bug#35961: 27.0.50; Sometimes frame freezes and stops updating (almost entirely)

[Dmitry Gutov <dgutov@yandex.ru>]

On 28.05.2019 21:41, Eli Zaretskii wrote:
>> From: Dmitry Gutov <dgutov@servers.com>
>> Date: Tue, 28 May 2019 18:06:44 +0300
>>
>> - Creating a new frame with 'C-x 5 2'. The result is a responsive frame,
>>     all the while the previous one is in that weird state.
> 
> This bit almost certainly means that it's not an Emacs problem, but
> something related to the other software on your system. 

That's possible, actually. I've had another program (a terminal 
emulator) show similar behavior. I'm using a somewhat outdated desktop 
environment (Unity 7), so there might be some bugs in its windowing 
code. A reboot usually solves the problem for a while.

> Emacs's
> display engine updates all the frames one after the other, in a single
> thread, so the situation where one frame is updated, but another
> isn't, is simply impossible, as far as the Emacs code is concerned.

Having said the above, surely there is also some code that passes the 
rendered frame contents to the windowing system, or the graphical toolkit?

> Did you try looking at your system's logs for the times when these
> freezes happen?  Or search the Internet for similar reports, not
> necessarily related to Emacs?

I will try, thank you.