GNU bug report logs - #70423
29.3; cc-mode hang at 100% cpu and consuming all available memory

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From: Dmitry Gutov <dmitry <at> gutov.dev>
To: pillowtrucker <at> proton.me, "70423 <at> debbugs.gnu.org" <70423 <at> debbugs.gnu.org>
Subject: bug#70423: Possible workaround/culprit
Date: Tue, 16 Apr 2024 21:31:18 +0300

On 16/04/2024 18:52, pillowtrucker--- via Bug reports for GNU Emacs, the 
Swiss army knife of text editors wrote:
> I have now filed a bug with hyperbole 
> https://github.com/rswgnu/hyperbole/issues/518 
> <https://github.com/rswgnu/hyperbole/issues/518>, as disabling that 
> package seems to stop the hangs. Not 100% sure if it's their bug or 
> cc-mode now, but I haven't been able to trigger the behaviour since then.

According to your link to the hyperbole repo, it indeed now seems to 
have been caused by it:

https://github.com/rswgnu/hyperbole/blob/master/hui-select.el#L404

It alters defun-prompt-regexp in c++-mode-hook.

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