Re: [syzbot] [bcachefs?] UBSAN: shift-out-of-bounds in __bch2_bkey_unpack_key

[Bharadwaj Raju]

The bad format is actually caught by
btree_err_on(bch2_bkey_format_invalid(c, &bn->format, write, &buf1),
...) in validate_bset,
but since the return from __btree_err matches BCH_err_fsck_fix, the
code doesn't really do anything about it.