Cleanup batches inside the engine if they were not released explicitly before disconnection. This avoids a resource leak (it's mostly about TempSpace). (#8341)

Author: dyemanov

src/dsql/DsqlBatch.cpp

@@ -161,15 +161,20 @@ DsqlBatch::DsqlBatch(DsqlDmlRequest* req, const dsql_msg* /*message*/, IMessageM
 
 	// assign initial default BPB
 	setDefBpb(FB_NELEM(initBlobParameters), initBlobParameters);
-}
 
+	if (const auto att = m_dsqlRequest->req_dbb->dbb_attachment)
+		att->registerBatch(this);
+}
 
 DsqlBatch::~DsqlBatch()
 {
 	if (m_batch)
 		m_batch->resetHandle();
 	if (m_dsqlRequest)
-		m_dsqlRequest->req_batch = NULL;
+		m_dsqlRequest->req_batch = nullptr;
+
+	if (const auto att = m_dsqlRequest->req_dbb->dbb_attachment)
+		att->deregisterBatch(this);
 }
 
 Attachment* DsqlBatch::getAttachment() const

src/jrd/Attachment.cpp

@@ -47,6 +47,7 @@
 #include "../jrd/replication/Applier.h"
 #include "../jrd/replication/Manager.h"
 
+#include "../dsql/DsqlBatch.h"
 #include "../dsql/DsqlStatementCache.h"
 
 #include "../common/classes/fb_string.h"
@@ -287,9 +288,6 @@ Jrd::Attachment::~Attachment()
 
 	delete att_trace_manager;
 
-	for (unsigned n = 0; n < att_batches.getCount(); ++n)
-		att_batches[n]->resetHandle();
-
 	for (Function** iter = att_functions.begin(); iter < att_functions.end(); ++iter)
 	{
 		Function* const function = *iter;
@@ -448,6 +446,12 @@ void Jrd::Attachment::storeBinaryBlob(thread_db* tdbb, jrd_tra* transaction,
 	blob->BLB_close(tdbb);
 }
 
+void Jrd::Attachment::releaseBatches()
+{
+	while (att_batches.hasData())
+		delete att_batches.pop();
+}
+
 void Jrd::Attachment::releaseGTTs(thread_db* tdbb)
 {
 	if (!att_relations)

src/jrd/Attachment.h

@@ -729,6 +729,7 @@ class Attachment : public pool_alloc<type_att>
 	void storeBinaryBlob(thread_db* tdbb, jrd_tra* transaction, bid* blobId,
 		const Firebird::ByteChunk& chunk);
 
+	void releaseBatches();
 	void releaseGTTs(thread_db* tdbb);
 	void resetSession(thread_db* tdbb, jrd_tra** traHandle);
 
@@ -791,12 +792,12 @@ class Attachment : public pool_alloc<type_att>
 	}
 
 	// batches control
-	void registerBatch(JBatch* b)
+	void registerBatch(DsqlBatch* b)
 	{
 		att_batches.add(b);
 	}
 
-	void deregisterBatch(JBatch* b)
+	void deregisterBatch(DsqlBatch* b)
 	{
 		att_batches.findAndRemove(b);
 	}
@@ -859,7 +860,7 @@ class Attachment : public pool_alloc<type_att>
 	unsigned int att_stmt_timeout;		// milliseconds
 	Firebird::RefPtr<Firebird::TimerImpl> att_idle_timer;
 
-	Firebird::Array<JBatch*> att_batches;
+	Firebird::Array<DsqlBatch*> att_batches;
 	InitialOptions att_initial_options;	// Initial session options
 	DebugOptions att_debug_options;
 	Firebird::AutoPtr<ProfilerManager> att_profiler_manager;	// ProfilerManager

src/jrd/jrd.cpp

@@ -6039,7 +6039,6 @@ JBatch* JStatement::createBatch(Firebird::CheckStatusWrapper* status, Firebird::
 			batch = FB_NEW JBatch(dsqlBatch, this, inMetadata);
 			batch->addRef();
 			dsqlBatch->setInterfacePtr(batch);
-			tdbb->getAttachment()->registerBatch(batch);
 		}
 		catch (const Exception& ex)
 		{
@@ -6115,9 +6114,6 @@ void JBatch::freeEngineData(Firebird::CheckStatusWrapper* user_status)
 
 		try
 		{
-			Attachment* att = getAttachment()->getHandle();
-			if (att)
-				att->deregisterBatch(this);
 			delete batch;
 			batch = nullptr;
 		}
@@ -7691,6 +7687,8 @@ void release_attachment(thread_db* tdbb, Jrd::Attachment* attachment, XThreadEns
 	if (attachment->att_event_session)
 		dbb->eventManager()->deleteSession(attachment->att_event_session);
 
+	attachment->releaseBatches();
+
     // CMP_release() changes att_requests.
 	while (attachment->att_requests.hasData())
 		CMP_release(tdbb, attachment->att_requests.back());