There is a lifetime management issue in PooledLDAPConnection::runFuncWithTimeout, see https://github.com/10gen/mongo-enterprise-modules/blob/master/src/ldap/connections/ldap_connection_factory.cpp#L221-L261. In this function, we access this but we do nothing to guarantee that this is alive when it is used. In the stack below, we see a call to a lambda in WrappedConnection::query::lambda but I could not find any stack in the process with a matching stack containing WrappedConnection::query. This implies that the query() call timed out and the connection was likely reaped why it was still being used.