Only synchronous disk reads should use thd_wait_begin with THD_WAIT_DISKIO

storage/xtradb/buf/buf0rea.c

@@ -182,7 +182,10 @@ not_to_recover:
 
 	ut_ad(buf_page_in_file(bpage));
 
-	thd_wait_begin(NULL, THD_WAIT_DISKIO);
+	if(sync) {
+		thd_wait_begin(NULL, THD_WAIT_DISKIO);
+	}
+
 	if (zip_size) {
 		*err = _fil_io(OS_FILE_READ | wake_later,
 			      sync, space, zip_size, offset, 0, zip_size,
@@ -194,7 +197,6 @@ not_to_recover:
 			      sync, space, 0, offset, 0, UNIV_PAGE_SIZE,
 			      ((buf_block_t*) bpage)->frame, bpage, trx);
 	}
-	thd_wait_end(NULL);
 
 	if (srv_pass_corrupt_table) {
 		if (*err != DB_SUCCESS) {
@@ -205,6 +207,7 @@ not_to_recover:
 	}
 
 	if (sync) {
+		thd_wait_end(NULL);
 		/* The i/o is already completed when we arrive from
 		fil_read */
 		buf_page_io_complete(bpage);