GNU bug report logs - #24678
Emacs crash on macOS 10.12 "Sierra": nextEventMatchingMask from background thread

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Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Jean de Largentaye <jlargentaye <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: Emacs crash on macOS 10.12 "Sierra": nextEventMatchingMask from
 background thread
Date: Wed, 12 Oct 2016 19:46:42 +0000

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This is Emacs 25.1 installed via MacPorts on macOS 10.12.

This happens randomly but very frequently. I'm told that a reliable way to
reproduce it is to resize the window while mashing C-g.


On Wed, Oct 12, 2016 at 12:44 PM Jean de Largentaye <jlargentaye <at> gmail.com>
wrote:

> crashing in org.gnu.Emacs in deliver_fatal_thread_signal • Uncaught
> Exception 'NSInternalInconsistencyException': nextEventMatchingMask should
> only be called from the Main Thread!terminating with uncaught exception of
> type NSException : at com.apple.AppKit in -[NSApplication(NSEvent)
> shouldBeTreatedAsInkEvent:] + 0
>
> Apparently, calling nextEventMatchingMask from a background thread is
> risky, and this has been made an assert as on 10.12, hence the crash.
>

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