GNU bug report logs - #63589
29.0.91; crash after creating graphical frames via emacsclient when compiled with cairo-xcb

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Message #8 received at 63589 <at> debbugs.gnu.org (full text, mbox):

From: Po Lu <luangruo <at> yahoo.com>
To: Thiago Melo <tmdmelo <at> gmail.com>
Cc: 63589 <at> debbugs.gnu.org
Subject: Re: bug#63589: 29.0.91; crash after creating graphical frames via
 emacsclient when compiled with cairo-xcb
Date: Sat, 20 May 2023 09:46:45 +0800

Thiago Melo <tmdmelo <at> gmail.com> writes:

> emacs: ../../../../src/cairo-xcb-screen.c:219: _get_screen_index:
> Assertion `!"reached"' failed.
>
> Fatal error 6: Aborted
> ```
>
> Affects starting emacs with `emacs -Q --daemon`.
>
> Issue happens since commit de614ec9 ("Use Cairo XCB surfaces when XCB
> is available").

This is one bug.  Thanks for bringing it to our attention.  However,
this crash happens when a display connection is closed, which is not
common in normal use.  As the backtraces you attached show, an unrelated
X error is what caused a connection to be closed.

To really fix this bug, we need to know the details of the X error.
Once you reach the breakpoint on `x_error_quitter', would you please
run:

  (gdb) p *event

and send us the resulting print out?

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