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Description of problem:

Customer is trying to adapt to the changes in RHEL 7.8 and therefore is currently testing RHEL 7.8 Beta.
They noticed a new warning is logged in their environment:

    Mar 05 14:31:45 hostname gnome-shell[6493]: STACK_OP_RAISE_ABOVE: sibling window 0x32001e9 not in stack

Version-Release number of selected component (if applicable): 3.28.3-24


How reproducible: Always with their (custom) application.


Steps to Reproduce:
1. Install RHEL 7.8 and run their (custom app)

I wasn't able to reproduce this with a vanilla RHEL 7.8 Beta and "some" applications.

Actual results:
Message - as seen in the description - is logged over and over again.


Expected results:
No message is logged.


Additional info:
I wasn't able to find this code in gnome-shell, but gnome-shell logged it therefore I'm assigning this to gnome-shell, but the code in question is probably in mutter (src/core/stack-tracker.c). Feel free to reassign to mutter, if that make sense.

Since this wasn't logged in RHEL 7.7, I'd say this is a regression; However, if this is hinting that the application is doing something wrong, please also let me know and point me in the right direction.

Customer case will be linked.

I was able to reproduce the error using the c program Jonas provided, with mutter-3.28.3-27.el7 I can no longer trigger the warning.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (GNOME bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:3987