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bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list
From: |
Michael Heerdegen |
Subject: |
bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list |
Date: |
Sat, 06 Mar 2021 01:51:00 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
martin rudalics <rudalics@gmx.at> writes:
> > I tried it now. The only thing I can say is that with Emacs 27 it
> > usually returns 0 or 1 here while with master it returns 10. So maybe
> > you should try (after verifying what I found out) to trace the recent
> > changes in master.
>
> The "it" above is `count-markers-in-buffer-undo-list'. And with "trace"
> I really meant "bisect". But make sure to check first what I said about
> the Emacs 27 behavior - YMMV.
I cannot confirm that, no. I can reproduce the issue in a newly built
Emacs 27 as well as in the 27 that comes with Debian. "It" again being
`count-markers-in-buffer-undo-list'.
My question is what amount of that is pathological. A lot of code
creates markers "on the fly", a lot, e.g. jit-lock or yank (push-mark)
or display-buffer. When undo is performed before gc is run, they end in
buffer-undo-list.
Does making a marker point to nil with `set-marker' then make it
suitable for garbage collection? I guess not.
My observation: if I set undo-buffer-list to nil after reproducing the
issue, `count-markers-in-buffer-undo-list' reports "0" afterwards. So I
wonder whether what we see is maybe normal business and an unfortunate
side effect of undo recording marker positions and gc running not often
enough to prevent these accidents?
I can continue testing with emacs-26 if you want.
Regards,
Michael.
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, Michael Heerdegen, 2021/03/03
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, martin rudalics, 2021/03/04
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, Michael Heerdegen, 2021/03/04
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, martin rudalics, 2021/03/04
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, Michael Heerdegen, 2021/03/04
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, martin rudalics, 2021/03/05
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, martin rudalics, 2021/03/05
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list,
Michael Heerdegen <=
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, Eli Zaretskii, 2021/03/06
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, Michael Heerdegen, 2021/03/06
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, martin rudalics, 2021/03/06
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, Michael Heerdegen, 2021/03/06
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, Michael Heerdegen, 2021/03/07
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, martin rudalics, 2021/03/08
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, Michael Heerdegen, 2021/03/08
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, Michael Heerdegen, 2021/03/08
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, martin rudalics, 2021/03/09
- bug#46908: 28.0.50; Dozens of spurious markers in buffer-undo-list, Michael Heerdegen, 2021/03/09