From: "Andreas Röhler" <andreas.roehler@easy-emacs.de>
To: 21629@debbugs.gnu.org
Subject: bug#21629: 25.0.50; python.el freezes up around docstrings.
Date: Thu, 08 Oct 2015 16:27:54 +0200 [thread overview]
Message-ID: <56167D6A.5070507@easy-emacs.de> (raw)
In-Reply-To: <83fv1oxd2v.fsf@gnu.org>
Am 06.10.2015 um 16:54 schrieb Eli Zaretskii:
>> From: Jacob MacDonald <jaccarmac@gmail.com>
>> Date: Tue, 06 Oct 2015 04:48:50 +0000
>>
>> Begin from a fresh 'emacs -Q'. Create a Python file. Insert a long
>> docstring which contains a header line and then a long body which
>> includes a few line breaks and spaces in it. The docstring should look
>> something like this:
>>
>> """test header
>>
>> lorem ipsum... more text more text more text
>> x10 lines
>> ...
>> ...
>> """
>>
>> Save the file and close emacs. Start a fresh 'emacs -Q'. Open dired in
>> the directory which contains the Python file you created. Navigate to
>> the file and try to open in from dired. Emacs will freeze indefinitely
>> and eat all the system resources it can. You can break the cycle by
>> pressing C-q many times, but the freeze happens again on every single
>> redisplay. If you wait awhile before cancelling the redisplay, you may
>> see that fontification has frozen somewhere in the middle of the docstring.
> It infloops in python-nav-end-of-statement. The loop there ends up
> one position before EOB, then jumps back to string-start, and so on
> and so forth, ad nauseam.
>
> I have no idea what causes this, but I hope Python-mode experts and
> perhaps Stefan (due to syntax stuff) will be able to figure this out.
>
>
>
>
With a while-loop reading complex conditions IMO there is always an
abstract danger.
python-mode.el uses a heuristic exit:
`py-max-specpdl-size' - default is `max-specpdl-size'
next prev parent reply other threads:[~2015-10-08 14:27 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-06 4:48 bug#21629: 25.0.50; python.el freezes up around docstrings Jacob MacDonald
2015-10-06 14:54 ` Eli Zaretskii
2015-10-08 14:27 ` Andreas Röhler [this message]
2015-10-08 18:22 ` Luke Powers
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