bug#55371: 29.0.50; lock-up in redisplay_internal

[Michael Welsh Duggan]

Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@gnu.org> writes:

> Michael Welsh Duggan <mwd@md5i.com> writes:
>
>>     at ../sysdeps/unix/sysv/linux/poll.c:29
>>         sc_ret = -516
>>         sc_cancel_oldtype = 0
>> #1  0x00007ffff362ad02 in  () at /lib/x86_64-linux-gnu/libxcb.so.1
>> #2  0x00007ffff362d05a in xcb_wait_for_event ()
>>     at /lib/x86_64-linux-gnu/libxcb.so.1
>> #3  0x00007ffff79f10a8 in _XReadEvents () at 
>> /lib/x86_64-linux-gnu/libX11.so.6
>> #4  0x00007ffff79d8214 in XIfEvent () at /lib/x86_64-linux-gnu/libX11.so.6
>> #5  0x00007ffff7a211ef in  () at /lib/x86_64-linux-gnu/libX11.so.6
>> #6  0x00007ffff7a21ca2 in  () at /lib/x86_64-linux-gnu/libX11.so.6
>> #7  0x00007ffff7a21f1d in _XimRead () at /lib/x86_64-linux-gnu/libX11.so.6
>> #8  0x00007ffff7a10afb in  () at /lib/x86_64-linux-gnu/libX11.so.6
>> #9  0x00007ffff79fe4ad in XSetICValues () at 
>> /lib/x86_64-linux-gnu/libX11.so.6
>
> This is suspiciously similar to the last bug you reported, but that was
> about random lockups when using GNOME Shell.
>
> Would you please install debuginfo and the source code packages for
> Xlib, and show exactly which call `XIfEvent' is causing the lockup?

Okay.  Attempting this.  I have no idea when this might trigger again,
so this bug might have to sit for a while.

-- 
Michael Welsh Duggan
(md5i@md5i.com)