Comment 18 for bug 1914044

This fix proved to be too intrusive to be released via focal-updates. It requires an immediate restart of services and a reboot which can't be guaranteed if the fix is included in a later update released into the focal-security pocket.
I'm preparing 2.31-0ubuntu9.4 _without_ this fix but including other fixes which are safe to release to Focal.
In addition to requiring an immediate reboot the fix also breaks snaps bundling glibc without this fix when they are run with an updated core20 snap including this fix.