[Octave-bug-tracker] [bug #47699] FLTK can segfault after using legend

[Lachlan Andrew]

Update of bug #47699 (project octave):

        Operating System:                     Any => GNU/Linux              

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Follow-up Comment #10:

The problem seems to be that FLTK deletion triggers a callback while not all
of the graphics objects are valid.  That only causes a problem if callbacks
trigger redraws.

One approach is simply to back out changeset 21543:4f0f9f029d12.

Another is to place a lock around the deletion (attached patch).

I don't like fixing all bugs by adding extra code.  Would it be better to try
to modify the FLTK code to ensure callbacks only happen when all objects are
valid?  That would make the code "delicate", and leaves the possibility of
similar bugs from other pieces of code

(file #36986)
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Additional Item Attachment:

File name: bug_47699_fltk_close           Size:1 KB


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