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bug#32812: 27.0.50; macOS Mojave GNU Emacs crash after 5-10 minutes or s

From: Alan Third
Subject: bug#32812: 27.0.50; macOS Mojave GNU Emacs crash after 5-10 minutes or so
Date: Mon, 24 Sep 2018 11:17:06 +0100
User-agent: Mutt/1.10.1 (2018-07-13)

On Sun, Sep 23, 2018 at 04:21:13PM +0100, Zack Piper wrote:
> Hi!
> (Replacing my post in #31904 with this since they're separate issues(?))

Sorry, I somehow missed that previous email.

> I've applied a slightly modified (i.e. updated) version of Alan's patch from
> bug #31904
> (attached) to fix an issue concerning the buffer and mode-line not being
> rendered. The patch works great, everything is now rendered.
> Now I notice that after 5-10 minutes (or even before), Emacs crashes with
> the below:
> ```
> objc[82784]: Invalid or prematurely-freed autorelease pool 0x1030032e0.
> ```
> This started occurring since upgrading to macOS Mojave, so possibly there's
> a bug with Mojave or just some incompatibility, not really sure!

It’s a bit strange looking, and autorelease pools are something of a
mystery to me.

I have a suspicion, though, that just creating a new autorelease pool
may solve this. I’ve attached a patch. It’s for emacs-26, but should
apply OK to master, or without too much work anyway.

It simply wraps the call to displayIfNeeded in a new pool:

static void
ns_flush_display (struct frame *f)
/* Force the frame to redisplay.  If areas have previously been marked
   dirty by setNeedsDisplayInRect (in ns_focus), then this will call
   draw_rect: which will "expose" those areas.  */
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  [FRAME_NS_VIEW (f) displayIfNeeded];
  [pool release];

Thanks for testing the patch and raising this issue. There’s not been
a lot of feedback so far and I think we’re going to have to commit the
patch soon given that Mojave is out today.
Alan Third

Attachment: 0001-Fix-crash-when-flushing-to-screen-bug-32812.patch
Description: Text document

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