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With new LUKS2 header format it is possible to use Argon2 key derivation function. This function is "memory-hard" hence keyslot unlocking can potentially use a lot of RAM as this increases resistance to massively parallel GPU based password cracking. However, when multiple systemd-cryptsetup binaries run at the same time it is very likely that system using Argon2 (e.g. Fedora 30) will encounter memory-pressure during early boot, following OOM killing spree. This patch aims to lower the damage done by OOM killer and sets OOMScore for systemd-cryptsetup units to 500. Hopefully OOM killer will then shoot us down and leave rest of the system services alone.
systemd - System and Service Manager
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