GNU bug report logs - #41357
28.0.50; GC may miss to mark calle safe register content

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Message #35 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Andrea Corallo <akrl <at> sdf.org>
Cc: bug-gnu-emacs <at> gnu.org, eggert <at> cs.ucla.edu
Subject: Re: 28.0.50; GC may miss to mark calle safe register content
Date: Sun, 17 May 2020 20:22:58 +0300

> From: Andrea Corallo <akrl <at> sdf.org>
> Cc: bug-gnu-emacs <at> gnu.org, eggert <at> cs.ucla.edu
> Date: Sun, 17 May 2020 17:13:26 +0000
> 
> If a C function caller of 'flush_stack_call_func' allocates a
> Lisp_Object in a temp variable and the compiler decide to keep this in a
> callee saved reg while 'flush_stack_call_func' is called this will be
> garbage collected unexpectedly.

Can you show me an example of this (as skeleton C code)?

Thanks.

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