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bug#28630: 27.0.50; C-g while a non-main thread is sitting crashes Emacs


From: Alex
Subject: bug#28630: 27.0.50; C-g while a non-main thread is sitting crashes Emacs
Date: Sat, 30 Sep 2017 21:18:08 -0600
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Alex <address@hidden> writes:

> Evaluate the following in emacs -Q:
>
> (make-thread
>  (lambda ()
>    (message "hello")
>    (sit-for 2)
>    (message "there")))
>
> Executing C-g before this finishes crashes Emacs. Here's a backtrace:
> [...]

Should this be labelled a blocker for Emacs 26? This appears to be a
related to bug 25214, since I just tried to hit C-g when running the
example there and it indeed crashes Emacs.

It should be noted that `keyboard-escape-quit' (ESC ESC ESC) doesn't
crash Emacs.

Also, replacing (sit-for 2) with (read-char) or its family and hitting
C-g will also crash Emacs.





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