hyc@symas.com wrote:

steven.lang@hgst.com wrote:

...

Full_Name: Steven Lang Version: LMDB 0.9.16 OS: Ubuntu 14.04 URL: ftp://ftp.openldap.org/incoming/steven-lang-150929.c Submission from: (NULL) (199.255.44.5)

While doing some testing using randomized key and data lengths and random puts and deletes, I found a situation in which mdb_cursor_del(...) followed by mdb_cursor_get(..., MDB_NEXT) causes an error:

mdb.c:5726: Assertion 'IS_LEAF(mp)' failed in mdb_cursor_next() Aborted

...

Attached is a program which fills a DB, then deletes keys until it asserts.

Thanks for the report. Our alternate approach to solve #8221 was to check the page fill factor including the (usually omitted) key #0 size; we didn't go that way because it was slightly more processing. But given this bug, it seems that's the only way to go.

Fixed now in git, thanks.