[Octave-bug-tracker] [bug #58403] "uicontextmenu" property is not empty immediately after deleting corresponding graphics object

[Markus Mützel]

URL:
  <https://savannah.gnu.org/bugs/?58403>

                 Summary: "uicontextmenu" property is not empty immediately
after deleting corresponding graphics object
                 Project: GNU Octave
            Submitted by: mmuetzel
            Submitted on: Tue 19 May 2020 03:15:01 PM CEST
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 6.0.90
         Discussion Lock: Any
        Operating System: Any

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Details:

The tests for the buildbots sporadically fail for this BIST:

>>>>> processing
/scratch/buildbot/workers/jwe-debian-x86_64-3/gcc-7-lto-debian/build/libinterp/corefcn/graphics.cc-tst
***** test
 hf = figure ("visible", "off");
 hax = axes ("parent", hf);
 unwind_protect
   hctx1 = uicontextmenu ("parent", hf);
   hctx2 = uicontextmenu ("parent", hf);
   set (hf, "uicontextmenu", hctx2);
   set (hax, "uicontextmenu", hctx2);
   assert (get (hf, "uicontextmenu"), hctx2);
   assert (get (hax, "uicontextmenu"), hctx2);
   assert (get (hf, "children"), [hctx2; hctx1; hax]);
   delete (hctx2);
   assert (get (hf, "uicontextmenu"), []);
   assert (get (hax, "uicontextmenu"), []);
   assert (get (hf, "children"), [hctx1; hax]);
   set (hf, "uicontextmenu", hctx1);
   assert (get (hf, "uicontextmenu"), hctx1);
   set (hf, "uicontextmenu", []);
   assert (get (hf, "uicontextmenu"), []);
   assert (get (hf, "children"), [hctx1; hax]);
 unwind_protect_cleanup
   close (hf);
 end_unwind_protect;
!!!!! test failed
ASSERT errors for:  assert (get (hf, "uicontextmenu"),[])
  Location  |  Observed  |  Expected  |  Reason
     .          O(1x1)       E(0x0)      Dimensions don't match


See e.g.:
http://buildbot.octave.org:8010/#/builders/24/builds/1235/steps/6/logs/stdio

This is probably a multi-threading issue that leads to the "uicontextmenu"
property of the figure not being empty immediately after the corresponding
"uicontextmenu" graphics object is deleted.

I also see this error randomly when running "make check" on my system.




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