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Re: (ITS#8350) lmdb SIGBUS error on full partition and possible double free issue

> I'm not sure if this next one is an issue or just incorrect usage on my part.
> So take with a grain of salt.
> After getting an EIO (deliberate out of storage space) from a mdb_txn_commit,
> the transaction would be mdb_txn_abort()ed. I then would close then env which
> would get a SIGABORT from a double-free on the env_close0 with env->txn0.

The docs say quite clearly, after txn_commit the txn must not be used again. 
It has already been freed so you cannot use it with txn_abort.

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