1# redo log from before MySQL 5.7.9
2# redo log from before MySQL 5.7.9, with corrupted log checkpoint
3# redo log from before MySQL 5.7.9, with corrupted log block
4# redo log from "after" MySQL 5.7.9, but with invalid header checksum
5# distant future redo log format, with valid header checksum
6# valid header, but old-format checkpoint blocks
7# valid header, valid checkpoint 1, all-zero (invalid) checkpoint 2, invalid block checksum
8# --innodb-force-recovery=6 (skip the entire redo log)
9# valid header, valid checkpoint 1, all-zero (invalid) checkpoint 2, invalid block number
10# --innodb-force-recovery=6 (skip the entire redo log)
11# Test a corrupted MLOG_FILE_NAME record.
12# valid header, valid checkpoint 1, all-zero (invalid) checkpoint 2
13# Test a corrupted MLOG_FILE_NAME record.
14# valid header, invalid checkpoint 1, valid checkpoint 2
15