Must do dlist_free before releasing Wmutex

libraries/liblmdb/mdb.c

@@ -2801,6 +2801,10 @@ mdb_txn_reset0(MDB_txn *txn, const char *act)
 		env->me_pghead = NULL;
 		env->me_pglast = 0;
 
+		if (!(env->me_flags & MDB_WRITEMAP)) {
+			mdb_dlist_free(txn);
+		}
+
 		if (!txn->mt_parent) {
 			if (mdb_midl_shrink(&txn->mt_free_pgs))
 				env->me_free_pgs = txn->mt_free_pgs;
@@ -2813,9 +2817,6 @@ mdb_txn_reset0(MDB_txn *txn, const char *act)
 
 		mdb_cursors_close(txn, 0);
 
-		if (!(env->me_flags & MDB_WRITEMAP)) {
-			mdb_dlist_free(txn);
-		}
 		mdb_midl_free(pghead);
 
 		if (txn->mt_parent) {