Subject: bug#25172: 26.0.50; Concurrency feature, sit-for doesn't work (crashing and unexpected behaviour)

From: Eli Zaretskii <[email-masked]>
Date: Sun, 11 Dec 2016 19:52:56 +0200

> From: Elias Mårtenson <[email-masked]>
> Date: Mon, 12 Dec 2016 00:35:34 +0800
> 
> #2  0x00000000005868ca in emacs_abort () at sysdep.c:2342
> No locals.
> #3  0x000000000057117a in unblock_input_to (level=-1) at keyboard.c:7170
                                              ^^^^^^^^
It aborts because level is negative.  Not sure how this happened.

Can you still see the problem with the current master?  I tried
reproducing this on 2 different systems, and couldn't: it works as
expected for me and doesn't crash.

Thanks.