getting help with bug 86843 - VBA crashing LO with fireChangeEvent

I'm stuck in trying to fix
https://bugs.freedesktop.org/show_bug.cgi?id=86843.

bug summary:  when VBA code makes changes to a textbox value, the
textbox_change() function is triggered and then, especially under linux,
LibreOffice abruptly exits. 

I've reviewed a lot of gdb traces looking for a common failure spot, but
it hasn't gotten me very far.  The code is also very complicated at this
point with broadcasts, and likely listeners- lots of stuff that I am not
understanding and process flow that I can't follow. 

I would appreciate some pointers on how to tackle this kind of problem. 
(I've fixed a few simple bugs in LO so far, but this one is a lot
bigger.)  One possible would be to temporarily remove the
fireChangeEvent from linux builds until the underlying problem is
fixed.  (I don't want to add a regression for platforms where this is
more stable - maybe someone is depending on this "feature" that was
added in 4.1).

Thanks,
Justin