Bug#27331936 - RECOVERY FAILING WITH TABLESPACE ID: 1 = ['MYSQL.IBD', 'SYS/SYS_CONFIG.IBD'] ERR

Problem:
--------
Recovery cannot determine space_id properly and aborts

This is because we read tablespace flags from wrong offsets and
inturn we calculate wrong page size. With wrong page_size, all
bets are off.

Fix:
----
Read space flags from correct offset

Revewied-By: [email protected]
Approved on IM

Author: satya461

storage/innobase/fil/fil0fil.cc

@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1995, 2017, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 1995, 2018, Oracle and/or its affiliates. All Rights Reserved.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License, version 2.0, as published by the
@@ -11122,7 +11122,7 @@ Fil_system::get_tablespace_id(const std::string& filename)
 
 			/* Figure out the page size of the tablespace. If it's
 			a compressed tablespace. */
-			ifs.seekg(FSP_SPACE_FLAGS, ifs.beg);
+			ifs.seekg(FSP_HEADER_OFFSET + FSP_SPACE_FLAGS, ifs.beg);
 
 			if ((ifs.rdstate() & std::ifstream::eofbit) != 0
 			    || (ifs.rdstate() & std::ifstream::failbit) != 0