Bug #23593654 CRASH IN BUF_BLOCK_FROM_AHI WHEN LARGE PAGES AND AHI ARE ENABLED

Problem:

Fix for Bug #21348684 (#Rb9581) introduced a conditional debug execute
'buf_pool_resize_chunk_null', which causes new chunks memory for 2nd
buffer pool instance is freed.

Buffer pool resize function removes all old chunks entry from
'buf_chunk_map_reg' and add new chunks entry into it. But when
'buf_pool_resize_chunk_null' is set true, 2nd buffer pool
instance's chunk entries are not added into 'buf_chunk_map_reg'.
When purge thread tries to access that buffer chunk, it leads to
debug assertion.

Fix:

Added old chunk entries into 'buf_chunk_map_reg' for 2nd buffer pool
instance when 'buf_pool_resize_chunk_null' debug condition is set to true.

Reviewed by: Jimmy <Jimmy.Yang@oracle.com>
RB: 18664

storage/innobase/buf/buf0buf.cc

 /*****************************************************************************
 
-Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 1995, 2018, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2008, Google Inc.
 Copyright (c) 2013, 2018, MariaDB Corporation.
 
@@ -2869,6 +2869,9 @@ buf_pool_resize()
 					= buf_pool->n_chunks;
 				warning = true;
 				buf_pool->chunks_old = NULL;
+				for (ulint j = 0; j < buf_pool->n_chunks_new; j++) {
+					buf_pool_register_chunk(&(buf_pool->chunks[j]));
+				}
 				goto calc_buf_pool_size;
 			}