(In reply to Jiri Slaby from comment #24) > Out of curiosity, could you boot several times: > https://github.com/jirislaby/collected_sources/tree/master/efi-dump-memattr As per PM, it output 6 times the same. I believe something corrupts the EFI memory. And it remains until cold booted. Given it is corrupted some later (the first boot is fine at this point), it might help to give KASAN a try. Could you try that: https://download.opensuse.org/repositories/home:/tiwai:/kernel:/stable-kasan/standard/x86_64/ ?