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bug#34059: 27.0.50; Emacs hangs on typing quit (MS-Windows)


From: Richard Copley
Subject: bug#34059: 27.0.50; Emacs hangs on typing quit (MS-Windows)
Date: Mon, 14 Jan 2019 19:39:07 +0000

On Mon, 14 Jan 2019, 15:40 Eli Zaretskii <address@hidden wrote:
> From: Richard Copley <address@hidden>
> Date: Sun, 13 Jan 2019 16:00:23 +0000
> Cc: address@hidden
>
> On Sun, 13 Jan 2019 at 15:17, Eli Zaretskii <address@hidden> wrote:
> >
> > > From: Richard Copley <address@hidden>
> > > Date: Sun, 13 Jan 2019 13:04:05 +0000
> > >
> > > Emacs sometimes hangs on typing quit, on MS-Windows.
> >
> > Thanks, but if you can, please provide more details about what was
> > Emacs doing when this happens.
>
> I'm not sure exactly, sorry. I would have been reading console output
> from a process in a compilation-mode buffer, and using git via magit,
> around the time.

Any chance you could recollect why did you type C-g while at that?

Not really. I had invoked M-x recompile, and didn't immediately see
results in the compilation-mode buffer. That's not a compelling reason
to type C-g so I suppose I had done something else too.

The file I was editing/compiling wasn't saved (I recovered it from a
stale autosave later). I don't remember whether I saw the "Save file
%s? (...)" question, nor whether I had answered it if so. (I mention
this in case it's a useful clue. Probably not.)

> The message says "I'll send another report if and when I catch another hang".

I've found one, possibly two more places where we could QUIT while
holding a critical section.  I cannot know if they were part of your
hang, but I went ahead and fixed them on the emacs-26 branch.  Let's
see if they stop these hangs from happening.

Great, thanks. Let's see.


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