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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Eli Zaretskii <eliz <at> gnu.org> writes:
>> 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.
Thanks for the `find-file-literally' tip.
The rectangle does eventually get cut for me as well. Ignoring speed,
the problem is that Emacs is unusable afterwards. For example, if I go
away for an hour or so, then return, the Emacs process will still be
using something close to 100% CPU and trying to doing something simple,
like moving the point forward, may take minutes.
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This bug report was last modified 2 years and 298 days ago.
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