The biggest problem is that it isn't easily disabled because it is hardcoded in
the script instead of being in /etc/apparmor/parser.conf.
Instead of hardcoding, it would had been better to just update that conffile
and let dpkg update it if the user didn't change it (which is highly likely) or
on new installs.
In /lib/apparmor/functions we have this:
# LP: #1383858 - expr tree simplification is too slow for some
# policy on 32bit ARM, so disable it for now
cache_extra_args=
if [ -d "$PROFILES_CACHE_VAR" ] && [ "$pdir" = "$PROFILES_VAR" ]; then
cache_extra_args="-O no-expr-simplify"
fi
So now for machines with 2Gib of RAM and Snaps, Ubuntu 18.04 has become
unusable.
I know the minimum requirements are 4Gib but it did actually work fine with
2Gib before so it is a bit sad to loose that capability.
My suggestion is to just revert that change and do it in parser.conf
instead, so at least we have the option to easily modify it to retain
some 2Gib support.
Thanks a lot for considering this!!!
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https://bugs.launchpad.net/bugs/1830502
Title:
apparmor uses excessive memory leading to oom kill
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