https://bugs.openldap.org/show_bug.cgi?id=10180

--- Comment #6 from Howard Chu <[email protected]> ---
After getting a copy of the DB file, I found

mdb_stat -efff shows that there are a couple of freelist entries with duplicate
page IDs.
Write txns using those freelist entries would certainly cause corruption.

mdb_dump -a seems to have no problem dumping the current data in the DB. As
such, you
could safely dump/load to recreate the DB without the freelist errors.

The last transaction ID was 69771 and the two bad freelist entries are from txn
69709 and
69710, respectively. Probably too far into the past to know what it was doing
at the time.

If you compile LMDB with -DMDB_DEBUG=3 it will do extensive auditing of the
freelist after
each transaction. Possibly we can use that to track down when the error
occurred, on a fresh run.

No idea how long it would take to reproduce this or what operations are needed
to reproduce it.

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