KNOWN BUGS
==========

After end of 4.19-stable maintainance, CIP project maintains 4.19 kernel
tree. We try to fix as many bugs as possible, but sometimes backport
from mainline is not feasible or not done by the stable team, and
sometimes backport from 4.9-stable+ to 4.4-st is not feasible or not
done for other reasons.

In major cases this happens, we'll try to add notes here. Detailed
per-patch status is available at
git@gitlab.com:cip-project/cip-kernel/lts-commit-list.git file
v4.19.org, or can be pulled from git history.

4.19.325-cip126-rt45 cgroup conflict
------------------------------------

During creation of 4.19.325-cip126-rt45, there was conflict between
changes in -cip126 and the realtime tree. Essentially -rt rewrote
cgroup handling in commit 8990cf9c6a "cgroups: use simple wait in
css_release()" while -cip now contains commit 79f919a89c "cgroup:
split cgroup_destroy_wq into 3 workqueues". We currently don't know
how to fix the conflict (or how to test the result), so we reverted
79f919a89c in the 4.19.325-cip126-rt45. 79f919a89c is also known as
CVE-2025-39953.
