bug#54051: 29.0.50; latest master build with lucid crashes

[A.I.]

Thanks for the information, I'll try read through it and see if I can get
something useful.

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Fri, 18 Feb 2022 11:29:40 +0800
>> From: merrick--- via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>>
>>
>> I can reliably reproduce this issue on my desktop running i3 on X11.
>>
>> 1. run emacs with "emacs -Q"
>> 2. M-x server-start
>> 3. opens a terminal emulator and make it full screen (which covers the
>> emacs frame)
>> 4. run "emacsclient -c"
>> 5. emacs crashes
>>
>> Unfortunately I can't get backtrace from `./src/emacs -q -xrm
>> 'Emacs.synchronous: true' since it hangs forever after doing the above
>> steps.
>
> The file etc/DEBUG in the Emacs source tree has some advice how to get
> control to debugger in the "Getting control to the debugger" section.
> It also has advice for how to investigate hangs in the "If the symptom
> of the bug is that Emacs fails to respond" section.  Please try some
> of that and see what information you can collect.
>
> We need a backtrace from a 'Emacs.synchronous: true' session because
> without that parameter X errors are not reported immediately when a
> faulty X request is sent, but can be delayed by any number of Xlib
> calls.  So the backtrace you produce without 'Emacs.synchronous true'
> is not useful, since it doesn't show us what was the offending Xlib
> call made by Emacs; instead, it shows some unrelated call.
>
> Bottom line: the crucial information we need to investigate this bug
> is which Xlib call in Emacs causes the crash in your case.
>
> Thanks.


--
Thanks.
Merrick Luo