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bug#38618: 27.0.50; Mach port leak on macOS Catalina causing crash
From: |
Alan Third |
Subject: |
bug#38618: 27.0.50; Mach port leak on macOS Catalina causing crash |
Date: |
Sun, 15 Dec 2019 14:48:27 +0000 |
On Sun, Dec 15, 2019 at 02:35:10PM +1300, Phillip Hutchings wrote:
>
>
> On macOS Catalina (all versions up to and including 10.15.2), after
> opening a file stored on an iCloud Drive folder Emacs leaks Mach ports
> eventually resulting in an Emacs crash during a random syscall.
>
> Reproduction:
> * Using Emacs for MacOS X (currently using Nightly build, but also on
> the 26.3 release from 2019-09-02
> * Open a file stored in an iCloud Drive folder, eg Documents when using
> default settings
> * Modify the file, no need to save it, only modify the contents
> * Emacs will leak Mach ports on every edit.
>
> This does not happen on non-iCloud Drive files, the port count observed
> in Activity Monitor does not change for these files.
>
> So far I've removed all customisations, then tried disabling file
> backups and auto saves, and pretty much anything I can think of that
> accesses files. So far I haven't managed to find a cause.
This sounds strange. I’m not on Catalina, nor do I use icloud, so I
can’t debug this locally.
Can you try enabling NSTRACE (uncomment line 55 in nstrace.h) and then
compare the output when editing a file that doesn’t leak vs one that
does? It might be worth enabling NSTRACE_GROUP_EVENTS too, but it
results in a ton of output, so perhaps try without it first.
Oh, and can you try testing with ‘emacs -nw’, just in case it’s not
related to the window system code.
--
Alan Third