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bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-m

From: Noam Postavsky
Subject: bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data
Date: Fri, 20 Mar 2020 04:37:49 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.90 (gnu/linux)

tags 40088 + patch

Stefan Monnier <address@hidden> writes:

>> Since the void-variable is getting triggered from
>> backtrace_eval_unrewind, I tried the patch below, which almost seems
>> to fix the problem,
> Indeed, the patch looks good (except for the removal of `static` which
> seems like a spurious artifact).

No, the removal is on purpose, because I'm calling default_value from
eval.c, and it's defined in data.c.  But, maybe you thought that because
I didn't add the corresponding declaration in a header file, and...

>> but after continuing from the debugger there's a
>> segfault in GC, so it's definitely not the Right Thing.

... the segfault happens because I forgot to declare default_value in
lisp.h, so its return value got converted to int.  *Forehead slap*

So here's the proper patch.  Eli, is it okay for emacs-27?  As I
mentioned earlier, the underlying bug was present in Emacs 26 and
earlier, but it's only surfaced in Emacs 27 because of debug.el

Attachment: 0001-Don-t-signal-during-backtrace-unrewind-Bug-40088.patch
Description: patch

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