Emacs aborts & dumps core in mark_object under Tru64 v.5.0

[Jeremy H. Brown]

In GNU Emacs 20.7.1 (alphaev56-dec-osf5.0, X toolkit)
 of Mon Jan 22 2001 on suspiria.ai.mit.edu

Emacs build from virgin source,  configured with
./configure

The bug is a heisenbug: occasionally emacs just silently dumps core
and goes away.  I haven't figured out how to reproduce the bug
reliably; if/when I do, I'll send in more detail on it.

Poking around the corefile with gdb, I find that abort() is being
called by mark_object in alloc.c when the big switch statement that
makes up most of the loop falls through to the default abort() case
because obj is not a recognized elisp type.  (At the time, obj =
9223372036854775807, for what little that's not worth, but perhaps the
type bits are interesting to you.)

Jeremy