   from c:\program files (x86)\inkscape\libinkscape_base.dll
#1 0x0379d358 in libinkscape_base!_ZN10KnotHolder20knot_clicked_handlerEP6SPKnotj ()
   from c:\program files (x86)\inkscape\libinkscape_base.dll
#2 0x03abfb21 in libinkscape_base!_ZN4sigc8internal9slot_callINS_18bound_mem_functor2Iv10KnotHolderP6SPKnotjEEvJS5_jEE7call_itEPNS0_8slot_repERKS5_RKj () from c:\program files (x86)\inkscape\libinkscape_base.dll
#3 0x0ae06260 in ?? ()
#4 0x0379cd53 in libinkscape_base!_Z32sp_knot_handler_request_positionP9_GdkEventP6SPKnot ()
   from c:\program files (x86)\inkscape\libinkscape_base.dll
#5 0x0330f95a in sp_marshal_BOOLEAN__POINTER () from c:\program files (x86)\inkscape\libinkscape_base.dll
#6 0x63c45f03 in ?? () from c:\program files (x86)\inkscape\libgobject-2.0-0.dll
#7 0x63c582cd in ?? () from c:\program files (x86)\inkscape\libgobject-2.0-0.dll
#8 0x63c5fbdd in ?? () from c:\program files (x86)\inkscape\libgobject-2.0-0.dll
#9 0x63c60937 in ?? () from c:\program files (x86)\inkscape\libgobject-2.0-0.dll
#10 0x0322c384 in libinkscape_base!_Z24sp_canvas_item_compare_zP12SPCanvasItemS0_ ()
   from c:\program files (x86)\inkscape\libinkscape_base.dll
#11 0x0322e34d in libinkscape_base!_ZN8SPCanvas13handle_buttonEP10_GtkWidgetP15_GdkEventButton ()
   from c:\program files (x86)\inkscape\libinkscape_base.dll
#12 0x0066f9f0 in ?? ()
#13 0x00000000 in ?? ()
(gdb) c
Continuing.
[New Thread 4280.0x1c24]

Program received signal SIGSEGV, Segmentation fault.
0x0379a7a8 in libinkscape_base!_ZN16KnotHolderEntity11update_knotEv () from c:\program files (x86)\inkscape\libinkscape_base.dll
(gdb) c
Continuing.
[Inferior 1 (process 4280) exited with code 030000000005]
(gdb) c
The program is not being run.