Re: how to debug gc crashes correlated to arena chunk size

Have you tried running c-find-heap->arena before rewinding?

Something else that may be helpful (for debugging, not in production) is to
call hide-arena/unhide-arena.
The basic technique is to create N times as many arenas as you would
otherwise need.
Whenever you switch to an arena at the outermost point in a task, hide the
most-recently-used arena, pick a new one to use, unhide that one, and use
it.
Any references to any of the hidden arenas will cause a fault that can be
diagnosed.
Take a look at the test named 'arena-use-after-free' in arena.impure for
the idea.

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