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From: Philipp Stephani
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Subject: bug#45541: 28.0.50; Frequent crashes on ARM macOS
Date: Wed, 30 Dec 2020 15:49:11 +0100
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To: Alan Third , Philipp Stephani ,
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Am Mi., 30. Dez. 2020 um 15:42 Uhr schrieb Philipp Stephani
:
>
> Am Mi., 30. Dez. 2020 um 15:05 Uhr schrieb Alan Third :
> >
> > On Wed, Dec 30, 2020 at 02:01:18PM +0100, Philipp Stephani wrote:
> > > Am Mi., 30. Dez. 2020 um 01:10 Uhr schrieb Alan Third :
> > > >
> > > > On Tue, Dec 29, 2020 at 11:32:43PM +0100, Philipp wrote:
> > > > >
> > > > > With an Emacs built from the emacs-27 branch I get frequent crashes on
> > > > > ARM64 macOS (Big Sur). I haven't managed to produce an Elisp stacktrace
> > > > > yet, but here's the crash report:
> > > >
> > > > > Looks like a crash in ns_mouse_position.
> > > >
> > > > Can you check that the build includes this?
> > > >
> > > > 6aa9fe3e1b4052b2acde86404a90e35893ebfa00?
> > > > Fix crash in ns_mouse_position (bug#44313)
> > >
> > > Yes, according to "git branch --contains" the commit is present. The
> > > exception report makes me think that NSApp is null or invalid, but how
> > > should that be possible?
> >
> > I have no idea... What's happening when the crash occurs? I take it
> > the mouse is being moved, but are frames opening and closing or
> > anything?
>
> I'm now able to reproduce this consistently. It happens when a tooltip
> appears and you hover over that tooltip (try M-x locate and move the
> mouse around).
> The crash is in the line
> if (f && FRAME_NS_P (f))
> in nsterm.m in ns_mouse_position, so apparently "f" is not NULL, but
> also not valid.
Looks like "f" isn't initialized to NULL in that function?