bug#39962: 27.0.90; Crash in Emacs 27.0.90

[Pip Cet]

On Sun, Mar 22, 2020 at 3:48 PM Pip Cet <pipcet@gmail.com> wrote:
> I've also added more checks for what's one potential erroneous code
> path: corruption of the red-black tree we use in conservative stack
> marking.

In fact I'd added too many checks, which didn't show up in my testing
because I had built things with the wrong configure options. Better
patch attached.

0001-even-more-debugging.patch
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