GNU bug report logs - #41755
feature/native-comp (master?): temacs crash in GC during mark phase

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Package: emacs;

Reported by: Andrea Corallo <akrl <at> sdf.org>

Date: Sun, 7 Jun 2020 19:26:02 UTC

Severity: normal

Done: Andrea Corallo <akrl <at> sdf.org>

Bug is archived. No further changes may be made.

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From: Nicolas Bértolo <nicolasbertolo <at> gmail.com>
To: Pip Cet <pipcet <at> gmail.com>
Cc: Paul Eggert <eggert <at> cs.ucla.edu>, 41755 <at> debbugs.gnu.org, Andrea Corallo <akrl <at> sdf.org>
Subject: bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase
Date: Sun, 7 Jun 2020 16:57:59 -0300

Hi,

I can confirm that what I found was this issue.

> Does it happen for non-optimized builds? Also, what symbol is at
> Lisp_Object value 0xb4f0 (i.e. iQwhatever == 405)?

I haven't been able to reproduce it in non-optimized builds.

What I understand so far is that the GC begins marking the stack of the main
thread and it takes some data in the stack as a pointer to valid Lisp data. It
starts following all the pointers and it eventually SIGSEGVs. I have seen it
crash trying to read symbols, conses and strings.
This bug report was last modified 4 years and 325 days ago.

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