GNU bug report logs -
#32523
27.0.50; Emacs hangs when killing rectangle
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Reported by: Joseph Mingrone <jrm <at> ftfl.ca>
Date: Sat, 25 Aug 2018 01:01:01 UTC
Severity: normal
Merged with 3219,
4123,
9589,
13675,
15555,
18530,
22143,
24523,
30457,
40007
Found in versions 23.1, 24.2, 24.2.93, 24.3, 24.5, 26.0.91, 27.0.50, 28.0.50
Fixed in version 29.1
Done: Lars Ingebrigtsen <larsi <at> gnus.org>
Bug is archived. No further changes may be made.
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> From: Joseph Mingrone <jrm <at> ftfl.ca>
> Date: Fri, 24 Aug 2018 21:59:48 -0300
>
> Here is a recipe to make Emacs (nearly) hang indefinitely.
>
> 1. emacs -Q
>
> 2. Visit the file found https://ftfl.ca/misc/big_file_hangs_emacs.txt
>
> 3. M-x toggle-truncate-lines
>
> 4. Use rectangle-mark-mode (C-x SPC) to mark the rectangle that starts
> at the top left of the file (point 1), and includes the leading white
> space, the line numbers, and the space after the line numbers (point
> 468848).
>
> 5. Kill the rectangle with C-x r k.
>
> For me, the Emacs process will continue to use 100% CPU and Emacs is
> almost completely unresponsive and has to be killed. Some actions such
> as saving the file may complete, but only after a few minutes.
It doesn't hang, it just takes very long to finish that operation (3
min on my machine with an unoptimized build; should be something like
1 to 1.5 min in an optimized build).
This belongs to the "Emacs is very slow with long lines" class of
problems: the file has 2900-character lines. If this file will never
include any text, I suggest to visit it with
"M-x find-file-literally", then the problem of slowness will go away.
This bug report was last modified 2 years and 298 days ago.
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