At "chunk_found" label I have:
addr: 0x10a981000
key->object_id: 0x100 (GRUB_BTRFS_OBJECT_ID_CHUNK)
key->type: 0xe4 (GRUB_BTRFS_ITEM_TYPE_CHUNK)
key->offset: 0x101c00000
chunk->type: 0x24 (GRUB_BTRFS_CHUNK_TYPE_DUPLICATED + 4)
chunk->size: 0x10000000
chunk->nstripes: 2
off = addr - grub_le_to_cpu64 (key->offset) = 0x10a981000 - 0x101c00000 =
0x8d81000
stripe_length = grub_divmod64 (grub_le_to_cpu64 (chunk->size),
grub_le_to_cpu16 (chunk->nstripes),
NULL) = 0x8000000
csize = stripe_length - off = 0x8000000 - 0x8d81000
csize will be negative => "couldn't find the chunk descriptor"
Hope this helps.
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https://bugs.launchpad.net/bugs/732149
Title:
[natty] btrfs "grub-probe: error: unknown filesystem"
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