bug#44293: 26.3; Emacs crashes when sending a message through the telega package

[Eli Zaretskii]

> Date: Wed, 28 Oct 2020 19:01:14 +0000
> From: richard.baeck--- via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> My emacs crashed when I started the package telega (installed from
> melpa). It uses an external lib which is linked against the Telegram
> tdlib. Everything compiled succesfully with the latest tdlib sources (I
> compiled tdlib manually too).
> 
> I am using Spacemacs as my config.
> 
> Btw when I start Emacs without X support (emacs -nw) it does not crash.
> Even using the Emacsclient without X does not crash my Emacs session.
> 
> This is what the backtrace says:
> 
> 0x00007ffff0ec49a5 in raise () from /lib64/libpthread.so.0
> (gdb) bt
> #0  0x00007ffff0ec49a5 in raise () at /lib64/libpthread.so.0
> #1  0x00000000004ffc4d in terminate_due_to_signal ()
> #2  0x000000000051a569 in  ()
> #3  0x000000000045dc56 in redisplay_internal ()
> #4  0x00000000004603dd in redisplay_preserve_echo_area ()
> #5  0x00000000005be760 in Fdelete_process ()
> #6  0x00000000005c676d in kill_buffer_processes ()
> #7  0x00000000004ffa26 in shut_down_emacs ()
> #8  0x00000000004cbabd in x_connection_closed ()
> #9  0x00000000004cf998 in x_error_quitter.isra ()
> #10 0x00000000004cfa2e in x_error_handler ()
> #11 0x00007ffff6ec443b in _XError () at /lib64/libX11.so.6
> #12 0x00007ffff6ec11a7 in handle_error () at /lib64/libX11.so.6
> #13 0x00007ffff6ec1245 in handle_response () at /lib64/libX11.so.6
> #14 0x00007ffff6ec1b92 in _XEventsQueued () at /lib64/libX11.so.6
> #15 0x00007ffff6eb3491 in XPending () at /lib64/libX11.so.6
> #16 0x00007ffff769e19f in gdk_event_source_prepare () at /lib64/libgdk-3.so.0
> #17 0x00007ffff7041dea in g_main_context_prepare () at /lib64/libglib-2.0.so.0
> #18 0x00007ffff704279b in g_main_context_iterate.isra () at 
> /lib64/libglib-2.0.so.0
> #19 0x00007ffff704293c in g_main_context_pending () at /lib64/libglib-2.0.so.0
> #20 0x00007ffff79834c2 in gtk_events_pending () at /lib64/libgtk-3.so.0
> #21 0x00000000004cc4fd in XTread_socket ()
> #22 0x0000000000507052 in gobble_input ()
> #23 0x0000000000507655 in process_pending_signals ()
> #24 0x00000000005eed63 in xftfont_open ()

Sounds like bug#37786.  Can you upgrade to Emacs 27.1? this bug is
supposed to be fixed there.  Alternatively, you could apply the patch
here:

  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=37786#46

and rebuild Emacs.