Write out IByteBuffer before it is released (#6459)

src/Nethermind/Nethermind.TxPool/BlobTxStorage.cs

@@ -65,7 +65,7 @@ public void Add(Transaction transaction)
         Span<byte> txHashPrefixed = stackalloc byte[64];
         GetHashPrefixedByTimestamp(transaction.Timestamp, transaction.Hash, txHashPrefixed);
 
-        _fullBlobTxsDb.PutSpan(txHashPrefixed, EncodeTx(transaction));
+        EncodeAndSaveTx(transaction, _fullBlobTxsDb, txHashPrefixed);
         _lightBlobTxsDb.Set(transaction.Hash, LightTxDecoder.Encode(transaction));
     }
 
@@ -85,7 +85,7 @@ public void AddBlobTransactionsFromBlock(long blockNumber, IList<Transaction> bl
             return;
         }
 
-        _processedBlobTxsDb.Set(blockNumber, EncodeTxs(blockBlobTransactions));
+        EncodeAndSaveTxs(blockBlobTransactions, _processedBlobTxsDb, blockNumber);
     }
 
     public bool TryGetBlobTransactionsFromBlock(long blockNumber, out Transaction[]? blockBlobTransactions)
@@ -138,17 +138,17 @@ private static void GetHashPrefixedByTimestamp(UInt256 timestamp, ValueHash256 h
         hash.Bytes.CopyTo(txHashPrefixed[32..]);
     }
 
-    private Span<byte> EncodeTx(Transaction transaction)
+    private void EncodeAndSaveTx(Transaction transaction, IDb db, Span<byte> txHashPrefixed)
     {
         int length = _txDecoder.GetLength(transaction, RlpBehaviors.InMempoolForm);
         IByteBuffer byteBuffer = PooledByteBufferAllocator.Default.Buffer(length);
         using NettyRlpStream rlpStream = new(byteBuffer);
         rlpStream.Encode(transaction, RlpBehaviors.InMempoolForm);
 
-        return byteBuffer.AsSpan();
+        db.PutSpan(txHashPrefixed, byteBuffer.AsSpan());
     }
 
-    private byte[] EncodeTxs(IList<Transaction> blockBlobTransactions)
+    private void EncodeAndSaveTxs(IList<Transaction> blockBlobTransactions, IDb db, long blockNumber)
     {
         int contentLength = GetLength(blockBlobTransactions);
 
@@ -160,7 +160,7 @@ private byte[] EncodeTxs(IList<Transaction> blockBlobTransactions)
             _txDecoder.Encode(rlpStream, transaction, RlpBehaviors.InMempoolForm);
         }
 
-        return byteBuffer.Array;
+        db.Set(blockNumber, byteBuffer.Array);
     }
 
     private int GetLength(IList<Transaction> blockBlobTransactions)