On Thu, Oct 24, 2019 at 09:26:11 CEST, Carl-Daniel Hailfinger wrote: [...] > Can you try booting with the old installed kernel and initrd? Usually > those are kept for some time after an upgrade. You may also be able to get them from an archive. Most distros keep older versions arpound for a while. > Another thing I had to debug recently for a colleague was a failing > flash medium. There were no read errors, but single bits of the data had > flipped. I had that as well on an USB-stick. An exceptionally bad design that obviously did without the checksums that all well-designed storage has. > A unreported bit flip affecting the keyslots would be > catastrophic AFAICS. A single bit will kill the keyslot. If you know it is a single bit only, you can try with all bits flipped (around 1M tries taking around 2 weeks with 1 sec per try, i.e. all other keyslosts disabled), but if it is two bits, you are already pretty much screwed. > That said, bitflips affecting only the keyslots and > nothing else would be a strange beast unless this is a really crappy > SSD. How often do you reboot during normal operation? It could be a very small number of bits affected. Also, bit-flips in documents and even software often go unnoticed for a while. That is why you should allways do a full compare in backups. I found weak RAM bits, defective HDD connectors, etc. that way in the past. Regards, Arno -- Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@xxxxxxxxxxx GnuPG: ID: CB5D9718 FP: 12D6 C03B 1B30 33BB 13CF B774 E35C 5FA1 CB5D 9718 ---- A good decision is based on knowledge and not on numbers. -- Plato If it's in the news, don't worry about it. The very definition of "news" is "something that hardly ever happens." -- Bruce Schneier _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx https://www.saout.de/mailman/listinfo/dm-crypt
