Temporary fix for races while scanning partner concurrently. Synchronization should be re-implemented, single atomic flag is not enough.

Author: dyemanov

src/jrd/Relation.h

@@ -871,8 +871,9 @@ class RelationPermanent : public Firebird::PermanentStorage
 		return rel_indices.erase(tdbb, id);
 	}
 
-	Lock*		rel_partners_lock;		// partners lock
-	GCLock		rel_gc_lock;			// garbage collection lock
+	Firebird::Mutex rel_scan_partners_mutex;
+	Lock* rel_partners_lock;	// partners lock
+	GCLock rel_gc_lock;			// garbage collection lock
 
 	void releaseLock(thread_db* tdbb);
 

src/jrd/met.epp

@@ -4296,6 +4296,8 @@ void RelationPermanent::scanPartners(thread_db* tdbb)
 
 	Attachment* attachment = tdbb->getAttachment();
 
+	MutexLockGuard guard(rel_scan_partners_mutex, FB_FUNCTION);
+
 	if (rel_flags & REL_check_partners)
 	{
 		LCK_lock(tdbb, rel_partners_lock, LCK_SR, LCK_WAIT);