Merge fix for BUG#17446090 from mysql-5.1 to mysql-5.5

The testcase for this bug fails randomly due to two reasons.
1. Due to ibuf merge happening background
2. Due to dict stats update which brings the evicted page back into
   buffer pool.

Fix ibuf_contract_ext() to not do any merges with ibuf_debug enabled and
also changed dict_stats_update() to return fake statistics without
bringing the secondary index pages into buffer pool.

Approved by Marko. rb#3419

storage/innobase/dict/dict0dict.c

@@ -36,6 +36,11 @@ UNIV_INTERN dict_index_t*	dict_ind_redundant;
 /** dummy index for ROW_FORMAT=COMPACT supremum and infimum records */
 UNIV_INTERN dict_index_t*	dict_ind_compact;
 
+#if defined UNIV_DEBUG || defined UNIV_IBUF_DEBUG
+/** Flag to control insert buffer debugging. */
+UNIV_INTERN uint	ibuf_debug;
+#endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */
+
 #ifndef UNIV_HOTBACKUP
 #include "buf0buf.h"
 #include "data0type.h"
@@ -4520,6 +4525,12 @@ dict_update_statistics(
 			continue;
 		}
 
+#if defined UNIV_DEBUG || defined UNIV_IBUF_DEBUG
+		if (ibuf_debug && !dict_index_is_clust(index)) {
+			goto fake_statistics;
+		}
+#endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */
+
 		if (UNIV_LIKELY
 		    (srv_force_recovery < SRV_FORCE_NO_IBUF_MERGE
 		     || (srv_force_recovery < SRV_FORCE_NO_LOG_REDO

storage/innobase/ibuf/ibuf0ibuf.c

@@ -193,11 +193,6 @@ access order rules. */
 /** Operations that can currently be buffered. */
 UNIV_INTERN ibuf_use_t	ibuf_use		= IBUF_USE_ALL;
 
-#if defined UNIV_DEBUG || defined UNIV_IBUF_DEBUG
-/** Flag to control insert buffer debugging. */
-UNIV_INTERN uint	ibuf_debug;
-#endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */
-
 /** The insert buffer control structure */
 UNIV_INTERN ibuf_t*	ibuf			= NULL;
 
@@ -2649,6 +2644,12 @@ ibuf_contract_ext(
 		return(0);
 	}
 
+#if defined UNIV_DEBUG || defined UNIV_IBUF_DEBUG
+	if (ibuf_debug) {
+		return(0);
+	}
+#endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */
+
 	ibuf_mtr_start(&mtr);
 
 	/* Open a cursor to a randomly chosen leaf of the tree, at a random

storage/innobase/include/dict0types.h

@@ -63,4 +63,9 @@ typedef enum dict_err_ignore		dict_err_ignore_t;
 #define TEMP_TABLE_PREFIX                "#sql"
 #define TEMP_TABLE_PATH_PREFIX           "/" TEMP_TABLE_PREFIX
 
+#if defined UNIV_DEBUG || defined UNIV_IBUF_DEBUG
+/** Flag to control insert buffer debugging. */
+extern uint		ibuf_debug;
+#endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */
+
 #endif

storage/innobase/include/ibuf0ibuf.h

@@ -63,11 +63,6 @@ typedef enum {
 /** Operations that can currently be buffered. */
 extern ibuf_use_t	ibuf_use;
 
-#if defined UNIV_DEBUG || defined UNIV_IBUF_DEBUG
-/** Flag to control insert buffer debugging. */
-extern uint		ibuf_debug;
-#endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */
-
 /** The insert buffer control structure */
 extern ibuf_t*		ibuf;