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Re: (ITS#8443) segfault in lmdb following mdb_env_set_mapsize

gdochev@yahoo.com wrote:
> Full_Name: George Dochev
> Version:
> OS: Windows/OSX/Linux
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (2601:582:4500:e134:1d59:965c:aecc:5697)
> I updated from 0.9.15 to 0.9.18 and started getting intermittent segfaults in
> one of my unit tests. In my test when I issue mdb_txn_commit and get back
> MDB_MAP_FULL I abort the transaction,

You've misused the API. The txn has already been released by txn_commit, you 
cannot call abort on it at that point. This was already clearly spelled out in 
the docs for mdb_txn_commit.

Closing this ITS.

  expand the database through a call to
> mdb_env_set_mapsize and attempt a retry. In the retry I issue mdb_txn_begin
> again which is where I crash when it calls mdb_txn_renew0(MDB_txn *txn) with txn
> pointing to garbage.
> Some additional info which may or may not be relevant:
> The db size is 1MB aligned and there are no active transactions prior to the
> call to mdb_env_set_mapsize other than the one that I aborted as a result of the
> The environment was initially opened with  MDB_NOSYNC | MDB_WRITEMAP |
> The crash is intermittent but reproducible in all my configurations.
> Regards,
> George

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