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(ITS#8419) mdb_env_stat crashes when the env argument hasn't been opened yet

Full_Name: Andrew Schorr
Version: lmdb 0.9.18
OS: Linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

I am implementing a gawk lmdb API. As a silly test, I ran the following code:

gawk -l lmdb '
   env = mdb_env_create()
   rc = mdb_env_stat(env, f)

It catches a SIGSEGV. It is apparently illegal to call mdb_env_stat before
calling mdb_open. Please consider updating the documentation or updating the
function to 
protect against this situation.