[Octave-bug-tracker] [bug #54656] Crash with signal 11 (segfault)

[John W. Eaton]

Follow-up Comment #7, bug #54656 (project octave):

I tested with 4.4.1.  Yes, it seems related to clearing symbols while a script
is executing.  I can trigger the crash with this script:


a = ones (10000000, 1);
b = sort (a);
clear a;
b = [];
a = ones (1048576, 1);
b = sort (a);


Doesn't crash with the dev version, but you are right that it doesn't mean
that the issue is really fixed.  Probably we are just avoiding it.  I'm
guessing the real problem is that the GUI might access the contents of a
symbol_scope object while it is being modified.  So we may need some locking,
or a copy-on-write mechanism for this use case(?), or we need to avoid 
passing symbol scope objects directly to the interpreter and only pass summary
info about them.

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