StorageStripeLog: avoid UB for rwlock unlock due to unlock from another thread

src/Storages/StorageStripeLog.cpp

@@ -228,6 +228,11 @@ public:
         storage.file_checker.save();
 
         done = true;
+
+        /// unlock should be done from the same thread as lock, and dtor may be
+        /// called from different thread, so it should be done here (at least in
+        /// case of no exceptions occurred)
+        lock.unlock();
     }
 
 private:

tests/queries/0_stateless/01797_StripeLog_rwlock_ub.sql

@@ -0,0 +1,5 @@
+DROP TABLE IF EXISTS underlying_01797;
+CREATE TABLE underlying_01797 (key UInt64) Engine=StripeLog();
+INSERT INTO FUNCTION remote('127.1', currentDatabase(), underlying_01797) SELECT toUInt64(number) FROM system.numbers LIMIT 1;
+SELECT * FROM underlying_01797 FORMAT Null;
+DROP TABLE underlying_01797;