I do not believe that hardened_malloc is the issue. Because our non rechunked images work fine. And hardened_malloc just enforces certain malloc related rules.
Describe the bug On the cosmic-main-hardened and cosmic-main-userns-hardened images (and probably nvidia images too), rpm-ostree can't write new deployments. Attempting to install or uninstall ...
You may need to wait until a new image is build to see the issue for yourself. If you rebase now you can not upgrade to a newer version. And the issue is only caused in rpm-ostree operations with hardened_malloc. You may not see any issue before the conditions are met. Conditions: rechunks + hardened_malloc + sys upgrade available
OK. You found the github thread. I posted a suggestion on how to change the malloc implementation at the top. Try the "light" variant. This may allow the rebase.