Bug#16859867 INNODB_BUG14529666 FAILS SPORADICALLY IN VALGRIND

i_s_innodb_buffer_page_get_info(): Do not read the buffer block frame
contents of read-fixed blocks, because it may be invalid or
uninitialized. When we are going to decompress or read a block, we
will put it into buf_pool->page_hash and buf_pool->LRU, read-fix the
block and release the mutexes for the duration of the reading or
decompression.

rb#2500 approved by Jimmy Yang

storage/innobase/handler/i_s.cc

@@ -2890,6 +2890,16 @@ i_s_innodb_buffer_page_get_info(
 
 		page_info->freed_page_clock = bpage->freed_page_clock;
 
+		switch (buf_page_get_io_fix(bpage)) {
+		case BUF_IO_NONE:
+		case BUF_IO_WRITE:
+		case BUF_IO_PIN:
+			break;
+		case BUF_IO_READ:
+			page_info->page_type = I_S_PAGE_TYPE_UNKNOWN;
+			return;
+		}
+
 		if (page_info->page_state == BUF_BLOCK_FILE_PAGE) {
 			const buf_block_t*block;