[Bug guile/17923] scheme exception about invalid object in a backtrace

["mdaniels at lanl dot gov" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17923

--- Comment #6 from Marcus Daniels <mdaniels at lanl dot gov> ---
"for the frame problem, is it possible to set a breakpoint on one of the frame
functions early on, when f_smob->inferior is not NULL, set a watchpoint on it,
and then continue?  When the watchpoint triggers a backtrace may be sufficient
to isolate the culprit."

Could you clarify if there is ever a situation in which f_smob->inferior ought
to become NULL, even if the debugged program is continuing?

For now I'm trying to add guards to frame-* calls using the modified
frame-valid to see what other problems I run into.  If it is an endless chain
of problems, I can't afford to keep debugging and need to take another
approach.  If it is a bounded set, then perhaps I can afford to debug these
issues.

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