------- Comment From [email protected] 2020-10-29 09:59 EDT------- With 2G, the crashkernel reservation will be 320K, which will not suffice to unlock the LUKS volume when processing kdump. The installation was done using 2G. Changing the VM size to 4+G will reserve 512K, and with this size kdump is working. I agree that 512K out of 2G is probably on the brink of too much.
As I said, a warning could be emitted that crashkernel < 512k will not allow to unlock a LUKS volume (at least if argon2i is used as PBKDF). Below is the luksDump output LUKS header information Version: 2 Epoch: 4 Metadata area: 16384 [bytes] Keyslots area: 16744448 [bytes] UUID: ac7595b4-0b0f-45ef-b745-c6f571876158 Label: (no label) Subsystem: (no subsystem) Flags: (no flags) Data segments: 0: crypt offset: 16777216 [bytes] length: (whole device) cipher: aes-xts-plain64 sector: 512 [bytes] Keyslots: 0: luks2 Key: 512 bits Priority: normal Cipher: aes-xts-plain64 Cipher key: 512 bits PBKDF: argon2i Time cost: 4 Memory: 270246 Threads: 1 Salt: 38 7f 60 45 c6 57 26 50 72 7a a7 e3 18 59 24 24 58 7a 9b 95 dd 87 3c 19 43 88 1e 5b 98 35 fd 3d AF stripes: 4000 AF hash: sha256 Area offset:32768 [bytes] Area length:258048 [bytes] Digest ID: 0 1: luks2 Key: 512 bits Priority: normal Cipher: aes-xts-plain64 Cipher key: 512 bits PBKDF: argon2i Time cost: 4 Memory: 235479 Threads: 1 Salt: 02 b8 0a f3 7e 0b 1c 23 77 9b 0e b0 19 c8 69 b4 bb 0c 3c 1e fd f9 24 7d 8a bf 6e 64 3b 17 79 31 AF stripes: 4000 AF hash: sha256 Area offset:290816 [bytes] Area length:258048 [bytes] Digest ID: 0 Tokens: Digests: 0: pbkdf2 Hash: sha256 Iterations: 142469 Salt: 62 73 02 e9 44 09 b0 44 0c 87 33 d4 8f 68 5e f7 3c f6 a5 68 5a 8f b6 2d a6 35 9c 02 9c ba c0 76 Digest: df 1a 9f 29 0e 2f 25 87 5f 11 11 c7 01 85 fd 2e e6 6a 98 65 bd b5 54 77 29 2d c5 b3 12 48 67 a1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1877533 Title: [20.10 FEAT] Increase the crashkernel setting if the root volume is luks2-encrypted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1877533/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
