2018-04-30 16:54:47 140562482276096 [ERROR] InnoDB: Unable to read tablespace 913 page no 4 into the buffer pool after 100 attempts. The most probable cause of this error may be that the table has been corrupted. You can try to fix this problem by using innodb_force_recovery. Please see http://dev.mysql.com/doc/refman/5.6/en/ for more details. Aborting...

	buf_block_t* block = buf_page_try_get_func(space->id, offset, RW_X_LATCH,

						   true,

						   file, line, mtr);

	if (block != NULL) {

		/* page was in buffer pool */

		state->crypt_stat.pages_read_from_cache++;

		return block;

	}

	/* Before reading from tablespace we need to make sure that

	tablespace exists and is not is just being dropped. */

	if (space->is_stopping()) {

		return NULL;

	}

	state->crypt_stat.pages_read_from_disk++;

	ullint start = ut_time_us(NULL);

	block = buf_page_get_gen(space->id, zip_size, offset,

				 RW_X_LATCH,

				 NULL, BUF_GET_POSSIBLY_FREED,

				 file, line, mtr);

diff --git a/storage/innobase/buf/buf0buf.cc b/storage/innobase/buf/buf0buf.cc

index e3c2337659e..cd9f08b96e8 100644

--- a/storage/innobase/buf/buf0buf.cc

+++ b/storage/innobase/buf/buf0buf.cc

@@ -3189,6 +3189,11 @@ buf_page_get_gen(

 					      ibuf_inside(mtr));

 			retries = 0;

+		} else if (mode == BUF_GET_POSSIBLY_FREED) {

+			if (err) {

+				*err = local_err;

+			}

+			return NULL;

 		} else if (retries < BUF_PAGE_READ_MAX_RETRIES) {

 			++retries;

diff --git a/storage/innobase/lock/lock0lock.cc b/storage/innobase/lock/lock0lock.cc

index 12c0051d09f..441fcace7c3 100644

--- a/storage/innobase/lock/lock0lock.cc

+++ b/storage/innobase/lock/lock0lock.cc

@@ -6895,10 +6895,10 @@ lock_rec_block_validate(

 			page_no, RW_X_LATCH, NULL,

 			BUF_GET_POSSIBLY_FREED,

 			__FILE__, __LINE__, &mtr);

-

-		buf_block_dbg_add_level(block, SYNC_NO_ORDER_CHECK);

-

-		ut_ad(lock_rec_validate_page(block));

+		if (block) {

+			buf_block_dbg_add_level(block, SYNC_NO_ORDER_CHECK);

+			ut_ad(lock_rec_validate_page(block));

+		}

 		mtr_commit(&mtr);

 		fil_space_release(space);