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bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in

From: Amin Bandali
Subject: bug#44506: 28.0.50; Segfault on opening a particular message in Gnus in terminal/tty
Date: Sat, 07 Nov 2020 15:03:53 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Eli Zaretskii writes:

>> 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"?

It does not indeed.  With -Q, visiting the message body saved into a
regular text file or opening the actual message using Gnus does not
result in a segfault.

After some bisecting of my config files, I narrowed the segaulting of
Gnus when opening that message down to inclusion of (require 'ebdb-gnus)
in my configs.  ebdb-gnus is part of EBDB, available on GNU ELPA.  I'm
Cc'ing Eric, EBDB's creator and maintainer, in case he might have any

>> #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?

GDB's source display does indeed highlight that line for me.  Is this
the confirmation you were looking for, or did you mean I should look
into disabling optimization and *then* run Emacs through GDB to collect
the backtrace?

Thanks for your help.

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