GNU bug report logs - #30874
Displaying char \x274C with Dejavu Sans Mono gives "X protocol error: BadLength (poly request too large or internal Xlib length error) on protocol request 138"

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Message #17 received at 30874 <at> debbugs.gnu.org (full text, mbox):

From: Jan Synacek <jsynacek <at> redhat.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 30874 <at> debbugs.gnu.org
Subject: Re: bug#30874: 27.0.50; Emacs crashes
Date: Thu, 22 Mar 2018 13:28:56 +0100

On Tue, Mar 20, 2018 at 1:44 PM, Eli Zaretskii <eliz <at> gnu.org> wrote:
>> From: Jan Synacek <jsynacek <at> redhat.com>
>> Date: Tue, 20 Mar 2018 13:12:53 +0100
>> Cc: 30874 <at> debbugs.gnu.org
>>
>> > Please show a C-level backtrace from the crash.
>>
>> Since the reproducer is so trivial, I didn't consider it important,
>
> It is always important.  I couldn't reproduce this on my system.
>
>> but there you go (just basic backtrace, the full one is hilariously
>> huge):
>
> Thanks.  Sounds like a duplicate of bug#30045.
>
> Can you run this in X synchronous mode, so that we see which operation
> triggers the original X error?  etc/DEBUG tells how to do that under
> "If you encounter X protocol errors".

I tried the following but it doesn't work:

gdb --args ./src/emacs -Q --eval='(setq x-command-line-resources
"emacs.synchronous: true")' --eval="(switch-to-buffer \"*scratch*\")"
--eval="(insert-char #x274c)" --eval="(set-fontset-font
\"fontset-default\" 'unicode \"Dejavu Sans Mono\")"
--eval="(debug-on-entry 'Fdelete_frame)"

I forgot to mention that this issue is reproducible on the latest
Fedora 27 running gnome and gdm. And as far as I know, I'm not running
wayland.

-- 
Jan Synacek
Software Engineer, Red Hat

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