(ITS#7607) Assertion triggers during many sequential transaction commits

[ilya.lukyanov@gmail.com]

Full_Name: Ilya Lukyanov
Version: 2.4.35
OS: Windows 7 x64
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (95.25.254.250)


I've built lmdb from source distribution of OpenLDAP 2.4.35 under Windows 7 x64
under Visual Studio 2012. All tests included into source distribution pass
successfully.

Then i'm executing my own test with code as follows:
https://gist.github.com/ilyalukyanov/5644971
And i'm allways get an asserion when executing near 32500-th mdb_txn_commit
(line 2231 - assert(oldpg_txnid <= env->me_pglast);)
I think this is a bug because if consider the scenario with separate usage of
LightningDB under high write-load scenario, 32k commits is not enough.