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bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in
From: |
Eli Zaretskii |
Subject: |
bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty |
Date: |
Sat, 07 Nov 2020 20:58:46 +0200 |
> From: Amin Bandali <bandali@gnu.org>
> Date: Sat, 07 Nov 2020 13:39:14 -0500
>
> I noticed today that when trying to open the following message (attached
> with John's permission) using Gnus in a terminal emulator or a tty in
> GNU/Linux, it results in Emacs quitting with a segfault. I'm also
> attaching the result of running `bt full' in GDB after the segfault.
> The issue seems related in part to the inclusion of Persian characters
> in the message body.
Just visiting the text you send in "emacs -Q -nw" doesn't cause any
segfaults. Does it happen to you in "emacs -Q"?
> #0 0x0000555555639248 in encode_terminal_code (src=0x7ffff7f61cc0,
> src_len=src_len@entry=1, coding=coding@entry=0x555555e7ec00) at term.c:564
> cmp = 0x0
> gstring = 0x0
> i = <optimized out>
> src_end = 0x7ffff7f61cf0
> buf = 0x5555561483a0 ' ' <repeats 94 times>, "John ،متسود یسر", '-'
> <repeats 39 times>
> nchars = 0
> nbytes = 0
> required = <optimized out>
> tbase = 0x0
> charset_list = 0x7fffea1f724b
This is an optimized build, so it's hard to understand what caused the
crash. According to the line number, it crashes here:
if (src->u.cmp.automatic)
{
gstring = composition_gstring_from_id (src->u.cmp.id);
required = src->slice.cmp.to - src->slice.cmp.from + 1;
}
else
{
cmp = composition_table[src->u.cmp.id]; <<<<<<<<<<<<<<<
required = cmp->glyph_len;
}
If that is true, then I don't understand how it happened: we don't use
any compositions except automatic in Emacs, so I'm unsure how you get
to that place. Can you see which place in the code indeed crashes and
why?
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Amin Bandali, 2020/11/07
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty,
Eli Zaretskii <=
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Amin Bandali, 2020/11/07
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Eli Zaretskii, 2020/11/07
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Eric Abrahamsen, 2020/11/07
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Eli Zaretskii, 2020/11/08
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Amin Bandali, 2020/11/08
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Eli Zaretskii, 2020/11/08
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Eli Zaretskii, 2020/11/08
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Amin Bandali, 2020/11/08
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Eli Zaretskii, 2020/11/08
- bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty, Amin Bandali, 2020/11/08