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bug#30931: 27.0.50; Crash in "Automatic GC"

From: Michał Kondraciuk
Subject: bug#30931: 27.0.50; Crash in "Automatic GC"
Date: Thu, 29 Mar 2018 17:52:49 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

I was able to reproduce crash in the same place in bare Emacs versions 27.0.50, 25.3, 24.4 with the form below.

  (defun on-overlay-modification (&rest args)
    (push nil buffer-undo-list))

  (defun crash ()
      (narrow-to-region 1 1)

      (let (end)
        (insert " 123aaa")
        (narrow-to-region 2 3)

        (setq end (set-marker (make-marker) 3))


        (overlay-put (make-overlay end (1+ end))
                     'modification-hooks '(on-overlay-modification)))))

  (with-current-buffer "*scratch*"
    (let ((buffer-undo-list t))
      (while t

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