Issue #633 has been updated by Ed Borasky.

File ruby-segfault.log added
File ruby-c-backtrace.txt added

OK ... I have a core dump file and a C level traceback with "gdb". I've attached the files, rather than putting the details in line. Enough stuff was "optimized out" that I think I'm going to recompile with "-O0" (no optimization) and see if that helps / makes it go away / makes it easier to find.
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