[Octave-bug-tracker] [bug #54507] Segfault in QT5 when resizing window during initialization

[Dan Sebald]

Follow-up Comment #4, bug #54507 (project octave):

There could be something in Octave.  For a half year or more I've been
experiencing a startup crash *only after compilation and build* when working
on a bug, and not every time after compilation.  Instead maybe every tenth or
fifteen time.  I'm using Mint linux.

It's the sort of thing in which, I'm guessing, the OS has to do a bit more
work to locate and load the executable for some reason.  (Maybe find the
program and put it in some hash table for quick future access?  Again, just
guessing.)

Every time I see this crash, I try thinking of a way I could devise a way to
find it, maybe make it occur regularly.  But then I just move on because the
next launch will work fine.

I keep thinking it might have something to do with loading GUI settings from
the previous session, that the long load delay causes the settings to clash
with whatever else is happening at start up.  But again, that is only a
general feeling.

So, the comment here about moving the window makes me wonder.  Window managers
often do some fancy stuff.  For example, it wouldn't surprise me if launching
an application in GTK or whatever redraws a window from tiny to small to
create some neat-o effect.  So, maybe if there is a delay in loading and the
settings restores the window size later than usual, maybe there is a thread
clash of what the Window Manager is doing and what Octave GUI window resize is
doing.

If you can make this problem more common than once every one or two days
(which is what I see), it might lead to a route of investigation.  Perhaps
Torsten could give simple instructions for a line to comment out so that the
Octave GUI does not restore settings at start up, then you build and try to
repeat the start-up crashes on FreeBSD; if the crashes go away, that could be
a lead.

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