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emacs-28.2; win 11

$ emacs -Q
  1. If I use most-positive-fixnum:

    (lossage-size most-positive-fixnum)
    

    Emacs will emit: Value must be >= 100 in the echo area.

  2. If I use a modest number:

    (lossage-size (/ most-positive-fixnum 10))
    

    Emacs will crash immediately.

I just want to use most-positive-fixnum to indicate that I won't limit the size of lossage.

1 Answer 1

1
  1. If Emacs crashes then there's a bug in Emacs (in its C code). Do M-x report-emacs-bug immediately, in particular providing a recipe that starts with emacs -Q (no init file).

  2. I tried emacs -Q followed by (lossage-size (/ most-positive-fixnum 10)) in Emacs 28.2 on MS Windows, and it didn't crash. It simply returned this value: 858993459.

  3. Raising an error for (lossage-size most-positive-fixnum) seems like a bug, to me. Certainly the value of most-positive-fixnum is at least 100. You might want to report this.


You apparently reported this as Emacs bug#62277, and as a result it's now been fixed for the upcoming Emacs 29 release. Thanks!

4
  • Did you watch the memory usage ? The memory of my Emacs increased fast when eval (lossage-size (/ most-positive-fixnum 10)).
    – summertime
    Commented Mar 19, 2023 at 16:56
  • That's not a crash. And after it returned - or even if you used C-g to interrupt its evaluation - did you try evaluating it again?
    – Drew
    Commented Mar 19, 2023 at 16:59
  • No, I cannot try again during the same session because my Emacs just crashed, then a window (here window is a window in MS-Windows) popped up (asking me whether to debug emacs.exe). I don't why the memory usage will increase.
    – summertime
    Commented Mar 19, 2023 at 17:04
  • 1
    Report the problem you see: M-x report-emacs-bug, whether it's actually a crash or something different.
    – Drew
    Commented Mar 19, 2023 at 17:07

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