Samsung laptops would fail to boot if the UEFI variable store was 100% full. The original solution to this in Linux was to leave at least 5K of free space. However, on several systems, removing UEFI variables didn't actually free up space - it was marked as free internally, but the reported amount of free space didn't increase, and so Linux would refuse to allow you to create new variables. The "solution" was to attempt to create a variable larger than the available free space, which forced the firmware to trigger a garbage collection run and re-synchronise the internal and external views of the amount of available free space. Doing something that we knew would fail was a requirement for avoiding killing laptops.