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bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects
From: |
Eli Zaretskii |
Subject: |
bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects |
Date: |
Fri, 29 May 2020 13:55:22 +0300 |
> From: Pip Cet <pipcet@gmail.com>
> Date: Fri, 29 May 2020 10:34:20 +0000
> Cc: Paul Eggert <eggert@cs.ucla.edu>, Stefan Monnier
> <monnier@iro.umontreal.ca>, 41321@debbugs.gnu.org
>
> > . There's nothing wrong with GDB's xtype command: it fails when a Lisp
> > object encodes a pointer to invalid memory:
>
> (gdb) p last_marked[497]
> $100 = XIL(0x439c370)
> (gdb) xtype
> Lisp_Vectorlike
> Cannot access memory at address 0x1ffac2a8
>
> Again, that can't be right. $100 is a Lisp_Symbol, not a vectorlike,
> and it's not at address 0x1ffac2a8.
>
> So my suspicion remains that this is a gdb bug, and it appears to be a
> reproducible one!
There's no bug: the $size variable was not updated inside pvectype
because the 'set' command tried to access invalid memory. So the rest
is using the stale value of $size. Puff! no miracle and no bug.
You just don't need to assign too much importance to the address the
error message displays, it might not be the problematic address.
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, (continued)
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Eli Zaretskii, 2020/05/31
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Pip Cet, 2020/05/30
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Eli Zaretskii, 2020/05/30
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Pip Cet, 2020/05/29
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Eli Zaretskii, 2020/05/25
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Pip Cet, 2020/05/25
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Andy Moreton, 2020/05/24
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Pip Cet, 2020/05/24
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Eli Zaretskii, 2020/05/29
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Pip Cet, 2020/05/29
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects,
Eli Zaretskii <=
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Pip Cet, 2020/05/29
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Eli Zaretskii, 2020/05/29
- bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects, Pip Cet, 2020/05/29