GNU bug report logs - #61000
emacs-28.2 hangs on displaying ill-formed python source

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#61000: closed (emacs-28.2 hangs on displaying ill-formed
 python source)
Date: Thu, 26 Jan 2023 08:05:02 +0000

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Your message dated Thu, 26 Jan 2023 10:04:13 +0200
with message-id <83sffxen7m.fsf <at> gnu.org>
and subject line Re: bug#61000: emacs-28.2 hangs on displaying ill-formed python source
has caused the debbugs.gnu.org bug report #61000,
regarding emacs-28.2 hangs on displaying ill-formed python source
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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61000: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=61000
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From: Yoichi Nakayama <yoichi.nakayama <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: emacs-28.2 hangs on displaying ill-formed python source
Date: Sun, 22 Jan 2023 16:21:02 +0900

Hi,
I found Emacs-28.2 becomes inoperable (hangs at 100% CPU usage)
when displaying certain ill-formed Python source code.

How to reproduce:
(1) prepare python source file
https://raw.githubusercontent.com/sqlfluff/sqlfluff/6071b70ef6a46b19141495ee8d38b41b27750b2c/src/sqlfluff/dialects/dialect_snowflake.py
(2) open it by "emacs -Q dialect_snowflake.py"
(3) jump to line 767 by "M-g g 767 RET".
(4) remove closing triple quotes by "C-k"

class FunctionNameSegment(ansi.FunctionNameSegment):
    """Function name, including any prefix bits, e.g. project or schema.
    Overriding FunctionNameSegment to support Snowflake's IDENTIFIER
pseudo-function.
    """ <== remove this triple quote


I also verified the following:
* The problem doesn't occur with Emacs-28.1
* The problem doesn't occur when I load lisp/progmode/python.el
before 1b77362 between step (2) and (3).
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=1b7736277114bf91012b817a4e2557625b7340a5

> commit 1b7736277114bf91012b817a4e2557625b7340a5
> Author: Lars Ingebrigtsen <larsi <at> gnus.org>
> Date:   Mon Apr 18 13:17:32 2022 +0200
>
>     Avoid hangs in python-mode with debug-on-error set
>
>     * lisp/progmodes/python.el (python-nav-end-of-statement): Avoid
>     using cl-assert here, because this is called from the font-lock
>     machinery, and if debug-on-error is set here, we'll hang Emacs
>     (bug#54996).
>
>     Do not merge to master.

Thanks,
-- 
Yoichi NAKAYAMA

[Message part 3 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: yoichi.nakayama <at> gmail.com
Cc: 61000-done <at> debbugs.gnu.org
Subject: Re: bug#61000: emacs-28.2 hangs on displaying ill-formed python source
Date: Thu, 26 Jan 2023 10:04:13 +0200

> Cc: 61000 <at> debbugs.gnu.org
> Date: Sun, 22 Jan 2023 12:53:09 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> Thanks, I can reproduce this in Emacs 28.2, but not on what will be
> soon Emacs 29.1.  So I guess the fact that we didn't merge the above
> "fix" to master avoids the problem in Emacs 29.
> 
> So I think this problem is limited to Emacs 28.2, and we don't have to
> do anything about it, since we don't plan any additional releases from
> the emacs-28 branch.

No further comments in a week, so I'm closing this bug as fixed.

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