[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#39343: 27.0.50; Thrad signal crashes Emacs with sgmentation fault
From: |
Alan Third |
Subject: |
bug#39343: 27.0.50; Thrad signal crashes Emacs with sgmentation fault |
Date: |
Wed, 29 Jan 2020 20:42:34 +0000 |
On Wed, Jan 29, 2020 at 12:27:19PM +0100, Christian Johansson wrote:
> Running following works on Linux but not on macOS.
>
> (let ((loop t)
> (iterations 1))
> (while loop
> (make-thread
> (lambda()
> (message "Thread %d" iterations)
> (signal 'error (list "My error"))))
> (setq iterations (1+ iterations))))
>
> Error in console: Fatal error 11: Segmentation faultAbort trap: 6
>
> It seems to be some kind of issue with quitting threads on macOS which is
> not present on Linux
It’s a stack overflow caused by the main thread getting stuck in a
loop processing calls to ns_send_appdefined which must be coming from
the 2000‐odd threads the script starts.
Presumably it’s the call to ns_run_loop_break in sys_cond_broadcast
that’s doing it.
I don’t think there’s really any way round this other than the massive
rewrite the NS port needs to make it handle threads correctly.
--
Alan Third