ITS#7377 Always notice env error on txn startup.

Move the check to the end of txn startup.  Catches env
breakage which happens while the new txn waits for a lock.

libraries/liblmdb/mdb.c

@@ -2681,12 +2681,16 @@ mdb_txn_renew0(MDB_txn *txn)
 	txn->mt_dbflags[MAIN_DBI] = DB_VALID|DB_USRVALID;
 	txn->mt_dbflags[FREE_DBI] = DB_VALID;
 
-	if (env->me_maxpg < txn->mt_next_pgno) {
+	if (env->me_flags & MDB_FATAL_ERROR) {
-		mdb_txn_end(txn, new_notls /*0 or MDB_END_SLOT*/ | MDB_END_FAIL_BEGIN);
+		DPUTS("environment had fatal error, must shutdown!");
-		return MDB_MAP_RESIZED;
+		rc = MDB_PANIC;
+	} else if (env->me_maxpg < txn->mt_next_pgno) {
+		rc = MDB_MAP_RESIZED;
+	} else {
+		return MDB_SUCCESS;
 	}
-
+	mdb_txn_end(txn, new_notls /*0 or MDB_END_SLOT*/ | MDB_END_FAIL_BEGIN);
-	return MDB_SUCCESS;
+	return rc;
 }
 
 int
@@ -2697,11 +2701,6 @@ mdb_txn_renew(MDB_txn *txn)
 	if (!txn || !F_ISSET(txn->mt_flags, MDB_TXN_RDONLY|MDB_TXN_FINISHED))
 		return EINVAL;
 
-	if (txn->mt_env->me_flags & MDB_FATAL_ERROR) {
-		DPUTS("environment had fatal error, must shutdown!");
-		return MDB_PANIC;
-	}
-
 	rc = mdb_txn_renew0(txn);
 	if (rc == MDB_SUCCESS) {
 		DPRINTF(("renew txn %"Z"u%c %p on mdbenv %p, root page %"Z"u",
@@ -2721,10 +2720,6 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
 	flags &= MDB_TXN_BEGIN_FLAGS;
 	flags |= env->me_flags & MDB_WRITEMAP;
 
-	if (env->me_flags & MDB_FATAL_ERROR) {
-		DPUTS("environment had fatal error, must shutdown!");
-		return MDB_PANIC;
-	}
 	if (env->me_flags & MDB_RDONLY & ~flags) /* write txn in RDONLY env */
 		return EACCES;