Any insight on what targets _endless_loop__ in libcrt0

Hi all,
 
I've got a situation where some logic (running on a 439 MSP430) ends up in
_endless_loop__ which is part of libcrt0. This can happen after the logic
has been happily running some intensive test logic for hours, and I'm trying
to ascertain how it could end up there. The debugger is not giving me a lot
of help (specifically no traceback of how it got here).
 
There is always a possibility that some memory corruption of mine has let
the logic go awol, and by its nature if it hits this logic it will be
trapped here. What I suspect is more likely is that _endless_loop__ is the
deliberate target of an unrecoverable error in one of the C functions (which
itself is no doubt triggered by something I have done!).
 
Can someone who understands the msp C runtime support give me any insights
into the intent behind _endless_loop__, and in what situations it could be
invoked. If I understand this better it may give me some clues where to
look.
 
Thanks, regards, and a great Christmas to all.
 
Andrew

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