https://bugs.openldap.org/show_bug.cgi?id=9037

--- Comment #27 from mdufour@audiokinetic.com --- We are also seeing rare instances of this crash since we released a version of our product which uses LMDB. Specifically, call stack is:

mdb_cursor_put(MDB_cursor * mc, MDB_val * key, MDB_val * data, unsigned int flags) Line 7998 mdb_put(MDB_txn * txn, unsigned int dbi, MDB_val * key, MDB_val * data, unsigned int flags) Line 10107

where line 8183 is

nsize = IS_LEAF2(mc->mc_pg[mc->mc_top]) ? key->mv_size : mdb_leaf_size(env, key, rdata);

and

mc->mc_top == 0 mc->mc_pg[0] == NULL rc == -30798

Although we do not have a reproduction case, we do have a full crash dump with heap of an unoptimized debug build of our application. There is no evidence of stack corruption (in fact, mc->mc_pg[1] is still 0xcccccccccccccccc as per the msvc run-time check initialization).

Unfortunately we do not have the matching LMDB file.

Anything we can provide to help narrow down the issue?