Re: Possible regression (full crash of X)

On Mon, May 29, 2017 at 03:05:16AM +0000 I heard the voice of
Yumekui Neru, and lo! it spake thus:
>
> I have been experiencing crashes (relatively) recently, and after
> quite some trial and error, my ctwm install appears to at the very
> least be part in it

Alright, well...

> ctwm: /var/tmp/portage/x11-wm/ctwm-9999/work/ctwm-9999/otp.c:249:
> OtpCheckConsistencyVS: Assertion `PRI(owl) >= priority' failed.

That's the internal consistency checking in the OTP code blowing up
because things aren't in the order we expect them in.  Which means
that something in

>   Land some fixups of OTP and EWMH interaction.
>   e5ea26e47445acb24f153b3d422209e809babce0

is indeed the likely cause.  So some code elves obviously snuck in and
changed something before I landed that branch (the alternative being
that I screwed something up, which is patently ridiculous).

Assertion failure would mean ctwm aborting, which would mean X exiting
if ctwm were the last thing running out of .xinitrc or whatever
(common config).  So from the X perspective, it's not really a
"crash", just ctwm exiting.


> (the window attempts to fill the screen, and pretty much immediately
> crashes to the linux terminal I launched ctwm from).

That at least vaguely suggests it may be the EWMH FULLSCREEN stuff
that's immediately triggering it.  Wine sadly sounds like a good
candidate for doing something screwy with its window[s] too   :(.  On
the plus side, that particular set of consistency checks are all
internal, so it doesn't seem like it's necessary something it's doing
with the X server behind our back, which makes things simpler.

I've got apps using FULLSCREEN with fair regularity here, and I've
been running that code since [before] it landed on trunk without
issue, so there's something at least a _little_ subtle going on.  I
did manage to trip an assertion once in mid-dev, but I'm pretty sure
that was when I was halfway through some changed and I never
reproduced it.  Are you using any OnTopPriority or AlwaysOnTop config
entries, or any of the f.setpriority/etc functions?



-- 
Matthew Fuller     (MF4839)   |  [email protected]
Systems/Network Administrator |  http://www.over-yonder.net/~fullermd/
           On the Internet, nobody can hear you scream.