[plt-scheme] how to trace a segmentation fault?

Hi all -

I've been experiencing a few segmentation faults lately and not sure what
triggered it.  This is again an intermittent issue (like the previous thread
hanging problem), but I currently have no way to reproduce it yet (the
process runs a job in the background repeatly without human interaction).

Are there ways to determine where the segmentation fault occured as it
occured?
Thanks,
yc
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